By Adrianus Dekker
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In terms of primary energy, 15% (300 kWh) is used for pump energy. Regulating the pump speed reduces annual power input by 50%. The pumping height of a standard heating pump is relatively small, a maximum of 4–5 m. When using such pumps, de-aeration of the collector circuit at its highest point is important for the operation of the system. 1 m³/h, so the breather, which is usually difficult to access, is unnecessary, and the initial air cushion can be fully squeezed out of the collector circuit.
In order to eliminate the deterministic proportion of the irradiance on the earth's surface, which is determined by extraterrestrial irradiance and the respective position of the sun, the clearness index is used as a statistical variable. The clearness index kt is defined as the relation of terrestrial to extraterrestrial irradiance on a horizontal surface, calculated for one hour or totalled over the hours of a day or month. 24) eh From the given monthly clearness index, as a first step daily values are produced by a autoregressive procedure, and afterwards hourly values are calculated.
28) The empirical probability function P(Xd) determined by Gordon and Reddy describes with good accuracy the distribution of the daily clearness indices. The only parameter is the standard deviation of the daily values σXd for the respective location, which depends only on the monthly average value ktm . 15: Gordon–Reddy distribution function of the standardised daily clearness indices around the monthly average value as a function of the variance σ². 1, the daily clearness indices above the monthly average value (Xd = 1) drop very sharply.
Electrical Engineering Materials by Adrianus Dekker