Construction and performance research on double-tank heat pump water heating system

Lin Lu, Caihua Liang, Xiaosong Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review


The mixing heating process of supplement water and original hot water in heat pump water heating system with single water storage tank results in the descend of water temperature in the tank, the high circulating heating temperature and the low efficiency of heat pump units.For this reason, the heat pump water heating system of double tanks(heating water-tank and heat storage tank)is introduced.The cold supplement water is heated to the setting temperature in the heating water-tank.Then it is sent to the heat storage tank by the recycling pump to supply users.It analyzes the system configuration and working principle of heat pump water system with double tanks.It is used in an air-source heat pumps heating water system of a university.The experimental study of this system results showed that the lower supplement water temperature and higher setting heating water temperature results in better energy saving effect compared with the heating pump system of single water tank.When the initial heating temperature and setting heating temperature is 14℃ and 55℃, the efficiency of double tanks system is increased by at least 19.31% than that of single tank system.
Original languageEnglish
Pages (from-to)333-339
Number of pages7
JournalHuagong Xuebao/CIESC Journal
Publication statusPublished - 1 Dec 2016
Externally publishedYes


  • COP
  • Double tanks
  • Heat pump system
  • Hydrothermal
  • Optimal design
  • Optimization

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)


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