Absorption Chiller

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Important notes on choosing types of absorption chillers

Absorption chillers are one of the coolant equipment in air conditioning systems in buildings, which have a much lower power consumption than compact condensers but ...

Important notes on choosing types of absorption chillers

Absorption chillers are one of the coolant equipment in air conditioning systems in buildings, which have a much lower power consumption than compact condensers but require a lot of thermal energy (such as hot water, warm water, steam, direct flame).

This thermal energy causes the water of lithium bromide solution to evaporate in order to create a coolant in the absorption chiller generator. The resulting steam enters the condenser and discharges into the evaporator due to contact with the water coils of the cooling tower.

Due to the vacuum (pressure of 0.01 atm) in the evaporator, evaporated distilled water absorbs the air from the coils of the air-conditioning system (usually water) as a result of its latent heat. The resulting water from this process is absorbed by lithium bromide in the absorber, and this diluted lithium bromide is introduced into the generator by a solution pump. Dry lithium bromide is also returned to the absorber to absorb water and dilute in the generator.

The refrigerant pump in the absorption chiller is responsible for transferring water from the evaporator floor to the fluid-carrying tubes of the air-conditioning system.

Absorption chiller category based on energy requirements

  • Warm water absorption chiller
  • Hot water absorption chiller
  • Direct flame absorption chiller
  • Steam absorption chiller

Absorption Chiller

Main components of absorption chillers

  • Generator
  • Condenser
  • Absorber
  • Operator
  • Solution pump
  • Refrigerant pump
  • Control valves
  • Thermostats and relevant electrical panel

In selecting absorption chillers and ordering the device, the following should be specified

  • Nominal refrigeration capacity and actual refrigeration tonnage (TR)
  • Type of absorption chiller (warm water, steam, hot water, direct flame)

In general, in addition to computing parameters such as geographical conditions (ambient temperature) and outside summer design temperature, altitude, relative air humidity, type of building use (inside design temperature), type of materials used, and the implementation of the facade of the building, the direction of the building relative to the angle of sunshine, the number of floors and the level of building infrastructure, the number of small and large electric equipment inside the building, etc., plant experts consider the amount of cold water required and the confidence coefficient in the chiller function to calculate the required absorption chiller capacity for each project, based on the exact calculation of the total refrigeration load capacity. But if you are willing to use the possibility of rule-of-thumb calculations (phase 1) of the required air chiller for residential and office buildings in climatological conditions such as Tehran, you can consider approximately a nominal capacity of 5 tons of refrigeration per 100 square meters of the building.

Absorption Chillers

In ammonia absorption chillers, the main source of energy to create refrigeration is natural gas.

In lithium bromide absorption chillers (capacities above 30 tons of refrigeration) the main source of energy is hot water, warm water, or steam. (except for direct flame absorption chillers, in which the torch with a proper flame is directly installed on it).

Absorption Chiller

The challenges of choosing a chiller for air conditioning systems in buildings include:

  • The higher initial cost of absorption chillers as compared to compression chillers with similar capacity;

  • The higher dimensions and weight of absorption chillers as compared to those of compression chillers;

  • The cost of maintenance and management of absorption chillers as compared to compression chillers;

  • The need to allocate the volume of circulating water and higher capacity of the cooling tower (more water consumption) and the selecting pumps of tower circulator with a higher capacity, and tubes and joints with larger sizes in absorption chillers as compared to compression chillers;

  • Loss of the relative and economical advantage of using natural gas to supply energy by multiplying the cost of gas consumed in recent years in absorption chillers;

  • Momentary efficiency or lower COP, as well as the lower efficiency of IPLV performance in all models and types of absorption chillers as compared to screw, scroll, and especially centrifugal compression chillers.

Placing an Order and Warranties for the Absorption chiller

  • Offering the best price guarantee for all products, the prices for all Absorption chillers presented by DamaTajhiz are up-to-date and discount-included (see Best Price Guarantee at DamaTajhiz.com).
  • Find the information you need for comparison and purchase, as well as unbeatable prices, for hundreds of models of Absorption chillers with original warranties from reliable manufacturers at DamaTajhiz.com, under the Absorption chiller category.

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