Aiming at the technical problem of limited temperature range in the application of conventional heat pump in the field of industrial waste heat utilization, this paper studies the production of about 130 ℃ hot water or steam by a compression-absorption coupled heat pump systems under the condition of large temperature rise. In this paper, the operation principle of coupled heat pump cycle is introduced, and the complete thermodynamic model of coupled heat pump is constructed. Through the optimization function calculation of EES software, it is found that the lower the absorption side pressure is, the better the cycle COP is. At the same time, under the constraint conditions that the temperature of concentrated solution at the outlet of solution heat exchangers is 10 ℃ higher than the crystallization temperature and the range of solution steam discharge is 5.0%-5.5%, taking an industrial waste heat recovery condition as the design condition, the results show that the inlet and outlet temperature of waste heat hot water is 90/75 ℃, the flow rate of residual hot water is 30 kg/s, the inlet and outlet temperature of high temperature hot water is 100/125 ℃, the optimal pressure values of absorption and generation side are 40 kPa and 2.2 kPa respectively, and the COP of the corresponding coupled heat pump is 9.8. In the same way, the cycle performance of the system with different outlet temperature of waste heat hot water and high temperature hot water outlet is analyzed, and it is verified that the cycle still has good virtual performance coefficient at high heating temperature.
Key words
waste heat utilization /
heat pump systems /
heat exchangers /
coupled heat pump cycle
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