| 摘要 |
A solar heating system has a solar heat collector (14) in which water (12) is heated and which is connected by conduits (20, 22) to a heat exchanger (16) for heating a domestic hot water system or to a swimming pool. The collector is located at a higher level, such as the roof of a house. Circulation of liquid is ensured by means of a vapor (24) generated inside the collector (14), with a lift tube (30); the vapor is cooled in a condenser (41) above the collector, by heat-exchange with the water also lifted in the lift tube, and which then returns by a conduit (46) to the collector. The system is arranged so that the interior of the collector is under reduced pressure so that the water boils at below normal boiling point, by a column of water of height 7.25 metres in a vertical conduit (34) the top (28) of which communicates with the inside of the collector and the bottom of which (60) may be open to the air (62) or closed, whereby the column of water and conduits (20, 22) can be shorter. Two lift tubes may be provided for greater pumping efficiency. An extra cooling chamber can be provided, communicating with the condenser (41). |
