Optimization And Application Researching Of Separate Power Systems

In the heating and air-conditioning projects, selecting the power separated method, dispersing the power to various branch circuits, can reduce even eliminate regulating valve energy consumption. This way may reduce system transportation energy consumption substantially. This is a new energy conservation technology which in the heating and air-conditioning domain appeared in recent years.This article has carried on the deeply analysis about reasonable dispersion degree of the separate power system, selecting zero-pressure points, determining the lift of the pump as well as hydraulic stability.First, use a structure's example to compute and analyze on the transportation energy consumption of the reversed return system, direct return centralized power system and the separate power system. The regulating valve energy consumption of the reversed return system with power centralism way are few, therefore the fractional energy savings of this system is low. But the reversed return system increased the same regulation tube,which increase the main energy consumption. The computation result indicated that the transportation energy consumption of the direct return separate power system is lower than the reversed return centralized power system obviously, and may save the main investment.Next, obtain through the theoretical calculation, increasing range of the fractional energy savings, which along with the system power dispersion degree raise, depend on the system itself, but often is reduction. And the pump quantity is actually increases largely. Therefore dispersing the system power to the terminal procedure is unreasonable. The correct procedure is overall evaluating fractional energy savings, as well as, the project investment, the systems control, the running attention, the noise and so on a series of questions, to definite system power dispersion degree.Then, using the pressure diagram to select and compare the zero-pressure point of the separate power system. Has given the critical point definition: the critical point is the special zero-pressure point, which the zero-pressure point takes at this point the system just completely eliminates regulating valve's energy consumption. In the separate power system the zero-pressure point must before the critical point, which can cause the system to eliminate the regulating valve energy consumption, and causes the system transportation energy consumption to be lowest. The zero-pressure point at the different position before the critical point, pump disposition plan are almost different, but pump output total power are the same. using the pressure diagram can conveniently determine the zero-pressure point of the separate power system as well as the lift of pump. Finally, has carried on the computation and the analysis on the hydraulic stability of the separate power system. The result indicated that the hydraulic stability of the separate power system surpasses the power centralism system obviously, and the more approaches cold (heat) source, the hydraulic stability the better.