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Journal articles on the topic 'Air conditioning – Noise'

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Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Zaporozhets, Oleksander I., and Vadim I. Tokarev. "Noise from airborne air conditioning system." Journal of the Acoustical Society of America 105, no. 2 (February 1999): 946. http://dx.doi.org/10.1121/1.425730.

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2

Huang, Xiao Bo, Jun Ye, Shu Sheng Xiong, Bin Tao Mao, Ying Hui Wang, Bao Sheng Guo, Ya Bo Sun, and Yu Fan Zhang. "Automotive Air Conditioning Compressor Noise Source Identification Method." Applied Mechanics and Materials 741 (March 2015): 397–400. http://dx.doi.org/10.4028/www.scientific.net/amm.741.397.

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With the improvement of requirements for vehicle comfort, people put forward higher requirements on the noise control of automotive air conditioning. As the power source of the automobile air conditioner, the compressor is also the main noise sources, so it is the major objective of vibration damping and noise reduction. In this paper, with analyzing the noise mechanism of compressor, introduces four identification methods of automotive air conditioning compressor noise source, providing theoretical basis for automobile air conditioning damping and noise reduction.

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3

Kühnel, Wolfram, Michael Paul, Norman Schaake, and Michael Schrumpf. "Noise reduction in vehicle air conditioning systems." ATZ worldwide 106, no. 12 (December 2004): 7–10. http://dx.doi.org/10.1007/bf03224702.

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4

Ji, Ming Hui, Ping Hu, Ji Li, and Yun Peng Cai. "Analysis of Car Interior Noise Induced by Refrigeration System in Air Conditioners." Advanced Materials Research 694-697 (May 2013): 366–69. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.366.

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Though the test of a certain domestic car which cause the car body vibration and cab noise under the idle with turning on and off air conditioning system. The result of the test is analyzed by sound pressure and vibration spectrum, which analysis spectrum-frequency characteristics, affecting factors and noise sources of noise.Finding out the main noise and vibration of interior noise caused by air conditioning and refrigeration system; the car dash panel and body wall is the main transmission route of cab vibration;the people feel uncomfortable when opening the air conditioning under idle, because beat frequency is caused by the compressor and engine. It provides a certain reference for the reduction of noise and vibration of car's air conditioning and refrigeration system.

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5

DOSHIDA, Suguru, Hayato YOSHINAGA, Gaku MINORIKAWA, and Tsunebumi MIKUNI. "Prediction of Flow Noise for Air Conditioning Duct." Proceedings of the Symposium on Environmental Engineering 2018.28 (2018): 112. http://dx.doi.org/10.1299/jsmeenv.2018.28.112.

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6

YOSHINAGA, Hayato, Suguru DOSHIDA, Gaku MINORIKAWA, and Tsunebumi MIKUNI. "Prediction of Flow Noise for Air Conditioning Duct." Proceedings of the Symposium on Environmental Engineering 2018.28 (2018): 113. http://dx.doi.org/10.1299/jsmeenv.2018.28.113.

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7

Susini, Patrick, Stephen McAdams, Suzanne Winsberg, Ivan Perry, Sandrine Vieillard, and Xavier Rodet. "Characterizing the sound quality of air-conditioning noise." Applied Acoustics 65, no. 8 (August 2004): 763–90. http://dx.doi.org/10.1016/j.apacoust.2004.02.003.

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8

Jeon, Jin Yong, Jin You, and Su Yeon Kim. "Subjective and objective evaluation of air‐conditioning noise." Journal of the Acoustical Society of America 119, no. 5 (May 2006): 3412. http://dx.doi.org/10.1121/1.4786796.

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9

Hamada, Hareo, Tanetoshi Miura, Minoru Takahashi, and Yoshitaka Oguri. "An adaptive noise control system in air‐conditioning ducts." Journal of the Acoustical Society of America 84, S1 (November 1988): S180. http://dx.doi.org/10.1121/1.2026004.

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10

Su, Jufeng, Yamin Sun, and Yuyang Liu. "Complexity Study on the Unsteady Flow Field and Aerodynamic Noise of High-Speed Railways on Bridges." Complexity 2018 (July 16, 2018): 1–16. http://dx.doi.org/10.1155/2018/7162731.

