INDIRECT EVAPORATIVE COOLING OF A GAS USING COMMON PRODUCT AND WORKING GAS IN A PARTIAL COUNTERFLOW CONFIGURATION

摘要

An indirect evaporative cooler includes a number of heat transfer plates (6). Each plate has a wet side (10) and a dry side (9), and the dry sides of adjacent plates face each other. The plate dry sides hive low permeability to an evaporative liquid. Input air (12) flows over the dry sides from an input end to an output end. Part of the input air becomes product air (1) and exits at the output end. The rest of the input air passes through perforations (11, 13, 14) in the plates to the other side of Íthe plates to become working air (2). The other side of each plate is a wet side, which is wet by an evaporative liquid. Working gas flows over the wet side, evaporating the evaporative liquid and cocbling the evaporative liquid, the plate, and finally the product gas by heat transfer. The perforations are formed both toward the input end of the plate and toward the output end of the plate. Part of the wet side of the plate, toward the output end of the plate, has a plurality of barriers (15) placed to cause the working gas at that end of the plate to flow in a direction generally counter to the input air.