Refrigerant Charge Imbalance in a Mobile Reversible Air Conditioning-Heat Pump System

Lili Feng; Predrag Stojan Hrnjak

doi:10.4271/2017-01-0177

Refrigerant Charge Imbalance in a Mobile Reversible Air Conditioning-Heat Pump System

Lili Feng, Predrag Stojan Hrnjak

Mechanical Science and Engineering

Research output: Contribution to journal › Conference article › peer-review

Abstract

This paper presents the study of refrigerant charge imbalance between A/C (cooling) mode and HP (heating) mode of a mobile reversible system. Sensitivities of cooling and heating capacity and energy efficiency with respect to refrigerant charge were investigated. Optimum refrigerant charge level for A/C mode was found to be larger than that for HP mode, primarily due to larger condenser size in A/C mode. Refrigerant charge retention in components at both modes were measured in the lab by quick close valve method. Modeling of charge retention in heat exchangers was compared to experimental measurements. Effect of charge imbalance on oil circulation was also discussed.

Original language	English (US)
Journal	SAE Technical Papers
Volume	2017-March
Issue number	March
DOIs	https://doi.org/10.4271/2017-01-0177
State	Published - Mar 28 2017
Event	SAE World Congress Experience, WCX 2017 - Detroit, United States Duration: Apr 4 2017 → Apr 6 2017

ASJC Scopus subject areas

Automotive Engineering
Safety, Risk, Reliability and Quality
Pollution
Industrial and Manufacturing Engineering

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abstract = "This paper presents the study of refrigerant charge imbalance between A/C (cooling) mode and HP (heating) mode of a mobile reversible system. Sensitivities of cooling and heating capacity and energy efficiency with respect to refrigerant charge were investigated. Optimum refrigerant charge level for A/C mode was found to be larger than that for HP mode, primarily due to larger condenser size in A/C mode. Refrigerant charge retention in components at both modes were measured in the lab by quick close valve method. Modeling of charge retention in heat exchangers was compared to experimental measurements. Effect of charge imbalance on oil circulation was also discussed.",

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