ZEMCH 2015 - International Conference Proceedings | Page 698

Nomenclatures [-] Solar Collector Efficiency [-] Intercept (maximum) of the collector efficiency [kJ/h*m²*K] Slope of the efficiency curve [kJ/h*m²*K²] Curvature of the efficiency curve Radiation [kJ/h*m²] Global radiation incident on the solar collector Tin [°C] Inlet temperature of fluid to collector Tenv [°C] Ambient (air) temperature [kJ/h] The rate at which energy was removed from the chilled water flow stream [kg/h] Chilled water flow rate [kJ/kg*K] Specific heat of the chilled water stream fluid [°C] Temperature of fluid entering the chilled water stream [°C] Chilled water stream set point [0..1] Fraction of design load at which the machine is required to operate [kJ/hr] Rated cooling capacity of the device [kJ/hr] Mass flow rate of air entering the “fresh air” side of the device [0..1] Fraction of the device’s full load capacity during operation under current conditions [0..1] Fraction of the device’s nominal capacity during operation under current conditions [kJ/hr] Energy removed from the hot water stream [-] Rated Coefficient of Performance [0..1] Fraction of design energy Input currently required [°C] Temperature of fluid exiting the hot water stream [°C] Temperature of fluid entering the hot water stream [kg/hr] Mass flow rate of the hot water stream fluid [kJ/kg*K] Specific heat of the “hot water” stream fluid [°C] Temperature of fluid exiting the chilled water stream [°C] Temperature of fluid entering the chilled water stream [kg/hr] Mass flow rate of the chilled water stream fluid [kJ/kg*K] Specific heat of the chilled water stream fluid [kJ/hr] Energy draw of parasitics [°C] Temperature of fluid exiting the cooling water stream [°C] Temperature of fluid entering the cooling water stream T_Coll [°C] Working fluid solar collector temperature T_TANKout [°C] Hot storage tank temperature T_HXout [°C] Temperature of the fluid stream exiting the auxiliary heater T_FLUIDFANout [°C] Fan coil outlet fluid stream temperature T_AIRFANout [°C] Fan coil outlet air stream temperature T_BUILD [°C] Building temperature after conditioning CONDSignal [-] Conditioning signal Hot_P [kW] Chiller’s generator required power Boil_P [kW] Auxiliary heater supplied power Tank_P [kW] Hot storage fluid stream supplied power Coll_P [kW] Collector fluid stream supplied power Tank_En [kWh] Hot storage fluid stream supplied energy Boil_En [kWh] Auxiliary heater supplied energy Hot_En [kWh] Chiller’s generator required energy 696 ZEMCH 2015 | International Conference | Bari - Lecce, Italy