Tin tức Cooling systems and insulation thickness

[Aerofoam]

To avoid

• heat gain and reduced efficiency of cooling systems
• condensation of water on surfaces and potential corrosion problems

- pipes in cooling systems should always be insulated.

The insulation thickness of chilled water, refrigerant and brine systems should not be less than indicated below.

System Operation Temperature Pipe Size (inches)
< 1" 1 1/4" - 2" 2 1/2" - 4" 5" - 6" > 8"
(oF) (oC) Insulation Thickness (inches)
Chilled Water 40 - 55 4 - 12 0.5 0.75 1.0 1.0 1.0
Refrigerant < 40 < 4 1.0 1.5 1.5 1.5 1.5
Brine < 40 < 4 1.0 1.5 1.5 1.5 1.5

• 1 inch = 25.4 mm

Insulation of a cold systems should be made with micro-cellular cross-linked polyethylene foam with low water vapor diffusion.

 

[Aerofoam]

Location of Insulation In Cooling System

• Cold Line is insulated to prevent any air leakage into the insulation that can cause condensation of moisture in the pipe.
  
• Suction Line is insulated to prevent the loss of capacity or sweating due to heat gain. Heat gain causes extra load to the condenser hence reducing the overall capacity of the air conditioning system.
  
• Liquid Line does not require any insulation as it is at a higher temperature than the surrounding air. Heat loss to the surrounding air is desirable as it improves the system capacity.
  
• Discharge Line does not require insulation because loss of heat removes load from the condenser. This helps to improve the performance of the compressor.

 

[Aerofoam]

http://energy-models.com/ductwork-design-program

Good information for duct design.