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72results about How to "Lower manufacturing unit price" patented technology

Defrosting operation method for heat pumps

The invention relates to a kind of defrosting technique by a caloric pump, including: the heating operation that the cold-producing medium passes through a reversible valve which is connected to the compressor, and then takes turns to flow pass the indoor heat exchanger , electronic dilating valve, container, extraventricular heat exchanger ; the defrosting operation that switches to the refrigerating operation via a reversible valve to remove the frost in the extraventricular heat exchanger; and the defrosting-relieving operation after the defrosting operation that switches to the heating operation again. the defrosting operation said above is made up of the process that by reducing the frequency of the compressor to the minimum to minish the pressure difference of the caloric pump system under the context of opening the electronic dilating valve completely, and the process that after switching the reversible valve according to the cold-producing model raising the frequency of the compressor to the maximum to remove the frost. the defrosting-relieving operation said above is made up of the process that reducing the frequency of the compressor to the minimum to minish the pressure difference of the caloric pump system when the temperature sensor which is installed outside the extraventricular heat exchanger's tube examines the condition satisfied with that of the defrosting-relieving operation and the process after the defrosting operation closing the electronic dilating valve completely as well as switching the reversible valve according to the heating model, and the process that increasing the frequency of the compressor and the electronic dilating valve in turns .
Owner:LG ELECTRONICS (TIANJIN) APPLIANCES CO LTD

Metal separator for fuel cell, and fuel cell stack provided with same

The present invention relates to a metal separator for a fuel cell, and a fuel cell stack provided with the same, wherein the metal separator for a fuel cell comprises: a channel portion comprising reaction gas channels which are formed at the center and are protruded from a first surface to a second surface, and a cooling water channel which is formed between reaction channels protruded at the second surface; a metal main body portion which is integrated with the channel portion at the four side edges of the channel portion and has openings which penetrate the first surface and the second surface and are formed at the two side surfaces facing each other; a polymer manifold-gasket assembly comprising a manifold portion which is formed as a divided space at the openings for the supply and discharge of a reaction gas and cooling water, and a gasket which is integrated with the manifold portion at the edge of the metal main body portion and a region required for sealing; and reaction gas inflow / outflow holes which are integrated with the manifold-gasket assembly. By the configuration, the present invention enables a smoother flow of the reaction gas and cooling water flowing through the reaction gas channels and the cooling channel, obtains stiffness of a metal separator, and improves the durability of a metal separator.
Owner:HYUNDAE STEEL CO LTD
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