Sanyo Electric Co., Ltd.

Thermal Analysis Partners, Llc.

Ichiro Kamimura

Hiroshi Mukaiyama

Masahisa Otake

Norio Sawada

Satoshi Imai

Koji Sato

Osamu Kuwabara

Toshikazu Ishihara

Hiroyuki Itsuki

Kazuhiro Shimura

Yunho Hwang

Reinhard Radermacher

Kazuaki Mizukami

Akira Sugawara

Tetsuya Masuda

Masahiro Kobayashi

Kunie Sekigami

Hirokazu Izaki

Kouji Nagae

Naohito Sakamoto

Etsushi Nagae

Takao Shiina

Yukiharu Inoue

Takeshi Ookubo

Hans Huff

Kouji Satou

Tetuya Masuda

A multi-stage refrigeration system is provided. The refrigeration system includes a first compression element which produces a first compressed refrigerant stream. A mixer combines the first compressed refrigerant stream with an auxiliary refrigerant stream. A second compression element is coupled to the mixer and produces a second compressed refrigerant stream. A first heat exchanger receives the second compressed refrigerant stream and generates a cooled stream. A stream splitter receives the cooled stream and provides first and second output streams. A first expansion valve receives the first output stream and controls the flow of the first output stream and a second expansion valve receives the second output stream and controls the flow of the second output stream. A second heat exchanger generates the auxiliary refrigerant stream provided to the mixer. An evaporator is coupled to the first expansion valve and the first compression element to evaporate the first output stream and provide an evaporated stream to the first compression element.

Multi-stage refrigeration system including sub-cycle control characteristics

An object is to provide an air conditioner in which a desiccant air conditioner is combined with a refrigerating device to cool an indoor by a refrigeration cycle including a compressor and the like and in which a drop of energy efficiency is suppressed. An air conditionerincludes a desiccant air conditionerand a refrigerating devicewhich cools the indoor by a usual refrigeration cycle, this refrigerating devicehas an auxiliary heat exchangerbetween an outlet side of a heaterand an inlet side of an expansion valve, and this auxiliary heat exchangeris disposed externally from an exhaust air passageand a supply air passage

Air conditioner

In a refrigerant cycle apparatus which is operated at a supercritical pressure on a high-pressure side, for a purpose of maintaining or enhancing performances or reducing generation of clogging or a dimension of a capillary tube, a compressor has a first compression element, and a second compression element which compresses a refrigerant compressed by the first compression element, a gas phase refrigerant in an intermediate pressure receiver is sucked into the second compression element of the compressor, a liquid phase refrigerant in the intermediate pressure receiver is pressure reduced in a second pressure reducing device, and introduced into an evaporator, and the first pressure reducing device comprises a capillary tube on an upstream side of the refrigerant, and throttling means on a downstream side of the capillary tube.

Refrigerant cycle apparatus

A refrigerating machine comprising a compressor, a radiator, a pressure-reducing device, a gas-liquid separator, plural heat absorbers functioning selectively in different temperature zones, a unit for allowing introduction of gas refrigerant separated in the gas-liquid separator into an intermediate pressure portion of the compressor, and a low pressure side circuit in which liquid refrigerant separated in the gas-liquid separator is circulated, wherein the low pressure side circuit is provided with at least a heat absorber functioning in a low temperature zone.

Refrigerating machine

In a refrigerating machine, a water cooling device having a cooling tower or an ice heat storage tank is provided as a heat exchanger for cooling refrigerant after heat-exchange in a heat-source side heat exchanger between an outdoor expansion valve and the heat-source side heat exchanger.

Heat exchange apparatus and refrigerating machine

In a heat pump type hot water supply apparatus having a compressor (), an outdoor heat exchanger (), an expansion valve () and at least one indoor heat exchangers, and a water heat exchanger () for heat-exchanging refrigerant and water to achieve hot water, the water heat exchanger () is equipped in the refrigerant circuit so as to be connected to the outdoor heat exchanger () in series in the refrigerant circuit.

Refrigerant circuit and heat pump type hot water supply apparatus

A heat pump apparatus that having a refrigerating cycle including a compressor, a gas cooler, a pressure reducing device and an evaporator and is designed so that water can be heated by the gas cooler. A refrigerant such as COor the like working in a supercritical area is filled and used at a high-pressure side in the refrigerating cycle and a radiator is equipped between the exit of the gas cooler and the pressure reducing device. The refrigerant temperature at the exit of the radiator is kept at a substantially fixed temperature irrespective of the temperature of hot water to the gas cooler.

Heat pump

An automatic vending machine is provided in which the exhausted heat produced by cooling is utilized effectively and decrease in running costs is accomplished. The automatic vending machine includes primary heat unit having compressor and primary heat exchanger and secondary heat unit B having secondary heat exchanger B. The primary heat exchanger is connected with refrigerant-ejecting pipe and refrigerant return pipe attached to the compressor through valves A and B, respectively, so that changing over is allowed. High-pressure gas pipe connected with the refrigerant-ejecting pipe, low-pressure gas pipe connected with the refrigerant return pipe and liquid pipe connected with the primary heat exchanger are provided. These secondary heat exchangers are connected to the high-pressure gas pipe and the low-pressure gas pipe through valves A and B selectively operated. The secondary heat units are provided in compartments of the automatic vending machine.

Automatic vending machine

In a method and an apparatus for injecting mixed refrigerant into a refrigerant circuit comprising at least a compressor, a condenser, an expansion device and an evaporator which are connected to one another through a refrigerant pipe, the mixed refrigerant is intermittently injected from a refrigerant bomb at a predetermined position of a low pressure side of the refrigerant circuit while keeping the mixed refrigerant in a liquid state. The intermittent injection operation (amount) of the liquid refrigerant into the refrigerant circuit may be controlled on the basis of the degree of superheat of the mixed refrigerant in the refrigerant circuit.

Mixed refrigerant injection method

An air conditioner has an outdoor unit and a plurality of room units supplied with a refrigerant from the outdoor unit. The outdoor unit and the room units are connected by a plurality of refrigerant pipes. In a recovery operation for returning refrigerator oil from the room units, the refrigerant pipes and the like to the outdoor unit, the plurality of room units are divided into a plurality of room unit groups, and the recovery operation of the refrigerant is carried out for each of the room unit groups.

Method of returning refrigerator oil of air conditioner

An air conditioner using a non-azeotropic mixture refrigerant formed of a high boiling-point refrigerant and a low boiling-point refrigerant is provided with a first temperature sensor for detecting a temperature at an inlet of an outdoor heat exchanger when the outdoor heat exchanger serves as an evaporator in heating cycle, a second temperature sensor for detecting an outside air temperature, and a controller for controlling an opening degree of an expansion valve on the basis of a temperature difference between the outside air temperature and the inlet temperature of said evaporator. For example, the opening degree of the expansion valve is controlled so that the temperature difference between the outside air temperature and the inlet temperature is equal to a predetermined value.

Air conditioner having frost preventing member

In a multiroom air-conditioning apparatus, refrigerant flow between plural outdoor side units is controlled so that abnormality (lack or excess) of refrigerant amount in an outdoor side unit in operation is redressed. For example, when surplus refrigerant exists in an outdoor side unit, the refrigerant flow is so controlled that the surplus refrigerant is pushed out (flow out) into an outdoor side unit in non-operation. In addition, the output of the air-conditioning apparatus is smoothly variable (controllable) in accordance with an air-conditioning load over the whole air-conditioning load range from the minimum (zero) load to the maximum load.

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Gunma, Japan

Ichiro Kamimura