Cast iron Balancing Valves
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Thong tin chi tiet Cast iron Balancing Valves Mival – Khuong 0908.202.709
What Is Balanced System?
A cooling or heating water distribution system is in balance when the flow in the whole system (through the component terminal lines, distributing lines and main distributing lines) corresponds to the flow rates that were specified for the design of the system. If the correct balancing of the system is not established, this will result in unequal distribution of the flow so that there will be a surplus effect in some of the terminals, whereas the effect will be inadequate in others. The result of this will be that the wanted heating/chilling will not be ensured in all parts of the installation. In practice it is not possible to make a correctly balanced system by manipulation of the piping or alteration of the pipe dimensions only. Only a correct set of balancing valves can ensure the correct distribution of the flow in the system.
An automatic balancing valve uses the latest flow technology to ensure that the design flow rate is achieved at all times irrespective of any pressure changes within the system Cast iron Balancing Valves
Typical Design Flow Rates – Cast iron Balancing Valves Mival
In a variable primary chilled water system, the Design flow rate is determined by the water flow velocity in the tube of the coils.
- At Typical Conditions, 6-7 FPS
- Maximum 12 FPS
- Minimum 1.5 FPS ( Based On A Reynolds # Of 7500)
- Minimum flow is typically 50% or less of the design flow.[1]
- Chiller manufacturers typically limit the tube velocities in the range from 5.0 feet per second to 10.0 feet per second.[2]
Constant Flow – Cast iron Balancing Valves Mival
Until recently,[when?] constant-flow systems set the standard in HVAC system design. They allow standard designs to be applied to numerous different projects, typically incorporating fixed-speed pumps sized to match the maximum load of the system.These systems are balanced using a proportional method with manually set, fixed-orifice, double-regulating balancing valves installed to account for and reduce the impact of pressure changes in the system.In such constant-flow systems, the capital costs are, indeed, low. However, the energy usage is high, since these systems and the pumps driving them rarely operate at the 100% load they were designed for, calling into question the effectiveness of balancing this type of system in the first place. Further, the process of proportional balancing to commission the system is long, painstaking and expensive.[citation needed]
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