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Q_dot_cond=m_dot_ref*(h_3.35-h_3.7) Q_dot_cond=m_dot_water*cp_water*delta_T_water_cond Q_dot_cond=UA_cond*LMTD_cond {Single phase subcooling stage from T3.7 to T4} {---------------------------------------------------------------------} delta_sub_in=T_4-T_water_in (delta_sub_in/delta_cond_in)=exp((delta_sub_in-delta_cond_in)/LMTD_sub) Q_dot_sub=m_dot_ref*(h_3.7-h_4) Q_dot_sub=m_dot_water*cp_water*delta_T_water_sub Q_dot_sub=UA_sub*LMTD_sub Q_dot_1=Q_dot_des+Q_dot_cond+Q_dot_sub {heating capacity} COP_1=Q_dot_1/E_dot_comp "Compressor" {------------------------------------------------------------------------------------------------------------------- } eta_is=0.0024*P_ratio^3-0.0363*P_ratio^2+0.1377*P_ratio+0.5531 eta_s=0.0015*P_ratio^2-0.0356*P_ratio+1.0583 rho_ref_2=Density(R410A,h=h_2,P=P_evap) {density of refrigerant at inlet of compressor} m_dot_ref=rho_ref_2*V_dot_swept*eta_s E_dot_comp=m_dot_ref*(h_3-h_2) {Total power input to the compressor} delta_P=((m_dot_ref/0.00018727)^2)/(2*Rho_1)*((1-1.4829^2+(0.42*(1-1.4289^2)^2))+ 4*1.2028*(Rho_1/Rho_m)+2*(Rho_1/Rho_2-1)-((1-0.51074^2-(1-0.51074)^2)*(Rho_1/Rho_2))) "SCOP calculation" {-----------------------------------------------------------------------------------------------------------} heating_season_tot= 6446 COP_partial=COP_1*hj/heating_season_tot SCOP=SumParametric('SCOP_Rad','COP_partial') SCOP=SumParametric('SCOP_Floor','COP_partial') -vi-PDF Image | Next generation of refrigerants for residential heat pump systems
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