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To study complexity distributions of unsteady flow field and aerodynamic noise of a high-speed railway on bridges, an aerodynamic noise model of a railway was obtained. Meanwhile, detailed structures such as 6 bogies, 3 air conditioning units, 1 pantograph fairing, and 1 pantograph were considered. Numerical simulation was conducted to flow fields around the high-speed railway running on the bridge under a crosswind-free environment, with running speed of 350 km/h. Hence, unsteady flow behavior characteristics of the complete high-speed railway were obtained. Numerical simulation was conducted to noises of the railway on the bridge in combination with detached eddy simulation and acoustic analogy theory. Meanwhile, the broadband noise model was used for the quantitative analysis on distribution characteristics of the dipole noise source and quadrupole noise source of the high-speed railway on the bridge. Studied results proved that aerodynamic noise of the railway was caused by eddy shedding and fluid separation. Main noise sources of the high-speed railway include areas such as pantographs, train head streamline, bogies, windshield, and an air conditioning unit. Maximum sound pressure level and average sound pressure level of the high-speed railway on the bridge were 2.7 dBA and 2.3 dBA, respectively, more than those of the high-speed railway on a flat ground. On the bridge, the maximum sound pressure level of the pantograph on the bridge was 3.1 dBA larger than that on the flat ground. In addition, incoming flows of the high-speed railway on the bridge had greater impacts on aerodynamic noises around the railway compared with those of wake flows. Meanwhile, in directions of incoming flows and wake flows, linear relationship was between the sound pressure levels of noise monitoring points which had different distances from the train head nose and the logarithm of the distances.

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11

Shi, Wen Ku, Jian Peng Yao, Suo Jun Hou, Fu Xiang Guo, and De Guang Fang. "A Simulation on Aerodynamic Noise of an Air-Conditioning Duck." Advanced Materials Research 466-467 (February 2012): 778–83. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.778.

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The transient flow field is needed in order to predict the aerodynamic noise of an automotive HVAC duck by conventional methods. However, it is time-consuming when are several improved schemes .To solve the problem, schemes with large sound power can be discarded using Broadband Noise Source (BNS) model at first. Then, the best scheme can be found after the transient flow simulation .In this paper, an automotive HVAC duck is used as an example. Firstly BNS is used to predict which scheme is noisier, secondly the aerodynamic noise is computed using Fluent coupled with Sysnoise. At last they come to the same conclusion. The simulation results indicate BNS model can be used to find which scheme is the best without computing the transient flow field. So it can shorten the cycle of developing new products.

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12

Jeong, Un-Chang. "Classification of Refrigerant Flow Noise of Air Conditioners Based on Continuous Wavelet Transform and Support Vector Machine." Applied Sciences 10, no. 11 (June 7, 2020): 3959. http://dx.doi.org/10.3390/app10113959.

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This study proposes a classification method that uses the continuous wavelet transform and the support vector machine approach to classify refrigerant flow noises generated in an air conditioner. The air conditioning noise was identified as an abnormal signal by the use of the first- and second-order moments. The start and end times of refrigerant flow noises were identified by detecting the singularities of the continuous wavelet transform coefficient in the time domain and by means of listening to the measured sounds. Further, the time-frequency characteristics of refrigerant flow noise were analyzed with the continuous wavelet transform. For the support vector machine-based classification of refrigerant flow noise in an air conditioner, the grid search method was used to determine kernel hyperparameters. Five-fold cross validation was employed for the application of the support vector machine to the classification of air conditioner refrigerant noise. In addition, measured sound sources were modified based on classified refrigerant flow noise to compare the classification accuracy of a jury test with the results of the support vector machine.

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13

Fukaya, Shogo, and Chihiro Inatomi. "Improvement in Prediction Accuracy of Air Conditioning Noise from Vessels." Marine Engineering 55, no. 4 (July 1, 2020): 508–12. http://dx.doi.org/10.5988/jime.55.508.

