Factories, warehouses, healthcare facilities, commercial buildings, and office spaces generate unwanted heat that must be removed from the process, equipment, or occupants inside. Chillers may be used to remove this heat by transferring it to the atmosphere either by air or water cooled chillers. At the heart of the chilling process is the evaporation of a liquid refrigerant into a gas. Two basic types of chillers include vapor compression and absorption. In this blog, we will focus on the vapor compression chiller.
Vapor Compression Chiller System
Vapor compression chillers use a mechanical compressor powered by electricity, steam, or gas turbines. They produce cooling using the “vapor compression” refrigeration cycle (similar to a home air conditioning unit). Figure 1 illustrates a typical vapor compression chiller system for building air conditioning.
Figure 1: Vapor Compression Chiller System
The vapor compression chiller system steps, as numbered in Figure 1, are described below.
How a Vapor Compression Chiller Cools
Next let’s look at how a typical chiller used with a building HVAC system
operates. Vapor compression chillers have four basic components:
Figure 2: Vapor Compression Refrigeration
The refrigeration process starts as follows, as shown in Figure 2:
The heart of a vapor compression chiller is the mechanical compressor. Compression chillers can be classified based on the type of compressor used, with positive displacement (reciprocating, scroll, and screw) and centrifugal compressors being the main types.
Reciprocating compressors are characterized by what looks like an “engine” associated with the chiller. This engine is the reciprocating piston-type compressor. Centrifugal compressors are typically used in larger chillers because they can handle larger volumes of refrigerant. Centrifugal chillers are characterized by what looks like a large fan that creates a pressure difference from one side of the compressor to the other.
Chem-Aqua Can Help Keep Your Chiller Cool
No matter which type of chiller you use, effective water treatment is an essential part of a cooling water system’s preventative maintenance program. A customized water treatment program from Chem-Aqua does more than protect your system from the ravages of corrosion, deposits, and microbiological growth. It also helps maximize the life, efficiency, reliability, and safety of your cooling water system while keeping energy, water, and maintenance costs to a minimum. To find out how we can help, contact us at https://www.chemaqua.com/en-us/Contact-Us.
Written by: James McDonald
Gem Orion Machinery
8/28/2020 4:21 AM
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