Trane SYS-APM001-EN Primary System Components, Chiller evaporator, Flooded evaporator cut-away

Primary System Components

Figure 1. Typical vapor-compression chiller

Compressor

Condenser

Evaporator

Water-cooled chillers are typically installed indoors; air-cooled chillers are typically installed outdoors—either on the roof or next to the building. In cold climates, air-cooled chillers may have a remote evaporator inside the building for freeze protection.

Chiller evaporator

The evaporator section of a water chiller is a shell-and-tube, refrigerant-to- water heat exchanger. Depending on the chiller’s design, either the refrigerant or the water is contained within the tubes.

•In a flooded shell-and-tube evaporator (Figure 2), cool, liquid refrigerant at low pressure enters the distribution system inside the shell and moves uniformly over the tubes, absorbing heat from warmer water that flows through the tubes.

Figure 2. Flooded evaporator cut-away
	Refrigerant
	Vapor
Liquid	Chilled
Refrigerant
	Water
Tube Bundle
	Supply

Chilled	Liquid Level
Water
	Sensor
Return

2 Chiller System Design and Control SYS-APM001-EN