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14

Takahashi, Minoru, Takashi Kuribayashi, Kinichiro Asami, Takashi Enokida, Hareo Hamada, and Tanetoshi Miura. "Broadband active sound control system for air-conditioning duct noise." Journal of the Acoustical Society of Japan (E) 8, no. 6 (1987): 263–69. http://dx.doi.org/10.1250/ast.8.263.

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15

Egana, Juan M., Javier Diaz, and Jordi Vinolas. "Active control of low-frequency broadband air-conditioning duct noise." Noise Control Engineering Journal 51, no. 5 (2003): 292. http://dx.doi.org/10.3397/1.2839725.

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16

Lauchle, Gerald C. "Flow noise in automotive heating, ventilation, and air conditioning systems." Journal of the Acoustical Society of America 99, no. 4 (April 1996): 2507–29. http://dx.doi.org/10.1121/1.415696.

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17

Jiricek, Ondrej, and Petr Konicek. "Active attenuation of fan noise in an air‐conditioning duct." Journal of the Acoustical Society of America 103, no. 5 (May 1998): 2836. http://dx.doi.org/10.1121/1.421395.

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18

Tian, Jian Hui, Bing Li, and Lian Jian. "The Research of Noise Characteristics on Shenzhen Metro Platform." Applied Mechanics and Materials 741 (March 2015): 426–30. http://dx.doi.org/10.4028/www.scientific.net/amm.741.426.

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The noise SPL and spectrum characteristics were tested and analyzed for the Shenzhen metro platform when the metro is inbound and outbound by using the noise and vibration measurement and analysis system. Time-domain SPL distribution diagrams shows, causing the largest noise level inside platform is mainly from the station radio, when no station radio, metro wheel-rail noise and air-conditioning fan noise have become a major SPL source in platform. The noise level at the platform is between 73dB-76dB. Frequency domain noise spectrum diagram shows, the noise SPL peak appeared in both low frequency and mid frequency ranges. Low frequency noise peak appears at 125Hz and 250Hz frequency band, mainly from the site of passengers talking and footsteps. Mid frequency noise peak is located in the 500Hz-1000Hz range, mainly from station radio, metro wheel-rail noise and air-conditioning fan and so on. This study provides a reference for noise reduction design of the metro platform.

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19

Solovyev, A. V., A. V. Smurov, and O. Ye Simakina. "VENTILATION AND AIR CONDITIONING SYSTEMS AS AIR NOISE SOURCES IN NAVY SHIPS AND BOATS." Marine Medicine 2, no. 2 (January 1, 2016): 56–65. http://dx.doi.org/10.22328/2413-5747-2016-2-2-56-65.

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20

Shu, Haiwen, Hongbin Wang, and Guangyu Cao. "Thermal and flow resistance characteristics of a parallel-pipe type natural heat transfer air-conditioning terminal device for nearly zero energy buildings." Indoor and Built Environment 29, no. 9 (May 22, 2020): 1227–37. http://dx.doi.org/10.1177/1420326x20926708.

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A nearly zero energy building (NZEB) can achieve significant energy saving by reducing its air-conditioning load greatly. At the same time, an NZEB should also achieve a comfortable thermal environment. In this paper, a parallel-pipe type natural heat transfer air-conditioning terminal device is proposed and studied for use in NZEB. The terminal device is able to provide both heating and cooling (including sensible and latent cooling) for a building without noise or air disturbance. The advantages of the terminal device have been demonstrated by comparing with other air-conditioning terminals. Experimental data of the heating and cooling performance of the device under different operation conditions were collected and analysed. The calculation models for the heating and cooling capacities of the device were obtained through data regression analysis, and the flow resistance curve of the device was obtained by means of experimental measurement under various flow rates. In addition, comparison was made on the heating and cooling capacities between the device and a radiant floor that also features little noise or air disturbance. Results show that the heating and cooling capacities of the device were 41.5% and 46.8% higher than the maximum capacities of the radiant floor, respectively. This research laid a foundation for the engineering application of the air-conditioning terminal device.

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21

Shi, Hui, Wenku Shi, Liang Sun, and Zhiyong Chen. "Improving Camper Comfort by Optimizing the Vibration Isolation of Air-Conditioning Compressor." Mathematical Problems in Engineering 2020 (December 23, 2020): 1–14. http://dx.doi.org/10.1155/2020/2958604.

