From the test sequences obtained for QD test method, test periods according to SS test method conditions were selected and the parameters of efficiency curve determined (equation (3)). The values determined are listed in Table 2. Table 2: Parameters of efficiency curve according to SS test method Л0 a1 a2 0,688 4,140 0,005 Comparison of […]

As can be seen from the title of the standards, the thermal solar systems have been divided into two groups: “factory made systems” and “custom built systems”. This division was necessary in order to be able to include the whole spectrum of thermal solar systems in Europe, which ranges from small compact systems (thermo-siphon and […]

This program was developed on Labview platform. Labview operating system is the most representative system in the field of graphical programming development platform using virtual instruments. And it is also the most popular and extensive application of data acquisition and control of the development environment. The program will be intuitive and have friendly interface with […]

The experiments are carried out in a domestic hot water tank and a space heating tank. Both tanks are of steel and have a volume of 400 litres with an internal height of 1.4 metres. In the domestic hot water tank, fresh domestic water with high natural lime content, usual for Danish conditions, is led […]

In addition to the performance characterisation in the European standard EN 12976-1 many requirements are set up regarding safety, reliability and durability of thermal solar systems. Their objective is to ensure that the systems operate reliably, even under extreme conditions such as heavy snow or wind loads or extended stagnation periods during the summer. In […]

The PET samples became brittle and degenerated already after 10 years of exposure. In the case of PVC high losses in transmittance were observed, but mechanical destruction occurred only after 20 years. These samples showed a colour change over yellow and brown to a non-transparent black. This effect was accelerated when exposed under a protective […]

Figures 2a) and 2b) illustrate, for both measurement periods, measured (Qmeas) and calculated instantaneous power values, after both steady-state efficiency parameters (uncorrected – Qss – and corrected – Qss corr – calculations), form Eqs.(3) and (5), and dynamic (Qdyn ) efficiency test parameters, after Eq.(4). 1st International Congress on Heating, Cooling, and Buildings – 7th […]

Table 2 shows a comparison of the present requirements of the methods of impact resistance tests of the transparent cover of solar thermal collectors and pv-modules which directly influence the energy transmitted during the impact and thus also the damage potential. Only requirements concerning tests with ice balls and no steal ball tests are listed. […]