Absorption Working Principle

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Absorption Working Principle

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Absorption Flow Cycle:

Absorption Flow Cycle Return water from the building boils the refrigerant inside the evaporator and changes its form to vapor. The latent energy used is drawn from the building water system sensible energy thus cooling it. Evaporator Chilled Water Return Water Refrigerant Refrigerant Vapor 6mmHg 7 0 C 12 0 C

Absorption Flow Cycle:

Absorption Flow Cycle The refrigerant vapor must be removed to maintain the vacuum so a LiBr solution is sprayed into the absorber. The LiBr bonds with the vapor in the absorption process and forms a dilute LiBr solution. Chilled Water Return Water Refrigerant Refrigerant Vapor Concentrated LiBr Dilute LiBr 6mmHg Absorber 7 0 C 12 0 C Evaporator

Absorption Flow Cycle:

Absorption Flow Cycle The dilute LiBr solution is directed to the generator where heat is applied to drive off the refrigerant vapor. The concentrated or re-generated LiBr solution is returned to the absorber to collect more refrigerant vapor. Chilled Water Return Water Refrigerant Refrigerant Vapor Concentrated LiBr Dilute LiBr Evaporator 6mmHg Generator 690mmHg 160 0 C Heat Input Absorber 7 0 C 12 0 C

Absorption Flow Cycle:

Absorption Flow Cycle A condenser is added to return the refrigerant vapor to its original liquid form before entering the evaporator to begin the cycle again. 6mmHg Generator 690mmHg 160 0 C Heat Input Absorber Evaporator Condenser Chilled Water Return Water Refrigerant Refrigerant Vapor Concentrated LiBr Dilute LiBr 7 0 C 12 0 C

Absorption Flow Cycle:

Absorption Flow Cycle Condenser water flows through the absorber and condenser to remove heat energy from the chiller. The condenser water is sent to a cooling tower where the heat is released to the atmosphere. Condenser 6mmHg 7 0 C 32 0 C Generator 690mmHg 160 0 C Heat Input Absorber Evaporator Chilled Water Return Water Refrigerant Refrigerant Vapor Concentrated LiBr Dilute LiBr Condenser Water 37.5 0 C 12 0 C

Absorption Flow Cycle:

Absorption Flow Cycle On two stage absorbers a second or low stage generator is added which uses the latent heat of the refrigerant vapor to regenerate a second stream of LiBr solution. 6mmHg 7 0 C 32 0 C Low Stage Generator 690mmHg 160 0 C Heat Input Chilled Water Return Water Refrigerant Refrigerant Vapor Concentrated LiBr Dilute LiBr Condenser Water 37.5 0 C 12 0 C High Stage Generator

Absorption Flow Cycle:

Absorption Flow Cycle ‘Intermediary’ heat exchangers between the outlet and inlet of each generator are added to improve efficiency. 7 0 C Heat Input Chilled Water Return Water Refrigerant Refrigerant Vapor Concentrated LiBr Dilute LiBr Condenser Water 37.5 0 C 12 0 C Intermediary Heat Exchangers 32 °C 6mmHg 690mmHg 160 0 C

Absorption Flow Cycle:

Absorption Flow Cycle Direct fired absorbers also include heat exchangers on the HSG to provide heat to the building simultaneously with chilling in a 4-pipe system or separately in a 2-pipe system. 6mmHg 7 0 C 32 0 C 690mmHg 160 0 C Heat Input Chilled Water Return Water Refrigerant Refrigerant Vapor Concentrated LiBr Dilute LiBr Condenser Water Heating Water 37.5 0 C 12 0 C

Direct Fired Absorption Layout:

Direct Fired Absorption Layout Condenser Evaporator Absorber Heat Exchangers High Stage Generator Low Stage Generator Burner Pumps Main Shell

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