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Compressors are the main excitation source of vibration and noise in camper air-conditioning systems, which directly affects the NVH characteristics in campers. The vibration and noise reduction for camper comfort improvement can be implemented by the optimization method. This paper presents vibration and noise improvement in camper by systematically optimizing the vibration isolation performance of air-conditioning compressor. To analyze the compressor vibration characteristics, operational vibration tests under different conditions and modal identification are implemented. Based on the analysis results, a genetic algorithm is used to optimize the stiffness of the compressor vibration isolation element by the energy decoupling method (EDM). The stiffness, natural frequencies, and energy decoupling rate (EDR) of the compressor vibration isolation system (CVIS) are compared between preoptimization and postoptimization. The stiffness and strength characteristics of the optimized isolation system are verified by the finite element method. Operational vibration and noise tests of a camper are performed to validate the optimization effect. The improvement of camper comfort demonstrates that the proposed optimization procedure of CVIS is effective.

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22

Tian, Yu Lan, and Wen Yan Zhang. "Study on Air Conditioning System Design Method of Recreational Guild Hall Based on Architecture Environment Requirement." Advanced Materials Research 243-249 (May 2011): 4983–87. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4983.

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Recreational guild hall usually has the characteristic of the special architectural form, complex architectural adornment and high requirement of indoor temperature/humidity, airflow distribution, noise and lighting. Air conditioning system design was optimized based on architecture environment requirement of recreational guild hall. The method was applied on the air conditioning system design of Nanjing Longjing recreational guild hall and the effect is satisfactory.

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23

Sanders, Philip, and Peter Rumsey. "Noise and energy consumption in heating, ventilation and air conditioning systems." Journal of the Acoustical Society of America 126, no. 4 (2009): 2179. http://dx.doi.org/10.1121/1.3248516.

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24

董, 立国. "Noise Analysis and Resonant Absorber Design of Central Air Conditioning Room." Open Journal of Acoustics and Vibration 05, no. 02 (2017): 13–18. http://dx.doi.org/10.12677/ojav.2017.52003.

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25

Herrin, David W., and Kangping Ruan. "Simulation of noise propagation through heating ventilation and air conditioning ductwork." Journal of the Acoustical Society of America 139, no. 4 (April 2016): 2060. http://dx.doi.org/10.1121/1.4950103.

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26

KAWASAKI, Ryo, Kazuyuki YAMAMOTO, Koji MASUMOTO, and Masaharu NISHIMURA. "108 Noise and Vibration Analysis of Compressor for Air-Conditioning Machine." Proceedings of the Dynamics & Design Conference 2010 (2010): _108–1_—_108–6_. http://dx.doi.org/10.1299/jsmedmc.2010._108-1_.

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27

Choy, Y. S., K. T. Lau, C. Wang, C. W. Chau, Y. Liu, and D. Hui. "Composite panels for reducing noise in air conditioning and ventilation systems." Composites Part B: Engineering 40, no. 4 (June 2009): 259–66. http://dx.doi.org/10.1016/j.compositesb.2009.01.004.

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28

Ávila Ferreira, Vinícius. "Soundproof Window - Natural Ventilation." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (August 1, 2021): 3294–304. http://dx.doi.org/10.3397/in-2021-2361.

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Expansion of brasilians cities worsen noise pollution in these places, forcing people to maintain their doors and windows closed. Domestic environment enclosing lead to necessity of air conditioning system, however the frequent use of the equipment may cause many health problems, such as respiratory difficulties and spread of diseases , not to mention high costs with energy. Considering these facts, there is the need of soundproofing windows with air supply , that allows passage of air without noise passage, guarantee a well-ventilated environment, with thermic and acoustic comfort without the use of acclimatisation systems . we have developed two prototypes with significant opening that allows air supply (passage) (0,35m2) and noise reduction (Rw+Ctr) reaching 8 to 10 dB. In the first study, we considered people inhabiting really noisy surrounding areas, who has already installed a regular window. In this particular case, we developed a soundproofing window air supply that can be installed over the existing one. A second study considered new constructions to focus the environment where the person sleeps and then elaborate a soundproofing window air supply for bedrooms.

