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

doi:10.1016/j.energy.2014.09.038

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

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

40 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 language	English
Pages (from-to)	570-578
Number of pages	9
Journal	Energy
Volume	77
DOIs	https://doi.org/10.1016/j.energy.2014.09.038
Publication status	Published - 2014 Jan 1

ASJC Scopus subject areas

Energy(all)
Pollution

Access to Document

10.1016/j.energy.2014.09.038

Fingerprint Dive into the research topics of 'Performance characteristics of a two-stage CO<sub>2</sub> heat pump water heater adopting a sub-cooler vapor injection cycle at various operating conditions'. Together they form a unique fingerprint.

Cite this

@article{f4087c42adf04c66bbfaadb85bfcff1b,

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

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.",

keywords = "CO heat pump water heater, Hot water temperature, Injection ratio, Vapor injection, Water heating performance",

author = "Changhyun Baek and Jaehyeok Heo and Jongho Jung and Honghyun Cho and Kim, {Yong Chan}",

year = "2014",

month = jan,

day = "1",

doi = "10.1016/j.energy.2014.09.038",

language = "English",

volume = "77",

pages = "570--578",

journal = "Energy",

issn = "0360-5442",

publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Performance characteristics of a two-stage CO2 heat pump water heater adopting a sub-cooler vapor injection cycle at various operating conditions

AU - Baek, Changhyun

AU - Heo, Jaehyeok

AU - Jung, Jongho

AU - Cho, Honghyun

AU - Kim, Yong Chan

PY - 2014/1/1

Y1 - 2014/1/1

N2 - 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.

AB - 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.

KW - CO heat pump water heater

KW - Hot water temperature

KW - Injection ratio

KW - Vapor injection

KW - Water heating performance

UR - http://www.scopus.com/inward/record.url?scp=84909986656&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84909986656&partnerID=8YFLogxK

U2 - 10.1016/j.energy.2014.09.038

DO - 10.1016/j.energy.2014.09.038

M3 - Article

AN - SCOPUS:84909986656

VL - 77

SP - 570

EP - 578

JO - Energy

JF - Energy

SN - 0360-5442