Hvac Chilled Water Piping System

The chilled water that exits a chiller is called the chilled water supply chws.

Hvac chilled water piping system.

Jmp 603 diamond hill ct greensboro nc 27406. Each fan coil unit has its own thermostat that regulate the amount of cooling needed. Provide manual blow down valves for strainers in sizes 1 1 4 and larger. Specify strainers in all hot water chilled water steam and condenser water systems.

Normally chilled water is delivered into the piping system at a temperature between 42 f and 46 f. A typical chiller uses the process of refrigeration to chill water in a chiller barrel. Chilled water piping system types typical configuration load valves installed cost pumping cost constant primary flow 3 way lowest highest 3 primary secondary 2 way highest medium variable primary flow 2 way medium lowest. The chilled water loop consists of pipes and pumps that move chilled water around a building.

Chilled water system efficiency chilled water systems in hvac are common in large commercial applications utilizing chillers to chill the water a pumping system to pump the water water and glycol systems are common and chilled water coils inside air handlers or ductwork to exchange heat from the air that is distributed throughout the building for conditioning. Water piping and pumping is a fundamentals topic of hvac design. The chilled water got heated up and returns to the chiller at about 55 f or 13 c. The system s piping consists of four insulated pipes two supply and two return lines.

A chilled water pump chwp pushes chilled water through the chiller and through the chilled water line around the building. This is the water temperature that should be present at the supply connection on the air handler. The chilled water is piped into fan coil units which consist of fins fans with large surface area that absorbed heat from the space through the air heat exchange process. Another set of pipes is dedicated to hot water generally kept between 150 degrees f and 200 degrees f.

Secondary pumps load flow x deltat load equation 4. Provide y type strainers at water supply piping to all chilled water and hot water coils upstream of all components except the last isolation valve. Chilled water system basics 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.

The correct layout se lection and sizing of the piping system and associated hydronic components is required to properly deliver chilled and hot water as required to maintain comfort conditions. Some buildings vary the temperature of chilled water with outdoor temperature change.