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29

Li, Kang, Hao Gao, Peng Jia, Lin Su, Yidong Fang, Hua Zhang, and Ni Liu. "Numerical and experimental investigation on the air flow characteristics of heating, ventilation, and air-conditioning module for a small electric vehicle." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 234, no. 6 (December 24, 2019): 1597–609. http://dx.doi.org/10.1177/0954407019895148.

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In electrical vehicles, replacing positive temperature coefficient heater as heat source with an air source heat pump could improve the driving range and decrease energy consumption in cold climate. Design of the heating, ventilation, and air-conditioning module for heat pump system has a significant influence on its performance in each working mode. A newly designed heat pump heating, ventilation, and air-conditioning module was introduced in this paper. The air flow characteristics of the heat pump heating, ventilation, and air-conditioning module in four working modes were analyzed, and the air flow rate and wind resistance were obtained by numerical simulation. Experiments were also conducted for validating its airflow rate in each working mode. Results of these experiments show that some unfavorable phenomena such as flow maldistribution and vortex inside the heat pump heating, ventilation, and air-conditioning module exist, which could lead to insufficient utilization of the heat exchange area of heat exchangers and the generation of aerodynamic noise. Furthermore, the air flow rate of the original heating, ventilation, and air-conditioning module was also measured for comparison, and the designed heat pump heating, ventilation, and air-conditioning module shows nearly 15–20% decrease in each working mode.

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30

Zhang, Xueyong, Yuanyuan Hu, Shengyuan Geng, Qianyong Hu, and Huanbao Wang. "Research on Noise Reduction Scheme of Heat Pump Unit in a Square." Journal of Chemistry 2020 (March 9, 2020): 1–6. http://dx.doi.org/10.1155/2020/1237034.

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Heat pump unit is a host device located in the central air-conditioning terminal, providing cold and hot water. Heat pump unit has the advantages of energy saving, environmental protection, easy maintenance, and so on. It is adopted to solve the problems of refrigeration and heating in ventilation and air conditioning from many engineering projects in China. When the equipment is turned on, however, the high noise generated by the heat pump unit has a very negative impact on the life and work of the surrounding residents. Therefore, noise reduction is needed to improve the environment quality. In this paper, the noise of the air-cooled heat pump unit of the square area in Shanghai was detected, the noise source was analyzed, and the corresponding noise reduction scheme was proposed. After the completion of the scheme, measurements indicate that A-weighted sound pressure level is less than or equal to 60 dB (A) during the day and less than or equal to 50 dB (A) at night, which meets the relevant national noise limit emission standards and conforms to the second-class quality standard of the acoustic environment.

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31

Aksenov, A. A., V. N. Gavrilyuk, and S. F. Timushev. "Numerical simulation of tonal fan noise of computers and air conditioning systems." Acoustical Physics 62, no. 4 (July 2016): 447–55. http://dx.doi.org/10.1134/s1063771016040011.

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32

Han, Hyung Suk, Jin Yong Mo, Chang Hyun Kim, Jae Kwon Lee, and Weui Bong Jeong. "Electrical and structural design of air-conditioning fan motor for noise reduction." Journal of Mechanical Science and Technology 20, no. 10 (October 2006): 1653–61. http://dx.doi.org/10.1007/bf02916269.

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33

Ruan, Xiaolong, and Yisong Yin. "Analysis of Common Problems of Noise and Vibration in Building Heating Ventilation Air Conditioning Design." E3S Web of Conferences 283 (2021): 01051. http://dx.doi.org/10.1051/e3sconf/202128301051.

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With the continuous growth of my country's economy and the continuous improvement of the people's economic level, the demand for the design of heating, ventilation and air conditioning systems has also increased. The HVAC system is very important in the building environment. When optimizing the relevant design, it is necessary to always consider the design details of the HVAC system and adjust the integrity of the design, especially to take preventive measures in areas where noise and vibration may occur to avoid heating serious problems caused by noise and general vibration when the communication system is running. This article outlines how to avoid and control common noise and vibration problems when designing HVAC projects.

