Stop air leakage in the seams of the duct work.
Act as a fire retardant.
Restrict the spread of smoke.
Attenuate transmitted mechanical noise.
Insulate the ductwork.
Spray water through rotating pads to atomize the water.
Spray water through plates to atomize the water.
Have a lower humidification rate than the pan type humidifiers.
Break up the water for humidification into small particles by either a spinning disc or spray nozzle and are place either in the warm air supply duct or in the area to be humidified.
Can be either the power type or the bypass type.
Cooling the spray water to a temperature below the dew point temperature of the entering air.
Heating the spray water to a temperature above the dry bulb temperature of the entering air.
Heating the entering air above its dry bulb temperature.
Using spray water that is above the dewpoint of the entering air, but cooler than the dry bulb temperature.
Cooling the spray water to below the dry bulb temperature of the incoming air, but above its wet-bulb temperature.
The glycol in the system prevents the heat exchanger from freezing if the hot water circulating pump fails.
Flanges or unions and manual shutoff valves must be provided to facilitate removal of the heat exchanger coil.
Hot water temperature should not exceed 100°C.
The temperature controller opens the hot water supply valve when the temperature outside drops to 10°C.
A hot water flow switch prevents the glycol pump from starting until the hot water supply valve is established.
The relative humidity
The specific humidity
Supply water connection should be at the bottom of the coil.
Return water connection should be at the bottom of the coil.
Double serpentine water coil circuit should be used.
Vent should be located at the lowest points of the supply and return lines, and of the coils.
Supply water connection should be at the top of the coil.
A relief damper
A modulating damper
A manual damper
A two-position damper
Parallel blade types only
Opposed blade, parallel blade, and single blade types
Opposed blade types only
Single blade types only
Made of fiberglass
15 and 19°C
16 and 20°C
19 and 24°C
21 and 24°C
17 and 22°C
An R. H. gauge
A dew point analyzer
An aspirating gauge
Failure of the heat source.
Very high circulating water velocity.
Poor air venting of the coil.
Very low circulating water velocity.
Failure of the circulating pump.
Do not require air vents.
Do not use steam-glycol converters as their heat source.
Are not recommended for use in heating and air conditioning systems in the food industry.
Use direct fired boilers as their heat source.
Give reasonable heat transfer efficiency at low glycol velocity.
Bourdon tube to the air duct.
Pressure gauge to the side of a duct, with a sensing tube extending inside of the duct directed toward the airflow.
Manometer to the side of an air duct.
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