Дисертації з теми "Low head pumps"
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Toal, B. R. H. "The application of heat pumps to low temperature drying." Thesis, University of Ulster, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378669.
Повний текст джерелаVivian, Jacopo. "Direct Use of Low Temperature Heat in District Heating Networks with Booster Heat Pumps." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3422669.
Повний текст джерелаGli edifici sono responsabili di oltre un terzo della domanda di energia in Europa. Ridurre il consumo di energia, aumentare l’efficienza energetica ed integrare fonti di energia a basso impatto ambientale sono diventati obiettivi fondamentali nella transizione verso un futuro sostenibile. Le reti di teleriscaldamento e teleraffrescamento hanno un ruolo fondamen-tale nel raggiungimento di questi obiettivi, in quanto permettono di recuperare ed utilizzare il calore da qualsiasi fonte sia disponibile a livello locale: dal calore di scarto al calore di fonti rinnovabili come il geotermico e il solare. Oggi le reti di teleriscaldamento più efficienti hanno temperature di mandata pari a circa 70°C in inverno e 55°C d’estate. A causa della loro struttura centralizzata, le reti di oggi non sono predisposte per la generazione distribuita del calore. Questa tesi analizza il potenziale di una nuova generazione di reti, che distribuiscono il calore ad una temperatura più bassa (in generale tra 15°C e 45°C) e usano pompe di calore di rilancio nelle sottostazioni d’utenza per fornire calore alla temperatura desiderata da ogni sin-golo edificio. Questa nuova filosofia progettuale porta diversi benefici rispetto alle reti tradi-zionali, come l’abbattimento delle perdite di calore, la possibilità di integrare fonti a più bassa temperatura e la decentralizzazione del sistema. In una analisi preliminare, l’implementazione del sistema proposto è stata studiata per una cittadina italiana in cui è presente un’ingente quantità di acqua di risulta tra i 45°C e i 55°C. In questo caso studio, la rete di teleriscalda-mento con le pompe di calore distribuite riduce il consumo di energia primaria e le emissioni di anidride carbonica di circa il 70% rispetto allo sceanrio costituito da caldaie autonome e del 30% rispetto ad una rete tradizionale con pompa di calore centralizzata e caldaia a gas di inte-grazione. Questo miglioramento si verifica anche perché ogni pompa di calore viene adattata all’edificio, il che assume notevole importanza in virtù dell’eterogeneità del parco edilizio normalmente presente nel contesto urbano. La progettazione e la gestione di questo tipo di reti è un argomento nuovo nella letteratura scientifica. La prima parte della Tesi cerca perciò di rispondere ad una domanda di carattere generale: “Quali sono gli aspetti più importanti nella progettazione del sistema?” La tesi analizza gli effetti di alcuni parametri di progetto sul costo dell’energia all’utente fina-le, mantenendo fisso il tempo di rientro dell’utility. Ne è emerso che una elevata temperatura di mandata porta a due benefici: (a) aumentano le vendite di calore da parte dell’utility e (b) si riduce il consumo di energia elettrica delle pompe di calore. Come conseguenza, passando da 40°C a 20°C ato dell’energia si abbassa del 17% a parità di costo del calore che alimenta la rete. In più, anche la differenza di temperatura tra mandata e ritorno ha un ruolo importante nella fase di progetto della rete. Il compromesso che nasce per contenere da un lato l’investimento iniziale e dall’altro i costi operativi può portare ad una differenza di temperatu-ra ottimale tra mandata e ritorno. La struttura decentralizzata di queste reti inoltre fa nascere la necessità di studiare nuove strategie di controllo. Infatti, se l’utility compra e/o produce l’energia elettrica di cui le pompe di calore necessitano, la strategia di controllo deve tenere in considerazione anche il prezzo e/o il costo di produzione dell’energia elettrica. Inoltre, il si-stema di controllo del gestore della rete deve essere in grado di far fronte a quantità ingenti di calore fornito dai prosumers. Questi problemi possono essere riassunti nel seguente quesito: “In che modo il gestore di rete può controllare i suoi impianti?” Questa parte della tesi è stata sviluppata nell’ambito del progetto H2020 FLEXYNETS. Al fine di minimizzare il costo operativo per il gestore di rete è stato sviluppato e successivamente testato attraverso simulazioni un metodo di controllo intelligente basato su ottimizzazione MILP. Col metodo proposto il sistema è stato in grado di adattarsi alla situazione di domanda di calore, disponibilità di energia da parte dei prosumers e prezzo dell’elettricità in modo tale da aumentare la quota di autoconsumo e aumentare la quota di energia recuperata dai prosu-mers. Durante i due mesi di simulazione, la strategia di controllo è stata in grado di ridurre i costi operativi dell’11% rispetto ad un sistema di controllo convenzionale. Lo schema “rece-ding horizon” rende il metodo potenzialmente fruibile in applicazioni real-time. Il contributo della tesi non è solamente relativo ai risultati in quanto tali, ma anche alla metodologia utiliz-zata per raggiungerli. Infatti i modelli sviluppati hanno permesso di studiare il sistema energe-tico nel suo insieme.
