Quasi-Dynamic Testing of Thermal Sun Air Collectors and Numerical Simulations of a Cold District Heating Network
Abstract
So-called thermal sun-air-collectors increasingly available on the market are mostly uncovered absorbers without thermal insulation. Hence, their thermal performance is significantly affected by ambient conditions such as wind speed, sky or air temperature (Giovannetti et al., 2018). In order to model the thermal performance of sun-air-collectors, it is necessary to know, among other things, how the above-mentioned ambient conditions affect their thermal performance (Leibfried et al., 2019). For this purpose, the thermal performance of a sun-air-collector available on the market was determined in two variants according to ISO 9806 (ISO, 2013) by means of outdoor testing using the quasi-dynamic test method. The characteristic values resulting from the measurement are then used within an annual system simulation of a typical cold district heating network in the simulation environment TRNSYS. Whereas the sun-air-collectors in combination with an ice store act as heat sources for heat pumps in the heating and cooling supply system.