Refrigeration Applications Utilizing Liquid Desiccant Dehumi
Refrigeration Applications Utilizing Liquid Desiccant Dehumidification Systems (2017) - The primary design for process air handling systems for the food and beverage industry is to use conventional cooling and reheat coils with a distributed refrigeration system. Often defrost is incorporated for coils operating at subfreezing temperatures. Occasionally desiccant wheels may be incorporated into the air handling unit or standalone systems to provide latent control to limit the amount of defrost required. One common drawback of the aforementioned designs is that they add heat to the refrigerated space. Defrost adds heat and moisture that ultimately adds load to the refrigeration system, and desiccant wheels add heat to the supply air stream supplied to the refrigerated space. In addition to the added heat, often the primary refrigerant is distributed to the air handling unit or fan coil that may be installed inside the space. A liquid desiccant system can provide cooling for the refrigerated space and eliminate the need for defrost. This paper explains three different scenarios where a subfreezing (<32°F, 0°C) refrigerant is used to provide cool, humidity-controlled process air with a liquid desiccant system. Each of these cases includes a discussion on how the installation’s primary refrigerant is utilized and designed. The first case is a brewery’s fermenting cellar, the second is a meat cooler and packaging space, and the third is a cold storage staging area application.
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