Hitachi, Ltd.

Hitachi Plant Engineering Construction Co., Ltd.

Hitachi Koki Co., Ltd.

Michio Yanadori

Seigo Miyamoto

Keiichi Koike

Motokazu Uchida

Yasushige Kashiwabara

Toshitsugu Hara

Toshihiko Fukushima

Yoshifumi Kunugi

Yoritsune Abe

Hideki Tanaka

Isao Nakajima

Kohji Kamejima

Tomihisa Ohuchi

Makoto Kurosawa

Yuji Hosoda

Hideaki Kamohara

Tsuneki Kobayashi

Kengo Hasegawa

Kensei Hosoya

Toshiaki Kawabata

Kichizaemon Okazaki

Minoru Kano

Yasuaki Nara

Kenichi Igarashi

Katsuji Ootuka

Hiroichi Oshiyama

Eisaku Kato

Masahiro Oguri

Tomohiro Kawano

A refrigerating apparatus according to the present invention is composed of the combination of a chemical type refrigerating unit and a compression type heat pump. The chemical type compression unit includes reactors each having a reaction material accommodated therein and the reactors are provided with heat exchangers of the compression type heat pump. Further, heat exchangers of the compression type heat pump are provided with the condenser of the chemical type refrigerating unit. Heat of condensation produced in the condenser is recovered by the heat exchangers of the compression type heat pump and the heat exchangers of the reactors are selectively switched so that they are heated or cooled by the compression type heat pump.

Refrigerating apparatus provided with chemical type refrigerating unit

The regeneration temperature of a chemical heat pump of closed system utilizing reversible reaction between calcium oxide and water is lowered by using an aqueous solution of a salt in an absorber-condensor provided separately from a reactor filled with calcium hydroxide.

Chemical heat pump

A heat accumulation system has a plurality of chemical heat accumulation units arranged in parallel and each incorporating reaction vessels containing, respectively, a chemical heat accumulating material such as zeolite and a reaction medium such as water. Any surplus heat which could not be used in the regeneration of the chemical heat accumulation material in one system is utilized for evaporation of a reaction medium in the other unit. Disclosed also is a method of operating this system.

Heat accumulation system and method of operating the same

A heat storage device is disclosed in which grooves for supports supporting heat storage vessels, each vessel storing therein a heat storage material, are defined on the lower surface of each of the vessels so that the supports do not project from the bottom surface of each vessel.

Heat storage device

The present invention relates to a heat storage material for air conditioning or for waste heat recovery, principally containing magnesium chloride hexahydrate which is doped as a nucleator with synthetic zeolite, magnesium silicate, sodium metasilicate, sodium silicate, calcium silicate, alumina, silicic anhydride, silicon carbide, calcium carbonate and/or calcium fluoride, whereby the heat storage material can be effectively used over a long period of time.

Heat storage material

A heat storage material is produced by adding water and slight amounts of substances for agglomerating residuals to industrial grade calcium chloride.

Heat storage material and process for producing the same

A heat-storing vessel filled with a heat-storing material of latent heat type is provided with a fluid flow passage in thermal contact with the heat-storing material for passing a fluid for storing and releasing heat. By passing a hot fluid through the fluid flow passage, the heat-storing material in the heat-storing vessel is melted to store heat. By passing a cold fluid through the fluid flow passage, the heat-storing material in the heat-storing vessel is solidified to release heat. The heat-storing material contains a gelling agent to suppress a phase separation phenomenon. A low temperature part is provided at a part of the heat-storing vessel and the heat-storing material containing the gelling agent is retained in a solid state at the low temperature part to prevent supercooling of the heat-storing material.

Heat-storing apparatus

A heat pipe is provided with a multiplicity of longitudinal deep grooves and ridges formed in the inner peripheral surface thereof. A plurality of shallow grooves are formed by a plastic work in the top surfaces of the longitudinal ridges separating the deep grooves. Parts of burrs formed as a result of the plastic work for forming the shallow grooves are extended over the deep groove so as to form bridges connecting adjacent ridges over the deep grooves.

Method of producing heat pipe

A heat storage material to be used for air cooling systems is provided. This heat storage material comprises acetic acid or a mixture of acetic acid and one or more acetates and is further added with at least one anhydrous halide as nucleating agent to prevent supercooling.

When strontium oxide is applied as a nucleating agent to calcium chloride-hexahydrate as a heat storage material, a supercooling phenomenon of the resulting heat storage material can be suppressed to be slight.

A printing apparatus including a plurality of drive coils for driving printing hammers arranged longitudinally in side-by-side relation at one side of a core of the U-shape. A first cooling fluid passageway is defined inside the core of the U-shape to allow a cooling fluid for cooling the drive coils to flow therethrough, and a second cooling fluid passageway is defined outside the core by a duct to allow the cooling fluid for cooling the drive coils to flow therethrough without escaping to the outside by diffusion. A current of cooling fluid is forcibly fed into these cooling fluid passageways by a fluid machine.

Printing apparatus with cooling of hammer printing coils

Supercooling of sodium thiosulfate pentahydrate is prevented by adding thereto naphtharene or naphthol and/or at least one of calcium sulfate, potassium chloride, sodium chloride, potassium bromide, sodium bromide, potassium iodide, and sodium iodide, or a pyridine.

Heat-storing composition

A heat-storing composition comprising acetic acid and at least one of sodium acetate, ammonium acetate, potassium acetate and calcium acetate works at a desired temperature in a temperature range of 5.degree.-20.degree. C. and is chemically stable with a high heat-storing capacity.

A heat exchanger for cooling is immersed in a vessel for storing heat filled with a heat-storing material of latent heat type. The heat exchanger for cooling is positioned at an upper level in the vessel when a heat-storing material having a higher specific gravity in a crystal state than in a liquid state, such as calcium chloride hexahydrate, is used, whereas at a lower level in the vessel when a heat-storing material having a lower specific gravity in a cystal state than in a liquid state such as water, is used. Crystals of a heat-storing material formed and deposited on the outer periphery of the heat exchanger for cooling when the apparatus for storing heat is in operation are accumulated in the vessel for storing heat as blocks.

Apparatus for storing heat

A ventilating system including a heat exchanger utilizing boiling and condensation of a liquid mounted in a cabinet formed with a first air passage and a second air passage by a partition plate extending horizontally across the heat exchanger substantially in the center thereof. At least one air sucking and exhausting fan is mounted in one of the first and second air passages, and the heat exchanger is provided with at least one auxiliary heat exchanger operative to perform space cooling or space heating. The first and second air passages are each provided with ventilating ports for effecting heat recovery, ventilating ports for effecting cooling by ventilation and a ventilating port for allowing cooled air or heated air to flow therethrough, so that the ventilating system can be operated in a heat recovery mode, a cooling by ventilation mode and a space cooling or space heating mode by actuating the auxiliary heat exchanger and suitably opening and closing various ventilating ports.

Growing community of inventors

Hachioji, Japan

Michio Yanadori