scholarly journals Analyzing Properties of Air as a natural refrigerant using MCDM methodology

2021 ◽  
Vol 1059 (1) ◽  
pp. 012040
Author(s):  
Mohammed Hameeduddin Haqqani ◽  
Mohammed Azizuddin ◽  
Syed Shuibul Qarnain ◽  
S. Bathrinath
Keyword(s):  
Natural Refrigerant

A Study on the Performance of Drinking Fountain Using CO2 Heat Pump under Different System Pressures

2010 ◽  
Vol 44-47 ◽  
pp. 2433-2437 ◽  
Author(s):  
Yu Lieh Wu ◽  
Yu Dai Shiue ◽  
Kuo Hsiang Chien ◽  
Chiu Li Wang
Keyword(s):  
Carbon Dioxide ◽  
Heat Source ◽  
Heat Pump ◽  
Air Conditioning ◽  
High Performance ◽  
High Efficiency ◽  
Electric Heating ◽  
Alternative Refrigerant ◽  
Saving Effect ◽  
Natural Refrigerant

To avoid continuous damage of ozone layer and deterioration of global warming, many countries have devoted to the development and application of natural refrigerant. Although CO2, an alternative refrigerant in the area of air conditioning is not the best all-temperature refrigerant, it has the lowest operating risk as compared to hydrocarbon (HCs) and ammonia.Traditional drinking fountain provides heat source through secondary energy source - electric heating; however, the heating effect is limited. Since heat pump has a high performance, this study used a carbon dioxide heat pump, which has energy-saving effect and high efficiency, to provide heat source to drinking fountains. It further assembled the drinking fountain system with carbon dioxide heat pump and analyzed its performance.

Multi-function thermal system with natural refrigerant for a wide temperature range

2019 ◽  
Vol 162 ◽  
pp. 114189
Author(s):  
Jia Tong Jiang ◽  
Bin Hu ◽  
R.Z. Wang ◽  
Zhi Qiang Yu ◽  
Guo Liang Mao
Keyword(s):  
Wide Temperature Range ◽  
Thermal System ◽  
Temperature Range ◽  
Natural Refrigerant

Vortex Tube Expansion Transcritical CO2 Heat Pump Cycle

2012 ◽  
Vol 190-191 ◽  
pp. 1340-1344 ◽  
Author(s):  
Ying Fu Liu ◽  
Chun Jing Geng ◽  
Guang Ya Jin
Keyword(s):  
Heat Pump ◽  
Ozone Depletion ◽  
System Performance ◽  
Vortex Tube ◽  
Outlet Temperature ◽  
Throttle Valve ◽  
Refrigerant Alternatives ◽  
Natural Refrigerant ◽  
Tube Expansion ◽  
Better Than

The application of natural refrigerant CO2 is of great significance to reduce the greenhouse effect and ozone depletion. Transcritical CO2 heat pump cycle is presently an important aspect of natural refrigerant alternatives research. In this paper, a vortex tube expansion transcritical CO2 heat pump cycle is established and compared to that of the transcritical CO2 refrigeration cycle with throttle valve. Thermodynamic analysis results indicate that the system performance of vortex tube expansion transcritical CO2 heat pump cycle is better than the transcritical CO2 heat pump cycle with throttle valve, and the COPh improvement is 5.8%~13.9% at given conditions. The gas-cooler outlet temperature has a great impact on the system performance, there is a higher COPh improvement when the cycle at lower evaporation temperature or higher gas-cooler outlet temperature.

Performance of a Split-Type Air Conditioner with Natural Refrigerant R1270 to Replace R22

2011 ◽  
Vol 243-249 ◽  
pp. 4979-4982 ◽  
Author(s):  
Jian Bo Chen ◽  
He Li ◽  
Chao Yang Ji ◽  
Ling Xi
Keyword(s):  
System Performance ◽  
Cooling Capacity ◽  
Air Conditioner ◽  
Environment Friendly ◽  
Cooling Performance ◽  
Natural Refrigerant

A natural and environment friendly refrigerant propylene (R1270) is proposed as a substitute of R22 in the residential air conditioner. The experiments on the cooling performance of the air conditioner with R1270 and R22 were respectively conducted on an existing enthalpy potential bench, during the degree of superheating keep constant and refrigerant charge directly on the conditioner, also the effect on system performance in the condensing temperature was tested, it is founded that the cooling capacity of R1270 air conditioner was 96% that of R22 air conditioner while the COP of the former increased, and the refrigerant charge amount of R1270 was 56.8 % lower than R22.

Friction and Wear of Lubricated Sliding Surfaces of Coated Vane and Flange in Rotary Compressor with Carbon Dioxide as a Refrigerant

2007 ◽  
Vol 353-358 ◽  
pp. 1785-1788
Author(s):  
Hong Gyu Jeon ◽  
Kyu Sun Lee ◽  
Sung Oug Cho ◽  
Young Ze Lee
Keyword(s):  
Carbon Dioxide ◽  
Friction And Wear ◽  
Hard Coatings ◽  
Rotary Compressor ◽  
Sliding Surfaces ◽  
Natural Refrigerant ◽  
Air Conditioning Systems ◽  
Friction And Wear Characteristics ◽  
Rotary Type ◽  
Lubricated Sliding

Due to the environmental concerns, especially the greenhouse effect and GWP (Global Warming Potential), the carbon dioxide was investigated as an alternative natural refrigerant to replace HFCs (HydroFluoroCarbons) in refrigerator or air conditioning systems. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between vane and flange in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN and WC/C, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. The vane-on-flange type lubricated sliding tests were performed with a high pressure wear tester using HFC (R410A) and carbon dioxide. From the tests, wear volumes of vane surfaces applied with various coatings were compared each other.

Performance of Air Cooled Heat Pump Air Conditioner with Natural Refrigerant R1270 and R290 to Replace R22

2011 ◽  
Vol 374-377 ◽  
pp. 484-487
Author(s):  
Jian Bo Chen ◽  
He Li ◽  
Ling Xi
Keyword(s):  
Heat Pump ◽  
Original System ◽  
Cooling Capacity ◽  
Air Conditioner ◽  
Environment Friendly ◽  
Running Performance ◽  
Natural Refrigerant

A natural and environment friendly refrigerant propylene and propane are proposed as the substitute of R22 in air conditioner. The experiments were respectively conducted on an existing enthalpy potential lab. Refrigerant charge was held at the constant superheat condition. It is founded that the cooling capacity of R1270 was 96% of R22 system while the R290 was 92% of R22 system, but the COP bother higher than the former system, the refrigerant charge of R1270 was reduced 56.8% of R22 while R290 was 58.4%. With the condensing temperature increased, the system’s cooling capacity is gradually reduced, the cooling capacity of R1270 and R290 are decreased faster than R22, this indicate that R1270 can improve the running performance of system and has more advantages than R290 as substitute for R22, if do some improvement to the original system, can obtain a better results.

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