BROAD Absorption Chiller Working Principle

andCentral A/C System

Lecturer-Bob

Absorption chiller Working Principle

Working Process

Elements

High Vacuum Condition

LiBr Solution

Evaporate Cooling

Boiling points are 1265℃ and 100℃

Concentrated LiBr solution has a strong ability to absorb water vapor

Boiling point of water is only 4℃ in 6mmHg

Water evaporation absorbs a lot of heat from chilled W. copper tubes

Circle

Condenser

Evaporator

Heat

Generator

Absorber

StrongSolution

Driving Heat

Hot, HighPressureVapor

Cool, LowPressureVapor

Refrigerant water

Water vapor

WeakSolution

Chilled water

Cooling water

Cooling water heat = Cooling capacity + driving heat

Cooling water

concentrated solution diluted solution refrigerant vapor refrigerant water cooling water chilled water

HTG (690mmHg, 155 )℃

heating source

Evaporator(6mmHg, 4 )℃

LTHE

Absorber(6mmHg, 42 )℃

HTHE

LTG (57mmHg, 90 )℃

Condenser(57mmHg)

38℃

63%, 155℃

42℃

63%, 90℃

41℃ 38℃

57%, 38℃

Absorption Chiller Advantages

long life span & Low maintenance cost Few moving partsLife span is 25 years

Environment friendlyNo FreonTake advantage of waste heatReduce CO2 emission Quiet

Central A/C System

Schematic Diagram

Indoor Terminal

Chiller

Atmosphere

Cooling Tower

Element

Chiller Terminals

Cooling Tower Water Pump

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

Thank you！