What is Decoupler in chilled water system?
The decoupler flow rate is an indicator of excess chiller capacity and can be used to disable active chillers not required to meet the current demand. (However, flow rate is not a good indicator of when to enable additional chillers.)
What is Decoupler valve?
The Pallet Decoupler Valve allows hydraulically clamped tooling fixtures to maintain pressure when disconnected from their power source. The Pallet Decoupler Valve adds a level of security to fixtures that must be disconnected from a power source while being moved.
What is the function of Decoupler?
Under normal circumstances, the decoupler functions to isolate or block the flow of DC current (cathodic protection) to other equipment or grounding material, thereby eliminating any negative influence on your CP system caused by neighboring equipment or grounding materials.
What is a decoupler?
(diːˈkʌplə) noun. a person or device that disconnects parts that are joined.
What is a hydraulic Decoupler?
The hydraulic separator, or decoupler, is a simple device that permits. co-mingling of the primary and secondary circuits while also eliminating problems.
What is primary and secondary pump in HVAC?
The primary loop uses a constant speed pump to circulate the working fluid (water). The secondary loop uses a variable speed pump to manipulate the flow of the fluid such that the cooling coil demand is satisfied. The above mentioned pumps are considered as a primary/secondary pumping pair.
How does a chilled water pump work?
The chilled water pump circulates return chilled water from the air handling units & fan coil units back to the chiller. The chiller then cools the chilled water and the chilled water is then supplied back to the air handling units and fan coil units. The chilled water pump circulates chilled water through the system.
What is solid state Decoupler?
The SSD functions as a DC isolation and AC coupling device (a “decoupler”), preventing the flow of CP current up to a pre- determined voltage threshold, while passing any induced AC current.
What is primary and secondary chilled water system?
A primary-secondary system consists of two hydronic loops connected by a de-coupler. The primary loop utilizes constant volume pumps to maintain constant flow through the chillers while the secondary loop utilizes variable volume pumps to pull the chilled water from the primary loop and distribute it to the system.
What is a solid state Decoupler?
Solid-state decouplers are an essential component of any cathodic protection system. They allow simultaneous DC isolation and AC grounding. That allows pipeline operators to improve the performance of their CP system while remaining grounded for safety.
What are low loss headers?
A low loss header usually has a drain at the bottom of it. Hot water passes through the header at a lower pressure than it would pass through the rest of the system. This reduction in pressure and speed allows time for any dirt and debris in the system to sink to the bottom of the header.
What is decoupler in AC?
Decoupler: Common Chilled Water Pipe between Primary and Secondary loops. after attaining the required temperature bypass is activated (bypass= thermostat in refrigerators) in fcus >the bypass is between the supply and return water to AHU .
What is a decouple loop in a chilled water system?
http://systemcontroltech.com/ The purpose of a decouple loop in a chilled water system is to help the programming decide to stage up another chiller or stage down the chiller. This type of control is generally found on systems with multiple chillers.
Why is there no flow in the decoupler pipe?
As it pulls more and more water out of the primary loop, the flow through the decoupler pipe is less and less. It will reach a point where the building return is equal to the primary pump GPM, and there will be no flow in the decoupler pipe.
What is decoupler bridge in piping?
Decoupler (Decoupler bridge) used for the piping design between the primary and secondary loops, the purpose of it is to have a minimum pressure drop, thus any change in flow rate in one loop will not affect the flow rate at the other.