Dehumidifiers are designed for complete air handling and environmental control. It can be installed as stand-alone unit to control humidity in any space requiring humidity control, it can be completely packaged as per the needs and requirement. The single unit can have inbuilt pre-cooling section to cater all fresh air needs, post cooling section for temperature control and moisture control, filtration requirements, as complete solution. The units can be designed with pre/after filters, to handle large airflow requirement and in built condensing units.
Dehumidifier Features –
- Very high moisture removal capacity.
- Leak proof and air tight construction.
- Easy to package.
- Auto/manual selector switch.
- PLC based microprocessor controller.
- Control panel designed for total safety of the equipment.
- All the features of control panel are user friendly.
- Filter at the inlet.
- Multiple option of reactivation heat source – electrical, steam, gas fired direct/indirect, thermic fluid, etc,.
- Combination of different reactivation heat sources available.
- Insulated process and reactivation airflow sectors.
- Special seals to avoid any inter compartmental leakages.
Application- The dehumidification has very wide applications basically in manufacturing processing, product drying, R & D, labs, Packing, cold stores and in almost all the industries.
Dehumidifier is an equipment used to decrease the relative humidity of a room to ensure that the moist space water molecules are reduced for the comfort of the occupants. The relative humidity(RH) shows the percentage of moisture in the air and different room temperature can hold different amount of moisture.
Air that is high in RH will cause sweating and little evaporation and hence discomfort to the occupants. It also caused the growth of mould and mildew which cause health risks to the people in the house.
Besides that, the humid environment is ideal for cockroaches, dust mites and moths to thrive. The dampness also creates an unpleasant smell in the room.
A study shows that the typical RH that is comfortable to the human body is between 30% to 50% RH. Hence, using proper dehumidification equipment is crucial to ensure a healthy and comfortable environment in the homes or offices.
Types of Dehumidifier
- Refrigeration Type
- Spray Type
- Absorption Type
Refrigeration Type is the most common type of humidification system that is used in a typical household. It removes moisture from the air by passing the air over a cooling coil.
This causes the air molecules to lose heat and condense. The water that condensate is then collected on a tray or discharge to the drain outside the house through a drainage hose.
Air conditioner in your house is an example of this type of dehumidification process. It acts as a cooling equipment as well as reducing the humidity of the room. For effective removal of moisture, the dewpoint of the air entering the cooling coil should be higher than the dewpoint of the air leaving it.
Dedicated refrigeration equipment usually consists of a compressor, condenser, evaporator and capillary tube. The fan motor draws the air towards the cooling coil and condenses into a pan or directly into the drain.
The control that is used is called a humidistat. It ON or OFF the compressor and fan based on the condition of the air.
It usually has features to indicate that the pan need to be emptied, the status of the unit, timer control, auto shut-off when pan is full, frost sensor to off the unit when frosting occurred, air filter to ensure only clean air is discharged to the room and variable fan speeds.
The other consideration before buying is to check the noise level of the unit.
A typical dehumidifier
Spray Type consists of a chamber that contains spray nozzles, tank to hold water and a water pump that circulates the water. The incoming air that enters the chamber is forced to be in contact with the water that is sprayed from the nozzles causing heat transfer between the water and the air.
Dehumidification occurs when the temperature of the water is lower than the dew point of the air. This type of dehumidification process is able to absorb odor and cleaner air compared to the refrigeration type.
Absorption Type is used in industrial application and uses sorbent material to absorb the moisture from the air. The material consists of microscopic pores that absorbed the moisture from the air. The liquid-absorbent type uses bromides or chloride brines in a chamber.
The air is then directed to contact the brine solution with a vapor pressure below that of the entering air. As a result, the air that is discharged will be drier than the entering air.
Humidifier
Humidifier is an equipment used to increase the relative humidity of a room to ensure that the dry space has enough moisture for the comfort of the occupants. This happens often during winter when the heater is turned on causing the relative humidity of the air in the house to decrease.
The relative humidity(RH) shows the percentage of moisture in the air and different room temperature can hold different amount of moisture.
Air that is low in RH will tend to absorb water vapor from the surrounding including the people inside the room. This can cause discomfort to the nose, mouth, eyes and throat. It can also cause damage to the furnishing in our homes such as causing the wood to shrink and cracks.
Too much moisture can also cause problem such as mold growing on moist surfaces. On top of that unpleasant smell and the feeling of dampness inside the house also cause discomfort to the occupants.
This situation is bad for our health hence when this happens, you will need to have a dehumidifier to remove the excessive moisture from the air.
A study shows that the typical RH that is comfortable to the human body is between 30% to 50% RH.
Types of Humidifier
The typical equipment used is the evaporative type and consists of a reservoir of water, wick, fan and basic humidistat control. Some higher end unit has heater to reheat the humidified air before being discharged to the room.
Indicators to indicate the ON/OFF status of the unit and the need to top up the water are sometimes included. Find out other types of device that you can purchase from the market.
Spray Type consists of a chamber that contains spray noozles, tank to hold water and a water pump that circulates the water. The incoming air that enters the chamber is forced to be in contact with the water that is sprayed from the nozzles causing heat transfer between the water and the air.
Humidification occurs when the temperature of the water is higher that the dew point of the air.
An Ultrasonic Humidifier
Ultrasonic Type has a piezo transducer that that is vibrated at ultrasonic frequency. This causes the water droplets to breakdown in smaller size and into fine mist which is then discharged to the room by the use of the blower. The diameter of the mist is typically 1 um.
Steam Type is sometimes called vaporizer and it basically boil the water and discharge the steam into the room. It usually consists of a metal reservoir to contain the water, a heater element and a float. The float is used to regulate the water that comes in from the household water supply.
Once power is supplied to the device, the heater will heat up speedily and cause steam to be produced which moisturizes the warm air passing over it. The moist air is then discharged to the room and humidity of the room will increase.
Bypass Type typically consists of an evaporator pad, motor, drain valve, float, water tank, rotating disc and overflow line. The evaporator pad is connected to the rotating disc which enables the pad to dip into the water to absorb the moisture.
Warmer air that comes in passes over the rotating pad causing the moisture to evaporate and hence humidify the air. The moist air is then directed back to the space which need to be humidified.
9001 : 2015