فرمولهای مهم

Equations 

 01-Cooling and Heating Equations

HS =1.08 ×CFM ×∆T
HS =1.1 ×CFM ×∆T
HL =0.68 ×CFM ×∆WGR.
HL =4840 ×CFM ×∆WLB.
HT =4.5 ×CFM ×∆h
HT =HS +HL
H =U ×A ×∆T
SHR = HS/HT=HS/(HS+HL)
LB. STM/HR = (BTU/HR )/HFG

HS = Sensible Heat (Btu/Hr.)        

HL = Latent Heat (Btu/Hr.)  

HT = Total Heat (Btu/Hr.)
∆T = Temperature Difference (°F.)
∆WGR. = Humidity Ratio Difference (Gr.H2O/Lb.DA)

∆WLB. = Humidity Ratio Difference (Lb.H2O/Lb.DA)
∆h = Enthalpy Difference (Btu/Lb.DA)

CFM = Air Flow Rate (Cubic Feet per Minute)

U = U-Value (Btu/Hr. Sq. Ft. °F.)

A = Area (Sq. Ft.) SHR = Sensible Heat Ratio
HFG = Latent Heat of Vaporization at Design Pressure (1989 ASHRAE Fundamentals)