Method for controlling top-up required at a heat storage unit in a solar energy system registers the solar yield by upper and lower thermometers at the storage to give the temperature changes by time units

摘要

Nominal value of hot water temperature is set by a control according to the actual solar yield and/or the stored energy in the heat storage (2). The solar yield is determined by temperature sensors (8,9) at the lower and upper zones of the heat store (2), to give the temperature changes per time unit for cumulation. If the addition is positive, the nominal value for the hot water temperature is lowered by an appropriate amount together with a multiplication of an economy factor if required.