On the basis of the second law of thermodynamics and the principle of the thermotechnical economics,a new method and the relevant evaluating index,the radiating exergy cost price,are presented,which can be used to make overall and rational evaluation of the radiating equipment used for heating.

Practice of Reducing Air Conditioning System Energy Consumption through Equipment Carry-off Heat;

Where the cooling load is dominant,when the supplemental heat rejected facility is utilized,the system efficiency improves and the cost decreases on condition that the ratio of cooling load to heat-ing load is more than two.