This answer needs to be elaborated with the help of diagrams and unfortunately we cannot draw or attach images or files here. There are various Characteristics that affect the resistance ti heat transfer in refrigerators. They include Refrigerant mass flow rate and refrigerent properties.The heat transfer resistance might change more than 10% in 2 phase region of the evaporator and around 20% in the superheated region. And you also need to take the properties of refrigerant into consideration. We would suggest you to go through this journal for elaborated information https://core.ac.uk/download/pdf/4819047.pdf . This is a thesis submitted on heat transfers in refrigerator condensors and so might help you.