Due to the increase of heat load, the cooling system of industrial chiller is changed, the premise is that the air volume and the heat exchanger of the industrial cold water machine are constant, and the heat sink temperature is constant. The instantaneous load of the hot side increases, which is equivalent to the increase of the instantaneous heat source temperature. So in the industrial cold water machine evaporation temperature has not changed, the evaporation side heat transfer temperature difference will increase, resulting in instantaneous heat absorption of the evaporation side of the increase, the increase of heat, compressor exhaust temperature.
The increase of heat absorption due to the hot end brings more load to the condensing side. The sign of this inference is the increase of the instantaneous exhaust temperature of the compressor. On the other hand, expansion valve feedback and superheat increased resulting in valve moves down, for the improvement of fluid volume leads to the increase of the evaporation temperature, industrial cold water machine system as a whole by hindering the evaporation side for temperature increase to offset the transient heat load to increase the effect of the whole system, further to achieve the new balance. The outward sign of this inference is that the increase of the evaporation side pressure can be measured.
Many people may say that the evaporation temperature increase is to improve the industrial chiller cooling coefficient, but this is one-sided, especially in the condensation side of the heat exchange itself is a short board. Unit cooling capacity increases at the same time with the increase of the mass flow of the common role of industrial water cooling machine side of the heat transfer increase, the compressor side of the increase in power consumption due to mass flow also increased. These two aspects of the load need to be discharged through the condensation side. Does not have in the large amount of wealth in the industrial chiller condensing system side, often condensation temperature will improve (industrial chillers system condensation side through increased with the temperature difference between the heat sink side to achieve a greater quantity of heat), in accordance with the isobars in pressure enthalpy diagram after cooling and condensation process is bound to bring throttle system dry degree increased, whereas hindered the industrial chiller unit refrigerating capacity further increase also reached a new balance.
At this point, the external sign can be obtained by increasing the volume of the condensation pressure. Therefore, in many cases, for a given design condition under the existing system, evaporation temperature rises will bring greater power to industrial chillers system, to the condensing end bring greater load, often outweigh the benefits. Through the above analysis, it is not difficult to find, with the increase of instantaneous load in hot end, often can see above the external manifestations of: industrial chillers exhaust temperature, improve condensing pressure, evaporating pressure increase and due to the self balance to changes in the outside world feedback the will to achieve the balance under the new condition of industrial chiller system. Of course, if the condenser design margin is likely not system in the process to achieve a new equilibrium state in the fall protection. East Star Refrigeration