Portable Dehumidifier 130 liter SD-130L In bangladesh

130L Dehumidifier Moisture content is, simply, how much water is in a product. It influences the physical properties of a substance, including weight, density, viscosity, conductivity, and others. It is generally determined by weight loss upon drying. There are many methods for determination of moisture content. The primary methods used are loss on drying and Karl Fischer titration. There are many methods for determination of moisture content. The primary methods used are loss on drying and Karl Fischer titration.

A dehumidifier is an electrical appliance that reduces and maintains the level of humidity in the air, usually for health or comfort reasons, or to eliminate musty odor and to prevent the growth of mildew by extracting water from the air. It can be used for household, commercial, or industrial applications. Large dehumidifiers are used in commercial buildings such as indoor ice rinks and swimming pools, as well as manufacturing plants or storage warehouses. Portable Dehumidifier 130

• Overview

Dehumidifiers extract water from air that passes through the unit. There are two types of dehumidifiers – condensate dehumidifiers and desiccant dehumidifiers. Condensate dehumidifiers use a refrigerator to collect water known as condensate, which is normally greywater but may at times be reused for industrial purposes. Some manufacturers offer reverse osmosis filters to turn the condensate into potable water. Some designs, such as the ionic membrane dehumidifier, dispose off water as a vapor

• History

The first dehumidifier was created by American inventor Willis Carrier in 1902 to dehumidify a Brooklyn printing plant. Carrier cited the discovery as later motivating further discoveries in air conditioning

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• Refrigeration (electric)

Electric refrigeration dehumidifiers are the most common type of dehumidifiers. They work by drawing moist air over a refrigerated evaporator with a fan. There are 3 main types of evaporators. They are coiled tubes, fin and tube, and microchannel technology.

The cold evaporator coil of the refrigeration device condenses the water, which is removed, and then the air is reheated by the condenser coil. The now dehumidified, re-warmed air is released into the room. This process works most effectively at higher ambient temperatures with a high dew point temperature. In cold climates, the process is less effective. The highest efficiency is reached

above 20 °C (68 °F) and 45% relative humidity. This relative humidity value is higher if the temperature of the air is lower.

• Conventional air conditioners

A conventional air conditioner is very similar to an electric dehumidifier and inherently acts as a dehumidifier when chilling the air. In an air conditioner, however, the air passes over the cold evaporator coils and then directly into the room. It is not re-heated by passing over the condenser, as in a refrigeration dehumidifier. Instead, the refrigerant is pumped by the compressor to a

condenser which is located outside the room to be conditioned, and the heat is then released to the outside air. Conventional air conditioners use additional energy exhausting air outside, and new air can have more moisture than the room needs, such as a pool room that already holds a high amount of moisture in the air.

The water that condenses on the evaporator in an air conditioner is usually routed to remove extracted water from the conditioned space. Newer high-efficiency window units use the condensed water to help cool the condenser coil by evaporating the water into the outdoor air, while older units simply allowed the water to drip outside

Spray dehumidifiers

When water is chilled below the atmospheric dew point, atmospheric water will condense onto it faster than water evaporates from it. Spray dehumidifiers mix sprays of chilled water and air to capture atmospheric moisture. They also capture pollutants and contaminants like pollen, for which purpose they are sometimes called “air washers

Makeshift dehumidifiers

Because window air conditioner units have condensers and expansion units, some of them can be used as makeshift dehumidifiers by sending their heat exhaust back into the same room as the cooled air, instead of the outside environment. If the condensate from the cooling coils is drained away from the room as it drips off the cooling coils, the result will be room air that is drier but

slightly warmer.

Ice buildup

Under certain conditions of temperature and humidity, ice can form on a refrigeration dehumidifier’s evaporator coils. The ice buildup can impede airflow and eventually form a solid block encasing the coils. This buildup prevents the dehumidifier from operating effectively, and can cause water damage if condensed water drips off the accumulated ice and not into the collection tray.

In extreme cases, the ice can deform or distort mechanical elements, causing permanent damage.

Better-quality dehumidifiers may have a frost or ice sensor. These will turn off the machine and allow the ice-covered coils to warm and defrost. Once defrosted, the machine will automatically restart. Most ice sensors are simple thermal switches and do not directly sense the presence or absence of ice buildup. An alternative design senses the impeded air flow and shuts off the cooling

coils in a similar manner.

Thermoelectric dehumidifiers

Thermoelectric dehumidifiers use a Peltier heat pump to cool a surface and condense water vapor from the air. The design is simpler and has the benefit of being quieter compared to a dehumidifier with a mechanical compressor. However, because of its relatively poor Coefficient of Performance, this design is mainly used for small dehumidifiers. Ice buildup may be a problem,

similar to problems with refrigeration dehumidifiers.

Absorption/desiccant dehumidification

This process uses a special humidity-absorbing material called a desiccant, which is exposed to the air to be conditioned. The humidity-saturated material is then moved to a different location, where it is “recharged” to drive off the humidity, typically by heating it. The desiccant can be mounted on a belt or other means of transporting it during a cycle of operation.

Dehumidifiers that work according to the absorption principle are especially suited for high humidity levels at low temperatures. They are often used in various sectors in the industry so that humidity levels below 35% can be achieved.

Because of the lack of compressor parts desiccant dehumidifiers are often lighter and quieter than compressor dehumidifiers. Desiccant dehumidifiers can also operate at lower temperatures than compressor dehumidifiers as the unit does not rely on cooling coils for which the moisture condensing efficiency decreases at lower temperatures.

Ionic membrane dehumidification

The anionic membrane can be used to move humidity into or out of a sealed enclosure, operating at a molecular level without involving visible liquid water.

The solid polymer electrolyte (SPE) membrane is a low power, steady-state dehumidifier for enclosed areas where maintenance is difficult. The electrolytic process delivers dehumidifying

capacities up to 0.2 grams/day from a 0.2 m³ (7 cu ft) space to 58 grams/day from an 8m³ (280 cu ft). SPE systems generally do not have high dehydration capacities, but because the water vapor is removed through electrolysis, the process is maintenance-free. The process also requires very little electrical energy to operate, using no moving parts, making the ionic membranes silent in

operation and very reliable over long periods. SPE dehumidifiers are typically used to protect sensitive electrical components, medical equipment, museum specimens, or scientific apparatus from humid environments.

Disposal

Products using condensation technology has traditionally been using a cold surface where humidity in warm air is condensed. Today the warm condensation technology based on the concept of over-saturated steam inside a closed environment makes it possible to dehumidify air at sub-zero temperatures. This is a very energy-efficient technology and equally efficient in all temperatures.

Potability

Generally, dehumidifier water is considered a rather clean kind of greywater: not suitable for drinking, but acceptable for watering plants, though not garden vegetables The health concerns are The water may contain trace metals from solder and other metallic parts, most significantly lead (which is quite dangerous), but also copper, aluminum, or zinc. The trace metals may pose a

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