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34

Li, Lian You, Yong Jiang Shi, and Dan Li. "Establishment and Analysis of Fault Model for the Central Air-Conditioning System." Advanced Materials Research 505 (April 2012): 112–15. http://dx.doi.org/10.4028/www.scientific.net/amr.505.112.

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This paper analyzes the dynamic fault information (temperature, pressure, flow, noise, vibration etc.) in the process of operation of the air-conditioning system and establishes the simplified qualitative physical model which takes the surface air cooler as an example, and then writes out the mathematical model according to the simplified model. Finally, the paper gets some conclusions or conjecture suitable for the material object according to the research of the mathematical model.

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35

Thorburn, Steven. "Heating, ventilation, and air conditioning noise calculations after the slide rule and calculator." Journal of the Acoustical Society of America 139, no. 4 (April 2016): 2058. http://dx.doi.org/10.1121/1.4950092.

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36

Lee, Joonhee, and Lily M. Wang. "How audible tones affect psychoacoustic perception of heating, ventilation, and air conditioning noise." Journal of the Acoustical Society of America 139, no. 4 (April 2016): 2058. http://dx.doi.org/10.1121/1.4950096.

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37

Yang, Zhen-dong, Zheng-qi Gu, Yi-ping Wang, Jian-rong Yan, and Xiao-tao Yang. "Prediction and optimization of aerodynamic noise in an automotive air conditioning centrifugal fan." Journal of Central South University 20, no. 5 (May 2013): 1245–53. http://dx.doi.org/10.1007/s11771-013-1608-6.

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38

Storm, Mark. "Air-cooled chiller screening noise analysis with preliminary building project information." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5038–46. http://dx.doi.org/10.3397/in-2021-2939.

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For Inter-noise 2018, the author submitted a paper proposing techniques to derive reasonable preliminary estimates of building project stationary noise emission levels from sparse but available data that may seem unrelated to noise or vibration such as gross square footage (GSF), expected occupancy, and land use or function. Results from these predictions would be used to support or refine established buffer distances between exposed outdoor heating, ventilating, and air-conditioning (HVAC) system noise sources and nearby noise-sensitive receptors, helping planners tasked with ambitious infill or growth goals better fit building projects into complicated campus development puzzles. This paper provides supplemental guidance by linking the same preliminary building project GSF, occupancy, and function information to estimates of cooling load (expressed as refrigeration tonnage) and thus an additional HVAC consideration not discussed in the author's previous study. When such refrigeration relies upon air-cooled condensers installed outdoors on building rooftops or at grade, substantial noise sources are introduced to the environment. Thus, this new study shares data and methodology to help expand the value and utility of the previous work and potentially provide more comprehensive building HVAC noise estimates for use by building developers and planners.

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39

Ye, Kan, Jinchen Ji, and Sam Han. "Semi-active noise control for a hermetic digital scroll compressor." Journal of Low Frequency Noise, Vibration and Active Control 39, no. 4 (July 31, 2019): 1204–15. http://dx.doi.org/10.1177/1461348419867019.

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Hermetic digital scroll compressor has been widely used as a small-scale organic Rankine cycle application in the heating, ventilation, and air conditioning systems. A clunking noise issue is recently found in an air conditioning outdoor unit, and the main cause of the noise is experimentally identified to be the impact of the scrolls in the compressor unit during the switching process. The semi-active control methods are thus designed to greatly reduce the noise level by using additional valves to adjust the pressure changing rate within the modulation chamber. The response time for the impact of the scrolls can then be controlled by the added valves. The additional release valve with a smaller diameter pipe parallel to the main valve is tested firstly for its performance. Slower flow rate is produced and the pipe can extend the response time and decrease the speed of the impact process by reducing the pressure changing rate. The use of a discharge valve is also tested for controlling the pressure changing rate inside the chamber. The discharge valve with an opposite effect to the release valve is found useful for solving the noise issue. Both noise and vibration results confirm that the impact noise in the frequency range of interest can be reduced by using the proposed semi-active control methods.

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40

Park, Se Min, Seo-Yoon Ryu, Cheolung Cheong, Jong Wook Kim, Byung Il Park, Young-Chull Ahn, and Sai Kee Oh. "Optimization of the Orifice Shape of Cooling Fan Units for High Flow Rate and Low-Level Noise in Outdoor Air Conditioning Units." Applied Sciences 9, no. 23 (November 29, 2019): 5207. http://dx.doi.org/10.3390/app9235207.

