air conditioner

Abstract

Disclosed is an air-conditioning apparatus that includes a plurality of intermediate heat exchangers performing the same function (as a condenser or an evaporator) and allows each intermediate heat exchanger 31 to exchange heat between a refrigerant heated or cooled in a refrigeration cycle on a heat source side and a heat medium flowing through a heat medium circuit on a use side such that heat energy produced on the heat source side is transmitted to use side heat exchangers 35. A controller 202 calculates the difference between a heat medium inlet temperature Twi and a heat medium outlet temperature Two of the use side heat exchanger 35 which is operating to obtain a heat medium temperature difference ”Tw for the use side heat exchanger 35, and controls a heat medium flow control device 45 such that the heat medium temperature difference ”Tw reaches a target heat medium temperature difference ”Twm. When the heat medium inlet temperature Twi deviates from a predetermined range, the controller 202 changes the target heat medium temperature difference ”Twm and controls the heat medium flow control device 45 for at least one of the use side heat exchangers 35 in operation.

Description

technical field [0001] The present invention relates to, for example, an air conditioning device used in a multi-type air conditioner for a building. Background technique [0002] In conventional air-conditioning equipment used in multi-type air conditioners for buildings, etc., heat is exchanged in heat exchangers related to heat medium between the refrigerant heated or cooled on the heat source side and the heat medium flowing in the circuit on the utilization side , transfer the thermal energy generated on the heat source side to the heat exchanger on the utilization side (that is, the indoor unit) (for example, refer to Patent Document 1). The air-conditioning apparatus described in Patent Document 1 detects the temperature difference between the heat medium flowing out and flowing into the use-side heat exchanger (hereinafter referred to as the temperature difference between the inlet and outlet of the indoor unit). Moreover, if the temperature difference between the i...

AI Technical Summary

Problems solved by technology

Therefore, also in the air-conditioning apparatus described in Patent Document 2, there is a problem similar to that of Patent Document 1.

[0011] In addition, in the air-conditioning apparatus described in Patent Document 2, the circulation amount on the refrigerant side is controlled so that the heat medium flowing out of the heat exchanger related to heat medium becomes the first target temperature. In the case where multiple heat exchangers related to heat medium that simultaneously perform the same function as condensers or evaporators are connected, since the air-conditioning load borne by each heat exchanger related to heat medium is different, the set refrigerant side circulation amount changes. very difficult

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