Hvac Chilled Water System Design

How chilled water air conditioning works.

Hvac chilled water system design.

Designing chilled water systems typically used for cooling and dehumidifying a building s air chilled water chw systems circulate it throughout a building or campus complex. Chilled water system basics. While designing a chilled water system a myriad of decisions must be made. This water is pumped through chilled water piping throughout the building where it will pass through a coil.

Assume that chilled water is stored at 40ºf and is returned at the standard temp of 55ºf this is a 15ºf t for the refrigeration system thus 1 lb of water stores 15 btu one ton hr of refrigeration is 12 000 btu. The principal objectives of chilled water pumping system selection and design are to. Providing insights for today s hvac system designer volume 47 3 impacts of chilled water system design decisions this engineers newsletter walks through a number of design decisions with discussion and examples to explain how and why those decisions are made. And one ton of refrigeration is 12000 btu.

At the heart of the water chilled system a chiller removes heat from water by means of a refrigeration cycle. To remove heat from water. Chilled water is cooled to between 40 f and 45 f and is circulated through a water coil equipped air handler heat is absorbed from the air as the the air handler blower re. Chilled water systems provide cooling to a building by using chilled water to absorb heat from the building s spaces.

Chw systems also may be used for removing process or other heating loads. In a chilled water air conditioning system water does the chore of absorbing heat from inside and transfering that heat outside to be dispersed into the atmosphere. The chiller is the section of the system where an exchange of heat occurred between the water that goes to the building and the evaporator. This chilled water is then circulated through the entire building by the use of a pump.

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. A typical chiller uses the process of refrigeration to chill water in a chiller barrel. The water leaves the chilled water evaporator at 45 f or 7 c.