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Demand for air conditioners is steadily increasing due to global warming and improved living standards. The noise, as well as the performance of air conditioners, are recognized as one of the crucial factors that determine the air conditioners’ values. The performance and noise of the air conditioner are mostly determined by those of its outdoor unit, which in turn depend on those of the cooling fan unit. Therefore, a cooling fan unit of high-performance and low noise is essential for air-conditioner manufacturers and developers. In this paper, the flow performance and flow noise of the entire outdoor unit with an axial cooling fan in a split-type air-conditioner were investigated. First, a virtual fan tester constructed by using about 18 million grids is developed for highly resolved flow simulation. The unsteady Reynolds-Averaged Navier–Stokes equations are numerically solved by using finite-volume computational fluid dynamics techniques. To verify the validity of the numerical analysis, the predicted P–Q curve of the cooling fan in a full outdoor unit is compared with the measured one. There was an excellent agreement between the two curves. The further detailed analysis identifies the coherent vortex structures between the fan blade tip and fan orifice, which adversely affect the flow performance and causes flow noise. Based on this analysis, the optimization of fan orifice was carried out using the response surface method with three geometric parameters: inlet radius, neck length, and outlet angel of the orifice. The optimum layout for the high flow rate is proposed under the understanding that the increased flow rate can be converted to noise reduction. The additional computation using the proposed optimum orifice shows that the flow rate is increased by 4.6% at the operating point. Finally, the engineering sample was manufactured by using the optimum design, and the measured data confirmed that the flow rate were increased by 2.1%, the noise reduction was made by 2.8 dBA, and the power consumption is reduced by 4.0% at the operating rotational speed.

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41

Gharsellaoui, Sondes, Majdi Mansouri, Shady S. Refaat, Haitham Abu-Rub, and Hassani Messaoud. "Multivariate Features Extraction and Effective Decision Making Using Machine Learning Approaches." Energies 13, no. 3 (January 31, 2020): 609. http://dx.doi.org/10.3390/en13030609.

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Fault Detection and Isolation (FDI) in Heating, Ventilation, and Air Conditioning (HVAC) systems is an important approach to guarantee the human safety of these systems. Therefore, the implementation of a FDI framework is required to reduce the energy needs for buildings and improving indoor environment quality. The main goal of this paper is to merge the benefits of multiscale representation, Principal Component Analysis (PCA), and Machine Learning (ML) classifiers to improve the efficiency of the detection and isolation of Air Conditioning (AC) systems. First, the multivariate statistical features extraction and selection is achieved using the PCA method. Then, the multiscale representation is applied to separate feature from noise and approximately decorrelate autocorrelation between available measurements. Third, the extracted and selected features are introduced to several machine learning classifiers for fault classification purposes. The effectiveness and higher classification accuracy of the developed Multiscale PCA (MSPCA)-based ML technique is demonstrated using two examples: synthetic data and simulated data extracted from Air Conditioning systems.

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Chaczko, Zenon, Shahrzad Aslanzadeh, and Jonathan Kuleff. "The Artificial Immune System Approach for Smart Air-Conditioning Control." International Journal of Electronics and Telecommunications 58, no. 2 (June 1, 2012): 193–99. http://dx.doi.org/10.2478/v10177-012-0027-1.

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The Artificial Immune System Approach for Smart Air-Conditioning ControlBiologically inspired computing that looks to nature and biology for inspiration is a revolutionary change to our thinking about solving complex computational problems. It looks into nature and biology for inspiration rather than conventional approaches. The Human Immune System with its complex structure and the capability of performing pattern recognition, self-learning, immune-memory, generation of diversity, noise tolerance, variability, distributed detection and optimisation - is one area that has been of strong interest and inspiration for the last decade. An air conditioning system is one example where immune principles can be applied. This paper describes new computational technique called Artificial Immune System that is based on immune principles and refined for solving engineering problems. The presented system solution applies AIS algorithms to monitor environmental variables in order to determine how best to reach the desired temperature, learn usage patterns and predict usage needs. The aim of this paper is to explore the AIS-based artificial intelligence approach and its impact on energy efficiency. It will examine, if AIS algorithms can be integrated within a Smart Air Conditioning System as well as analyse the impact of such a solution.

