Chillers and chilled water system pdf

Systems that employ water chillers are commonly called chilled- water systems. When designing a chilled- wat er system , one of the first issues that must be addressed is to determine which type of water chiller to use. This period discusses the primary differences in chiller types.

Water -cooled chillers typically last longer than air-cooled chillers. Air-cooled chillers may last years while water -cooled chillers may last years or more.

This may be attributable to the fact that water -cooled chillers are installed indoors, and most air-cooled chiller configurations spend their lives outdoors in the elements. Primary-secondary system bypass sizing. HVAC CHILLED WATER DISTRIBUTION SCHEMES 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.

WATER PIPING AND PUMPS Distribution Systems Introduction In this TDP module we will cover major topics associated with chilled water piping, and to a limited extent, hot water piping. We will discuss the three types of piping systems and the four basic piping distribution designs used to supply and return water to HVAC hydronic equipment. A typical chiller uses the process of refrigeration to chill water in a chiller barrel. Chilled Water System Basics.

This water is pumped through chilled water piping throughout the building where it will pass through a coil.

This process is used to produce chilled water for air conditioning and process applications. In addition, unlike RTUs, which circulate cool air through ducts, all chillers circulate chilled water to air-handler units, where fans push air across heat exchanger coils to deliver cooling. They reject the building heat to the ambient with an air-cooled condensing coil. An efficient means of generating hot water is through the heat reclaim capabilities of Carrier’s 19DV and series water -cooled chillers.

Carrier chillers with heat reclaim capabilities can produce chilled water controlled to the necessary temperature while generating hot water as a by-product of the chilled water system. Variable Refrigerant Volume System (VRF System ). However, the VSDs are on the main chilled - water pumps, as shown in. The AHRI test criteria allows an “apples to apples” comparison of different chillers. Bypassed chilled water mixes with return water resulting in lower chilled water return temperature to the plant.

The CSCW System is designed to supply chilled water at 44F to the Control Room Floor Cooling System , Computer Room Floor Cooling System , and the Control Structure HV System. The CSCW System also supplies chilled water to the Unit Reactor Building Emergency Switchgear Room Air Handling System emergency cooling coils. The calculates the savings and cost savings based on the cost of electricity. The chilled water system used to benchmark the energy evaluation tool is located on the.

University of Massachusetts, Amherst campus. The absorption chiller is a machine, which produces chilled water by using heat such as steam, hot water , gas, oil etc. Simplified diagram of a single-stage recirculating fluid chiller , showing direction of flow and heat removal.

Lead Lag Systems Allow for either pump combination to run with any chiller Fixed pump systems Allow only for a specific pump to run with a specific chiller. Design Criteria for Reliable Operation. The chiller system is recirculating gallons per minute of water that is chilled by degrees F and using 24.

With this information you can calculate chiller efficiency in terms of the energy efficiency ratio, or EER, and the coefficient of performance, or COP, for chillers.