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.

Hvac chilled water system design.

A typical chiller uses the process of refrigeration to chill water in a chiller barrel. 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. However the purpose of a chiller remains the same. How chilled water air conditioning works.

And one ton of refrigeration is 12000 btu. 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. This class is intended for hvac consulting engineers energy engineers facility managers property managers involved in the selection design operation or maintenance of commercial buildings using an applied chilled water system. 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.

To remove heat from water. Chilled water system basics chilled water systems in residential hvac systems are extremely rare. Chw systems also may be used for removing process or other heating loads. Chilled water systems provide cooling to a building by using chilled water to absorb heat from the building s spaces.

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. This chilled water is then circulated through the entire building by the use of a pump. Chilled water system basics. 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. While designing a chilled water system a myriad of decisions must be made. The water leaves the chilled water evaporator at 45 f or 7 c.