a method for running a cooling water pump

摘要

The defrosting of the evaporators by means of hot high pressure liquid from the compressor has previously been done either by reversing the plant that is alternating use of the condensers as evaporators and evaporators as condensers and vice versa or by doubling the evaporators, one of them being active while the other is defrosted. There are disadvantages with both systems and the purpose of the invention is to eliminate these disadvantages and to provide a plant which is simple as far as construction and operation is concerned and which gives a high average factor a year for the heating effect emission. This has been achieved by the fact that the evaporators (21, 22), which are to work as heat emitters at defrosting are essentially completely emptied from the refrigerant, which after compressing and condensing is stored in a container (15). The defrosting of the emptied evaporator(s) (21, 22) is done by means of refrigerant condensate under high pressure from the container (15), and supercooled condensator is added to the evaporators, being under heat-absorption, from the defrosted evaporators via an operation container (17). Refrigerant condensate is also led via the operation container (17) to the one or those evaporators (21, 22) intended as heat absorbers and/or heat emitters.