Supply Temperature Stabilization of Decentralized Solar Thermal Collectors for Integration into District Heating and Cooling System
Abstract
The solar thermal collector with return/supply connection to the district heating through a heat exchanger with a 3-way valve for temperature control was investigated. The study of supply temperature fluctuations and stabilization possibilities in northern climatic conditions was performed by an energy simulation software package and a test facility with flat plate and vacuum thermal collectors. Here we report the experimentally discovered temperature fluctuation in different working regimes (required heat carrier supply temperature 80°C, 65°C, 50°C, 30°C) and different weather conditions (sunny and cloudy), as well as analyze the potential of using solar collectors for radiative cooling during the night period and present the computer model validation results.