Mateu, Royo Carlos. "Development of High Temperature Heat Pumps for Industrial Waste Heat Recovery." Doctoral thesis, Universitat Jaume I, 2021. http://dx.doi.org/10.6035/14107.2021.744033.
Повний текст джерелаUno de los mayores desafíos de esta década recae en el desarrollo de sistemas energéticos más sostenibles que contribuyan a la preocupación medioambiental, especialmente la mitigación del cambio climático. Extender las condiciones de funcionamiento de la tecnología de bomba de calor a temperaturas más elevadas permitirá descarbonizar el sector industrial desde dos vertientes: recuperando calor de fuentes de calor residual, actualmente disipado al ambiente y producir calor a los niveles térmicos requeridos, útiles para los procesos industriales, reduciendo así las emisiones de CO2 equivalentes del sector industrial y contribuyendo al desarrollo sostenible. Esta tesis pretende abordar el desarrollo de bombas de calor de alta temperatura a través de un análisis teórico y experimental, para abordar diferentes desafíos tecnológicos: arquitectura, refrigerantes, prototipo experimental, aplicaciones avanzadas e integración de sistemas, generando nuevos conocimientos que representan un paso adelante en la tecnología de bombas de calor de alta temperatura.
Programa de Doctorat en Tecnologies Industrials i Materials
Mempouo, B. "Investigations of novel heat pump systems for low carbon homes." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12043/.
Повний текст джерелаZubair, Syed M. "Solar assisted heat pump : a thermoeconomic design based on second law." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/17573.
Повний текст джерелаThygesen, Richard. "Low energy buildings equipped with heat pumps for high self-consumption of photovoltaic electricity." Doctoral thesis, Mälardalens högskola, Framtidens energi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-31314.
Повний текст джерелаNavarro, Espinosa Alejandro. "Low carbon technologies in low voltage distribution networks : probabilistic assessment of impacts and solutions." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/low-carbon-technologies-in-low-voltage-distribution-networks-probabilistic-assessment-of-impacts-and-solutions(cc5c77df-54fe-4c1c-a599-3bbea8fbd0c1).html.
Повний текст джерелаTADDIA, GLENDA. "Low Enthalpy Geothermal Open Loop Heat Pumps: a suitable tool for thermal energy supply in urban areas." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2617565.
Повний текст джерелаWorall, Mark. "An investigation of a jet-pump thermal (ice) storage system powered by low-grade heat." Thesis, University of Nottingham, 2001. http://eprints.nottingham.ac.uk/11111/.
Повний текст джерелаJenicek, David P. (David Pierre). "Design of low-power permanent-magnet synchronous motor for use in high-density heat pump." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66427.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 63).
An analytical model for the functionality of a permanent-magnet synchronous motor is developed. Taking as input a specific geometry, it predicts steady-state losses of a design at an average rate of 0.85 seconds per analysis, orders of magnitude faster than existing finite-element methods. A wide design space is analyzed and, based on the necessary motor profile and manufacturing limits, an optimal design is selected. Subsequently, this motor was fabricated and integrated with a prototype design of a high-density heat pump. This application requires an unusually low motor profile - with the motor width being much (~ 10 x ) larger than its thickness - which has not been explored by other researchers. Furthermore, the design metrics specify a tight upper bound of 33.3 W on available power. Electrical characteristics are modeled and tested to determine optimal phase-excitation waveforms. Finally, power electronics with a sensorless control scheme are designed and incorporated using a custom-designed printed circuit board at an all-inclusive cost of under $50, which is well below the price of typical development control boards used to test prototype motors. Speeds of up to 7000 RPM were observed. At the design point of 5000 RPM, the motor delivered 35 mN-m of torque and drew 23.8 W of power, significantly below the available power budget.
by David P. Jenicek.
