Hitachi, Ltd.

Hiromu Yasuda

Kensaku Oguni

Susumu Nakayama

Takao Senshu

Shizuo Zushi

Hirokiyo Terada

Kenji Tokusa

Tetsuji Yamashita

Tomio Yoshikawa

Kyuhei Ishibane

Shigeaki Kuroda

Kyoshiro Murakami

Toshio Hatada

Kazumoto Urata

Hideyuki Kimura

Sigeaki Kuroda

Akira Atsumi

Masatoshi Muramatsu

Rumi Minakata

Takahiro Daikoku

Kazutaka Suefuji

Kenji Takahashi

Masakatsu Hayashi

Tetsuya Arata

Kenichi Nakamura

Masaaki Itoh

Hiroshi Kogure

Takashi Kato

Yozo Hibino

Minetoshi Izushi

Taketoshi Mochizuki

Tatsuya Sugiyama

Takashi Sano

Minoru Sato

Naoki Shikazono

Sumiyoshi Takeda

Hironori Etou

Tomomi Umeda

Yasutaka Yoshida

Fumihiko Kitani

To obtain an electricity storage type air conditioning apparatus which is capable of coping with the improvement in performance of the air conditioner or the needs for increase in cooling load and additional equipment to be installed afterward, by which it becomes possible to easily reduce the power consumption in the daytime even for an existing apparatus in which peak power cut is not considered, and which is suitable to reduce the noise and decrease the size. An electricity storage type air conditioning apparatus comprises a refrigeration cycle system including a compressor, a thermal-source-side heat exchanger, a decompression device and a service-side heat exchanger which are annularly connected by means of pipes to allow a refrigerant to circulate therethrough, a storage battery in which electric power is stored, and a cooling/heating source device by which the refrigerant is cooled and heated between the thermal-source-side heat exchanger and the service-side heat exchanger, the cooling/heating source device being driven with the storage battery.

Electricity storage type air conditioning apparatus and cooling/heating

A heat exchanger composed by overlapping a plurality of heat exchanger units each of which is formed by inserting a plurality of fins over one or a plurality of heat transfer tubes. The fins are worked so that a pair of opposed fins of the overlapped heat exchanger units are brought into contact with each other at one or more points. This heat exchanger constitutes an air conditioner when the heat exchanger units are overlapped in a direction of gravity.

Heat exchanger and air conditioner using same

A cooling apparatus has a heat exchanger for performing heat exchange between cooling water and fluid, and a flow rate regulator valve for regulating a flow rate of either the cooling water or the fluid which pass through the heat exchanger. A cooling temperature of the fluid is preset. A temperature of the cooled fluid is detected, and an opening degree of the flow rate regulator valve is changed when there is a difference between the detected temperature and the preset temperature. Simultaneously, either a temperature difference of the cooling water and the fluid or a flow rate of the cooling water is detected. The opening degree of the flow rate regulator valve is corrected or compensated on the basis of a result of the detection, thus enabling suitable temperature control of the fluid in accordance with a variation of the temperature or flow rate of the cooling water.

Cooling apparatus and temperature control method therefor

A heat-pump device indicates a weight of inappropriate amount of refrigerant in a heat-pump cycle by comparing an actual amount of refrigerant in the heat-pump cycle with an appropriate amount thereof, operates in accordance with a refrigerant amount judging operational mode when the actual amount of refrigerant is measured, and includes a judging device for judging the amount of refrigerant in the heat-pump cycle on the basis of a temperature of refrigerant at a condensor side and at least one information showing an operational condition of the heat-pump cycle.

Refrigerator and method for indicating refrigerant amount

The control system for the air-conditioner disclosed herein comprises means for setting a set value of a room temperature, means for detecting an actual value of the room temperature, means for detecting a radiant heat from walls etc. of the room as a radiation temperature, and an operational control means. The operational control means stores a comfort line which defines an inverse proportional relation between the room temperature and the radiation temperature, said comfort line depending upon set value of the room temperature. The operational control means calculates a first control index which is represented by a difference between the actual value and the set value of the room temperature and a second control index which is represented by a difference between the comfort line and the current temperature condition represented by the actual room temperature and the radiation temperature. The room temperature set value is modified in the operatal control means, according to fuzzy rule, on the basis of said first and second control indexes. The operational control means controls the air-conditioner, depending upon a difference between the modified value of the room temperature and the actual value of the room temperature, thereby providing a comfortable air-conditioned environment to a person staying in the room.

Control system for air-conductioner

A water chilling apparatus comprising a plurality of chilling modules each having a refrigerating cycle mainly composed of a compressor, a condensor, an evaporator and an expansion mechanism, and a control module having a water pump for feeding, to an object to be chilled, chilling water cooled down by the evaporator of each chilling module, a detector for detecting a temperature of the chilling water and a water temperature controller. A chilling ability of each chilling module in response to a variable frequency is kept at substantially the same level. A capacity of the compressor of each chilling module is variably controlled in a range between an upper limit capacity and a lower limit capacity. The water temperature controller is used to calculate a whole necessary capacity value needed in the compressors of all the chilling modules as a function as a deviation between a set value of the chilling water temperature and a chilling water temperature detected by the detector. The number of the operated chilling modules is controlled in response to the whole necessary capacity value and the upper and lower capacities of each of the chilling modules. The capacity of the compressor of each of the cooling modules is controlled so as to have a capacity value obtained by equally distributing the calculated whole necessary capacity value by the number of the operated chilling modules.

