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Impacts of common faults on an air conditioner with a microtube condenser and analysis of fault characteristic features
Highlights Experimental data from an air conditioner with a microtube condenser. Installation faults’ impacts on the system performance and characteristic features. Refrigerant undercharge reduced cooling capacity up to 29%. Non-condensable gas fault reduced COP up to 14%. P-h diagrams show the effects of operating conditions and faults on the cycle.
Abstract Split system air conditioners are widely used to cool residential buildings, because of their low cost and simplicity. However, their efficiency is impacted by installation faults, which include: improper refrigerant charge (undercharge or overcharge), improper evaporator airflow, liquid line restrictions (LL), and the presence of non-condensable gas (NC) in the refrigerant. No known previously published research has studied the effect of these four faults on a system equipped with a microtube condenser, which has smaller tube size than a traditional condenser and therefore holds less refrigerant charge, but has a different configuration than a microchannel. Furthermore, very few have studied the impacts of LL and NC. This paper describes laboratory fault tests of a microtube-equipped system, compares the fault impacts with those of a traditional system, and considers the characteristic fault features. The tested system uses R-410A refrigerant and has a scroll compressor, a fixed orifice expansion device, and two fin-tube heat exchangers. The tests were carried out under steady operation with a range of fault intensities and operating conditions. The microtube system’s performance degradation from faults is similar to systems with traditional heat exchangers, despite the reduced capacity to hold refrigerant charge.
Impacts of common faults on an air conditioner with a microtube condenser and analysis of fault characteristic features
Highlights Experimental data from an air conditioner with a microtube condenser. Installation faults’ impacts on the system performance and characteristic features. Refrigerant undercharge reduced cooling capacity up to 29%. Non-condensable gas fault reduced COP up to 14%. P-h diagrams show the effects of operating conditions and faults on the cycle.
Abstract Split system air conditioners are widely used to cool residential buildings, because of their low cost and simplicity. However, their efficiency is impacted by installation faults, which include: improper refrigerant charge (undercharge or overcharge), improper evaporator airflow, liquid line restrictions (LL), and the presence of non-condensable gas (NC) in the refrigerant. No known previously published research has studied the effect of these four faults on a system equipped with a microtube condenser, which has smaller tube size than a traditional condenser and therefore holds less refrigerant charge, but has a different configuration than a microchannel. Furthermore, very few have studied the impacts of LL and NC. This paper describes laboratory fault tests of a microtube-equipped system, compares the fault impacts with those of a traditional system, and considers the characteristic fault features. The tested system uses R-410A refrigerant and has a scroll compressor, a fixed orifice expansion device, and two fin-tube heat exchangers. The tests were carried out under steady operation with a range of fault intensities and operating conditions. The microtube system’s performance degradation from faults is similar to systems with traditional heat exchangers, despite the reduced capacity to hold refrigerant charge.
Impacts of common faults on an air conditioner with a microtube condenser and analysis of fault characteristic features
Hu, Yifeng (author) / Yuill, David P. (author)
Energy and Buildings ; 254
2021-10-26
Article (Journal)
Electronic Resource
English
ACFM , actual indoor air volumetric flow rate , CH , refrigerant charge (including undercharge and overcharge) , COP , coefficient of performance , EA , evaporator airflow , EER , energy efficiency ratio , FDD , fault detection and diagnosis , FXO , fixed orifice expansion device , LL , liquid line restrictions , NC , non-condensable gas , OC , refrigerant overcharge , RTU , rooftop unit , SEER , seasonal energy efficiency ratio , SHR , sensible heat ratio , TXV , thermostatic expansion valve , UC , refrigerant undercharge , Residential air conditioner , Fault impacts , Cooling capacity , Microtube condenser , Fault characteristic features
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