Refrigeration apparatus and method for a fluid dispensing device

Some embodiments of the present invention have a nozzle assembly capable of controlling pressure of comestible fluid exiting the nozzle assembly, a refrigeration system in which refrigerant pressure and temperature is controllable to enable control of comestible fluid temperature, heat exchangers connected to cool comestible fluid in the nozzles, an ultraviolet sterilization system for sterilizing locations outside and inside the system, and a hand held comestible fluid dispenser capable of cooling and selectively dispensing one of several comestible fluids supplied thereto. To improve control of comestible fluid temperature, some embodiments of the present invention have an evaporator pressure regulator to control refrigerant pressure upstream of the refrigeration system compressor and a hot gas bypass valve to control refrigerant temperature.