Water chilling method and apparatus for the same

An air-conditioner system having a compressor, a plurality of heat exchangers for heating or cooling the air in a room, a radiator for transferring heat energy of refrigerant outside of the room, a plurality of orifices, a manifold with a main port and a plurality of sub-ports, flow direction control multi-port valves directing the flow of the refrigerant from the compressor to the main port and not from the main port to the compressor when at least one of the heat-exchangers is heating the room. The refrigerant does not flow from the compressor to the radiator when at least one of the heat exchangers is heating and none of the heat exchangers is cooling. Also, it does not flow from the compressor to the main port but flows instead from the compressor to the radiator and from the main port to the compressor when none of the heat exchangers is heating and at least one of the heat exchangers is cooling. The system also employs a plurality of valve pairs each of which having a first valve and second valve such that the first valve opens (closes) when the second valve closes (opens). The first valves are arranged for providing flow of refrigerant to the inlet of the compressor from the heat exchangers and the second valves provide flow of refrigerant from the outlet port of the compressor to the respective heat exchanger first ports via the sub-ports of the manifold.

Air-conditioner system

A heating portion is cooled by a fluid, thereby effecting a temperature control. The temperature of the fluid is measured at the time of starting of a system, and the measured fluid temperature is compared with a set temperature. In accordance with the result of the comparison, the timing of starting the operation of LSI chips and the timing of starting the operation of a refrigerator are controlled.

Fluid temperature control system and computer system using same

An air conditioner includes a compressor, a four-way valve, an indoor heat exchanger, an expansion valve, an outdoor heat exchanger which are connected via pipings to form a heat pump type refrigerant circuit, the four-way valve being switched over to select a heating or cooling mode of operation. This air conditioner is further provided with a first and second branch pipes which extend from an outlet conduit of the compressor, the first branch pipe forming a first bypass pipe connected to an inlet conduit of the compressor. The first and second branch pipes have first and second valves, respectively. The air conditioner is also provided with a microcomputer for selectively opening and closing the second valve in response to the degree of superheating of discharged gaseous refrigerant after the first valve has been opened so that the discharged gaseous refrigerant is supplied to the outdoor heat exchanger to effect a defrosting operation while a heating operation is continued. When the degree of superheating of discharged gaseous refrigerant is low, a part of discharged gas is supplied to the inlet conduit so as to regulate the degree of superheating.

Defrosting of refrigerator system out-door heat exchanger

A refrigerant flow control system associated with a refrigerant circulating circuit having a compressor, a condenser, an expansion valve and an evaporator, includes a branch pipe extending from a discharge pipe of the compressor and having on sealed free end. A first temperature sensor is disposed on the branch pipe near the sealed free end for detecting a condensation temperature of a refrigerant which is condensed in the branch pipe. A second temperature sensor is disposed on the discharge pipe of the compressor for detecting a temperature of the gaseous refrigerant discharged from the compressor. The signals representative of the condensation temperature and the temperature of the discharge gaseous refrigerant are inputted to a control device. The control device calculates a difference between the two detected temperatures, and a degree of superheat of the discharged gaseous refrigerant and transfers to the expansion valve a command signal representative of the calculation results, thereby controlling an opening of the expansion valve.

Refrigerant flow control system for use with refrigerator

The present invention is characterized by selecting, during heating, the hot air blowing mode in which a compressor and a blower for an indoor heat exchanger are each controlled as to r.p.m. to control the temperature of outlet air blown from an air conditioner at a higher temperature, and the normal mode in which the room temperature is controlled. Also, as required, an air passage of the outlet is set to be narrow to blow hot air in a confined space, or the air passage of the outlet is set wide to disperse warm air during normal operation.

Control method and apparatus for an air conditioner using a heat pump

An expansion valve has a refrigerant inlet passage, a refrigerant outlet passage, a valve chest to which both the passages open, a diaphragm chamber communicating with a heat-sensitive bulb through a tube of small diameter, and a valve body actuated in response to the operation of a diaphragm, the valve body being disposed facing a valve seat in the valve chest to regulate a passage defined between the valve seat and the valve body, to thereby control the flow rate of a refrigerant. The valve seat is adapted to be axially movable along the inner wall of the valve chest. In addition, means are provided for moving the valve seat in accordance with a change in pressure in the refrigerant circuit.

Expansion valve

A heat pump type refrigeration system for air conditioners. The system has a heat pump type refrigeration circuit including a compressor the suction side and discharge side of which are switchably connected to an indoor heat exchanger and an outdoor heat exchanger through a four-way valve. The other sides of the heat exchangers are connected to each other through a first pressure reducer, gas-liquid separator and a second pressure reducer. A refrigerant tank is disposed in a pipe interconnecting the four-way valve and the indoor heat exchanger, in a heat exchanging relation to the pipe. The gas-liquid separator is connected at its upper portion to the refrigerant tank. The heat pump type refrigerant circuit confines a bi-component refrigerant consisting of two refrigerants of different boiling temperatures.

Heat pump type refrigeration system

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Shizuoka, Japan

Hiromu Yasuda