Mitsubishi Denki Kabushiki Kaisha

Hiroaki Hama

Masami Imanishi

Hitoshi Iijima

Osamu Morimoto

Naoki Tanaka

Hidekazu Tani

Hiroshi Nakata

Moriya Miyamoto

Hideaki Tagashira

Takeshi Yoshida

Yasuyuki Funahashi

Seiichi Kato

Toshiro Abe

Takashi Shiga

A heat storage type air conditioning system capable of performing refrigerant receiving and discharging control and oil quantity control, which, in operating the general cooling circuit and the cold radiating circuit simultaneously or separately, is free from difficulties that the compressor is damaged or the cooling capacity is lowered when the quantities of refrigerant in those circuits are excessively increased or decreased, and is able to continue the operations with the quantity of refrigerant and the quantity of ice machine oil adjusted to suitable values. In the heat storage type air conditioning system, evaporators are provided in a general cooling circuit driven by a compressor and in a cold radiating circuit driven by a refrigerant gas pump, respectively, so that those circuits operate independently of each other. Furthermore, bypass circuits are provided to allow refrigerant to flow between liquid pipes and between gas pipes in those circuits. In a cold storing operation, the bypass circuits are closed, so that a cold storing circuit is formed by the compressor, a condenser, a first pressure reducing mechanism, and a cold storing heat exchanger.

Heat storage type air conditioning apparatus

A refrigeration cycle apparatus comprises first and second compressors, a four-way valve, an outdoor heat exchanger, first and second expansion means, at least one indoor heat exchanger, an accumulator, a refrigerant circuit connecting these element in order, a reservoir connected to the accumulator through an overflow pipe and a refrigerant supplying pipe with a first solenoid valve and a feeding pipe with a second solenoid valve for connecting the inlet side of the expansion means to the reservoir, wherein the first and second solenoid valves are opened and closed depending on operational conditions in a refrigeration cycle.

Refrigeration cycle apparatus

The refrigerating cycle apparatus of the invention is provided with a pair of condenser and evaporator, two compressors, and a riser piping for rising therethrough a refrigerant and provided at a suction pipe for one compressor, the suction pipe for the other compressor being connected with the riser piping, so that even when the flood back condition occurs during the individual operation of the one compressor, both compressors are adapted to maintain a proper oil quantity therein.

Refrigerating cycle apparatus

A heat pump employing a capillary tube as an expansion device is disclosed. The main throttle portion of the heat pump comprises a main capillary tube and a by-pass through which a portion of the refrigerant flows and cools the refrigerant flowing through the main capillary tube. A solenoid valve for controlling the flow of refrigerant through the main capillary tube is connected to the intake of the main capillary tube, and an electrical expansion valve is connected to the intake of the by-pass for controlling the flow therethrough. An auxiliary capillary tube for cooling and an auxiliary capillary tube for heating are connected in parallel with the main throttle portion, both capillary tubes having a higher resistance to flow than the main capillary tube. The auxiliary capillary tubes increase the range over which control of the flow of refrigerant can be achieved, allowing both a smaller flow of refrigerant during under minimum cooling or heating load as well as a larger flow of refrigerant under maximum cooling or heating load.

Heat pump with capillary tube-type expansion device

An air-conditioning and hot water supply system, which comprises a heat pump type refrigerating device at the primary side having a user side heat-exchanger and a heat source side heat-exchanger with a coolant of excellent low temperature characteristic being filled in both of them; a refrigerating device at the secondary side having a user side condenser for heating water for hot water supply and a heat source side evaporator with a coolant of excellent high temperature characteristic being filled in both of them; fan coil units for air-conditioning communicatively connected with the user side heat-exchanger of the heat pump type refrigerating device at the primary side and the heat source side evaporator of the refrigerating device at the secondary side; and a circuit for air-conditioning, through which cold or warm water is caused to circulate between the user side heat exchanger and the heat source side evaporator, the cold water or warm water after the air-conditioning operation by the fan coil units being circulated in the heat source side evaporator of the refrigerating device at the secondary side and the user side heat exchanger of the heat pump type refrigerating device at the primary side.

System for air-conditioning and hot water supplying

Described is a cooling/heating and hot water service system making use of a single heat source apparatus. The system includes a heat pump chiller designed to perform cyclic operations of heating and cooling, a heat exchanger unit having a heat exchanger adapted for supplying hot water and a water reservoir. The operating time zone for storage of hot water and the operating time zone for heating and cooling the room are set by a first program timer while the operating time zone for servicing hot water is set by a second program timer. In this manner, the cooperating time zone of the system is divided into the operating time zone for storage of hot water and the operating time zone for heating and cooling, and the operation of storage of hot water is effected during the time of the day that heating or cooling of the room is unnecessary while servicing of hot water is effected during the time of operation of heating or cooling the room, with resultant improvement in the operating rate of the unit and more efficient heating/cooling and servicing of hot water.

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Wakayama, Japan

Hiroaki Hama