Sanyo Electric Co., Ltd.

Sanyo Electronic Co., Ltd.

Hidetoshi Arima

Masahiro Furukawa

Eiichi Enomoto

Mamoru Kubo

Atsushi Ogawa

Nobuhiro Idei

Masashi Izumi

Makoto Nakamura

Kazuhiro Yoshii

Kazuhiro Shimura

Akira Hatakeyama

Masahiro Maekawa

Kazuhiro Hitomi

Toshihiro Yamada

Naohito Sakamoto

Hiroyuki Takada

Hitoshi Kanuma

Atsushi Shitara

Yoshio Ozawa

Kazuaki Mizukami

Norikazu Kubota

Masayuki Oonou

Kazuyasu Iramina

Masashi Yasuda

Toshiyuki Kaneko

Toshio Kubo

Hisao Honda

Tomoyuki Murayama

Takeshi Okumura

Masatoshi Asakawa

Tomohiro Morita

Yasumichi Kouri

In a high-temperature regenerator which has vertical liquid pipe groups in the proximity of which a combustion flame and combustion gas from a burner pass and a double can wall which communicates with upper and lower portions of liquid pipes forming the vertical liquid pipe groups and is arranged at a position of a furnace wall and which heats and concentrates a diluted absorption solution passing through the vertical liquid pipe groups and the double can wall, a solution inlet for sprinkling the diluted absorption solution in an open state is provided above liquid pipes arranged on a side opposite to the burner. Since the sprinkled diluted absorption solution collects the heat of an exhaust gas while it falls to increase its temperature, when it flows into the other liquid pipes, it boils immediately and its circulation flow is activated by boiling. Therefore, total heat transfer coefficient can be increased, a local rise in the temperature of the liquid pipe groups and the can wall can be avoided, and such inconvenience as a corrosion accident and the crystallization of a solution caused by this rise in temperature can be prevented.

High-temperature regenerator

In an air conditioning system for circulating a fluid which can change a phase between a gas phase and a liquid phase by a difference of a specific gravity between the gas phase and the liquid phase between an heat source side machine and a plurality of user side machines more than half of which are disposed below the heat source side machine, so that each of the user side machines performs a cooling operation, each of the user side machines is provided with a heat exchanger, a flow control valve for controlling a volume of said fluid supplied to the heat exchanger, a blow means for supplying an air-conditioned air to a room through the heat exchanger, a physical value detecting means for detecting a physical value relating to an air conditioning load such as a temperature and a signal controlling means for the operating and detecting portions, and wherein the heat source side machine is provided with a control means for communicating with said signal controlling means and outputting a control signal to said flow control valve of the user side machine. Accordingly, even in the case that the cooling load is the same, the opening ratio of the flow control valve of the user side machine mounted on the higher floor can be controlled so as to be greater than that of the user side machine mounted on the lower floor. In accordance with the above structure, the air conditioning characteristic in the air conditioning system which is basically controlled by a natural circulation and in which it is hard to supply the fluid to the user side machine mounted on the higher floor, so that it is hard to operate the air conditioning can be improved.

Air conditioning system

An air conditioning system comprises a heat source side unit adapted to condense and supply a fluid which can change a phase between a gas phase and a liquid phase and a plurality of user side units entirely or mostly disposed below the heat source side unit in terms of number and connected to said heat source side unit by piping so as to establish a circulation of the fluid supplied from said heat source side unit passing through said heat source side unit and said user side units by utilizing the difference in specific gravity between the liquid phase and the gas phase of said liquid so that it can provide a cooling/heating effect regardless of the floors where the user side units are installed and the power consumption rate of the system can be minimized. More specifically, the heat source side unit 1 and the user side units 4 arranged below the heat source side unit 1 are connected by way of liquid phase piping 6 and gas phase piping 7 to form a closed circuit 3 and a motor pump 10 is arranged along the liquid phase piping 6. Refrigerant R-134a is condensed in the heat source side unit 1 and sent to the user side units 4 by the motor pump 10 in the cooling mode of operation, whereas it is condensed in the user side units 4 and sent to the heat source side unit 1 by the motor pump 10 in the heating mode of operation. The number of revolutions per unit time of the motor pump is controlled modifying the number of poles of the pump or the frequency of the AC fed to the pump.

