| Abstrakt: |
The operating characteristics of solar collectors made of cellular polycarbonate plastics for adsorption chilling units have been studied. Instantaneous efficiency coefficient is calculated as special thermal performance-solar radiant flux surface density ratio, optical efficiency factor is determined as special thermal performance-solar radiant flux surface density ratio at the equal temperatures of heat transfer medium and environment, reduced heat loss factor being calculated as the product of solar collector efficiency factor and net heat loss coefficient. The environmental test of developed collectors PSK-AV2-3, PSK-AV1-2, PSK-AV2-1, PSK-VS1-2, PSK-VS2-2, PSK-VS2-3, PSK-ST10-PW were conducted. The correlation of their results with laboratory tests when the thermohydraulic stand applied is shown. Relative accuracy of laboratory and environment tests is shown to be not exceeding 5 - 7 %. The determined optical efficiency factor and the coefficient of thermal losses of polymeric solar collectors, % and W/m2•K: PSK-AB2-3 59 and 0,97, PSK-AB1-2 76 and 4,44, PSK-AB2-1 - 86 and 8.65, PSK-VS1-2-75 and 4.11, PSK-VS2-2-75 and 4.13, PSK-VS2-3-59 and 0.75, PSK-ST10-PW-64 and 4.99. On the basis of the dependencies of the efficiency of the solar collectors vs. the reduced temperature, optimal designs of the polymeric solar collectors for the adsorption chilling solar systems are determined to be depended on the temperature of the regeneration temperature of the sorbents. As the temperatures of the regeneration of composite sorbent ranged from 50ºС to 60ºС, appliance of the collectors PSK-AV2-1, PSK-CT10-PW is shown to be expedient to use type, and PSK-AB2-3, PSK-VS2-3, PSK-AB1-2, PSK-VS2-2 and PSK-VS1-2 are revealed to be more efficient when regeneration temperatures increased over 80 ºС. Thermotechnical characteristics of designed polymeric solar collectors are shown to exceed traditional metal and vacuum collectors at the reduced temperatures less than 0.06 m2•K /W. The perspectives of polymeric solar collectors in the design of adsorptive chilling solar plants are shown. [ABSTRACT FROM AUTHOR] |
