Patent ID: 9644906
Date: 2017-05-09
CPC Classifications: F24F,F25B,F25D,F28F

Claim:
1. A method for selecting a heat medium of each of a plurality of use side heat exchangers in installing an air-conditioning system in which a plurality of spaces are air-conditioning spaces and two types of circulation heat media including a refrigerant and a nontoxic medium are allowed to coexist as the circulation heat media of a use side heat exchanger installed in each of the plurality of spaces, the method comprising: a first step of determining power required for the use side heat exchanger assuming that the refrigerant is used and corresponding to each air-conditioned space; a second step of calculating a total refrigerant amount required when the refrigerant is circulated through all the use side heat exchangers having the determined power; a third step of calculating a refrigerant concentration when the total refrigerant amount leaks to each air-conditioned space using the refrigerant, for each air-conditioned space; a fourth step of determining whether or not the refrigerant concentration for each air-conditioned space exceeds a predetermined limit concentration; a fifth step of, when there are any air-conditioned spaces exceeding the limit concentration in the fourth step, selecting the nontoxic medium as the circulation heat medium of a use side heat exchanger installed in one of the air-conditioned spaces; and a sixth step of calculating a total refrigerant amount required when the refrigerant is circulated through all the use side heat exchangers other than the use side heat exchanger in which the nontoxic medium is selected, as the total refrigerant amount in the third step.