Vakuuminių saulės kolektorių efektyvumas pereinamuoju kalendoriniu laikotarpiu

Abstract

Efektyvus saulės kolektorių panaudojimas pereinamuoju kalendoriniu laikotarpiu– sudėtinga problema. Geografinės ir klimatinės sąlygos riboja galimos transformuoti energijos kiekį. Tuo tarpu bendras energijos poreikis nemažesnis negu vasarą, nes energija reikalinga ir patalpoms šildyti, ir šiltam vandeniui ruošti. Naudojamų kolektorių konstrukcijose paprastai išnaudoti visi techniniai rezervai. Todėl kolektorinės sistemos efektyvumo didinimas, parenkant optimalius darbo parametrus sumontuotai sistemai, ypač svarbus

The article describes tests of vacuum tube solar collectors used in heating systems. The object of the test was the solar vacuum tube collector system made by WATT (total surface area - 6,42m²). A 2kW electrical heater was used to compensate for output shortages. The test was conducted in accordance with the current standards. The results have indicated that mid-range quality vacuum tube collectors are in the same class as flat-panel collectors in terms of the return on investment. The actual coefficient of efficiency is 0,40-0,42, while the value declared by the manufacturer is 0,54. An effective application of such systems is possible only if regulators with adaptive mode settings are used, and each installation is customized. Their use in heating applications is rational only for low-temperature systems or for freezing prevention. An average daily amount of converted energy is 13kW/h throughout a transient period. In order to guarantee reliable self-cleaning of snow and ice the angle of installation must be steeper than 30º