3, air-conditioning design should be based on return water temperature difference between summer and winter water for a reasonable set of dynamic balance valve
Control air-conditioning systems in the four balance valve with both winter and summer is to meet the different requirements of water, when the winter and summer air-conditioning heating sections, cold water temperature is not at the same time, significant differences in water flow, water in the two control systems should be in accordance with Winter and Summer in different settings Valve flow requirements: a way to set up Dynamic Variable Valve flow, summer and winter season when the converter valves.
Method II, set up two balance valve, valve 1 by the choice of the winter flow valves, valve 2 by the summer and winter, the largest difference between the choice of water, valves, valve 1 in winter, summer two valves, two valves to achieve air-conditioning the four control functions. Method III-controlled device with a dynamic balance valve flows through the computer. Otherwise, air-conditioning in summer due to water flow in winter is different and simple to set up in the air conditioning fixed end of the dynamic flow balance valve is not possible to meet two of the water balance of the season.
6, dynamic balance valve design example works
1, project
Located in Beijing's bustling King Street down well commercial market, is from Beijing Dong'an Group and Sun Hung Kai Real Estate Development Co., Ltd. joint venture to build the project, covers an area of about 21400m2. Large-scale construction projects, construction plane is divided into A, B, C, D in four areas, including A, B, area market segments; D areas for the dynamic part of the move-back city. Floor, six on the ground, on the podium for the tenth floor office.
Market旧西危total load of frozen room 10450RT (about 36750KW).
Air-conditioning chilled water from the ground floor of three rooms at ground floor two primers. In order to reduce the non-commercial area. Water system for the next time for the next two-pipe system, different programs. The second floor from the ground to the 20 air-conditioned well water pipes.
Water fan-coil system in accordance with the load characteristics of the construction is divided into areas within and outside the two loops area. For chilled water within the district, outside the district heating water in winter. According to the indoor climate and in line with the situation, through the building automation system in the two-story underground shaft electric switch controlled by the extracellular region of cold water dual, hot water switch.
2, air-conditioning program designed to balance valve
For chilled and frozen pump unit is, in order to avoid a variety of factors contained in the occurrence of partial load, in the freezer and set the water flow on the secondary pump outlet Valve installed.
Market as a result of the construction plane large, and require the owners and architects "golden land" effective area of the high rate of business, premises and equipment, tube wells, therefore the small size and its location is also a negative, so that the vertical reach of 108m, the horizontal cross-270m the pipeline system, pipeline system, the resistance balance and debugging is very difficult. In order to solve the water system "long pipeline is difficult to balance" the difficulties of the design process to develop a balanced program of two sets.
Program One: a multi-polar set general installation of water pipes Crosshole Valve
① is in charge of line with the 20 wells installed heating pipes Valve
② installed in the shaft export balance valve
③ in each box to install air-conditioning Valve
④ tenants in each of the balance valve installed on outlet
Option II: Using Dynamic Balance Valve
① The fan coil unit is installed on the end of balance valve
② air-conditioned box at the end device is installed on balance valve
Tested compared to the final adoption of the balance valve is
① me the end of the installation of air conditioning and automatic control valves Valve
② retail and office space within two or three fan-coil combination of a balance valve and control valve, fan coil units in each office outside the area occupied and controlled a balance valve valve
3, the application of the Aggregate Balance Valve
① long pipeline system different way to install multi-level balance valve price is higher than the general level of dynamic balance valve terminal equipment.
② the end of the device in the dynamic balance valve installation, maintenance, when the scope of the impact of small, air-conditioning equipment and start and stop the tenants affected.
Dynamic balance valve ③ own filters, to avoid the water system on line in the dirt-controlled valve damage.
④ Because of the dynamic pressure balance valve for a certain period within the scope of error of only ± 5%, the more equipment on or off the flow of the other equipment is almost no impact to ensure that the end of the stability of water flow devices.
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