M.Eng.
CASASSO, ALESSANDRO. "Low enthalpy geothermal systems: coupled flow and heat transport modelling of the long-term performances of Borehole Heat Exchangers." Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2496975.
Повний текст джерелаJanjua, Azeem. "Modelling and optimisation of a decentralised heat network and energy centre in London Docklands." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-377488.
Повний текст джерелаFernando, W. Primal D. "Experimental Investigation of Refrigerant Charge Minimisation of a Small Capacity Heat Pump." Doctoral thesis, Stockholm : Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4273.
Повний текст джерелаSakellari, Dimitra. "Modelling the dynamics of domestic low-temperature heat pump heating systems for improved performance and thermal comfort : a systems approach." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-269.
Повний текст джерелаPIERUCCIONI, DIEGO. "Analysis of geological parameters for optimization of geothermal probes applied to heat pumps: individuation of a technical and procedural iter." Doctoral thesis, Università degli Studi di Cagliari, 2016. http://hdl.handle.net/11584/266761.
Повний текст джерелаKrejsa, Petr. "Tepelné čerpadlo vzduch - voda." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318814.
Повний текст джерелаArnold, Mark Philipp [Verfasser], Johanna Akademischer Betreuer] Myrzik, and Krzysztof [Gutachter] [Rudion. "Integration of residential distributed generators and heat pumps into the low voltage grid from a voltage level perspective / Mark Philipp Arnold. Betreuer: Johanna Myrzik. Gutachter: Krzysztof Rudion." Dortmund : Universitätsbibliothek Dortmund, 2016. http://d-nb.info/1112561889/34.
Повний текст джерелаArnold, Mark Philipp Verfasser], Johanna [Akademischer Betreuer] Myrzik, and Krzysztof [Gutachter] [Rudion. "Integration of residential distributed generators and heat pumps into the low voltage grid from a voltage level perspective / Mark Philipp Arnold. Betreuer: Johanna Myrzik. Gutachter: Krzysztof Rudion." Dortmund : Universitätsbibliothek Dortmund, 2016. http://d-nb.info/1112561889/34.
Повний текст джерелаRatsam, Pavel. "Tepelné čerpadlo vzduch - voda." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241931.
Повний текст джерелаIlisei, Gheorghe. "Numerical analysis using simulations for a geothermal heat pump system. : Case study: modelling an energy efficient house." Thesis, Högskolan i Gävle, Energisystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29101.
Повний текст джерелаThe presentation was made via Skype due to the programme being online based
MARAFIOTI, CHIARA. "Application of solar assisted heat pump technology to the Palacus Sport Palace: renewable sources integration for highly efficient and low energy consumption systems." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1042214.
Повний текст джерелаGataveckas, Kipras. "Integruotas grunto ir mažaenergio pastato atliekinės šilumos panaudojimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140610_141426-25126.
Повний текст джерелаThe final master thesis presents technical analysis of low-energy residential building in Vilnius, Lithuania. Building has low temperature floor heating, mechanical ventilation with heat recovery unit and hot water preparation with buffer tank systems. Using “CASAnova” software is calculated fourth energy balances of building according fourth different heat transfer coefficients of the walls. All heating and cooling energy demand of a building is generated from the ground. It is made by using a heat pump with single borehole. A calculation of borehole sizing is made with “EED” software. Two energy saving technologies are analysed for a building. The first idea is to reduce heat energy consumption of hot water preparation. There is calculated benefit of waste water heat recovery heat exchanger which function is to pre-heat hot water using waste water from the shower. Second idea is to reduce heat energy consumption for fresh air heating in air handling unit. There is calculated benefit of earth-to-air heat exchanger using “GAEA” software. Final result of all calculations shows influence of heat transfer coefficient and energy saving technologies to building annual energy balance and depth of borehole. Economic benefit of using energy saving technologies is calculated. Structure: introduction, 6 chapters, conclusions and suggestions, references. Thesis consists of 64 p. of text, 41 figures, 14 tables and 31 bibliographical entries.
Tretera, Robin. "Návrh tepelného čerpadla pro vytápění rodinného domu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377038.
