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Title: Desiccant cooling using unglazed transpired solar collectors

The use of unglazed solar collectors for desiccant regeneration in a solid desiccant cooling cycle was investigated because these collectors are lower in cost than conventional glazed flat-plate collectors. Using computer models, the performance of a desiccant cooling ventilation cycle integrated with either unglazed transpired collectors or conventional glazed flat-plate collectors was obtained. We found that the thermal performance of the unglazed system was lower than the thermal performance of the glazed system because the unglazed system could not take advantage of the heat of adsorption released during the dehumidification process. For a 3-ton cooling system, although the area required for the unglazed collector was 69% more than that required for the glazed collector, the cost of the unglazed collector array was 44% less than the cost of the glazed collector array. The simple payback period of the unglazed system was half of the payback period of the glazed collector when compared to an equivalent gas-fired system. Although the use of unglazed transpired collectors makes economic sense, some practical considerations may limit their use in desiccant regeneration. 8 refs.
Authors:
 [1] ;  [2]
  1. (National Renewable Energy Lab., Golden, CO (United States))
  2. (Stanford Univ., CA (United States))
Publication Date:
OSTI Identifier:
5248558
Report Number(s):
NREL/TP-432-4827; CONF-920678--6
ON: DE92010568
DOE Contract Number:
AC02-83CH10093
Resource Type:
Conference
Resource Relation:
Conference: National solar energy conference, Cocoa Beach, FL (United States), 13-18 Jun 1992
Research Org:
National Renewable Energy Lab., Golden, CO (United States); Stanford Univ., CA (United States)
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; BUILDINGS; COOLING SYSTEMS; DESICCANTS; COOLING; UNGLAZED SOLAR COLLECTORS; PERFORMANCE; COEFFICIENT OF PERFORMANCE; EMISSIVITY; ENERGY EFFICIENCY; INSOLATION; USES; EFFICIENCY; EQUIPMENT; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; SOLAR COLLECTORS; SOLAR EQUIPMENT; SURFACE PROPERTIES 141000* -- Solar Collectors & Concentrators; 320106 -- Energy Conservation, Consumption, & Utilization-- Building Equipment-- (1987-); 320107 -- Energy Conservation, Consumption, & Utilization-- Building Systems-- (1987-)