Types of Refrigeration Systems

4 Basic Refrigeration Systems

Direct Expansion (DX)

Air-Cooled condenser

Direct Expansion (DX)

Water-Cooled Condenser

Chilled Water System (CW)

Air-Cooled Condenser

Chilled Water System (CW)

Water-Cooled Condenser

Compressor

Outdoor Air

Condenser

Cooling Coil &

Evaporator (DX)

Air

DX Cooling with

Air-Cooled Condensing

Typical Residential System

Condenser

&

Compressor

Evaporator

(Cooling Coil)

Refrigerant

Piping

Filter Expansion

Device

Cooling Coil&

Evaporator (DX)

Pressure Reducing

Device

Compressor

Outside Air

Liquid Line

Hot Gas Discharge

Cooling

Tower

Suction Line

Condenser Pump

Water-Cooled

Condenser

DX Cooling with

Water-Cooled Condensing

Air

Water-Cooled Condenser

Water flows through tubes

Refrigerant vapor fills shell surrounding tubes

Heat transfers from refrigerant to water

Refrigerant condenses

Liquid Refrigerant

Refrigerant Vapor

Cool Water

Warm Water

Self Contained

Macon, GA

DX Cooling with

Water-Cooled Condensers

Cooling Tower

Sprays

Sump

Propeller Fan

Outdoor Air

Fill

From Condenser95°F [35°C]

To Condenser85°F [29°C]

Evaporator

3-Way Valve

Cooling

Coil

Chilled Water Pump

Chilled Water

Return

Chilled Water

Supply

Pressure Reducing

Device

Compressor

Outside Air

Liquid Line

Hot Gas

Discharge Line

Air-Cooled

Condenser

Suction Line

Chilled Water Cooling with

Air-Cooled Condensing

Shell-and-Tube Evaporator

Refrigerant Vapor

Chilled-Water Return

Chilled-Water Supply

Tube Bundle

Baffles

Liquid / Vapor refrigerant

RTAA

Pueblo, CO

Centrifugal Chiller

Charmes, France

Packaged Air-Cooled Chiller

Clarksville,TN

Pueblo, CO

Chilled Water Cooling with

Air-Cooled Condenser

Chilled Water Cooling with

Water-Cooled Condensing

Evaporator

3-Way Valve

Cooling

Coil

Chilled Water Pump

Chilled Water

Return

Chilled Water

Supply

Pressure Reducing

Device

Compressor

Outside Air

Liquid Line

Hot Gas Discharge

Cooling

Tower

Condenser Pump

Suction Line

Water-Cooled

Condenser

Air

Centrifugal Chiller

LaCrosse, WI

Helical-Rotary (Screw) Chiller

Pueblo, CO

Scroll Chiller

Pueblo, CO

Chilled Water Cooling with

Water-Cooled Condenser

Water Cooled Condenser and Cooling

Towers

17

18

15

16

3 6 8 19 13

4

2 21

7

1 5 14

20

9

12

10

11

What Is Refrigeration?

.005

.010

.015

.020

.025

Hu

mid

ity R

ati

o (

Lb

w/lb

a)

30 40 50 60 70 80 90 100 110

Dry Bulb Temperature (°F)

80%60%

40%

20%

40

50

60

70

80

90

30 comfort zone

75

50

%

1

2

3

4

Refrigerant vapor

Tube bundle

BafflesLiquid–vapor refrigerant

Chilled-water return

Summary of Intro to HVAC

From the Trane Library

More on HVAC Fundamentals Air Conditioning Clinics

Psychrometry

Refrigeration Cycle

Refrigeration Components

Engineered System Clinics

Understanding HVAC Systems

Airside Systems

Refrigeration Systems

Trane Systems Manual

Definitions: A-C

Definitions: D-G

Definitions: H-O

Definitions: P-U

Definitions: V-Z