Повний текст джерелаCarbol, Marek. "Chladicí zařízení s pasivním výparníkem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-433516.
Повний текст джерелаLi, Yun. "Voltage balancing on three-phase low voltage feeder." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/voltage-balancing-on-threephase-low-voltage-feeder(4320ec9a-f287-4e83-86fd-c8e29e8d49f4).html.
Повний текст джерелаBack, Natalii. "Bergvärme som energikälla." Thesis, Mälardalen University, School of Sustainable Development of Society and Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-712.
Повний текст джерела2008-05-26
Bedrock heat as an energy source
The sun has warmed up the bedrock and this heat can be used for warming up houses. Approximately 100 – 200 meters down in the bedrock the temperature of the heat is stable. This is a source of energy that can be used by installing a heat pump system. The ground source heat pumps are low maintenance and can last for many years. There is also a pollution risk for the groundwater and therefore the wells in the area. Before the ground source heat pump can be installed the municipality need to give permission, according to the environmental code. To install the system without permission is a crime against the environmental code. A requirement when applying for permission to install the heat pump system is to get the neighbours to agree with the place for the bore hole. The neighbour can appeal against the environmental and health authorities’ decision to give permission to install the ground source heat pump system. However there needs to be more research done regarding the environmental effects that may occur in the future, if the ground source heatpump system continues to increase as rapidly as today.
Charvátová, Marie. "Vyhodnocení provozních dat tepelného čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401567.
Повний текст джерелаHrubý, Jakub. "Nízkoteplotní vytápění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230872.
Повний текст джерелаDávila, Aldás Paúl Sebastián. "Estudio teórico y experimental de los componentes térmicos para bombas de calor de resorción con CO2." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/670598.
Повний текст джерелаLa presente tesis realiza un estudio experimental del proceso de desorción de la mezcla CO2/acetona en un intercambiador de calor de placas. Se ha realizado una revisión bibliográfica de la demanda energética a nivel industrial para identificar rangos de temperaturas en los cuales puede implementarse la tecnología de bomba de calor. El ciclo de bomba de calor por compresión/resorción se define como una alternativa factible para el aprovechamiento de calor residual a baja y media temperatura (30 – 60ºC) hasta temperaturas útiles para procesos industriales (>80ºC). Se realiza la modelización de propiedades termodinámicas de la mezcla CO2/Acetona y del ciclo de bomba de calor por compresión/resorción. Se realizó un estudio paramétrico de las variables independientes y se obtuvieron rangos de operación respecto a presión, temperatura y composición en los cuales el ciclo funciona como bomba de calor. Se obtuvieron resultados de la eficiencia del ciclo y de la relación de caudales. Se han obtenido las condiciones de operación para llevar a cabo el estudio experimental del proceso de desorción de la mezcla en un intercambiador de placas formado por 4 placas/3 canales. Se ha diseñado y construido un equipo experimental para caracterizar el proceso de desorción de la mezcla CO2/acetona en el intercambiador de calor de placas. Se han obtenidos resultados para el coeficiente de transferencia de calor de la solución, flujo de calor y flujo másico de desorción en el intercambiador de calor de placas.
Heat pump technology is an interesting option to recover waste heat at low temperatures (40 – 60ºC) and upgrade it to temperatures above 80ºC to meet the heat demand in industrial processes, and thus reduce consumption of primary energy and associated CO2 emissions. Current heat pump technologies are limited by the thermodynamic properties of working fluids and the resistance of their components. Compression/resorption heat pumps using refrigerant/absorbent working fluid mixtures such as CO2/acetone can operate at low high pressures with good performances. This research aims to experimentally study the desorption process in a plate heat exchanger of the CO2/Acetone mixture as an alternative for its use in the compression/ resorption heat pump cycle. The experimental results show values for the heat transfer coefficient (hs) between 0.2 and 0.5 kW/ m2K. An increase in the temperature of the heating water and a low temperature difference between the heating water and the temperature of the solution at the desorber´s inlet enhance the heat transfer. The hs value decreases as the pressure of the experiment increases. The heat transfer in the heat exchanger improves with low mass fractions of CO2 in the CO2/Acetone solution (22 % - 25%). The calculated mean vapour quality reaches a maximum value of 16% at a test pressure of 12 bar. The calculated heat transfer in the heat exchanger is between the 1.5 and 5 kW/ m2 range. The calculated desorption flow is between 0.002 and 0.005 kg/s.
