Mayekawa Mfg. Co., Ltd.

The Doshisha

Choiku Yoshikawa

Makoto Sano

Daiki Kayashima

Katsumi Fujima

Toshio Kutsuna

Nelson Mugabi

Makoto Yamamoto

Hiroshi Yamaguchi

Hiroshi Sato

Yukio Hirano

Junji Matsuda

Kazutoshi Ito

Yasuhiro Hirao

Takeshi Kamimura

Kuniaki Kawamura

Iwao Terashima

Shuji Fukano

Youichi Kawazu

Mugabi Nelson

Takahiro Furudate

Takanori Kudo

Syuji Fukano

Seiichiro Matsuda

Hisataka Asami

Nobuo Oosuga

A defrost system includes a thermosiphon defrost circuit that is provided by being branched from a circulation line, in which, at the time of defrosting, a COrefrigerant staying inside a fin-tube heat exchanger repeats a two-phase change of a gaseous form and reliquefaction, and which forms a COcirculation path together with the fin-tube heat exchanger; electromagnetic opening/closing valves that are closed at the time of defrosting and set the COcirculation path to a closed circuit; and a first electric heater arranged above the thermosiphon defrost circuit so as to be adjacent to the thermosiphon defrost circuit, and naturally circulates the COrefrigerant in the closed circuit at the time of defrosting.

Defrost system which utilizes electric heater for thermosiphon

A defrost system is disclosed that includes a cooling device disposed in a freezer, a heat exchanger pipe leading into a casing, a drain receiver unit; a refrigerating device for cooling and liquefying COrefrigerant; a refrigerant circuit for permitting the COrefrigerant to circulate to the heat exchanger pipe; a defrost circuit branched from the heat exchanger pipe forming a COcirculation path with the heat exchanger pipe; an on-off valve so that the COcirculation path becomes a closed circuit; a pressure adjusting unit for adjusting the pressure of the COrefrigerant; and a first heat exchanger unit for heating the COrefrigerant circulating with brine, disposed below the cooling device to which the defrost circuit and a first brine circuit in which brine, a first heating medium, circulates, are led, in which the COrefrigerant naturally circulates in the closed circuit when defrosting by a thermosiphon effect.

Defrost system for refrigeration apparatus, and cooling unit

A sublimation defrost system for a refrigeration apparatus including: a cooling device in a freezer, and includes a casing containing a heat exchanger pipe; a refrigerating device for cooling and liquefying a COrefrigerant; and a refrigerant circuit connected to the heat exchanger pipe permitting the cooled and liquefied COrefrigerant to circulate. The defrost system includes: a dehumidifier device; a COcirculation path in the heat exchanger pipe, an on-off valve in the heat exchanger; a circulating unit for the COrefrigerant; a first heat exchanger part exchanging heat between a brine as a first heating medium and the circulating COrefrigerant; and a pressure adjusting unit for the circulating COrefrigerant during defrosting so that a condensing temperature of the COrefrigerant becomes equal to or lower than a freezing point of a water vapor in the freezer inner air without a drain receiving unit.

Sublimation defrost system and sublimation defrost method for refrigeration apparatus

A defrost system includes: a cooling device in a freezer, and includes a casing, a heat exchanger pipe with a difference in elevation in the casing, and a drain receiver unit below the heat exchanger pipe; a refrigerating device to cool and liquefy COrefrigerant; and a refrigerant circuit for permitting the cooled and liquefied COrefrigerant to circulate to the heat exchanger pipe. The defrost system includes a bypass pipe of the heat exchanger pipe to form a COcirculation path; an on-off valve in the heat exchanger pipe to be closed during defrosting so that the COcirculation path is a closed circuit; a pressure adjusting unit for adjusting pressure of the COrefrigerant during defrosting; and a brine circuit as a first heating medium, in which the defrost system permits the COrefrigerant to naturally circulate in the closed circuit during defrosting by a thermosiphon effect.

A COcooling and heating apparatus and method permit simultaneous production of high-temperature heat source and low-temperature heat source having a temperature difference therebetween. The apparatus/method uses CO(carbon dioxide) as a refrigerant, and has a first refrigerating cycle circuit where the refrigerant is compressed to a supercritical zone and then decompressed via an expansion device to a pressure/temperature level of the COtriple point or below to thereby attain evaporation. The apparatus can include multistage compressors, intermediate cooler disposed in a first refrigerant flow path between a condenser and the expansion device. A second refrigerating cycle circuit having a second refrigerant flow path, which can branch off from the first refrigerant flow path or provided in an independent closed circuit, can be provided to carry out absorption of evaporation latent heat with the first refrigerant flow path to thereby maintain the pressure/temperature level of the COtriple point (Ptr) or above. A third refrigerating cycle circuit having a third refrigerant flow path also can be provided to carry out heat exchange with the second refrigerant flow path.

[object Object]

The object of the invention is to provide a thermal complementary (combination of heat supply and heat discharge) system which can complement heat without the restriction of area of a region to be supplied with heat. An endless multiplex helical loop is formed to complement the heat produced in a region such as plants and regional facilities on a reciprocal basis, and the water is not circulated forcibly but achieves heat transfer in the helical loop. Liquid or slurry-like water is sealed in the annular endless channel (endless loop) without forcibly circulated. Therefore, loop diameter of the annular endless channel, that means the area of the region, is not limited. The water forms temperature zones in the endless helical loop, the temperature being different per each component loop. Distributed cryogenic sources and thermal sources are thermally connected to said multiplex helical loop so that heat (i.e. water) can be taken in or discharged to or from said cryogenic or thermal sources. As the water needs not be forcibly circulated, the power for forcibly circulating the water is eliminated resulting in reduced running cost. Refrigerating apparatuses, heat source apparatuses, etc. distributed in the region are effectively utilized and also central control of energy supply through the multiplex helical loops is made possible.

Inter-region thermal complementary system by distributed cryogenic and thermal devices

A low temperature waste crushing system including a low temperature freezing section for cooling waste material below the cold shortness transition temperature by receiving a supply of refrigeration from a heat sink, and a crushing section for crushing the material cooled in the low temperature freezing section by taking advantage of cold shortness. The low temperature freezing section is configured in dual steps, the preceding step being supplied with the higher temperature refrigeration of the first refrigerating cycle and the succeeding step being supplied with the lower temperature refrigeration of the second refrigerating cycle. The heat sink is configured in a binary refrigeration cycle including a first cycle of ammonia refrigerant for obtaining the first refrigeration temperature, which is higher that the cold shortness transition temperature; and a second cycle of hydrocarbon refrigerant for obtaining a second refrigeration temperature, which is lower in temperature that the cold shortness transition temperature. The device is able to reduce the burden to the environment in comparison with prior art cooling systems.

Low temperature waste crushing system taking advantage of cold shortness

A soda drink selling machine having a compact purified-water generating unit can be installed at places where purified water suiting for producing soda drinks is not available, comprises a purified-water generating unit, a carbonated water generating unit, a soda drink producing-dispensing unit, and a control system controlling each device in the soda drink selling machine so as to be operated in order or simultaneously at need, wherein the purified-water generating unit comprises a control system for controlling operations in ice maker including a heat transfer surface on heat absorbing side or releasing side of a coolant compression-evaporation type or an electronic heat pump, and in constant temperature purified-water tank, and operations of ice-crystal formation and melting processes in the ice maker.

Soda drink selling machine

Growing community of inventors

Tokyo, Japan

Choiku Yoshikawa