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Experimental study of compressor modulation method effects on heat pump performance.

Number: 2428

Author(s) : ZAMAN M. A., WANG S.

Summary

Heat pump is an alternative technology to the traditional thermal heating process, which can significantly reduce carbon emissions and serve as an effective approach towards residential/industrial electrification. In many applications, the heat pump system must continuously modulate the capacity to meet fluctuating heating loads to improve the heat supply consistency and reduce the start-stop losses. The primary method of capacity control is to alter the cycle’s refrigerant flow rate, which can be done either within or outside the compressor. In this study, the effect of different compressor capacity modulations has been evaluated experimentally. The seasonal performance of R32-water-ethylene glycol (WEG) heat pump system was tested according to the standard EN 14825. Three different compressor arrangements - single speed, variable speed, and uneven tandem from the same manufacturer, were adapted. The condenser secondary fluid outlet temperature varied (35, 34, 30, 27, and 24°C) with fixed evaporator secondary fluid inlet temperature (0°C), and the system tried to achieve 100%, 88%, 54%, 34%, and 15% of part load conditions. The results showed that: the system with variable speed compressor performed better than both uneven tandem and single speed arrangements. The seasonal coefficient of performance (SCOP) of a variable speed compressor was 24% greater than that of a single speed compressor, and it was only 8% and 3% higher than that of uneven tandem modulation with a lower and higher capacity compressor, respectively. In addition, the variable speed compressor’s isentropic efficiency under full load condition was 39% and 16% greater than that of an uneven tandem and a single speed compressor, respectively, under comparable capacity and test conditions, but it falls during low compressor frequencies. On the contrary, uneven tandem configuration performed better in lower part load conditions. This work can provide insight into the heat pump system component design and performance optimization.

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  • Original title: Experimental study of compressor modulation method effects on heat pump performance.
  • Record ID : 30033133
  • 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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