Dynamic balance valves in HVAC engineering (a)

With the rapid development of China's national economy, cities, the increasing scale of building construction, indoor environment of increasing demands. In particular, the construction of the gold zone in the commercial construction, how to increase the effective rate of the business areas: air-conditioning system to ensure the use and operation of the resulting increase in energy consumption does not? Is the HVAC professional and construction issues of common concern to developers.



First, the design of water HVAC system status



Whether it is air-conditioning or heating project, as a result of conditions and can not be completely the same way systems. Way systems vary in the actual design of the system in order to ensure the most disadvantaged end of the funding loop with pressure head, all other air-conditioning heating equipment owned by the end of the first pressure condition is often greater than the needs of the design value, especially in large-scale function of the complexity of the construction of the project, different long-range pipeline, terminal equipment and air-conditioning resistance to vary a great difference between the end of start and stop system, the location of cold and heat source in close proximity to the capital with more than excessive pressure head, often deviated from the design of a state of flux distribution , resulting in an imbalance of its hydraulic system. Deviation will produce flow proximal air-conditioning cold and heat source or heating does not heat太热phenomenon. Not only can not guarantee that the use of the function, also resulted in a waste of energy.



Second, the approach to resolve the imbalance of water



1, plus cutting plate



Heat or air conditioning in the entrance of the cold-source loop around part of the tube sections to increase expenditure plate. This solution is a prerequisite for hydraulic disorders: an accurate calculation of water system resistance, heat or air conditioning can not be the end of the flow change. Therefore, in the end will result in changes in the flow of hydraulic imbalance and a waste of energy.



2, the installation of manual control valve



Of large air conditioning systems, manually adjust process control valve complex, manually adjust the front-end valves, back-flow will be affected. Back-end to adjust the flow of traffic will change the front end. Therefore time-consuming and laborious adjustment; for complex systems, require adjustment valve experienced engineers. Once the system pressure and load changes or still need to re-adjust the hydraulic system.



3, the installation of dynamic flow balance valve



Heat or air-conditioning end of the entrance of the design flow are identified, based on flow and pressure valves Department of dynamic changes in the scope of selected balance valve, the valve can be installed using a good setting. Department as long as the valves in the valve of the pressure changes in the scope of the design pressure, without any artificial adjustment.



Third, the characteristics of dynamic balance valve



1, the working principle of dynamic balance valve:



By changing the balance valve spool of the flow around the valve area to adapt to changes, so as to achieve the purpose of traffic control. Dynamic balance valve is a local resistance to change in expenditure components, for incompressible fluid flow equation is simplified as follows:



Q = KA (△ P)



Where: Q - flow through the balance valve;



K - the valve opening the flow coefficient;



A - flow area of spool



△ P - pressure valves Import and Export



Since the opening of the valve under the premise of the same, K value of the change can be neglected, so the flow valve should be controlled to maintain a constant A (△ P) unchanged. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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