Toman, Petr. "Tepelné čerpadlo s chladivem R 290." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401558.
Повний текст джерелаAzad, Mohammad. "Evaluation of an Energy System for multi-family houses with Combination of Exhaust Air Heat Pump and PV : Case Study: Demonstration Building of The EU Energy Matching Project, Sweden-Ludvika." Thesis, Högskolan Dalarna, Energiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:du-28650.
Повний текст джерелаGustafsson, Marcus. "Energy Efficient Renovation Strategies for Swedish and Other European Residential and Office Buildings." Doctoral thesis, KTH, Strömnings- och klimatteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-206186.
Повний текст джерелаByggnadssektorn står för omkring 40 % av den totala energianvändningen i EU. Den höga energianvändningen i Europeiska byggnader kan till stor del tillskrivas den stora andelen gamla byggnader med dålig energiprestanda. Energirenovering av byggnader, eller energieffektivisering genom renovering, kan därför anses utgöra en central del i arbetet mot EU:s klimat- och energimål för år 2030. Trots detta är det ännu inte helt klarlagt vilka strategier som ska tillämpas för att uppnå detta och hur det påverkar energisystemet, och i nuläget är renoveringstakten fortfarande väldigt låg. Målet med denna avhandling är att undersöka ekonomiska och miljömässiga aspekter av strategier för energirenovering, såväl byggnadsskalsåtgärder som aktiva system, för typiska bostads- och kontorsbyggnader i Sverige och i andra Europeiska regioner. Mer specifikt har arbetet följande två inriktningar: Renovering av svenska, fjärrvärmevärmda flerfamiljshus, inklusive livscykelkostnadsanalys och livscykelmiljöanalys samt påverkan på det lokala energisystemet; Renovering av Europeiska bostads- och kontorsbyggnader, inklusive livscykelkostnadsanalys och livscykelmiljöanalys samt påverkan av klimatförutsättningar. Byggnader typiska för respektive region och byggnadsperioden 1945-1970 modellerades och användes i simuleringar för att fastställa den övergripande möjligheten och energibesparingspotentialen för olika renoveringsåtgärder i Europeiska klimat. En rad system för värme, kyla och ventilation studeras, samt solenergisystem, med fokus på värmepumpar, fjärrvärme, lågtemperaturvärmesystem och värmeåtervinning ur frånluft. Jämfört med renovering av byggnader utan energieffektiviseringsåtgärder kan energirenovering i många fall minska såväl livscykelkostnaden som miljöpåverkan. Vid renovering av typiska Europeiska kontorsbyggnader lönar det sig mer att renovera ner till ett uppvärmningsbehov på 25 kWh/(m²∙år) än 45 kWh/(m²∙år), då den minskade kostnaden för köpt energi väger upp den ökade kostnaden för isolering. För flerfamiljshus i södra Europa kan mer ambitiösa mål gällande värmebehov också vara lönsamma, medan en mer måttlig nivå är lämplig för småhus. Solvärme- eller solelsystem kan användas för att minska byggnaders miljöpåverkan. Utan subventioner eller inmatningstariff för överskottsel kan det bli svårt att få lönsamhet i dessa system för kontorsbyggnader i Nord- och Centraleuropa samt för småhus. För flerfamiljshus kan solenergisystem dock sänka den totala livscykelkostnaden, såväl i södra som i norra Europa. Värmeåtervinning och lågtemperaturvärmesystem visade sig båda ha större inverkan i kallare klimat. Lågtemperaturvärmesystem förbättrar värmefaktorn för värmepumpar, i synnerhet när uppvärmningsbehovet är stort i förhållande till varmvattenbehovet. Vid renovering av byggnader med vattenburna radiatorer kan konvertering till tilluftsradiatorer sänka framledningstemperaturen i värmesystemet. I svenska flerfamiljshus kan frånluftsvärmepump vara ett kostnadseffektivt komplement till fjärrvärme, medan från- och tilluftsventilation med värmeåtervinning är dyrare men mer sannolikt att ge en minskad primärenergianvändning. I ett systemperspektiv kan frånluftsventilation utan värmeåtervinning minska primärenergianvändningen i fjärrvärmeverket lika mycket som en frånluftsvärmepump, tack vare den lägre elanvändningen.
