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Vapor injection compressors: a review of opportunities, testing and sampling techniques, and methods of characterization.

Number: 1142

Author(s) : KIM T., NASUTA D., DESHPANDE S., LI S., MARTIN C.

Summary

In the race to fight climate change and live sustainably, heat pumps are becoming increasingly popular due to their ability to efficiently deliver heat using electricity. However, heat pump performance degrades at low ambient conditions, making implementation challenging in very cold climates. The introduction of vapor injection (VI) has been seen in experimental research to improve capacity and coefficient of performance (COP), especially at low ambient conditions with heat pumps. While the performance of such compressors is heavily researched, the industry still has no standardized practices for characterizing their performance. Currently, there are standard practices for testing VI compressors according to ASHRAE 23 and EN 13771 but rating standards do not provide specific guidance on the selection of test points and the fitting of data. Empirical models, such as AHRI Standard 540’s 10-coefficient model, exist for fitting the data of non-VI compressors, but there is no equivalent model established for VI compressors. In order to incorporate the effects of additional varying parameters such as injection pressure, compressor frequency, superheat, and ambient temperature, new techniques for sampling and fitting data will be necessary since a fully empirical polynomial approach would require far too many tests and variables. This paper reviews the current practices/methods for compressor test sampling and performance mapping in academia for both VI and non-VI compressors. Accurate and reliable compressor performance mapping for VI will be important for the design and implementation of such compressors in HVAC equipment in the coming years. The authors are engaged in a multi-year research program funded by the Department of Energy and future work will include the construction of a compressor test stand that will be used to evaluate best practices for testing and characterizing VI compressor performance.

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  • Original title: Vapor injection compressors: a review of opportunities, testing and sampling techniques, and methods of characterization.
  • Record ID : 30033005
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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