Performance characteristics of a dual-evaporator heat pump system for effective dehumidifying and heating of a cabin in electric vehicles

Jae Hwan Ahn, Hoon Kang, Ho Seong Lee, Yong Chan Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

In electric vehicles, air-conditioning (AC) units and electric heaters have been used for dehumidifying and heating the cabin. However, the air heating process in the electric heater causes higher power consumption due to a lower air temperature entering the electric heater from the sensible cooling in the humidifying process. In this study, a heat pump (HP) and a dual-evaporator heat pump (DHP) combined with a heater are proposed as effective dehumidifying and heating units using waste heat recovery from the dehumidifying process. The performances of the AC, HP, and DHP systems were measured and compared by varying the indoor air wet bulb temperature and compressor speed ratio. Generally, the HP and DHP systems showed superior performance to the conventional AC system in the dehumidifying and heating operation. At the indoor air wet bulb temperature of 13. °C, the DHP system showed 53% and 62% higher specific moisture extraction rate and COP, respectively, than the HP system.

Original languageEnglish
Pages (from-to)29-37
Number of pages9
JournalApplied Energy
Volume146
DOIs
Publication statusPublished - 2015 May 5

Fingerprint

Heat pump systems
Evaporators
Electric vehicles
Air conditioning
Pumps
Heating
Air
Industrial heating
Waste heat utilization
Temperature
Compressors
Electric power utilization
Moisture
Cooling
Hot Temperature

Keywords

  • Dehumidification
  • Electric vehicle
  • Heat pump
  • Heating
  • R134a

ASJC Scopus subject areas

  • Energy(all)
  • Civil and Structural Engineering

Cite this

Performance characteristics of a dual-evaporator heat pump system for effective dehumidifying and heating of a cabin in electric vehicles. / Ahn, Jae Hwan; Kang, Hoon; Lee, Ho Seong; Kim, Yong Chan.

In: Applied Energy, Vol. 146, 05.05.2015, p. 29-37.

Research output: Contribution to journalArticle

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AU - Lee, Ho Seong

AU - Kim, Yong Chan

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N2 - In electric vehicles, air-conditioning (AC) units and electric heaters have been used for dehumidifying and heating the cabin. However, the air heating process in the electric heater causes higher power consumption due to a lower air temperature entering the electric heater from the sensible cooling in the humidifying process. In this study, a heat pump (HP) and a dual-evaporator heat pump (DHP) combined with a heater are proposed as effective dehumidifying and heating units using waste heat recovery from the dehumidifying process. The performances of the AC, HP, and DHP systems were measured and compared by varying the indoor air wet bulb temperature and compressor speed ratio. Generally, the HP and DHP systems showed superior performance to the conventional AC system in the dehumidifying and heating operation. At the indoor air wet bulb temperature of 13. °C, the DHP system showed 53% and 62% higher specific moisture extraction rate and COP, respectively, than the HP system.

AB - In electric vehicles, air-conditioning (AC) units and electric heaters have been used for dehumidifying and heating the cabin. However, the air heating process in the electric heater causes higher power consumption due to a lower air temperature entering the electric heater from the sensible cooling in the humidifying process. In this study, a heat pump (HP) and a dual-evaporator heat pump (DHP) combined with a heater are proposed as effective dehumidifying and heating units using waste heat recovery from the dehumidifying process. The performances of the AC, HP, and DHP systems were measured and compared by varying the indoor air wet bulb temperature and compressor speed ratio. Generally, the HP and DHP systems showed superior performance to the conventional AC system in the dehumidifying and heating operation. At the indoor air wet bulb temperature of 13. °C, the DHP system showed 53% and 62% higher specific moisture extraction rate and COP, respectively, than the HP system.

KW - Dehumidification

KW - Electric vehicle

KW - Heat pump

KW - Heating

KW - R134a

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