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Development of a novel unbalanced ammonia-water absorption-resorption heat pump cycle for space heating

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  • Jia, Teng
  • Dai, Yanjun

Abstract

Ammonia-water absorption-resorption heat pump (ARHP) is a promising technology for promoting efficient utilization of low-temperature thermal for space heating. This paper proposes a novel unbalanced ARHP cycle by replacing the condenser and evaporator in the conventional absorption heat pump (AHP) cycle with a high-pressure absorber and a low-pressure generator, respectively. The proposed cycle can work just depending on the concentration difference of ammonia-water solution under different pressure levels. A numerical model has been developed to investigate the feasible high-pressure/low-pressure (PH/PL) values to effect the thermodynamic cycle. The cycle's coefficient of performance (COP) under different PH/PL pair values and other given working conditions are studied. The maximum COP is 1.550 and the corresponding optimum PH/PL pair to effect the cycle is 1.40 MPa/0.38 MPa at a heat source temperature of 95 °C. When PH/PL pair value is 1.40/0.38 MPa, heat supply temperature of 44.5 °C and COP value of 1.331 can be obtained, which can basically meet the temperature demand of building floor heating. In addition, effects of different PH/PL pair values on solution circulation ratios and vapor discharge scopes of generators are discussed. It is concluded that the ideal PH/PL candidates yield large concentration difference between the inlet and outlet of generators and absorbers. Meanwhile, the solution circulation ratios of the two generators at ideal PH/PL pairs are acceptable values between 2.0 and 12.0. The cycle can work when the ambient temperature is above −7.5 °C and the driving heat source temperature is larger than 85 °C, which is potential in efficient utilization of commonly used stationary solar collectors for winter heating.

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  • Jia, Teng & Dai, Yanjun, 2018. "Development of a novel unbalanced ammonia-water absorption-resorption heat pump cycle for space heating," Energy, Elsevier, vol. 161(C), pages 251-265.
    • Handle: RePEc:eee:energy:v:161:y:2018:i:c:p:251-265
    DOI: 10.1016/j.energy.2018.07.128
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    6. Jiang, L. & Wang, R.Q. & Tao, X. & Roskilly, A.P., 2020. "A hybrid resorption-compression heat transformer for energy storage and upgrade with a large temperature lift," Applied Energy, Elsevier, vol. 280(C).

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