Mayekawa Mfg. Co., Ltd.

Iwao Terashima

Takashi Nemoto

Akira Taniyama

Shinjirou Akaboshi

Makoto Sano

Choiku Yoshikawa

Masato Takeda

Yasushi Tomiyama

Daiki Kayashima

A refrigerant heat exchanger is provided and includes: a hollow container having a cylindrical shape; a plate stack disposed on an inner lower side of the hollow container, including plates each having a front side and a back side with a plurality of concavo-convex portions formed thereon which are stacked to form a first heat exchange flow passage through which a first refrigerant flows and a second heat exchange flow passage through which a second refrigerant flows; a supply pipe disposed in an interior space of the hollow container above the plate stack and configured to supply the first refrigerant to the plate stack; and a discharge pipe configured to exchange heat between the first refrigerant supplied from the supply pipe and the second refrigerant flowing through the plate stack and to discharge the first refrigerant.

Refrigerant heat exchanger

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

An ammonia/COrefrigeration system is provided in which the ammonia cycle and CObrine cycle can be combined without problems even when refrigeration load such as refrigerating showcase, etc. is located at any place in accordance with circumstances of customer's convenience. The system comprises apparatuses working on an ammonia refrigerating cycle, a brine cooler for cooling and condensing COby utilizing the latent heat of vaporization of the ammonia, and a liquid pump provided in a supply line for supplying the cooled and liquefied COto a refrigeration load side cooler, wherein said liquid pump is a variable-discharge pump for allowing COto be circulated forcibly, and the forced circulation flow is determined so that COis recovered from the outlet of the cooler of the refrigeration load side in a liquid or liquid/gas mixed state.

[object Object]

An ammonia/COrefrigerating system having a liquid pump for feeding the liquid COcooled in a brine cooler by the utilization of the vaporization latent heat of ammonia in an ammonia refrigeration cycle to a cooler, which comprises a liquid receiving vesselfor receiving a CObrine cooled in a brine cooler, a liquid pumpcapable of changing the rate of the feed of a liquid, a rising pipingprovided between the liquid pumpand a cooler, and a communication pipefor communicating the top of the riser pipewith the COgas phase in the liquid receiving vessel, wherein the discharge pressure of the liquid pumpis set so as for the COrecovered form the cooleror the liquid receiverin the state of a liquid or a gas-liquid mixture, and the level of the rise in the rising pipingis set at a level being the same as or higher than the highest storage level for the CObrine in the liquid receiving vessel. The above ammonia/COrefrigerating system allows a refrigeration cycle of a combination of an ammonia cycle and a COcycle to be formed with no care, even when a refrigerating showcase, which is the cooler side of the COcycle, is installed at an arbitrary place.

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Tokyo, Japan

Iwao Terashima