Hi There Does anyone out there know a good estimate or any real values for the total heat transfer area for the hot and cold sides of a domestic refrigeration system? i.e. the sum of the areas of the evaporator and the condenser. For the Evaporator: QL=UL.AL.(TL-T1) AL=heat transfer area of cold side (Low side)=???? UL=overal heat trans. coefficient of cold side.=???? QL=heat removed from cold side = 7.93 KW TL=refrigerator temp. = 3degs C + 273.15=276.12 Kelvin T1= Refrigerant evaporating temp. =0degs C + 273.15= 273.15 Kelvin I am trying to estimate this area so I can calculate the overal heat transfer coefficient which I need for other calculations. So far the outcome of estimating the area and finding the heat transfer coefficient based on it has not been realistic. If it helps: The aim of my project is to find the optimal heat transfer ratio between hot and cold side, there is theory on this which I am following, I just need some realistic values for area and heat transfer coefficient. I think it is more logical to estimate the area and find the h.t. coefficient based on that rather than the other way around.