Rotary absorption - recompression heat pump

Riffat, Saffa; Shankland, N.; Wong, Chee‐Woon

doi:10.1177/014362449401500105

Cited by 6 publications

(1 citation statement)

References 2 publications

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“…There are different kinds of configurations for the hybrid compressor-assisted absorption cycle according to the location of the compressor 18 : (1) parallel configuration: the mechanical compressor is located in parallel with the thermochemical compressor, in which the compression is used either as an extra refrigerant source or for heat production, eliminating the condenser and evaporator; 21,22 (2) series configuration: the mechanical compressor is positioned in the vapor circuit, either between the generator and condenser (called high-pressure booster) 22,23 or between the evaporator and absorber (called low-pressure booster). 24 For the parallel configuration, the electricity consumption of compressor is relatively large due to its high pressure ratio.…”

Section: System and Principle Descriptionmentioning

confidence: 99%

Performance improvement of ammonia/absorbent air source absorption heat pump in cold regions

Wang

Shi

et al. 2013

Building Services Engineering Research and Technology

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Air source absorption heat pump is promising in energy saving and emission reduction of heating and domestic hot water, but performs badly or even cannot work in cold climate. The ammonia/absorbent air source absorption heat pump with low-pressure boosting is proposed to solve the problem. The hybrid air source absorption heat pump + compressor system is modeled and the compression ratio is optimized to obtain maximum primary energy efficiency. The integrated system is simulated with air temperature ranging from −30℃ to 10℃ and hot water temperature from 30℃ to 60℃. Comparative simulations on three working fluids reveal that NH3–LiNO3 system has the lowest compression ratio and the highest primary energy efficiency value. By pressure boosting, the air source absorption heat pump can operate under air temperatures as low as −30℃. Primary energy efficiency of the hybrid system is about 15–50% higher than that of coal boiler, showing great potential for heat supply in cold regions. Practical application: Heating and domestic hot water consumes a large amount of energy every year. Air source absorption heat pump can be a potential alternative to the traditional boiler systems in the point view of primary energy efficiency. However, air source absorption heat pump performs badly or cannot work when the air temperature is low. This paper presents a hybrid air source absorption heat pump with pressure boosting to improve the performance of the air source absorption heat pump heating system, making it operate under lower outdoor air temperatures with higher primary energy efficiency. The novel heat supply system is expected to make contributions to building energy saving as well as pollution reduction.

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