Hvac in the circulating water system, for the same - a cold heat source to multiple areas at the same time cold (hot) system, hydraulic disorder is the most common problems. System due to hydraulic misadjustment the reasonable flow rate distribution, the excess flow areas of flow is insufficient, some area in some areas winter is cold, summer is warm, unreasonable system conveying cold, heat, in order to solve this problem, the pump head and flow rate can be improved through to the solution

Uneven, but will produce: cold, heat and more electrical energy wasted. Therefore, must adopt corresponding regulating valve door system flow distribution. Although some common valves such as cut-off valve, the net also have -- 2 adjustment ability, but due to its poor regulation performance and switch can't post-holiday flow measurement, therefore this kind of adjustment is only qualitative and inaccurate, often to the project after the installation of debugging and running management inconvenient. So in recent years, in more and more of the key parts of the hvac Ding Cheng water system (e.g., water divider, catchment device), have a lot to choose hydraulic balance valve adjusted to the flow distribution of the system.

Hydraulic balance valve has two characteristics: (1) has the good adjustment feature. Good quality hydraulic balance valve has the linear flow characteristic, namely in the valve pressure difference on both ends of a variable, a linear relationship with the traffic and the opening. (2) traffic real-time measurability. Through a dedicated flow measuring instrument can be on the scene for the measured flow through the flow of hydraulic balance Yin. Install the regulator system, according to the area will not be able to very convenient to adjust the design of flow denier o

Because hydraulic balance valve price is higher, some engineering by cone fujian instead of hydraulic balance regulating valve, the valve is also a good adjustment. In at constant pressure difference on both ends of the valve, the flow and a linear relationship with the opening, but can't be measured on the flow.

For the adjustment of the valve - watch the temperature adjustment method is adopted. This adjustment method is used to adjust, each area should be in the running state of equipment: at the end of each region in and out of the water temperature with a thermometer detection, adjust the temperature difference between small areas of the regulator. Such intervals for a period of time regulation, after repeated adjustment of the top a few times can achieve effects.

Equipment at the end of the hydraulic balance for central air conditioning operation stability and operation cost is very important. Because of the central air conditioning terminal equipment used in the water resistance from several dry handkerchief to dozens of kpa. The most common way is through electric two-way valve open and close to adjust each terminal equipment of water supply. When indoor temperature reached set value, close to the temperature of the chicken machine coil electric two-way valve, due to the small water cannot reach the refrigeration (hot) water at the end of the equipment to increase, to adjust each wood end equipment to water, it can make each terminal equipment of the roof can basically achieve refrigeration (hot) abilities. But if the end of the small water resistance equipment accounted for the proportion of larger, by electric valve adjusting method is difficult to solve, to make each terminal equipment can achieve ideal refrigeration (hot) effect, you need to resistance balance processing system.

Hydraulic balance system design good, when choosing a circulating pump is uJ reduce the capacity and head of the circulating water pump, thereby reducing the input power of the circulating water pump. Reduce the operation cost of the system. For a small central air conditioning system and auspicious, selected the size of the circulating water pump efficiency, is one of the important symbol of the levels of test designer to design.

For the processing method of balance resistance many. A Yin, might be solved by changing terminal equipment selection, in the same loop as far as possible choose water resistance at the end of the same equipment. , for example, FP, fan coil units of 6.3 water resistance of 18 for lpa, FP - 12.5 fan coil water resistance of 30 kpa, considered in design house. Technology refrigeration star should choose an IP - 12.5, to choose two FP, fan coil units of 6.3 in each install on the road back to an adjusting valve, so, involving the adjustment valve to reduce significantly the number of adjustment is very convenient. However, if the cold (hot) fan method of pipe load calculation should choose rP '6.3 place is less, is generally not more than 20% of cases, don't need to change, each FP 12.5 to two f7' chicken machine coil 6.3 c in this way is very difficult for the designer, because users are prepared according to the design drawings for procurement bidding. By J: each manufacturer product water resistance is different, even the difference is very big, could not have learned in the design of the selected production and water flow, water resistance, this requires equipment J - home, in the end of the determined to design model changes, this will increase the designer's work.

Another way is by increase the circulating water system, it was adopted by most of the designers. So although meet factory equipment at the end of the water resistance of water demand, but at the end of the water resistance of small equipment for water increased significantly, but also makes the operation of the circulating water pump power increases, the operating cost greatly increased. But for end equipment water resistance are basically identical, this method is very feasible. The system's running cost are also increase * will not officer

: for example, to find a corridor in asked in the office, say, like offices are carried out in accordance with the beam span allocated, little multiplied several relations. In addition to the individual room. Each room number of cold and heat load are multiplied. When the design, equipment at the end of the room

As the fan coil, according to the small room choose fan coil, hot and cold load other rooms according to the multiple relationship increase fan coil number denier. For individual room when choosing fan coil, can undertake choosing according to actual cold and hot load, but when the selected fan coil resistance is bigger, is about to turn it into two, so as not to affect the refrigeration effect. In this way, the system expert wood end to water can basically meet the requirements of the equipment. To father wood will increase the circulation of water. So, the water of the input power is also there will be no large increase.

And - kind of practice, it is sufficient to resistance with resistance balancer for the end of the small devices. Assumptions, lP - 6.3 flow of 580 kr/h, water pK force to 18 kpa; FP \"2.5 water flow for knocking 12 kg/h, water resistance of 40 kpa: in order to guarantee both fan coil can obtain corresponding to water, in this case was to\" y - 63 fan coil mounted - 'in the flow of 580 kg/hR ten, the water resistance of about 12 kpa resistance balancer, such corresponding FP 6.3 water resistance of fan coil units, the same is 40 kpa, each fan coil units will be able to obtain the corresponding circulation of water, which has won't have a fan coil feed denier deviation more or less. Using this method is simple in construction, to ensure the circulation system of hydraulic balance is very practical, is to reduce the abundance of the operating cost, the best way to increase the stability of the system is running.' when adding resistance balancer, 'as it is connected with fan coil of branch pipes, valves and other water resistance is calculated, but their Rl force exists, and water flow rate, the greater the resistance, the greater the so when adding water resistance balancer for water flow at the end of the equipment, resistance distribution is relatively small

; Points. Only in this way can guarantee the end of each equipment to get the corresponding flow, make the system run more stable.