Plate heat exchangers in absorption lithium bromide thermal transformers
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Energy efficiency of absorption lithium bromide thermal transformer depends on the depth of heat recovery in solution heat exchanger. In the article shell-and-tube and plate heat exchangers used in the absorption lithium bromide thermal transformers are compared. The appropriate design of plate heat-exchanger prototype with плоскимипластинамиis presented, which is the basis for the development of heat-exchangers with the plates with convex-concave turbulizing surfaces. The evaluation of thermal-hydraulic characteristics of plate heat-exchangers has been made; the efficiency of their using in thermal transformersis shown. The optimum characteristics of the purpose-built plate heat transformersfor Russianabsorption lithium bromide thermal transformerare determined. Forabsorption lithium bromide thermal transformer withone-stage desorption system the recommended channel height of weak solution path in plate heat-exchangeris proved to be not less than 3.0 mm, and forabsorption lithium bromide thermal transformer withtwo-stage desorption system – not less than2.0 mm. ForABHM-1000Vnindustrial refrigerating machine withone-stage desorption the characteristics of the recuperative heat-exchangers current in use and the upcoming ones are compared. It is shown thatwhen using plate heat-exchangers with flate plates refrigerant saving is 15% in relation to the total refrigerant amount loaded into absorption lithium bromide thermal transformer; metal and labour savings for manufacturing absorption lithium bromide thermal transformer in relation to total weight is 5%.
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