Mitsubishi Denki Kabushiki Kaisha

Keiji Nonami

Masami Imanishi

Moriya Miyamoto

Takeshi Yoshida

Hideaki Tagashira

Yasufumi Hatamura

Seiji Inoue

An apparatus for controlling a refrigeration cycle for circulating a refrigerant through a compressor a heat exchanger for condensation a flow rate control valve and a heat exchanger for evaporation connected each other, comprising: a first operation means for changing a heat exchanging capability of said heat exchanger for condensation a second operation means for changing a heat exchanging capability of said heat exchanger for evaporation a means for operating a running capacity for changing a running capacity of said compressor, and a control means for reducing a difference between a running condition on a high pressure side or a low pressure side of said refrigeration cycle and a target, wherein when a difference between a running condition on a high or low pressure side and its target is reduced, the control means bring the running condition closer to the target, minimizes a consumption energy, and bring a temperature difference of a heat exchanging fluid between an inlet and an outlet of the heat exchanger for condensation closer to a target temperature difference.

Apparatus for controlling refrigeration cycle and a method of controlling the same

A heat storage type air conditioner which is free from a difficulty that, when a general cooling and heating circuit and a cold radiating and heat radiating circuit are operated separately or simultaneously, the quantities of refrigerant in those circuits become smaller or larger than required, so that its compressor is damaged or the cooling or heating capacity is lowered. When, in a heat storage type air conditioner, first and second bypass circuits 22 and 23 are closed, a general cooling and heating circuit 18 driven by a compressor 1 and a cold radiating and heat radiating circuit 21 driven by a refrigerant gas pump 13 are made independent of each other, so that a cooling operation or a heating operation is carried out with the aid of a first use-side heat exchanger 4a and a second use-side heat exchanger 4b. Therefore, in the air conditioner, the refrigerant or refrigerating machine oil will never concentrate in any one of the two circuits. In a cold storing operation or a heat storing operation for a heat storage tank 8, the two bypass circuits 22 and 23 are opened, so that the general cooling and heating circuit 18 is communicated with the cold radiating and heat radiating circuit 21. As a result, the refrigerant is led from the general cooling and heating circuit into the heat storage tank 8 to store cold or heat in the heat storing medium 7 therein.

Heat storage type air conditioner, and defrosting method

Growing community of inventors

Tokyo, Japan

Keiji Nonami