How does liquid desiccant work?

Liquid desiccant systems will normally use the hygroscopic properties of a salt solution to dehumidify the air. The solution is exposed to the high relative humidity airstream – typically, outdoor air – and attracts water vapour from the high vapour pressure air to the lower vapour pressure liquid desiccant.

How does a Kathabar system work?

The continuous circulation of Kathene through a heat exchanger extracts energy from the air and transfers it to a coolant. By controlling the flow of coolant through the heat exchanger, the amount of heat extracted by the Alfa Laval Kathabar dehumidifier can be modulated to match the load.

What is liquid desiccant system?

Liquid desiccant systems essentially consist of an absorber for dehumidifying the air, a regenerator for regenerating the solution, and a series of heat exchangers and evaporative coolers for sensible cooling and heating of air and solution.

How does a liquid desiccant dehumidification system remove moisture from the air?

Liquid Desiccant Dehumidification Systems In the conditioning chamber, the concentrated liquid desiccant absorbs moisture from the incoming air and dehumidifies. The diluted lithium chloride flows to a heat exchanger. In the regeneration chamber, moisture from the desiccant transfers to the exhaust air, humidifying it.

Which fluid is used as a liquid desiccant material?

Glycol Selection Glycols are the most commonly used liquid desiccants in the absorption process because they are: Highly hygroscopic (readily absorb and retain water) Stable to heat and chemical decomposition at the temperature and pressures necessary in the process.

What is desiccant used in dehumidifier?

Desiccant Dehumidifiers: Desiccant dehumidification works by passing air through a rotating desiccant wheel to extract moisture from the air. Desiccants such as silica gel naturally absorb moisture – that’s why you’ll find little packets of silica gel in new shoes or electronic goods.

Which are advantages of desiccant air conditioning system?

Mechanical energy is then needed only for reducing the temperature of the air. A desiccant is a substance, either solid or liquid, which absorbs water molecules from air and dehumidifies it….Desiccant Cooling System.

Pros Cons
Improved air quality in interiors High initial cost to setup the system

What is a desiccant cooling system?

Desiccant cooling systems are heat-driven cooling units and they can be used as an alternative to the conventional vapor compression and absorption cooling systems. The operation of a desiccant cooling system is based on the use of a rotary dehumidifier (desiccant wheel) in which air is dehumidified.

How does desiccant cooling work?

The operation of a desiccant cooling system is based on the use of a rotary dehumidifier (desiccant wheel) in which air is dehumidified. The resulting dry air is somewhat cooled in a sensible heat exchanger (rotary regenerator), and then further cooled by an evaporative cooler.

What is desiccant HVAC?

Desiccants are a group of adsorbent materials that have a great affinity for water vapour. Due to this merit, desiccant material can produce hot and dry air which can be used for the drying process as well as in air-conditioning applications to minimize the latent heat load.

How does a liquid desiccant system work?

The liquid desiccant leaves the bottom of the packed bed diluted by the water absorbed from the air, and flows into the regenerator. A heat source such as gas- or oil-fired, waste heat, solar heat in the regenerator heats the weak liquid desiccant solution, which is then sprayed on another packed bed.

What are the different types of liquid desiccants?

Types of Liquid Desiccants. There are two major categories for types of liquid desiccants, each with their own set of chemical properties and functional requirements. These categories include: • Hygroscopic Salts: These are desiccants that have salts, such as lithium chloride, added to a water solution.

Why are liquid desiccants not popular in the supply airstream?

Liquid desiccants are not popular in the supply airstream due to possible health risks such as Legionnaires’ disease and the risk of desiccant droplet carryover causing corrosion in metal ducts. M. Mujahid Rafique, Haitham M. Bahaidarah, in Encyclopedia of Sustainable Technologies, 2017

What is solar – operated liquid desiccant evaporative cooling system?

Schematic of Solar – Operated Liquid Desiccant Evaporative Cooling System The system is connected in a flow arrangement that allow concentrated absorbent solution storage and capability to work in two different automatic modes as may be selected by the user.