Liquid desiccant dehumidification system

Kathabar liquid desiccant dehumidification system s operate on the principle of chemical absorption of water vapor from air. Kathene is non-toxic, will not vaporize, and is not degraded by common airborne contaminants. Small Packaged units combine both the conditioner and regenerator into a single component for easy installation.

The absorbent solution, Kathene, is a desiccant solution composed of lithium chloride salt and water. 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. As the wheel turns, the desiccant passes alternately through one air stream – where the moisture is adsorbed – and then through another air stream, where the desiccant is dried and the moisture expelled. This second process is known as regeneration.

Typically, of the face area would be used for the dehumidification process. Several types of liquid desiccant dehumidifiers using calcium chloride (CaCl2) and other desiccants have been studied. In these integrated designs, the desiccant system works as a pre-conditioner for outside (ventilation) air to remove the latent load.

Other applications of desiccant dehumidification are in ice rinks, hotels and motels, office buildings, full-service and fast food restaurants, medical facilities, and retirement homes. As the desiccant reaches its capacity, it is moved into a warmer air stream (called the reactivation air stream), where it rejects the moisture before it is exposed to the moist air stream again. This often is accomplished by running supply air through a desiccant wheel.

A new technology, close to market introduction, are desiccant cooling systems using a liquid water-lithium chloride solution as sorption material. This type of systems shows several advantages like higher air dehumidification at the same driving temperature range of solid desiccant cooling systems ,. A packing material is a medium for liquid desiccant to interact with the process air stream to extract moisture. Packing materials and their configuration significantly influence the performance of dehumidification unit of the desiccant cooling system. This novel hollow fibre integrated liquid desiccant dehumidification system can be used in an air conditioning system to provide a comfortable indoor environment for hot and humid area. Compared with other conventional liquid desiccant dehumidifier, the polymer hollow fibre has a very small diameter which leads to significantly increased surface area.

The most efficient dehumidification system , when cool and dry air is needed. Simultaneous dehumidification and direct air cooling with a range of equipment sizes from 5CFM to 80CFM. Solid- desiccant systems are similar to liquid - desiccant ones in that they have a conditioner and a regeneration section. Solid- desiccant dehumidification systems feature a rotating wheel constructed of solid- desiccant materials, such as silica gel.

Shop Quality Safe Accessories. Desiccant Dehumidification from Munters. Like solid desiccants, liquid desiccants are specialized chemicals used for drying and purifying air or other gases. They provide a level of vapor pressure lower than water displays at the same temperature, allowing air that moves through this lower pressure solution to become dehumidified. A dehumidification and regeneration system is described.

A liquid desiccant solution may be used to extracts moisture from ambient air in a first location within a dehumidifier with a base. A regenerator in fluid communication with the dehumidifier may extract moisture from the liquid desiccant solution. A survey of liquid desiccant cooling systems is presente along with references to recent work and an assessment of the potential and future research necessary for successful large-scale applications.

To avoid the excessive waste of energy an alternative way to achieve desired moisture reduction is the use of liquid desiccant dehumidification system in which a desiccant material absorbs moisture from the humid air. COP of the two dehumidification methods are presented by Zhang L et al. For liquid desiccant dehumidification , the humidity ratio of regeneration air is the most important influencing factor of COP.

NREL is working with double-AILR to develop aeffect regenerator expands on the that scavenging air regenerator by first boiling the water out of the liquid desiccant solution (250°– 280°F) and reusing the steam by sending it through the scavenging air regenerator. It consists of advanced cellular absorption wheel which sucks humid air in its micro hole in order to exhaust dry air. The purpose of the present study is to investigate experimentally a liquid desiccant dehumidifier with cooling capacity using compressible heat pump system , and develop a correlation of moisture effectiveness to predict the dehumidifier performance.

These two processes of excessive cooling and reheating of process air remarkably increase the air conditioning load. Liquid Dessicant Solar Air-Conditioner - System Overview. Liquid desiccant materials and dehumidifiers – A review. What are the drawbacks of a system such as this. Dehumidifier of an LDAC system is an air - liquid desiccant contacting device responsible for air conditioning.

Most of the times, the dehumidifier used in LDAC systems is an adiabatic device. High LD flow rate necessary in such system s increase parasitic power consumption in these systems. The state of the art for industrial applications is a useful starting point, but typically, its cost, maintenance, and perfor-mance characteristics are not suitable for HVAC applications. A typical industrial application of a liquid - desiccant system is shown in Figure 3. The proposed liquid desiccant membrane-based independent dehumidification system developed by UTRC allows traditional HVAC equipment to handle the cooling load more efficiently by operating it at elevated temperatures. LDAC uses vapor pressure in wet air and adsorption and desorption characteristics of salt solution to adjust moisture content (humidity) of treated air.

The CDQ wheel transfers water vapor, and the cooling coil does all the dehumidification work in the system. The latent (d ehumidification) capacity of the cooling coil increases with out increasing its total cooling capaci ty. The system can achieve a lower supply-air dew point without lowering the coil temperature. In solid desiccant systems, solid desiccant is used.

It is used generally in industries. In liquid desiccant cooling system , liquid desiccant is used. It has two chambers, one is for dehumidification and other is for regeneration of the desiccant.

To make a dehumidifier run in a more stable, controlled and energy-saving way has been a meaningful research direction and goal. For this reason, a novel control system for dehumidifier , liquid desiccant dehumidification system (LDDS) is developed. In fig (a) to (d) and fig it is clear that the velocity of air affect the dehumidification rate. Available from Kathabar Dehumidification Systems Inc. KDS Solar liquid desiccant systems utilize solar hot water for economical dehumidification of outdoor ventilation air that’s typically 30- to 50-percent more energy efficient than dry desiccant systems.

The characteristics of dehumidification column of the liquid desiccant evaporation cooling air conditioning system (LDCS) are introduced in this paper. This system was designed and manufactured for this purpose. Lithium chloride (LiCl), as liquid desiccant , and a packed bed column were used for the dehumidification. The liquid desiccant in our work is Calcium chloride solution. Figure shows a schematic of a solar liquid desiccant air dehumidification system that consists of two loops: the air dehumidification loop and the liquid desiccant regeneration loop.

Figure illustrates such a liquid desiccant dehumidification system. Alfa Laval Kathabar dry desiccant systems use a standard dew- point sensor to control the discharge and return air humidity precisely. Below is a general description of our standard control sequence for each reactivation type.

Custom control sequences can be developed on an application basis. The regenerator is one of the key components in liquid desiccant air-conditioning systems, in which desiccant is concentrated and can be reused in the system. The heat required for regenerating the weak desiccant solution is supplied into the regenerator by either hot air or hot desiccant solution.