| 摘要 |
<p>A refrigeration system comprises a compressor (1) and a condenser (2), between which there is arranged at least one evaporator (4) which at its input side has a controllable injection valve (5). A control device (7) which is connected to temperature and/or pressure sensors (8, 9, 11) on the input side and output side of the evaporator and actuates the injection valve (5). The desired value of the superheat temperature of the evaporator (4) is modified in dependence upon the degree of opening of the injection valve (5). Because of fluctuations in load the evaporator may become completely filled with liquid refrigerant. In order to activate the evaporator (4) quickly the control device (7) alters the correlation between the superheat temperature and the degree of opening of the injection valve (5) when the injection valve (5) falls below a predetermined degree of opening. Either the valve (5) can be prevented from closing completely or, after closing, a more rapid re-opening effected. <IMAGE></p> |
