A chilled water system is a cooling system in which chilled water is circulated throughout the building or through cooling coils in an hvac system in order to provide space cooling.
Chilled water coil piping.
Single stage parallel steam pressure reducing valve piping diagram.
Single 3 way water coil piping detail with 3 way control valve.
Air is passed over this coil and the heat exchange process takes place.
Chilled water coils and hot water coils typically have identical connection layouts.
Chilled water schematic and condenser water schematics.
Single 2 way chilled water coil piping detail with 2 way control valve.
The principal objectives of chilled water pumping system selection and design are to provide the required cooling capacity to each load to promote the efficient use of.
This can cause.
The heat in the air is absorbed into the coils and then into the water.
The water quantity used in chilled water systems is usually considerably higher than that used for heating because the unit coils work on smaller temperature differentials in the cooling mode than in the heating mode.
The 1 pipe system is poorly suited to chilled water distribution for several reasons.
In this article we l be covering chilled and condenser water schematics to learn how to read them how to identify the main components and symbols as well as real world examples additionally we ll cover the purpose of the main components and different design types.
System flow below chiller min flow 250 gpm variable primary flow at 25 system load two way valves control capacity by varying flow of water in coils per chiller system load 50 tons 176kw 50tons 176 kw primary bypass flow 250 gpm 95 l s 150 gpm 9 5 l s delta t 12 of 6 7 oc 100 gpm 44 ºf 6 3 l s 6 7 ºc 56 ºf 13 3 ºc 150.
System application and material usage copper tubing has a wide variety of sizes to meet the needs of chilled water applications however the sizes used most for chilled water piping range from 1 4 through 12 with economics limiting copper.
I ll leave this post generic so the following should apply to either a chilled water coil or hot water coil there are two main factors to consider when piping up a water coil.
Single line ahu control diagram ahu.
The first thing to remember about coils and counter flow is that chilled water coils are always built to be piped in counter flow.
This water is pumped through chilled water piping throughout the building where it will pass through a coil.
This means that the air flows in the opposite direction as the water.
For this reason water treatment to maintain ph levels is often involved with all chilled water systems.
This allows the return water to temper the warmest entering air getting it closer to its set point prior to leaving the last row where it will see the coldest.
If any fluid is left in an inactive coil while exposed to low ambient temperatures the fluid in the tubes can freeze.
Water coils need to be piped for counter flow with the return being on the entering air side of the coil and the supply being on the leaving air side of the coil.
