To address the high energy consumption issue in the regeneration of antifreeze for heat source tower heat pump, a low-temperature vacuum solution regeneration system based on heat pump was designed and constructed, and experimental research on its regeneration characteristics was carried out. The results show that the optimal evaporation temperature and condensation temperature of the heat pump are 30 ℃ and 55 ℃respectively under the design conditions. During the regeneration process, the water production rate of the system increased by 2 percentage points when the solution filling amount increased from 20 kg to 80 kg. When the solution concentration increased from 10% to 30%, the water production rate of the system decreased by 1.2 percentage points. When the vacuum degree increases from 84% to 93%, the water production rate of the system increases by 47.3 percentage points. The system can operate continuously and stably, with daily water production of 1.4 t and unit energy consumption evaporation of 6.33 kg/(kW·h). The research conclusion can provide reference for low energy consumption and high efficiency regeneration of solutions.
LILei, ZHANGHuafu, ZHANGZhentao, et al. Research status and development trend of open type heat source tower technology[J]. Thermal Power Generation, 2024, 53(11): 66-78.
ZHAOShanguo, ZHANGXiaosong, LIANGCaihua, et al. Operation efficiency performance of multi-mode regeneration heating tower heat pump system[J]. Acta Energiae Solaris Sinica, 2023, 44(7): 107-115.
[6]
ZHUL T, WANGL B, LINGY Z, et al. Performance analysis and comparison of five solution regeneration methods for frost-free air-source heat pump[J]. Journal of Building Engineering, 2025, 99: 111548.
TONGShoubao, CHEChunwen, YINYonggao. Experimental study on dehumidification and regeneration performance and corrosiveness of CaBr2 solution[J]. Journal of Southeast University (Natural Science Edition), 2022, 52(3): 425-432.
JIANGYue, CHENGuansheng, LIULiangde, et al. An experimental research of the heat absorption and regeneration performance of the solar powered solution regenerator[J]. Journal of Guangdong University of Technology, 2020, 37(4): 79-83.
[11]
HANC, JIANGH M, YAOY, et al. Experimental investigation on the feasibility of a solution regenerator unit using freeze concentration for heat source tower heat pump system[J]. Energy and Buildings, 2023, 284: 112864.
[12]
CHENGQ, WANGH, LIUL. An ion mass transfer model of electrodialysis regenerator for inorganic salt liquid desiccants[J]. Energy, 2022, 239: 122432.
CAOXianqi, WENXiantai, WUShuang. Experimental study on freezing regeneration of salt solution in heat source tower[J]. Refrigeration and Air-Conditioning, 2019, 19(12): 61-65.
PENGDonggen, ZHANZhentong. Energy and exergy analysis of solar solution grading collector/regenerator system with heat recovery[J]. Acta Energiae Solaris Sinica, 2023, 44(9): 241-248.
WUFan, CHANGRu, WEIJincai. Experimental study on control variable combination condition of internally heated solution regenerator[J]. Journal of Tianjin Chengjian University, 2023, 29(1): 26-30.
WUDongxu, CHENGMinghao, ZHANGXiaosong. Experimental study on desiccant regeneration driven by solar interfacial evaporation[J]. Acta Energiae Solaris Sinica, 2024, 45(7): 607-611.
WANGYiwen, JIANGQinliang, LIJianxin, et al. Research progress on the application of integrated electrodialysis technology in high salt wastewater treatment[J]. Technology of Water Treatment, 2023, 49(12): 22-28.
[23]
WANGW H, LIF, LIUJ, et al. A bipolar membrane electrodialysis metathesis process for N-methyldiethanolamine regeneration, sulfate high-value conversion and resourcelization of NH4Cl wastewater[J]. Desalination, 2025, 602: 118600.
[24]
VALLEJO CASTAÑOS, SHUQ D, SHIM, et al. Optimizing alkaline solvent regeneration through bipolar membrane electrodialysis for carbon capture[J]. Chemical Engineering Journal, 2024, 488: 150870.
[25]
PEIW, CHENGQ, JIAOS, et al. Performance evaluation of the electrodialysis regenerator for the lithium bromide solution with high concentration in the liquid desiccant air-conditioning system[J]. Energy, 2019, 187: 115928.
[26]
GAOW Z, QIJ Y, ZHANGJ H, et al. An experimental study on explosive boiling of superheated droplets in vacuum spray flash evaporation[J]. International Journal of Heat and Mass Transfer, 2019, 144: 118552.
LIDa, LIANGCaihua, JIANGDongmei, et al. Research on performance of low pressure boiling solution regeneration device of heat-source tower heat pump[J]. Chinese Journal of Refrigeration Technology, 2017, 37(2): 25-31.
ZHANGGuohui, WANGLi, CUIHaijiao, et al. Construction and thermal performance analysis of heat-source tower heat pump system based on low-temperature multi-effect distillation and regeneration[J]. Journal of Zhejiang Sci-Tech University (Natural Sciences), 2021, 45(4): 565-574.
[31]
HANC, CHENX Z, WUS S, et al. Experimental investigation on heating performance of a solution regenerator unit using freezing concentration for heat source tower heat pump system[J]. Energy and Buildings, 2024, 312: 114166.
LUZhu, XULichong. The current status and prospect of freezing desalination technology[J]. Technology of Water Treatment, 1994, 20(3): 140-145.
[34]
魏留柱. 热泵式海水淡化装置设计与实验研究[D]. 重庆: 重庆大学, 2016: 20-40.
[35]
FANL K, YUANL, GENGS B, et al. Experimental study on the optimal running of the refrigeration dehumidifier with variable air volume[J]. Applied Mechanics and Materials, 2012, 271/272: 645-649.
[36]
CONDEM R. Properties of aqueous solutions of lithium and calcium chlorides: formulations for use in air conditioning equipment design[J]. International Journal of Thermal Sciences, 2004, 43(4): 367-382.