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Li, Xu Quan, Dong Dong Dong, Min Jie Gu, Gang Wang, and Song Tao Hu. "Study on the Flow Characteristics of the Monolithic Muffler in Train Air Conditioning Duct." Advanced Materials Research 462 (February 2012): 300–306. http://dx.doi.org/10.4028/www.scientific.net/amr.462.300.

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After installing the monolithic muffler in the train air duct, noise is reduced, but meanwhile also increased the air duct resistance. In this paper, a monolithic muffler simulation calculation model is introduced in this paper. The pressure loss and internal flow field of the muffler are obtained by. CFD simulation. Experimental results validate the simulation method. It provides a basis for the silencer performance research of muffler.

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Yamauchi, Katsuya, Minori Dan, Federico Cioffi, Luigi Maffei, and Massimiliano Masullo. "Perceptual Difference on HVAC Sound Quality between Electric and Conventional Vehicles." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4189–98. http://dx.doi.org/10.3397/in-2021-2629.

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The heating, ventilation and air-conditioning (HVAC) system is one of the most critical sources in in-vehicle noise environment, especially when cars are moving at low speed or at lower engine rotation. With the transition to electric vehicles (EV) from internal combustion engine vehicles (ICEV), the contribution of powertrain becomes lower on the background noise inside car cabins. The authors have been conducting a collaborative research on HVAC sound quality inside car cabins. In this paper the results of a subjective evaluation of HVAC sound quality were presented, that attempted to compare the perceptual differences among the two groups, i.e. EVs and ICEVs. The result revealed the difference in the noise perception among the two types of vehicles especially softer air flow rate conditions.

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Ochi, Kimikazu. "Heating Ventilation and Air Conditioning System for Code on Noise Levels on Board Ships." Journal of The Japan Institute of Marine Engineering 50, no. 6 (2015): 820–23. http://dx.doi.org/10.5988/jime.50.820.

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Eichelberger, Curtis, James E. Bender, Paul F. Bauch, and Jarom H. Giraud. "Tonal noise in heating, ventilation, and air-conditioning equipment in commercial and residential buildings." Journal of the Acoustical Society of America 137, no. 4 (April 2015): 2319. http://dx.doi.org/10.1121/1.4920463.

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Miller, Andrew N. "Heating, ventilating, and air conditioning systems noise and electronic sound masking systems in buildings." Journal of the Acoustical Society of America 139, no. 4 (April 2016): 2057. http://dx.doi.org/10.1121/1.4950091.

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Zhang, Chi, Angui Li, Jiaxing Li, Yicun Hou, and Xing Chen. "Radiation noise control of a 90° rectangular elbow in ventilation and air conditioning systems." Journal of Building Engineering 37 (May 2021): 102157. http://dx.doi.org/10.1016/j.jobe.2021.102157.

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SHIMOGAWA, Daiki, Yuma NISHIKIDO, and Fujio AKAGI. "Reduction of Aeroacoustics Noise Generated from Air Conditioning Flow Control Vane by Small Devices." Proceedings of Conference of Kyushu Branch 2021.74 (2021): A23. http://dx.doi.org/10.1299/jsmekyushu.2021.74.a23.

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Liu, Jia Xing, Xu Ji, Ming Li, Xiang Bo Song, and Qi Chao Zhang. "Simple Analysis Solar Solid Adsorption Refrigeration in the Application of Central Air Conditioning." Advanced Materials Research 1092-1093 (March 2015): 87–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.87.

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Advantage of solid adsorption refrigeration is environmental protection, energy saving, simple structure, no noise and the advantages of stable and reliable operation, the use of solar energy driven refrigeration is an energy-saving environmental protection technology, it can effectively reduce the huge energy consumption and environmental pollution due to the burning of fossil energy resources. This article introduces the general situation of development of solar adsorption refrigeration, puts forward the research progress and application prospect of the solar energy air conditioning system.

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