Performance characteristics of a two-stage CO2 heat pump water heater adopting a sub-cooler vapor injection cycle at various operating conditions

Changhyun Baek, Jaehyeok Heo, Jongho Jung, Honghyun Cho, Yong Chan Kim

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The objective of this study is to investigate the performance characteristics of an injection CO2 (carbon dioxide) HPWH (heat pump water heater) at various operating conditions. In the standard and standby heat loss test conditions, the performance of a two-stage CO2 HPWH adopting a SCVI (sub-cooler vapor injection HPWH) cycle was measured and analyzed by varying the compressor frequency, the water flow rate, and the injection ratio at various outdoor temperatures. In the standard tests at the outdoor temperature of-15°C, the COP (coefficient of performance) of the optimized SCVI HPWH was 7.6% higher than that of the non-injection HPWH. During the standby loss tests at the water flow rate of 200kgh-1, the COP of the optimized SCVI HPWH was 7.1% higher than that of the non-injection HPWH.

Original languageEnglish
Pages (from-to)570-578
Number of pages9
JournalEnergy
Volume77
DOIs
Publication statusPublished - 2014 Jan 1

ASJC Scopus subject areas

  • Energy(all)
  • Pollution

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