Mechanical and Electrical HVAC: Precautions for Operation of Lithium Bromide Absorption Refrigeration Unit

On July 18, 2024 at 10:50, Beijing Lithium Bromide Absorption Chiller is a refrigeration equipment that uses lithium bromide solution as an absorbent. 

The working principle of lithium bromide unit is based on the absorption and release process of water vapor by lithium bromide solution, 

and refrigeration is achieved through the concentration change of lithium bromide solution.

1. Regular inspection and maintenance:

Regularly inspect and maintain the unit, including checking the lithium bromide solution

Concentration, cleaning of heat exchangers, inspection and replacement of filters, checking the operation of pumps and valves, etc.

2. Monitor solution concentration:

The concentration of lithium bromide solution is crucial for the performance of the unit. 

The concentration of the solution should be regularly monitored and adjusted as needed to maintain optimal cooling performance.

3. Control the temperature of the heat source:

The heat source temperature of lithium bromide absorption refrigeration units should be controlled within the recommended range. 

Excessive temperature may lead to a decrease in unit efficiency, while excessively low temperature may affect the normal operation of the unit.

4. Preventing crystallization:

Improper operation or unsuitable environmental conditions during the operation of lithium bromide units 

may lead to crystallization of lithium bromide solution, affecting the normal operation of the unit.

Lithium bromide absorption refrigeration unit is a refrigeration system driven by thermal energy. 

It needs to follow certain operating and maintenance guidelines during operation to ensure its safe, efficient, and long-term stable operation. 

Here are some precautions when operating lithium bromide absorption refrigeration units:

Lithium bromide solution is prone to crystallization at low temperatures, 

so it is necessary to ensure that the operating temperature of the unit is higher than the crystallization temperature of the solution, 

and special attention should be paid to the supply and return water temperature of the unit's cooling water.

To prevent crystallization of lithium bromide units, the following measures can be taken:

1) Maintain an appropriate concentration of lithium bromide solution: 

The concentration of lithium bromide solution should be kept within an appropriate range, as too low or too high may lead to crystallization. 

Usually, the concentration of lithium bromide solution should be controlled between 50% and 60%.

2) Control the operating temperature of the unit: The operating temperature of the lithium bromide unit should be maintained within an appropriate range, 

as too low or too high a temperature may cause crystallization of the lithium bromide solution. 

Usually, the operating temperature of lithium bromide units should be controlled between 10 ℃ and 40 ℃.

3) Keep the unit clean: Regularly clean the lithium bromide unit to avoid the accumulation of impurities and dirt, 

which may cause lithium bromide solution crystallization.

4) Maintain the sealing of the unit: The sealing of the lithium bromide unit should be good to prevent moisture in the air from entering the unit, 

causing dilution of the lithium bromide solution and increasing the risk of crystallization.

5) Regular inspection and maintenance: Regularly inspect and maintain the lithium bromide unit to promptly identify 

and address any issues that may cause lithium bromide solution crystallization.

6) Using anti crystallization agent: Adding an appropriate amount of anti crystallization agent to lithium bromide solution 

can effectively prevent the crystallization of lithium bromide solution.

7) Adopting appropriate operating mode: Choose the appropriate operating mode according to actual needs to avoid long-term low load operation, 

as low load operation may cause the temperature of lithium bromide solution to be too low, increasing the risk of crystallization.

Through the above measures, crystallization of lithium bromide units can be effectively prevented, ensuring the normal operation and service life of the units. 

In practical operation, corresponding preventive measures should be taken according to the specific situation and operating environment of the unit. 

At the same time, the manufacturer's instructions and maintenance guidelines should be followed to ensure the normal operation of the unit.

5. Avoid air and non condensable gases from entering:

Air and non condensable gases (such as nitrogen, oxygen, etc.) entering the unit will reduce the refrigeration efficiency, 

so it is necessary to ensure good sealing of the unit to avoid the entry of air and non condensable gases.

6. Correct operation:

Operators should be familiar with the operating procedures of the unit to avoid damage or performance degradation caused by misoperation.

7. Emergency situation handling:

Develop emergency response plans, such as heat source failures, cooling water supply interruptions, etc., 

to ensure that measures can be taken quickly in emergency situations and minimize losses.

8. Comply with safety regulations:

During the operation and maintenance process, relevant safety regulations 

and operating procedures should be strictly followed to ensure personnel safety.

9. Record and analyze:

Regularly record the operation data and maintenance status of the unit, analyze the data to identify potential problems, and take preventive measures.

10. Professional operation:

The installation, commissioning, operation, and maintenance of lithium bromide absorption refrigeration units should be carried out 

by professional personnel to ensure the normal operation of the unit and extend its service life.

By following the above precautions, the efficient operation of lithium bromide absorption refrigeration units can be ensured, 

the service life of the units can be extended, and the safety of operators can be ensured. 

In practical operation, corresponding operation and maintenance plans should be developed based on the specific model of the unit 

and the manufacturer's instruction manual, combined with actual operating conditions.