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Design and analysis of a residential cold climate heat pump using a vapor injection variable speed compressor and economizer for the international refrigeration and air conditioning conference at Purdue 2024.

Number: 2344

Author(s) : SANCHEZ Y. V., ZIVIANI D.

Summary

A broad thermodynamic and heat transfer analysis is presented for a variable speed, vapor injection cold climate heat pump (VI CCHP) designed to meet the Residential Cold Climate Heat Pump Challenge from the U.S. Department of Energy’s E3 Initiative. The design is compared against a baseline non-vapor injection, non-variable speed compressor system. A case study is presented using a real-world calculated heating load at a 5 ℉ (-15 ℃) outdoor ambient temperature for an 1800 ft2 (~167 m2) residential home located in Salt Lake City, Utah (Region V). Thermodynamic performance and heat exchanger sizing are evaluated. Design levers for the VI CCHP are discussed, such as the ratio of refrigerant injection mass flow to total mass flow. R454B was chosen as the working fluid due to its burning velocity and GWP value compared to R32. The vapor injection loop introduces components such as a secondary expansion valve and economizer in addition to the components of the baseline four-component refrigeration cycle. The sizing summary indicates that a large outdoor heat exchanger is necessary to meet the heating load. The sizing of the economizer is outside this paper's scope but is recommended for future work. The VI CCHP design meets three of the Residential Cold Climate Heat Pump Challenge specifications and had a 32% increase in capacity and a 32% increase in COP compared to the baseline design. It is shown that the VI CCHP meets the load of the case study, and the improved performance results in an estimated annual energy savings of $425.35. The validity of the design in cooling mode is also presented.

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  • Original title: Design and analysis of a residential cold climate heat pump using a vapor injection variable speed compressor and economizer for the international refrigeration and air conditioning conference at Purdue 2024.
  • Record ID : 30033170
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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