OPERATING METHOD FOR A SOLAR COLLECTOR PLANT, AND CONTROL UNIT FOR A LIQUID PUMP IN A SOLAR COLLECTOR PLANT

摘要

A solar collector plant having a radiation absorber (1) with a number of channels for conducting heat receiving liquid, said channels accommodating particles for capillary effect lifting of the liquid to an effective sweeping of the sun-facing surface layer of the absorber, is started after a prolonged operation standstill by driving a liquid pump (7) intermittently by means of a control unit (13) acting according to a clock-controlled program. In the intermittent start-up phase, first the pump (7) is driven for 2-4 minutes, thereafter it is shut down for a time span of about 20-60 seconds, and this is repeated two or three times before a continuous operation phase is started. Thereby air in the absorber (1) channels is expelled more rapidly.