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Measured effect of airflow and refrigerant charge on the seasonal performance of an air-source heat pump using R-410A |
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| Authors: | Larry Palmiter Ben Larson |
| Affiliation: | a Ecotope, Inc., Seattle, WA 98105, USA b School of Mechanical Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA c Building Research Council, University of Illinois, Urbana-Champaign, IL 61280, USA d School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA |
| Abstract: | The objective of this study was to measure the effects of improper airflow and refrigerant charge on the seasonal performance of a typical 10.6 kW, R-410A residential heat pump with a thermostatic expansion valve.Heating and cooling tests were performed in combinations of three refrigerant charges of 75%, 100%, and 125% of nominal value and two airflows of 75% and 100% of rated airflow. In addition, cyclic tests were performed to estimate the heating and cooling seasonal coefficient of performance (COP) at six climate zones specified by Air-Conditioning, Heating, and Refrigeration Institute (AHRI) Standard 210/240-2008. Results showed that, in each climate zone, increases in refrigerant charge at the rated airflow could improve the unit's heating seasonal COP by as much as 5%. However, combined decreases in airflow and refrigerant charge could penalize the unit's heating seasonal COP by as much as 10%. |
| Keywords: | Cd, coefficient of degradation COP, coefficient of performance IDDB, indoor dry bulb temperature HSPF, heating seasonal performance factor ODDB, outdoor dry bulb temperature ODWB, outdoor wet bulb temperature PLF, part load factor SEER, seasonal energy efficiency ratio TXV, thermostatic expansion valve |
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