Refrigeration and Air Conditioning
The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration

0.5 to 0.8 h.p. per ton of refrigeration
2 to 5 h.p. per ton of refrigeration
0.1 to 0.5 h.p. per ton of refrigeration
1 to 2 h.p. per ton of refrigeration

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Refrigeration and Air Conditioning
A thermostatic expansion valve in a refrigeration system

Is suitable only for constant load systems
None of these
Ensures the evaporator completely filled with refrigerant of the load
Maintains different temperatures in evaporator in proportion to load

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