Search Results - subject:"Transcritical cycle"

Transcritical organic Rankine vapor compression refrigeration system for intercity bus air-conditioning using engine exhaust heat

Yılmaz, Alper - In: Energy 82 (2015) C, pp. 1047-1056

T-ORVC (Transcritical organic Rankine vapor compression) refrigeration system for intercity bus air-conditioning using engine exhaust heat is investigated. Wet refrigerant R134a and dry refrigerant R245fa are considered as refrigerants. Typical efficiencies for pump, turbine and compressor...

Persistent link: https://www.econbiz.de/10011209482

The effect of storage temperature on the performance of a thermo-electric energy storage using a transcritical CO2 cycle

Baik, Young-Jin; Heo, Jaehyeok; Koo, Junemo; Kim, Minsung - In: Energy 75 (2014) C, pp. 204-215

To investigate the behavior of the round-trip efficiency of transcritical-CO2-cycle-based TEES (thermo-electric energy storage) according to the changes in the temperature of the low-temperature hot storage tank, the charging and discharging processes were optimized at various temperature...

Persistent link: https://www.econbiz.de/10011053553

Isothermal transcritical CO2 cycles with TES (thermal energy storage) for electricity storage

Kim, Young-Min; Shin, Dong-Gil; Lee, Sun-Youp; Favrat, … - In: Energy 49 (2013) C, pp. 484-501

Recently, TEES (thermo-electric energy storage) systems have been proposed as a new method for large-scale energy storage wherein electric power is stored as thermal energy by using a heat pump and retrieved from the TES (thermal energy storage) by using a heat engine. The advantages of TEES...

Persistent link: https://www.econbiz.de/10010810164

A review of transcritical carbon dioxide heat pump and refrigeration cycles

Ma, Yitai; Liu, Zhongyan; Tian, Hua - In: Energy 55 (2013) C, pp. 156-172

transcritical cycle began, theoretical and experimental researches, as well as commercial system development, has improved to make … an analysis of some special characteristics of the basic carbon dioxide transcritical cycle such as the optimum system …

Persistent link: https://www.econbiz.de/10010811784

Experimental investigation on performance of transcritical CO2 heat pump system with ejector under optimum high-side pressure

Xu, Xiao Xiao; Chen, Guang Ming; Tang, Li Ming; Zhu, … - In: Energy 44 (2012) 1, pp. 870-877

Since the fixed ejector cannot adjust the optimum high-side pressure, the adjustable ejector is designed and built based on a transcritical CO2 heat pump system model results. The adjustable ejector is subjected to electrical pulses through the stepper motor which drives needle forward or...

Persistent link: https://www.econbiz.de/10010808923

Thermodynamic analysis and optimization of novel ejector-expansion TRCC (transcritical CO2) cascade refrigeration cycles (Novel transcritical CO2 cycle)

Yari, Mortaza; Mahmoudi, S.M.S. - In: Energy 36 (2011) 12, pp. 6839-6850

is an ejector-expansion transcritical cycle and the bottom cycle is a sub-critical CO2 cycle. In one of these proposed …

Persistent link: https://www.econbiz.de/10010811012

Transcritical carbon dioxide heat pump systems: A review

Austin, Brian T.; Sumathy, K. - In: Renewable and Sustainable Energy Reviews 15 (2011) 8, pp. 4013-4029

distinctions of the transcritical cycle, followed by a numerical analysis of transcritical cycle performance. The study will then …

Persistent link: https://www.econbiz.de/10010573529

Theoretical study of a transcritical ejector refrigeration cycle with refrigerant R143a

Yu, Jianlin; Du, Zhenxing - In: Renewable Energy 35 (2010) 9, pp. 2034-2039

In this paper, a transcritical ejector refrigeration cycle (TERC) using refrigerant R143a as working fluid is proposed to improve the performance of the ejector refrigeration systems driven by low-grade thermal energy. This method adopts an adequate combination of thermal and mechanical energy...

Persistent link: https://www.econbiz.de/10010805695