Final answer:
A schematic diagram of an ammonia vapor-compression cycle includes an evaporator, a compressor, a condenser, and an expansion valve.
Step-by-step explanation:
A schematic diagram of an ammonia vapor-compression cycle typically includes four main components: an evaporator, a compressor, a condenser, and an expansion valve. The cycle starts with the evaporation of the ammonia refrigerant at a low temperature and pressure in the evaporator.
The compressor then increases the pressure and temperature of the refrigerant, which is then condensed into a liquid state in the condenser. Finally, the expansion valve reduces the pressure of the liquid refrigerant, allowing it to evaporate and absorb heat from the surroundings, thus repeating the cycle.