Abstract
The external ventilation conditions have a great influence on the heating performance of the air source heat pump (ASHP) systems. The outdoor units of residential household air source heat pumps are often installed in narrow spaces such as balconies. The ventilation conditions of the outdoor unit will influent the heating performance of the air source heat pump. It is necessary to study the effect of the outdoor unit ventilation conditions on the heating performance of residential household heat pumps. This paper experimentally studied the heating performances of an air source heat pump system with the outdoor unit mounted in a balcony in different external ventilation conditions. The results indicate that the ventilation conditions for the outdoor units have a significant effect on the heating performance of the system. When the inlet of the outdoor unit was close to the sliding door and completely blocked, the ventilation environment was the worst and the coefficient of performance (COP) was the lowest. In addition, the unfavorable ventilation environment could result in a reduction of the COP by 26.2%. When the inlet of the outdoor unit was partially blocked, the heating performance could be improved and the COP was also slightly improved. The great heating performance was obtained under the cross-ventilation condition. This paper can guide the design of the installation position of the household air source heat pump outdoor units in actual engineering.
Highlights
Reducing building energy consumption and using renewable energy are two important methods to decrease greenhouse gas emissions
Under the results of the 7 conditions, Figures 6–12 respectively show the variations of the coefficient of performance (COP) of the heating system and the outdoor air temperature variations under conditions 1 to 7
The ventilation conditions of the outdoor unit have a significant influence on the COP of the heating system of the household air source heat pump (ASHP) system
Summary
Reducing building energy consumption and using renewable energy are two important methods to decrease greenhouse gas emissions. Bertsch and Groll (2008) designed and constructed a breadboard system They tested a twostage ASHP for water and air heating, and the two-stage ASHP outperforms most currently available commercial single-stage ASHPs. In summary, research on ASHP heating mainly focuses on heat pump unit performance and composite heat source heating (Busato et al, 2013; Hakkaki-Fard et al, 2014; Redón et al, 2014) and has witnessed many breakthroughs and progress in unit load rate, outdoor temperature, and energy saving potential of multi-energy complementary systems (Zhao et al, 2007; Madonna and Bazzocchi, 2013; Wu et al, 2013; Dongellini et al, 2015). In this experiment, the heat recovery type ASHP unit, HSLR-T-13 (D) E, is selected as the cold and heat source of the system. The ASHP produces hot water which the fan coils use to heat the indoor air through convection heat transfer
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