The present paper aims at exploring a hybrid absorption-compression heat pump (HAC-HP) to upgrade and recover the industrial waste heat in the temperature range of 60°C–120°C. The new HAC-HP system proposed has a condenser, an evaporator, and one more solution pump, compared to the conventional HAC-HP system, to allow flexible utilization of energy sources of electricity and waste heat. In the system proposed, the pressure of ammonia-water vapor desorbed in the generator can be elevated by two routes; one is via the compression of compressor while the other is via the condenser, the solution pump, and the evaporator. The results show that more ammonia-water vapor flowing through the compressor leads to a substantial higher energy efficiency due to the higher quality of electricity, however, only a slight change on the system exergy efficiency is noticed. The temperature lift increases with the increasing system recirculation flow ratio, however, the system energy and exergy efficiencies drop towards zero. The suitable operation ranges of HAC-HP are recommended for the waste heat at 60°C, 80°C, 100°C, and 120°C. The recirculation flow ratio should be lower than 9, 6, 5, and 4 respectively for these waste heat, while the temperature lifts are in the range of 9.8°C–27.7 °C, 14.9°C–44.1 °C, 24.4°C–64.1°C, and 40.7°C–85.7°C, respectively, and the system energy efficiency are 0.35–0.93, 0.32–0.90, 0.25–0.85, and 0.14–0.76.
. [J]. Frontiers in Energy, 2017, 11(4): 503-509.
Zhiwei MA, Huashan BAO, Anthony Paul ROSKILLY. Numerical study of a hybrid absorption-compression high temperature heat pump for industrial waste heat recovery. Front. Energy, 2017, 11(4): 503-509.
Vélez F, Segovia J J, Martin M C, Antolin G, Chejne F , Quijano A . A technical, economical and market review of organic Rankine cycles for the conversion of low grade heat for power generation. Renewable & Sustainable Energy Reviews, 2012, 16(6): 4175–4189 https://doi.org/10.1016/j.rser.2012.03.022
2
Zhai X Q, Qu M, Li Y , Wang R Z . A review for research and new design options of solar absorption cooling systems. Renewable & Sustainable Energy Reviews, 2011, 15(9): 4416–4423 https://doi.org/10.1016/j.rser.2011.06.016
3
Li T X, Wang R Z, Li H. Progress in the development of solid-gas sorption refrigeration thermodynamic cycle driven by low-grade thermal energy. Progress in Energy and Combustion Science, 2014, 40: 1–58 https://doi.org/10.1016/j.pecs.2013.09.002
4
Oluleye G, Smith R, Jobson M . Modelling and screening heat pump options for the exploitation of low grade waste heat in process site. Applied Energy, 2016, 169: 267–286 https://doi.org/10.1016/j.apenergy.2016.02.015
Brunin O, Feidt M, Hivet B . Comparison of the working domains of some compression heat pumps and a compression-absorption heat pump. International Journal of Refrigeration, 1997, 20(5): 308–318 https://doi.org/10.1016/S0140-7007(97)00025-X
7
Hultén M, Berntsson T. The compression/absorption cycle—influence of some major parameters on COP and a comparison with the compression cycle. International Journal of Refrigeration, 1999, 22(2): 91–106 https://doi.org/10.1016/S0140-7007(98)00047-4
8
Minea V, Chiriac F. Hybrid absorption heat pump with ammonia/water mixture—some design guidelines and district heating application. International Journal of Refrigeration, 2006, 29(7): 1080–1091 https://doi.org/10.1016/j.ijrefrig.2006.03.007
9
Kim J, Park S R, Baik Y J, Chang K C, Ra H S, Kim M, Kim C . Experimental study of operating characteristics of compression/absorption high-temperature hybrid heat pump using waste heat. Renewable Energy, 2013, 54: 13–19 https://doi.org/10.1016/j.renene.2012.09.032
10
Jensen J K, Markussen W B, Reinholdt L, Elmegaard B . On the development of high temperature ammonia-water hybrid absorption-compression heat pumps. International Journal of Refrigeration, 2015, 58: 79–89 https://doi.org/10.1016/j.ijrefrig.2015.06.006
11
Jensen J K, Markussen W B, Reinholdt L, Elmegaard B . Exergoeconomic optimization of an ammonia-water hybrid absorption-compression heat pump for heat supply in a spray-drying facility. International Journal of Environmental Engineering, 2015, 6: 195–211
12
Bourouis M, Nogues M, Boer D , Coronas A . Industrial heat recovery by absorption/compression heat pump using TFE-H2O-TEGDME working mixture. Applied Thermal Engineering, 2000, 20(4): 355–369 https://doi.org/10.1016/S1359-4311(99)00023-X
13
El-sayed Y M, Tribus M. Thermodynamic properties of water-ammonia mixtures theoretical implementation for use in power cycles analysis. American Society of Mechanical Engineers, Advanced Energy Systems Division (Publication), 1985, 1: 89–95
Herold K E, Radermacher R, Klein S A . Absorption Chillers and Heat Pumps. Boca Raton: CRC Press, 1996
16
Wu W, Wang B L, Shi W X, Li X T. Performance improvement of ammonia/absorbent air source absorption heat pump in cold regions. Building Services Engineering Research and Technology, 2014, 35(5): 451–464 https://doi.org/10.1177/0143624413505750
17
Kandlikar S. A new absorber heat recovery cycle to improve COP of aqua-ammonia absorption refrigeration system. Ashrae Transactions, 1982, 88: 141–158
