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Study of charge optimization and compressor modulation strategies effect on the seasonal performance in A R410A chiller.

Number: 1199

Author(s) : INAMPUDI S. T., ELBEL S.

Summary

There are new restrictions on high GWP refrigerants. Due to this, there is an increased focus on the amount of refrigerant used in HVAC&R systems. The optimum charge is determined at the nominal operating conditions and the same charge is used at part load conditions. There have been several studies that predict a decrease in system performance when not operating at the optimum charge. Also, there is a demand for higher SEER HVAC systems in the USA due to new DOE requirements. In the current study, a single speed and variable speed compressor are tested in a R410A water ethylene glycol (WEG) chiller according to the AHRI 551/591 (2020) standard. The chiller has a condenser, followed by a receiver and a dedicated subcooler. This standard specifies the required operating conditions at four test points (A, B, C, and D) to estimate the seasonal performance. Charge optimization was done for both these compressors at the highest rating condition (A) and part load condition (C). Both the compressor exhibits a peak in COP at a charge when the receiver is empty, and this peak was more pronounced for variable speed compressor at part load conditions. The possible reason for this peak in COP is investigated and the effect of condenser and subcooler size on the charge optimization in a dedicated subcooler system is also studied. Based on the experimental results, the difference in the order of 5% in IPLVS.SI is found when comparing optimum charge and non-optimum charge in a variable speed compressor.

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  • Original title: Study of charge optimization and compressor modulation strategies effect on the seasonal performance in A R410A chiller.
  • Record ID : 30030281
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15

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