How is chiller calculated?
Divide Q (BTUs per hour) by 12,000 (the number of BTUs in one ton of cooling capacity). This yields the chiller capacity required to handle the process heat load in tons per hour: Example: 240,000/12,000= 20 tons/hr.
How do you size a chiller pipe?
Sizing Chilled Water Pipes Using a Friction Loss Chart
- Fix the Friction Loss of the Chilled Water. The design criteria for the friction loss is not more than 8 ft.
- Limit the Velocity of the Chilled Water.
- Find the Chilled Water Flow Requirement.
- Determine the Chilled Water Pipe Size.
- Optimize the Chilled Water Pipe Size.
How do you calculate chilled water loop time?
Loop Transit Time = 1 Minute 1200 Gallons ∗ 1500 Gallons = 1 min,15 seconds. Under these circumstances, the chiller designed for a small chilled water loop must be able to unload faster than the chiller designed for the larger loop volume to ensure the reliability desired.
What is chiller GPM?
Factories use heat exchangers or chillers to regulate an area’s temperature. A standard formula for finding a chiller’s cooling capacity from its flow rate in gallons per minute determines the cooling rate in British Thermal Units (BTUs) per hour. One refrigeration ton is a cooling rate of 12,000 BTUs per hour.
What is the velocity of water?
Surface water velocity = 20 m 50 s or 0.4 m/s. Average water velocity = 0.4 m/s x 0.85 (correction factor) = 0.34 m/s.
What is this document about chilled water plants?
This document is a design guide for chilled water plants. It identifies the target audience, describes the organization of the material, summarizes what is in each of the chapters, and offers guidance on how to use the document. Find more about Chillers. Mechanical engineers who design chilled water plants are the target audience for the guide.
What is the design Order of operation for central chilled water plants?
System Design Order of Operation ASHRAE’s Fundamentals of Design and Control of Central Chilled-Water Plants suggests starting with coil and tower selections to derive, rather than select system temperatures and flow rates, then proceed to chiller selection.
Who is the target audience for the chilled water plant guide?
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 2 on loads and Chapter 3 on equipment and then refer to this material as necessary.
What is a chiller plant design?
Chillers and chiller plant design provide the designer a very flexible solution to meet the needs of the project. This Guide only covers the basics. The references indicate additional material the designer may wish to review.