1. BROAD Absorption Chiller Working Principle and Central A/C System
Lecturer-Bob

2. Absorption chiller Working Principle
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3. Working Process

4. Elements
Boiling points are 1265℃ and 100℃
Concentrated LiBr solution has a strong ability to absorb water vapor
LiBr Solution
Boiling point of water is only 4℃ in 6mmHg
High Vacuum Condition
Water evaporation absorbs a lot of heat from chilled W. copper tubes
Evaporate Cooling

5. Cooling water heat = Cooling capacity + driving heat
Circle
Cooling water heat = Cooling capacity + driving heat
Cooling water
Hot, High
Pressure
Vapor
Driving Heat
Generator
Condenser
Refrigerant water
Weak
Solution
Strong
Solution
Water vapor
Absorber
Evaporator
Cool, Low
Pressure
Vapor
Heat
Cooling water
Chilled water

6. Condenser LTG HTG heating source HTHE LTHE Evaporator Absorber
(57mmHg)
LTG
(57mmHg, 90℃)
HTG
(690mmHg, 155℃)
heating source
63%, 90℃
63%, 155℃
HTHE
LTHE
38℃
41℃
38℃
42℃
concentrated
solution
diluted solution
refrigerant vapor
refrigerant water
cooling water
chilled water
57%, 38℃
Evaporator
(6mmHg, 4℃)
Absorber
(6mmHg, 42℃)

7. Take advantage of waste heat Reduce CO2 emission Quiet
Absorption Chiller Advantages
Environment friendly
No Freon
Take advantage of waste heat
Reduce CO2 emission
Quiet
long life span &
Low maintenance cost
Few moving parts
Life span is 25 years

8. Central A/C System

9. Schematic Diagram
Indoor
Terminal
Chiller
Atmosphere
Cooling Tower

10. Chiller Cooling Tower Water Pump Terminals Element Elements:
Water pipe (seamless, zinc-plated steel…)
Air duct (zinc-plated steel, glass fiber reinforced plastic…)
Water/ Air valve：regulate/ cut off water/Air flow
Water/ Air filter
Others：
reduce heat loss / prevent surface dewing / avoid scalding

11. Thank you！