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Segond, Guillaume. "Etudes des couplages thermohydrauliques en régime variable d'un système thermique avec stockage : application à la production d'eau chaude sanitaire à partir de la valorisation d'une source de chaleur basse température." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4722.
Повний текст джерелаThe work presented here aims to study and optimize the energy efficiency of a heat pump water heater coupled with a sensible heat storage. The resource used consists of heat recovery from exhaust air of a collective type of housing. The challenge is to characterize the conditions in which the system is capable of ensuring the needs with performance required when the boundary conditions are very volatile. Functionally, the system should be as simple as possible from the viewpoint of its hydraulic configuration and its control strategy.For this study, we developed a TRNSYS numerical model to simulate and analyze different scenarios and thermal hydraulic couplings between the system components. In parallel with this modeling approach, we designed and implemented an experimental set up with realistic scale to validate the model over a wide range of operating conditions.The analysis of the results, including the nature of flows within the storage tank, highlighted the major influence on a number of parameters on the system performance. In particular, the robust performance in the face of significant fluctuations of the boundary conditions can be ensured through appropriate control strategy.This study eventually led to propose a model for the design of the system that takes into account the most relevant parameters for the control strategy
Zaťková, Miroslava. "Tepelná čerpadla ve vytápění." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226003.
Повний текст джерелаRaputa, Pavel. "Otopné plochy a mikrobiální mikroklima." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227488.
Повний текст джерелаMikoláš, Petr. "Pokročilé metody aplikace tepelné techniky při návrhu vytápění budovy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391961.
Повний текст джерелаJelínek, Roman. "Bytový dům ve Zlíně." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225804.
Повний текст джерелаKesharwani, Siddhi. "Low Head Hydraulic Pumping – Design, Simulation, and Field Validation of Ram and Turbine Pump in Indian River Basin." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6114.
Повний текст джерела鄭太一. "Development and Study of a Low Temperature Heat Pump Dehumidifying Dryer." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/65045828233633209439.
Повний текст джерела國立屏東科技大學
機械工程系
92
The traditional drying methods adopted for agricultural products are commonly fire-based or electricity-based, more specifically, using high temperature between 50~120℃ to dry agricultural products. In general, those methods are energy consuming, costly, pollutant, fire hazardous, and short in product life. Therefore, this study aims to develop a heat-pump low-temperature dehumidifying dryer (operating at temperature between 10~55℃) for energy saving and safety purposes. The concept of this dryer is based pm replacing the freezing compressor with the traditional diesel or electric heater inside a dryer, then condensing and recycling the thermal energy contained in the air discharged in a drying room as the heating energy. Such method can save a considerable amount of energy. The features of the heat-pump low-temperature dehumidifying dryer developed by this study are as follows: 1. The variation of wind velocity of upper and lower layer is between 0.1~0.3m/s. 2. The operating temperature is between 10~55℃ and the drying time is between 2.5-4 hours. 3. The single-dot temperature variation of the temperature change in the dryer can be controlled within 1℃; operating under 50℃±3℃, the difference of high and low temperatures can be controlled within 5.0℃ with average temperature difference at 0.97℃ and the standard deviation of temperature is 0.28. 4. The humidity of the dryer is between10%RH~95%RH; and drops from58.4% to 10%RH when the temperature increases to 49℃; and between 10.1%RH~40.9%RH when the temperature drops from 47℃ to 10℃. Furthermore, the heat-pump low-temperature dehumidifying dryer had undergone larval fish drying experiment. The results showed that: 1. The ideal temperature for drying larval fish is between 32℃~38℃ for time span of 2.5~4.0 hours; if the thickness of fry stack is between 1~2cm, the water content after drying is between 12.95~18.25%; 2. Compared with hot-air dryer, the physiology, water activity, color change, fatty acid valence, and VBN of the larval fish dried by heat-pump low-temperature dehumidifying dryer prevailed; 3. Evaluation on the larval fish production over one year of fishing season in Finagling showed that the profitability of larval fish dried with the heat-pump low-temperature dehumidifying dryer can surpass the larval fish dried with the traditional freezing or steam-dried larval fish. According to measurements of dry bulb temperature and absolute humidity, and the mutual proof supported by the thermodynamic equation and air-humidity curve, the dryer developed by this study carried respectable credibility, applicability, and validity, as well as values in practical utility. In future, improvements on the variance in wind direction and velocity can extend its applicable fields.
