You recharge your automobile air conditioner with refrigerant from time to time, yet seldom, if ever, your refrigerator. Why? Would water be a suitable working fluid for use in a refrigerator? Sketch...

You recharge your automobile air conditioner with refrigerant from time to time, yet seldom, if ever, your refrigerator. Why?

Would water be a suitable working fluid for use in a refrigerator?

Sketch the T–s diagram of an ideal vapor-compression refrigeration cycle in which the heat transfer to the warm region occurs with the working fluid at a supercritical pressure.

Would you recommend a domestic heat pump for use in Duluth, Minnesota? In San Diego, California?