Lack of chilled water flow in closed loop chiller systems remains a common complaint among users.
Closed loop chilled water system pressure.
This would seem to be a simple concept but it is surprising how often a lack of attention to the basics can cause all kinds of problems.
However when leaks occur it can be costly and difficult to maintain the treatment levels necessary for corrosion and deposit control.
Routine testing of conductivity ph or alkalinity and inhibitor level is used to determine if there has been any.
Closed heating and cooling water systems typically require little makeup water and minimal chemical additions following the initial system charge.
Examples of closed loop systems include hot oil circuits cooling chilled water systems hot water heating and air conditioning systems.
If piped correctly closed loop chiller systems provide adequate chiller water flow at the optimum curve of the circulating pump without problems.
Most modern hydronic heating and or cooling systems are closed systems that must be maintained at some minimum pressure.
Closed systems must be pressurized to satisfy three requirements.
The closed loop system should be pressurized at a specific pressure to run normally i have makeup water pumps to initially fill the system and then maintain the pressure in the system in case of leaks or drain the pumps should refill the system and pressurize it again automatically if possible where should i make the connection for the makeup water in the chilled water system how.
In the penthouse he has a 50 psi discharge and 20 psi suction pressure on floors 15 16 17 his only scope of work he has 150 psi at each of the three air handlers.
The problem usually traces back to improper system piping.
A friend just called me about a closed loop chilled water system he is having trouble with.
Other closed loop cooling systems can include chilled water systems for air chillers used at the air inlet to the gas turbines at a combined cycle power plant and the chemistry sample panel.