The performance analysis of a novel absorption refrigeration cycle used for waste heat with large temperature glide

2016 ◽  
Vol 93 ◽  
pp. 692-696 ◽  
Author(s):  
Yuqi Shi ◽  
Guangming Chen ◽  
Daliang Hong
Keyword(s):  
Performance Analysis ◽  
Waste Heat ◽  
Large Temperature ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration

scholarly journals Performance Analysis of a Combined Cycle Power Plant with Simultaneous Cooling of Inlet Air Streams to the Compressor and Condenser

2018 ◽  
Vol 4 (1) ◽  
pp. 2-25
Author(s):  
Ifeanyi Henry Njoku ◽  
Chika Oko ◽  
Joseph Ofodu
Keyword(s):  
Power Plant ◽  
Performance Analysis ◽  
Waste Heat ◽  
Combined Cycle ◽  
Integrated System ◽  
Refrigeration Cycle ◽  
Exergy Destruction ◽  
Combined Cycle Power Plant ◽  
Absorption Refrigerator ◽  
Air Streams

Abstract: This paper presents the thermodynamic performance analysis of an existing combined cycle power plant to be retrofitted with a waste heat driven aqua lithium bromide absorption refrigerator for cooling the inlet air streams to the compressor and air-cooled steam condenser. The power plant is located in the hot and humid tropical region of Nigeria, latitude 4°45′N and longitude 7°00′E. This was achieved by performing energy and exergy analysis of the integrated system. Using the operating data of the existing combined cycle power plant, the results of the analysis showed that by cooling the inlet air streams to 15oC at the compressors, and to 29oC at the air-cooled steam condenser, the net power output, thermal and exergy efficiencies of the combined cycle plant increased by 7.7%, 8.1% and 7.5% respectively while the plant total exergy destruction rate and specific fuel consumption dropped by 10.8% and 7.0% respectively. The stack flue gas exit temperature reduced from 126oC to 84oC in the absorption refrigerator, thus reducing the environmental thermal pollution. The COP and exergy efficiency of the refrigeration cycle was 0.60 and 27.0%, respectively. Results also show that the highest rate of exergy destruction in the combined cycle power plant occurred in the combustion chamber while the highest rate of exergy destruction in the absorption refrigeration cycle occurred in the evaporator followed by the absorber.

601 Fundamental Characteristics of Generator in Absorption refrigeration cycle driven by waste heat

2008 ◽  
Vol 2008 (0) ◽  
pp. 159-160
Author(s):  
Atsushi TSUJIMORI ◽  
Tetsu KIM ◽  
Ryuta AYABE ◽  
Takumi UEYAMA ◽  
Reika OKAMURA ◽  
...  
Keyword(s):  
Waste Heat ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration

ENERGY AND EXERGY ANALYSIS OF COMPACT POWER GENERATION AND HYBRID SOLAR ENERGY-WASTE HEAT-BASED TRIPLE EFFECT EJECTOR-VAPOR ABSORPTION REFRIGERATION CYCLE

2013 ◽  
Vol 21 (04) ◽  
pp. 1350023 ◽  
Author(s):  
RAJ KUMAR ◽  
ANIL KUMAR
Keyword(s):  
Power Generation ◽  
Exergy Analysis ◽  
Waste Heat ◽  
Energy Output ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Exhaust Energy ◽  
Vapor Absorption Refrigeration

An NH 3– H 2 O ejector-absorption refrigeration cycle, and an R-152a ejector refrigeration cycle are employed with a renewable energy power generator to make a proposed compact power generation and triple effect ejector-absorption refrigeration cycle. The exergy analysis of the cycle leads to a possible performance improvement. Approximately 71.69% of the input exergy is destructed due to irreversibilities in different components. Around 7.976% is available as the useful exergy output. The exhaust exergy lost to the environment is 20.33%, which is lower than the exhaust energy loss of 47.95%, while the useful energy output is 27.88%. The refrigerants used are of zero ODP and negligible GWP, and the CO 2 emission of the exhaust gases is very small as compared to that of the fossil fuel run engine, hence, this cycle is favorable to the global environment. The results also show that the proposed cycle has significant higher energy and exergy efficiency than the earlier investigated 'triple effect refrigeration cycle' and 'the combined power and ejector-refrigeration cycle'.

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