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Performance analysis of heat pump water heater system operating on a new storage heat pump cycle to achieve higher operating range.

Number: 0258

Author(s) : PATEL P., ELBEL S.

Summary

Heat pump systems are often restricted to operate within a certain temperature range due to the limits on pressure ratio and discharge temperature. A new storage heat pump concept aimed at improving the operating temperature range of a heat pump system is proposed. Performance of an R134a heat pump water heater (HPWH) system with wrap-around condenser coil operating based on the new concept is studied by means of a system model. The storage heat pump cycle involves system operation in two modes to achieve the high temperature lift. In Mode I, ambient air acts as heat source for the evaporator and full length of wrap-around coil is used as condenser, whereas in Mode II, a throttling valve splits the wrap-around coil into a condenser and evaporator. Here, the intermediate temperature water in the lower tank region acts as heat source for the evaporator. This lifts up the evaporating pressure which enables the heat pump to operate at a lower pressure ratio and reach a higher water end temperature. Modeling results obtained for the storage heat pump system are also compared with a conventional HPWH system that uses back-up electric elements to reach the required water temperature when the heat pump is unable to operate.

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Pages: 12 p.

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Details

  • Original title: Performance analysis of heat pump water heater system operating on a new storage heat pump cycle to achieve higher operating range.
  • Record ID : 30031112
  • Languages: English
  • Subject: Technology
  • Source: 14th IEA Heat Pump Conference 2023, Chicago, Illinois.
  • Publication date: 2023/05/15

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