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.
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.
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.
For this reason water treatment to maintain ph levels is often involved with all chilled water systems.
Single pipe curb assembly detail.
Single stage parallel steam pressure reducing valve piping diagram.
Chilled water schematic and condenser water schematics.
This means that the air flows in the opposite direction as the water.
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.
Air is passed over this coil and the heat exchange process takes place.
Single 3 way water coil piping detail with 3 way control valve.
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.
This water is pumped through chilled water piping throughout the building where it will pass through a coil.
1 coils and counter flow.
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.
The heat in the air is absorbed into the coils and then into the water.
Single 2 way chilled water coil piping detail with 2 way control valve.
This can cause.
Single line ahu control diagram ahu.
For example with counter flow the air flows through rows 1 8 while the water runs through rows 8 1.
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.
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.
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.