Tan, Chung-Ping, and 譚仲平. "Low Power 4T SRAM with Heap Pump BoostedCell Supply Voltage and Negative Word Line." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/10788574301971807282.
Повний текст джерела國立臺灣大學
電機工程學研究所
96
Static random access memory (SRAM) has its own name known loud and clear in the hood of the high speed memory applications. From the level 2 (L2) caches in the gigahertz multi-core central processing units (CPUs), level 3 (L3) caches in the high speed switches, hubs and network servers to the embedded uses such as the liquid crystal display (LCD) driver ICs, system-on-a-chips (SoCs) and cell phone integrations, SRAM works all. It aims to the field of the high speed data rate use in a rather smaller memory size in both memory capacity and die area with full of the flexibility and integrability. Despite the mostly adopted 6-T memory cell is so classic and seemingly flawless. When talking of the necessarily active area issue then is another story. Less is more, hence we assume the 4-T cell to be the memory core of our design. With the aid of the negative word line scheme, the dramatically increased sub-threshold leakage in the sub-micron technology is then effectively eliminated without using any special process fabrication technology. As to noise, boosting the cell supply voltage gains us a significantly static noise margin (SNM) improved with a little extra power penalty. Meanwhile, the CMOS technology is the chosen one for us with the higher-level system integration and lower-cost manufacturing requirement. Looking forward to be in the way of making it powerful but not power hungry. In this thesis, we propose a SNM improved, low power consumption 1k 4-T SRAM structure with the boosted cell power supply by the proposing voltage heap pump, and the negative word line scheme in order to minimize the stand-by gate leakage current. Further, by proposing a current to voltage type current sense amplifier with Schmitt trigger adds a little help to fight for the noise interference. Simulated in the TSMC 0.18um CMOS process, the SNM of this 1k SRAM circuit is 530mV with the stand-by leakage current about 0.082mA, and consumes only 0.18mW, 9.43mW and 7.38mW in stand-by, read and write, respectively.
Tan, Chung-Ping. "Low Power 4T SRAM with Heap Pump BoostedCell Supply Voltage and Negative Word Line." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1407200816325900.
Повний текст джерелаHUANG, WAN-CHENG, and 黃萬成. "On the chemical heat pump system and its second law efficiency." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/89915015693251826138.
Повний текст джерелаVEJVODA, Jan. "Nízko-potenciální odpadní teplo produkované JE Temelín a jeho možné využití." Master's thesis, 2015. http://www.nusl.cz/ntk/nusl-202576.
Повний текст джерелаКравченко, Сергій Іванович. "Аналіз можливості використання низькопотенційної теплоти для потреб багатоквартирних будинків". Магістерська робота, 2020. https://dspace.znu.edu.ua/jspui/handle/12345/3762.
Повний текст джерелаUA : Робота викладена на 84 сторінках друкованого тексту, містить 12 таблиць, 28 рисунків. Перелік посилань включає 40 джерел з них на іноземній мові 1. Особлива увага приділена низькопотенційним поновлюваним джерелам енергії відхідних вентиляційних газів багатоповерхових будинків. Для визначення можливого потенціалу та економічного обґрунтування доцільності використання таких джерел енергії, проведено експеримент, у ході якого були визначені температури та величини теплових потоків у шахтах будівель. На підставі виконаних досліджень та розрахунків, розроблено схему утилізаційної установки та підібрано необхідне основне та допоміжне обладнання. відхідних вентиляційних газів багатоповерхових будинків. Для визначення можливого потенціалу та економічного обґрунтування доцільності використання таких джерел енергії, проведено експеримент, у ході якого були визначені температури та величини теплових потоків у шахтах будівель. На підставі виконаних досліджень та розрахунків, розроблено схему утилізаційної установки та підібрано необхідне основне та допоміжне обладнання.
EN : The work is presented on 84 pages of printed text, contains 12 tables, 28 figures. The list of references includes 40 sources, 1 of them in foreign language. Particular attention is paid to low-potential renewable energy sources -exhaust gases of multi- storey buildings. To determine the possible potential and economic justification of the feasibility of using such energy sources, an experiment was conducted, during which temperatures and heat fluxes in the mines of buildings were determined. On the basis of the performed researches and calculations, the scheme of the utilization installation is developed and the necessary basic and auxiliary equipment is selected.