Hvac Chilled Water System Design

Chilled water system basics.

Hvac chilled water system design.

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. 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 water leaves the chilled water evaporator at 45 f or 7 c. Chilled water system basics chilled water systems in residential hvac systems are extremely rare.

This water is pumped through chilled water piping throughout the building where it will pass through a coil. How chilled water air conditioning works. 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. Chw systems also may be used for removing process or other heating loads.

However the purpose of a chiller remains the same. A typical chiller uses the process of refrigeration to chill water in a chiller barrel. 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. 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 systems provide cooling to a building by using chilled water to absorb heat from the building s spaces. 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. To remove heat from water. The principal objectives of chilled water pumping system selection and design are to.

At the heart of the water chilled system a chiller removes heat from water by means of a refrigeration cycle. While designing a chilled water system a myriad of decisions must be made. 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.