Nomenclature</h5> A 1 , A 2 surface area of various components in greenhouse (m 2 )</P>A c collector surface area (m 2 )</P>COP hp heating coefficient of performance of heat pump</P>COP sys heating coefficient of performance of overall system</P>C p , wa specific heat of water-antifreeze solution (kJ kg −1 K −1 )</P>f c construction type or quality factor for greenhouse</P>f s system factor for greenhouse</P>f w wind or exposure factor for greenhouse</P>F R solar collector heat removal factor</P>H monthly average daily radiation on a horizontal surface (MJ m −2 )</P>H o monthly average daily extraterrestrial radiation (MJ m −2 )</P>h con , i specific enthalpy of refrigerant entering condenser (kJ kg −1 )</P>h con , o specific enthalpy of refrigerant leaving condenser (kJ kg −1 )</P>h eva , i specific enthalpy of refrigerant entering evaporator (kJ kg −1 )</P>h eva , o specific enthalpy of refrigerant leaving evaporator (kJ kg −1 )</P>h comp , i specific enthalpy of refrigerant entering compressor (kJ kg −1 )</P>h comp , o specific enthalpy of refrigerant leaving compressor (kJ kg −1 )</P>I b direct solar radiation arriving on a horizontal surface (MJ m −2 )</P>I d instantaneous diffuse solar radiation on
Energy and Buildings – Elsevier
Published: Oct 1, 2013
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