Membrane type dew point indirect evaporative cooling heat exchanger

Abstract

The invention discloses a membrane type dew point evaporative cooling heat exchanger in the technical field of heat exchangers. The membrane type dew point evaporative cooling heat exchanger is internally provided with first heat exchanging membranes and second heat exchanging membranes all of which are overlapped in an alternate manner, wherein a hydrophilic face of each first heat exchanging membrane and a hydrophilic face of the corresponding second heat exchanging membrane are oppositely arranged to form a wet heat exchanging channel layer, and a hydrophobic face of each first heat exchanging membrane and a hydrophobic face of the corresponding second heat exchanging membrane are oppositely arranged to form a dry heat exchanging channel layer; and a first foldable cavity face and a second foldable cavity face are combined at the semi-opening ends of the wet heat exchanging channel layers to form a water inlet and outlet cavity and are closed at the dry heat exchanging channel layers. By means of the membrane type dew point indirect evaporative cooling heat exchanger, mixing of countercurrent and cross-flow can be achieved, meanwhile, by improving cross section structures of thedry heat exchanging channels and the wet heat exchanging channels, while the relative small heat exchanging temperature difference is guaranteed, the flowing pressure drop is reduced, and the heat exchanging efficiency is improved.

Description

technical field [0001] The invention relates to a technology in the field of heat exchangers, in particular to a membrane-type dew point indirect evaporative cooling heat exchanger. Background technique [0002] The dew point indirect evaporative cooling system obtains cooling capacity through heat and moisture exchange between water and air, and can provide air close to the dew point. It has the advantages of simple structure, few moving parts, and high energy efficiency ratio. However, the dew point indirect evaporative heat exchanger Heat transfer efficiency and higher manufacturing cost compared to direct evaporative heat exchangers are important factors that hinder the widespread use of this system. [0003] At present, most dew point indirect evaporative heat exchangers are of plate-fin structure, including: longitudinal dry air channels and horizontal wet air channels; by setting small air holes in the middle of the longitudinal dry air channels, the air flowing throu...

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Problems solved by technology

[0006] Aiming at many defects and deficiencies existing in the prior art, such as excessive resistance of the external shunt hole, uneven temperature field, complex structure of the heat exchanger, and difficulty in meeting the requirements of heat exchange efficiency, the present invention proposes a diaphragm type dew point indirect The evaporative cooling heat exchanger, by improving the cross-sectional structure of the dry-wet heat exchange channel and setting an asymmetric dry-wet heat exchange channel, can realize the mixing of counterflow and cross flow, and reduce the flow pressure drop while ensuring a small heat exchange temperature difference. Improve heat transfer efficiency

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