An experimental evaluation of the transcritical CO2 refrigerator performances using an internal heat exchanger

2008 ◽  
Vol 31 (6) ◽  
pp. 1006-1011 ◽  
Author(s):  
Ciro Aprea ◽  
Angelo Maiorino
Keyword(s):  
Heat Exchanger ◽  
Experimental Evaluation ◽  
Internal Heat ◽  
Internal Heat Exchanger

THERMODYNAMIC ANALYSIS AND EXPERIMENTAL RESEARCH OF TRANSCRITICAL CO2 CYCLE WITH INTERNAL HEAT EXCHANGER AND DUAL EXPANSION

2013 ◽  
Vol 21 (01) ◽  
pp. 1350005 ◽  
Author(s):  
Z. WANG ◽  
Y. GONG ◽  
X. H. WU ◽  
W. H. ZHANG ◽  
Y. L. LU
Keyword(s):  
Heat Exchanger ◽  
Experimental Evaluation ◽  
Pressure Fluctuations ◽  
Internal Heat ◽  
Energy Performance ◽  
Evaporation Temperature ◽  
Internal Heat Exchanger ◽  
Side Pressure ◽  
Wide Range ◽  
Compressor Power

This work presents the experimental evaluation of the energy performance of transcritical CO2 refrigeration and heat pump systems. The optimal gas cooler pressures and the optimal COP have been analyzed from a thermodynamic point of view. The systems used a new dual expansion valve and a balance CO2 liquid receiver adjustment device, which can control high and low side pressure effectively. Moreover, we demonstrate the influence of the internal heat exchanger (IHX) on the systems' performances, on the basis of the analysis of the relative COP index RCOPI, the compressor power index RPCI and other parameters which can confirm the truth of. The experimental evaluation covers five evaporating levels (-10 to 10°C) and in a wide range of gas cooler pressures (75 to 120 bar). It is concluded that with the IHX system, compressor power is relatively low when the high side pressure is over 100 bar, and the evaporation temperature is below 0°C. The COP of the system without the IHX is slightly higher than the system with the IHX; it is increasing about 3% to 5%, when the evaporation temperature is over 5°C. Relative to the single expansion process, the dual expansion cycle can decrease the influence of pressure fluctuations of CO2 supercritical fluid and liquid mixture on the systems.

scholarly journals Experimental evaluation of an internal heat exchanger in a CO2 subcritical refrigeration cycle with gas-cooler

2015 ◽  
Vol 80 ◽  
pp. 31-41 ◽  
Author(s):  
Rodrigo Llopis ◽  
Carlos Sanz-Kock ◽  
Ramón Cabello ◽  
Daniel Sánchez ◽  
Enrique Torrella
Keyword(s):  
Heat Exchanger ◽  
Experimental Evaluation ◽  
Internal Heat ◽  
Refrigeration Cycle ◽  
Internal Heat Exchanger

Experimental evaluation of the effect of an internal heat exchanger on a transcritical CO2 ejector system

2011 ◽  
Vol 12 (2) ◽  
pp. 146-153 ◽  
Author(s):  
Xiao-xiao Xu ◽  
Guang-ming Chen ◽  
Li-ming Tang ◽  
Zhi-jiang Zhu ◽  
Shuang Liu
Keyword(s):  
Heat Exchanger ◽  
Experimental Evaluation ◽  
Internal Heat ◽  
Internal Heat Exchanger ◽  
Ejector System

Thermodynamic Analysis and Experimental Investigation of Internal Heat Exchanger Influence on CO2 Trans-Critical Cycle Performance

2012 ◽  
Vol 614-615 ◽  
pp. 259-264
Author(s):  
Wen Hui Zhang ◽  
Zhe Wang ◽  
Yi Gong ◽  
Xue Hong Wu ◽  
Yan Li Lu
Keyword(s):  
Heat Exchanger ◽  
Experimental Evaluation ◽  
Internal Heat ◽  
Energy Performance ◽  
Point Of View ◽  
Cycle Performance ◽  
Evaporation Temperature ◽  
Internal Heat Exchanger ◽  
Wide Range ◽  
Compressor Power

This work present the experimental evaluation of the energy performance of trans-critical CO2refrigeration and heat pump systems. The optimal gas cooler pressure and the optimal COP have been analysed from a thermodynamic point of view. The experimental evaluation covers five evaporating levels (-10 to 10°C) and in a wide range of gas cooler outlet pressures (75 to 120bar). It is concluded that: With the the internal heat exchanger (IHX) system compressor power is relatively low, when the high side pressure is over 100bar, and the evaporation temperature is below 0°C. The COP of the system without IHX is slightly higher than the system with the IHX, it is increase about 3% to 5%, when the evaporation temperature is over 5°C.

scholarly journals Experimental evaluation of internal heat exchanger influence on R-22 window air conditioner retrofitted with R-407C

2010 ◽  
Vol 14 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Raghavan Vijayan ◽  
Pss Srinivasan
Keyword(s):  
Heat Exchanger ◽  
Experimental Evaluation ◽  
Internal Heat ◽  
Coefficient Of Performance ◽  
Air Conditioner ◽  
Alternative Refrigerant ◽  
Internal Heat Exchanger ◽  
The Given

The performance of one ton of refrigeration window air conditioner working with R-22 and retrofitted with eco friendly alternative refrigerant R-407C is experimentally investigated An internal heat exchanger is also added to the same air conditioner to provide liquid overfeeding operation. When retrofitting the R-22 system with R-407C, the coefficient of performance is found to drop by 7.28%, however when internal heat exchanger is included the performance is improved. It is observed that the inclusion of internal heat exchanger has increased the coefficient of performance by 5.86% when running on R-22 and 6.18% when running on R-407C, under the given conditions.

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