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Experimental results of density controlled phase change material capsules for increased first hour rating for heat pump water heaters (case study).

Number: 2241

Author(s) : RENDALL J., NAWAZ K., ASHER W., BRECHTL J., ELATAR A., LI K., YANG C.-M., SUN J., GEHL T.

Summary

To improve the capacity of heat pump water heaters, which nominally perform similar to electric resistance water heaters, high energy density PCM was included in a HPWH prototype. Initial results indicate that over a small temperature difference the PCM energy can effective be exchanged to increase the capacity of hot water above a desired cut-off temperature. This increases the amount of water hot enough for mixing at the location of use by the consumer. An industry standard capacity-based test was conducted showing an average of 27.7% increase in capacity of a wrapped heat pump water heater when novel capsules were filled with phase change material an added inside a secondary tank. The substantial increase in capacity was two-fold, firstly, the design of the capsules allowed for high utilization of the high energy density phase change storage and secondly the additional tank has a nominal volume. Food grade paraffin’s were selected as appropriate for use in domestic hot water heating. The novel encapsulation design attacked the deficiencies of paraffin based PCMs increasing the effective conductivity inside and outside of the capsule.

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  • Original title: Experimental results of density controlled phase change material capsules for increased first hour rating for heat pump water heaters (case study).
  • Record ID : 30030623
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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