An air conditioning system comprises a heat source side machine such as an absorption type refrigerator, a plurality of user side machines more than half of which are disposed below the heat source side machine, and liquid phase and gas phase pipes connecting the heat source side machine with the user side machines to form a closed circuit. A phase-changeable fluid circulates between the heat source side machine and the user side machines by utilizing its own specific gravity difference between the liquid and gas phases and a driving force of an electric pump provided to the liquid phase pipe, so that each of the user side machines can perform cooling operation. A receiver tank is provided to the inlet side of the electric pump, and an upper portion of the receiver tank is connected to the gas phase pipe by a pressure-equalizing pipe so as to improve a start characteristic of the cooling operation. Moreover, the fluid transported from the electric pump is recooled in the heat source side machine so that the fluid heated by the electric pump does not generate bubbles in the liquid phase pipe when being transported to the user side machine that performs cooling operation.

In an air conditioning system comprising a heat source side machine for condensing a fluid which can change a phase between a liquid phase and a gas phase to a predetermined temperature and for supplying, and a plurality of user side machines more than half of which are disposed below said heat source side machine, in which piping is constructed in such a manner as to circulate the fluid supplied from said heat source side machine by using a difference in specific gravity between the liquid phase and the gas phase, between said heat source side machine and said user side machine and a cooling of said user side machine is performed by evaporating said fluid in said user side machine, the heat source side machine is provided with a control means for descending a set temperature of said fluid discharged from said heat source side machine after condensed by changing the operating capacity of said heat source side machine when a state that the temperature of said fluid returned back after evaporated in the user side machine at a time of a cooling is higher than a predetermined temperature continues for a predetermined time period. Accordingly, even when the cooling effect is insufficient due to the super-heated state of the fluid in the user side machine, the super-heated state of the fluid is resolved after the predetermined time has passed, thereby returning to the normal cooling

In a compact absorption type refrigerator which eliminates an ill effect caused by the local overheating of a heating chamber in a high-temperature regenerator with a liquid pipe boiler, a high-temperature regenerator 5 heats a heating chamber 63 in which vertical liquid pipes 51 for circulating a diluted absorption solution 2a are arranged in a matrix form with the combustion surface 60D2 of a plane flame type burner 60X to evaporate refrigerant vapor 7a from the diluted solution 2a. The width 60BX of the combustion surface 60D2 within a horizontal plane is made smaller than the width 51BX of the liquid pipes 51 arranged in a matrix form, the volume of flames on the combustion surface 60D2 within the horizontal plane is made large at a central portion and small at portions on wall 50B sides, or the volume of flames on the combustion surface 60D2 within a vertical plane is made large at an upper portion and small at a lower portion so that the diluted solution 2a flows in an upward direction in flow passages 51a and a downward direction in flow passages 50a and 50b.

Absorption type refrigerator

A control system for absorption chillers which comprises a device for measuring operating state data concerning components of the main assembly of the chiller and including the liquid level of a high temperature generator and the degree of opening of a gas valve, and a fuzzy control circuit for calculating the deviation of the liquid level from a target value based on the measured operating state data, predicting a variation in the liquid level from the deviation and another item of the operating state data and calculating a control input as to the inverter frequency of an absorbent pump based on the result of prediction, whereby even when a great disturbance occurs, the liquid level of the generator can be controlled with high responsiveness to minimize the variation of the liquid level.

Control system for absorption chillers

A control device for an absorption refrigeration machine in which an evaporator, an absorber, an absorption liquid pump, a generator and a condenser, etc. are connected to form a refrigeration cycle. A heating amount of the generator is controlled on the basis of external conditions or internal conditions. The device includes a detection device for detecting a plurality of change amounts representative of the external conditions or internal conditions. A memory device stores fuzzy rules and membership functions between the change amounts and a rotational speed of the absorption liquid pump. An arithmetic unit carries out fuzzy logical calculations based on the change amounts and the fuzzy rules and membership functions to calculate the rotational speed of the absorption liquid pump. A control device inputs an output of the arithmetic unit to control the rotational speed of the absorption liquid pump.

Control device for an absorption refrigeration machine

A control device for an absorption refrigerator which forms a refrigeration cycle by connecting an evaporator, an absorption unit, a generator, a condenser and the like to control a heating amount of the generator. Singular or plural amounts of change representative of externasl conditions are detected. A heating amount of the generator is controlled by a fuzzy logic calculation.

Control device for absorption refrigerator

A control system for an absorption refrigerator comprising an evaporator, absorber, generator and condenser for providing a refrigeration cycle. At least one fuzzy rule includes two antecedent input variables and two membership functions for the two input variables. When consequent membership functions of the rules are arranged in a matrix in corresponding relation to the two antecedent membership functions, the consequent membership functions are defined in every other row and every other column of the matrix in a region where at least the two input variables take a positive or negative great value.

Control system for absorption refrigerator

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Gunma-ken, Japan

Hidetoshi Arima