Refrigeration

No. I don't think I've ever seen it hold true. Horsepower is a measure of power while ton of refrigeration is a measure of energy. The equivalence between them is therefore dependant on the efficiency of the unit.

yes, for the same refrigerant, at the same low side pressure and the same high side pressure.

The HP per ton (12,000 BTU/hr) requirement for refrigeration is a function the suction pressure and discharge pressure of the compressor. If you want colder temperatures, the suction pressure is lowered and the low suction pressure means the compressor does more work which is more HP/ton. see boiling point of refrigerants.

The discharge pressure is a function of the temperature of the condensor. The hotter the condensing medium, water or air typically, the higher the discharge pressure and the larger the HP/ton. See condensing point of refrigerants

both terms are unconnected.the cooling capacity of the unit will depend on pressures at low and high side,refrigerant,condenser/evaporator capacity and efficiency along with power.

no . it cannot hold good always , only in the intermediate stages it may satisfy but wen we talk about extreme conditions we find opposite signs,

mostly HP is used in case of heat engines and ton in case of refrigeration

Hi

Firstly, ton of refrigeration as hp is a unit of power (ton = 12000 btu/hr = 3.517 KW = 4.75 hp)

Secondly,in refrigeration systems usually we talk about compressor capacity in hp or KW and about evaporator capacity in ton or btu/hr from here comfuion takes place.

the relation between them is c.o.p.(coefficient of performance)

c.o.p. = evaporator capacity/compressor capacity (two items must be as the same units) which is different from one system to another.

Note : the required copressor capacity is not depend on the suction pressure and discharge pressure only but also it depends on the heat loads which affected on the refrigerated space so, we use a copressor for a certain space and a larger one for another space works at the same suction and discharge pressure.