Characteristic analysis of a new wide temperature range thermoelectric dual-drive compression-absorption heat pump cycle

doi:10.3969/j.issn.2097-0706.2024.12.008

Abstract

Abstract:

Due to the wide temperature range of such waste heat， it is difficult for conventional compression heat pumps to achieve a temperature rise of more than 50 ℃， and the adaptability of absorption heat pumps to heat sources is limited. In response to this problem， a new wide temperature range thermoelectric dual-drive compression-absorption heat pump cycle was proposed， which coupled the generator in the absorption cycle with the condenser in the compression cycle to form a dual-phase heat exchanger， utilizing industrial waste heat of approximately 60 ℃ to produce high-temperature hot water or steam at around 130 ℃. The operating principle of coupled heat pump units was analyzed， a complete thermodynamic model was constructed， and simulations were conducted using EES software. The simulation results revealed the effects of waste heat outlet temperature， hot water inlet and outlet temperature， condensation temperature of the dual-phase heat exchanger， and compression ratio of the water vapor compressor on the coefficient of performance （COP）， system heating capacity， power of the two compressors， and heat exchange of each component. The optimal operating conditions were determined： when the steam compressor ratio was 6 and the condensation temperature of the dual-phase heat exchanger was 70 ℃， the cycle could heat water from 15 ℃ to 122 ℃， with a COP of 1.614. Under the premise of ensuring the performance of the unit， this cycle can increase the water temperature by up to 100 ℃ to 110 ℃， demonstrating application potential in the field of utilizing low-grade waste heat to produce high-temperature hot water or steam.

Key words: waste heat utilization, coupled heat pump cycle, compression heat pump, absorption heat pump

CLC Number:

TK115

HU Yunrong, ZHOU Liqing, JIANG Haichao, LIU Qingguo, WANG Tenghui, WANG Guoshun, SUN Jian. Characteristic analysis of a new wide temperature range thermoelectric dual-drive compression-absorption heat pump cycle[J]. Integrated Intelligent Energy, 2024, 46(12): 64-71.

Figures/Tables 15

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