AIR CONDITIONING APPARATUS

摘要

In a first cycle 5, a first heat exchanger 11, in which a first medium exchanges heat with the outside air, and a second heat exchanger 15 and a third heat exchanger 17, in which heat is exchanged between the first cycle 5 and a second cycle 6 and between the first cycle 5 and a third cycle 7, respectively, are connected in series with a first reducing valve 14 and a second reducing valve 16 interposed thereamong. Thus, a circuit capable of flexibly performing cooling, heating, simultaneous cooling and heating, cooling at two temperatures, and heating at two temperatures is realized. In the second cycle 6 and the third cycle 7 that convey cooling energy and heating energy, the flow rates of a second medium in respective branches are adjusted by flow-rate-adjusting valves 32 in accordance with the entrance and exit temperatures of indoor units, and the total flow rate is determined by controlling the rotation speed of a pump by a minimum resistance method. According to an advance responsiveness-checking evaluation, a quick response is obtained. Therefore, even if there are a plurality of loads and the loads change significantly, a stable controlling operation is realized, enabling a highly efficient operation.