Hello everyone, I am a first year engineering student and I am really interested in learning about refrigeration (this isn't homework its my own personal interest). I have done a bunch of research but I am a little confused on a couple of points and was hoping that you guys could help me understand them. So my first question: If I cool down the high pressure components of a refrigeration system, by say putting a block of ice on them, I know this will increase the efficiency of the system but I'm not sure about why. My initial thoughts were that there is probably a constant temperature difference between the high and low pressure sides of a refrigerator so by cooling down the high pressure parts the low pressure parts also get colder (in order to maintain the temp difference) which allows them to suck in heat faster. The things cooling down the high pressure components are doing so because they are drawing heat away from them. So by cooling down the high pressure components you are both drawing heat into and out of the refrigeration system faster. Is my understanding correct? My second question: I'm not sure about the relationship between a refrigerator's exhaust heat and the energy used to run the refrigerator's compressor. My initial thoughts were that the heat energy drawn in by a refrigerator's low pressure components should be equal to the heat energy given off by a refrigerator's high pressure components which should be equal to the energy required to run the refrigerator's compressor. This is the sort of relationship I would imagine there would be as long as the it is just as easy for the low pressure components to draw heat in as it is for the high pressure components to give off heat. Please let me know if my understanding is correct. My understanding of these two concepts may be WAY off because I don't know much about thermodynamics and I am only a first year engineering student.