Yazaki - Water Fired Chiller/Chiller-Heater

 

 How They Work

Download Product Brochure Here


Water Fired

SINGLE-EFFECT

Chiller or

Chiller-heater

 

 

Yazaki Water-Fired SINGLE-EFFECT chillers have cooling capacities of 5, 10, 20, 30, and 50 tons of refrigeration. Chiller-heaters have cooling capacities of 10, 20, and 30 tons of refrigeration. Both produce chilled water for cooling and chiller-heaters also provide hot water for heating in comfort air conditioning applications. The absorption cycle is energized by a heat medium (hot water) at 158°F to 203°F from an industrial process, cogeneration system, solar energy or other heat source and the condenser is water cooled through a cooling tower.


Absorption Principle

 

The Yazaki absorption chiller or chiller-heater uses a solution of lithium bromide and water, under a vacuum, as the working fluid.  Water is the refrigerant and lithium bromide, a nontoxic salt, is the absorbent.  Refrigerant, liberated by heat from the solution, produces a refrigerating effect in the evaporator when cooling water is circulated through the condenser and absorber.


Cooling Cycle

 

 

Generator

When the heat medium inlet temperature exceeds 154.4°F, the solution pump forces dilute lithium bromide solution into the generator.  The solution boils vigorously under a vacuum and droplets of concentrated solution are carried with refrigerant vapor to the primary separator.  After separation, refrigerant vapor flows to the condenser and concentrated solution is precooled in the heat exchanger before flowing to the absorber.

 

 

Condenser

In the condenser, refrigerant vapor is condensed on the surface of the cooling coil and latent heat, removed by the cooling water, is rejected to a cooling tower.  Refrigerant liquid accumulates in the condenser and then passes through an orifice into the evaporator.

 

Evaporator

In the evaporator, the refrigerant liquid is exposed to a substantially deeper vacuum than in the condenser due to the influence of the absorber.  As refrigerant liquid flows over the surface of the evaporator coil it boils and removes heat, equivalent to the latent heat of the refrigerant, from the chilled water circuit.  The recirculating chilled water is cooled to 44.6°F and the refrigerant vapor is attracted to the absorber.

 

Absorber

A deep vacuum in the absorber is maintained by the affinity of the concentrated solution from the generator with the refrigerant vapor formed in the evaporator.  The refrigerant vapor is absorbed by the concentrated lithium bromide solution flowing across the surface of the absorber coil.  Heat of condensation and dilution are removed by the cooling water and rejected to a cooling tower.  The resulting dilute solution is preheated in a heat exchanger before returning to the generator where the cycle is repeated.

 

Heating Cycle

 

 

Generator

When the heat medium inlet temperature exceeds 154.4°F, the solution pump forces dilute lithium bromide solution into the generator.  The solution boils vigorously under a vacuum to generate refrigerant vapor and droplets of concentrated solution.  Since the changeover valve is open during heating operation, the mixture of refrigerant vapor and concentrated solution flows directly into the evaporator. Some refrigerant vapor flows through the condenser before reaching the evaporator.

 

 

Evaporator

Hot refrigerant vapor condenses on the surface of the evaporator coil and heat, equivalent to the latent heat of the refrigerant, is transferred to the hot water circuit.  The recirculating water is heated to 131°F.  Refrigerant liquid mixes with concentrated lithium bromide solution and the resulting dilute solution returns to the generator where the cycle is repeated.

 


 

Back to Top
 

Next
 

  Yazaki Energy Systems, Inc.

701 E. Plano Parkway, Suite 305
Plano, TX 75074-6700
Phone: (469) 229-5443
Fax: (469) 229-5448

 

 
 Copyright 2013 Yazaki Energy Systems, Inc.