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Study of a conventional heat pump water heater system for implementation of a new storage heat pump concept.

Number: 2257

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

Summary

Heat Pump Water Heater (HPWH) systems can help achieve decarbonization goals while providing a method to heat water that outperforms electric resistance heating in terms of energy efficiency. Nevertheless, vapor compression systems are restricted to operate within the compressor envelope, to protect the compressor from excessive pressure ratios and discharge temperature that could damage the equipment.
This paper presents the experimental study of a R134a HPWH system. The experimental facility used is a residential HPWH unit, which contains a finned-tube evaporator, a low-pressure side accumulator, a rotary compressor, an electronic expansion valve, a wrap-around coil condenser, and a water tank. Tests are carried out with water in warm-up condition where the water is heated to a set point temperature without any water draw from the system. The experimental facility is placed in an environmental chamber where a PID-controlled heater is used to maintain a constant ambient temperature.
A new storage heat pump cycle that aims to improve the operating temperature range of the conventional heat pump system by the means of energy storage at an intermediate temperature level is also discussed. Implementation of the new concept would require a split-condenser design and the system operation in two different modes to achieve the higher operating temperature range. The experimental results obtained for the conventional system can be used in evaluating the performance of the new system and determining its applicability when compared to the conventional system.

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Details

  • Original title: Study of a conventional heat pump water heater system for implementation of a new storage heat pump concept.
  • Record ID : 30030631
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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