Chilled water system design pdf

Mechanical engineers who design chilled water plants are the target audience for the guide. All of the material in the guide is relevant to this group, although experienced engineers can briefly review Chapter on loads and Chapter on equipment and then refer to this material as necessary. The range of allowable elevation of chilled water piping in the building is a maximum of 5feet above sea level and a minimum of 3feet above sea level. 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. Susanna is an applications engineer at Trane with over years of experience with chilled-water systems and HVAC building load and energy analysis.

Her primary responsibility is to aid system design engineers and Trane personnel in the proper design and application of HVAC systems.

Water chillers are used in a variety of air conditioning and process cooling applications. They cool water that is subsequently transported by pumps and pipes. The water passes through the tubes of coils to cool air in an air conditioning system , or it can provide co oling for a manufacturing or industrial process. System designers may get the most use from this manual by familiarizing themselves with chilled-water-system basics and understanding the benefits of various options. Thereafter, when a specific job will benefit from these advantages, consult appropriate sections of the manual in detail.

Pipe Systems A 1-pipe water distribution system is a system that has a one main pipe looping around the building and then returning. This level of in most systems. 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.

Chilled water systems also use the basic refrigeration cycle but instead of cooling the air directly, chilled water systems cool water which in turn cools the air. The condenser side of a chilled water system can be either air-cooled or water -cooled. Air-cooled chillers must be located outdoors in order for the condenser to reject heat. As a result, a new chilled water system design has become available.

Like the primary-secondary system the single loop design has two-way valves in air handlers. When the load on the coil is zero, the valve is returning “unused” chilled water at essentially supply temperature. Cold return water “unloads” the chillers, causing them to operate inefficiently. The chilled water supply temperature must be cold enough to dehumidify the air, but not too cold that the chiller freezes.

The typical chilled water temperatures are shown below. C If the chilled water system is a glycol mixture, then the lowest temperature may be different than what is shown above. Technical Development Programs (TDP) are modules of technical training on HVAC theory, system design , equipment selection and application topics. They are targeted at engineers and designers who wish to develop their knowledge in this field to effectively design , specify, sell or apply HVAC equipment in commercial applications. BASIC HYDRONIC SYSTEM DESIGN Generation Equipment Boilers, Chillers, Cooling.

Primary and secondary systems Notice there is a common header between the flow and return lines. Chilled Water System Basics - Chilled water systems in residential HVAC systems are extremely rare. A typical chiller uses the process of refrigeration to chill water in a chiller barrel.