S

Moisture Content of the Desiccant

Desorption

Desorption

Cooling

Cooling

Fig. 39-13 Illustration of Rotating Wheel with Equilibrium Diagram. Source: Munters Cargocaire and Mason Grant Company

Rotating wheel systems are becoming increasingly more common as they serve all conditions down to -60°F (-51°C) dewpoint. They are similar in cost to multiple vertical beds and offer similar or superior efficiencies under most loads. They are generally less costly than liquid systems and dry tower systems down to -30°F

(-34°C) dewpoint. When solid adsorbent, rather than absorbent, salts are used in the wheel, maintenance is potentially the lowest of all types of desiccant system. This technology is also becoming popular for use in conjunction with commercial space cooling systems.

Figure 39-14 shows a plan view and Figure 39-15 is a

Fig. 39-14 Plan View of Double Rotating Wheel System. Source: ICC Technologies
Fig. 39-15 Illustration of Double Rotating Wheel System. Source: ICC Technologies

cutaway illustration of a double rotating wheel system, with representative air conditions shown. This system features two wheels. First, the air is dried in the desiccant wheel, then the air temperature is reduced in the second (thermal wheel) before it is delivered to the conditioned space. The second wheel, which is metal, serves as a heat exchanger. Most of the heat from the air leaving the desic-cant wheel is removed to preheat the regeneration airstream, thereby reducing the external heat source requirement. As the wheel gives off heat to the incoming air on the regeneration side, it is cooled and rotates back to the conditioning side to extract heat from the hot dry airstream. As shown, outdoor or building exhaust air entering the regeneration side of the system first passes through an evaporative cooler, which cools the incoming air and raises its RH. The cooler incoming air serves to increase the efficiency of the

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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