Act as a fire retardant.

Restrict the spread of smoke.

Attenuate transmitted mechanical noise.

Insulate the ductwork.

Stop air leakage in the seams of the duct work.

14 kJ/kg

11 kJ/kg

15 kJ/kg

20 kJ/kg

52 kJ/kg

Can be either the power type or the bypass type.

Spray water through plates to atomize the water.

Have a lower humidification rate than the pan type humidifiers.

Spray water through rotating pads to atomize the water.

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.

Cooling the spray water to below the dry bulb temperature of the incoming air, but above its wet-bulb temperature.

Heating the spray water to a temperature above the dry bulb temperature of the entering air.

Cooling the spray water to a temperature below the dew point 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.

20°C

16°C

11.5°C

50°C

40°C

Hot water temperature should not exceed 100°C.

The glycol in the system prevents the heat exchanger from freezing if the hot water circulating pump fails.

A hot water flow switch prevents the glycol pump from starting until the hot water supply valve is established.

The temperature controller opens the hot water supply valve when the temperature outside drops to 10°C.

Flanges or unions and manual shutoff valves must be provided to facilitate removal of the heat exchanger coil.

The specific humidity

The relative humidity

The specific humidity

The enthalpy

Partial pressure

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 bottom of the coil.

Return water connection should be at the bottom of the coil.

Double serpentine water coil circuit should be used.

Supply water connection should be at the top of the coil.

A louver

A modulating damper

A relief damper

A manual damper

A two-position damper

Parallel blade types only

Opposed blade types only

Made of fiberglass

Opposed blade, parallel blade, and single blade types

Single blade types only

17 and 22°C

15 and 19°C

19 and 24°C

21 and 24°C

16 and 20°C

An R. H. gauge

An aspirating gauge

A chronometer

A dew point analyzer

A psychrometer

Failure of the circulating pump.

Very low circulating water velocity.

Failure of the heat source.

Poor air venting of the coil.

Very high circulating water velocity.

Do not use steam-glycol converters as their heat source.

Use direct fired boilers as their heat source.

Are not recommended for use in heating and air conditioning systems in the food industry.

Do not require air vents.

Give reasonable heat transfer efficiency at low glycol velocity.

Manometer to the side of an air duct.

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.