Performance assessment of a low-grade heat driven dual ejector vapour compression refrigeration cycle

The refrigeration units currently used in road transport vehicles are predominantly of the vapour compression refrigeration (VCR) type but this work represents study of air conditioning in automobile based on ammonia water vapour absorption system using hot exhaust gases as an energy source. In the study an experimental set up is designed and fabricated to use low grade heat energy i.e. exhaust gases as input heat to the system.

Download Full-text

A novel cooling and power cycle based on the absorption power cycle and booster-assisted ejector refrigeration cycle driven by a low-grade heat source: Energy, exergy and exergoeconomic analysis

Energy Conversion and Management ◽

10.1016/j.enconman.2019.112321 ◽

2020 ◽

Vol 204 ◽

pp. 112321 ◽

Cited By ~ 8

Author(s):

Yazi Wang ◽

Tian Chen ◽

Yingbo Liang ◽

Huaibo Sun ◽

Yiping Zhu

Keyword(s):

Heat Source ◽

Low Grade ◽

Refrigeration Cycle ◽

Power Cycle ◽

Exergoeconomic Analysis ◽

Low Grade Heat ◽

Absorption Power

Download Full-text

Photovoltaic Driven Liquid Dehumidification Air-Conditioning System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.805-806.125 ◽

2013 ◽

Vol 805-806 ◽

pp. 125-130

Author(s):

Xiu Wei Li ◽

Xiao Song Zhang ◽

Qing Cheng

Keyword(s):

Air Conditioning ◽

Electric Energy ◽

Coefficient Of Performance ◽

Low Grade ◽

Power Performance ◽

Air Conditioning System ◽

Libr Solution ◽

Driven System ◽

Low Grade Heat ◽

Vapour Compression

Liquid dehumidification air-conditioning system is a promising air-conditioning system as it is environment-friendly, capable of utilizing low grade heat and less dependent on the electric power. However, because of the heat waste, its performance is not yet as competitive as vapour compression system. To improve, a photovoltaic driven system is proposed in this paper: electricity is applied to regenerate desiccant; the electric energy comes from solar power. Performance analysis has been made. The results show the coefficient of performance of the new system is influenced by the concentration of the desiccant and can approach 6 at certain circumstances. It also shows that LiBr solution is more favorable among three common used desiccants. Moreover, this paper presents the new progress of experimental research on this system.

Download Full-text

Performance study of an enhanced ejector refrigeration cycle with flash tank economizer for low-grade heat utilization

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2018.05.038 ◽

2018 ◽

Vol 140 ◽

pp. 43-50 ◽

Cited By ~ 13

Author(s):

Ye Liu ◽

Hua Fu ◽

Jianlin Yu

Keyword(s):

Low Grade ◽

Refrigeration Cycle ◽

Performance Study ◽

Heat Utilization ◽

Flash Tank ◽

Low Grade Heat

Download Full-text

Theoretical energy performance assessment and environmental impact of various new ozone-friendly refrigerants used in residential air conditioners

Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering ◽

10.1177/0954408920928260 ◽

2020 ◽

Vol 234 (4) ◽

pp. 367-385

Author(s):

Sharmas Vali Shaik ◽

TP Ashok Babu

Keyword(s):

Energy Efficiency ◽

Global Warming ◽

Environmental Impact ◽

Performance Assessment ◽

Global Warming Potential ◽

Energy Performance ◽

Refrigeration Cycle ◽

Efficiency Ratio ◽

Air Conditioners ◽

Vapour Compression

This study focuses on energy performance investigation and environmental impact analysis of various new ecofriendly refrigerant blends as alternatives to high global warming potential refrigerant R22 theoretically. In this study, 23 refrigerants were considered at various composition. The present work considered the practical vapour compression refrigeration cycle for the performance assessment of various R22 alternatives. Essential studies such as toxicity, flammability, and total equivalent warming index of various novel refrigerants were also conducted in this study. Results obtained from practical vapour compression refrigeration cycle revealed that the energy efficiency ratio of refrigerants such as R1270 (2.860) and RB03 (R290/R152a of 60/40 in mass %) (2.854) was closer to the energy efficiency ratio of R22 (2.940). Volumetric refrigeration capacity (VRC) of R1270 (3293 kJ/m3) was similar to that of R22 (3297 kJ/m3) whereas VRC of RB03 (2908 kJ/m3) was almost similar to that of R407C (2925 kJ/m3) which was an alternative to R22. Compressor discharge temperature of RB03 was 15.78 ℃ lower when compared to R22. Flammability study revealed that all the new refrigerant blends (RB01 to RB04) were classified into weakly flammable (A2) and flammable (A3) category refrigerants whereas toxicity study revealed that all the investigated refrigerants were classified into non-toxic group (A). Refrigerant blend RB03 was less flammable compared to R1270. Total equivalent warming index analysis revealed that the environmental impact of R422A was 27.88% higher than R22 whereas RB03 has 4.97% lower environmental impact compared to R22. Overall, performance of refrigerant blend RB03 was better compared to 23 investigated refrigerants and it was very nearer to the performance of R22 and hence, it could be considered as an ecofriendly alternative to replace high global warming potential refrigerant R22 used in air conditioners.

Download Full-text