Dehumidification >> How Does A Dehumidifier Work

Principal Findings and Significance This experimental study focuses on parametric trends in the freshwater-production rate, i.e., how the production rate of freshwater is affected by changes in the various thermal/fluid parameters. We are particularly interested in how the freshwater-production rate is affected by the heat input to the How Does A Dehumidifier Work saltwater held in the storage tank. 

Experimental results from this study are summarized in Figure 3 which lots the fresh water production rate, How Does A Dehumidifier Work in gallons per hour (GPH), as a function of the heater power (in kW) input to the saltwater. Three heating-power input levels are tested: 2.65, 3.60, and 4.45 kW. Flow rate of the heated saltwater is fixed at 2 gallons per minute (GPM) and flow rate of the cooled freshwater is fixed at 1.5 GPM. 

Temperatures of the saltwater at the inlet of the evaporator are 51°C for 2.65 kW of heater power, How Does A Dehumidifier Work 55.5°C for 3.6 kW, and 59°C for 4.45 kW. Temperatures of the cooled freshwater at the inlet of the condenser range from 17.5°C to 19.5°C, increasing only slightly with increased heater power. Air velocity has a fixed value of about 6.2 m/s.  

3. Experimental freshwater-production rate vs. heater-power input to the saltwater. Figure 3 shows How Does A Dehumidifier Work that the freshwater-production rate increases with increasing heater-power input. This implies that increased solar-radiation capture will lead to higher freshwater production rates in actual solar-energy-driven desalination systems. 

Figure 3 further reveals that the relationship between the freshwater-production rate How Does A Dehumidifier Work and the heater-power input is fairly linear. To explore the freshwater-production rate per unit of power input the ratio of the freshwater-production rate to the heater-power input is plotted in Figure 4 as a function of the heater-power input. 

The ratio is fairly constant with an average value of 0.348 GPH/kW, which means that for 1 kW of heating-power input the present experimental system is able to produce 0.348 gallon of freshwater per 1 hour. This How Does A Dehumidifier Work production rate to power value is only taking into consideration the heating power. The necessary cooling power is not factored into the calculation. 

In addition, the thermal energy removed during the condensation process was not recovered in the study. It is expected that the freshwater-production rate per unit input heating power will increase if energy recovery technologies are applied. Comparing this average production rate to other conventional electrical devices such as water distillers, How Does A Dehumidifier Work we found congruency between the device and the HDH system. 

A typical 600 W electric distiller can produce 1 gallon of water in 5 hours. This translates to 0.333 GPH/kW which is roughly equal to what the HDH system can produce. From an energy standpoint this is expected. However, How Does A Dehumidifier Work the advantage of the HDH system is that it can be operated from lower grade energy and industrial waste heat. 

The Oahu solar map is examined to explore the estimated freshwater-production rates How Does A Dehumidifier Work if the present lab-scale experimental system is operated outdoors and driven by solar energy. The result is shown in Figure 5. The Ewa plain on the west side of Oahu, Hawaii, is selected as the site of study due to its potential freshwater shortage and expected population growth. 

Figure 5 shows that with 1 square meter of land on the Ewa plain used for solar-energy How Does A Dehumidifier Work collection the present experimental system is able to produce 2.02 gallons of freshwater per day. Figure 5. Oahu’s solar map illustrates the estimated freshwater-production rate and the Ewa plain study area.

The present experimental study also reveals that while the freshwater-production rate decreases How Does A Dehumidifier Work slightly with decreasing air velocity it is not sensitive to variations in the saltwater and freshwater flow rates. Doubling the saltwater or freshwater flow rate does not create a substantial change in freshwater production. 

The experimental results also show very low water production sensitivity toward air flow rate. The difference in water production between different air flow rates is very miniscule and inclusive. After considering variation How Does A Dehumidifier Work and system error, these results are inclusive but demonstrate the weak correlation between the water production and air flow rate. 

In summary, a HDH seawater desalination lab-scale experimental system is designed, constructed, How Does A Dehumidifier Work and tested to prove the concept of the desalination technique. The testing system is able to deliver stable and highly repeatable freshwater production for long-term operations. Results from testing runs indicate that among the many operating parameters the system performance is most affected by the heat input to the saltwater. 

The knowledge we gained through this How Does A Dehumidifier Work project can readily be applied towards developing industrial-scale HDH desalination systems. Approval is requested to enter into a sole source contract with the contractor indicated below to obtain construction services for the "Emergency ACM Abatement and Dehumidification of First and Second Floor", Chet Holifield Federal Building, 24000 Avila Rd., Laguna Niguel, CA 92677. 

2. DESCRIPTION OF SERVICES REQUIRED The construction services required under this justification include emergency ACM abatement, How Does A Dehumidifier Work water damage treatment, dehumidification and drywall repair and painting. The estimated construction cost is $500,120.00 Some of these specialized requirements include, but are not limited to, the following: 

Set up localized containment and install negative air machines How Does A Dehumidifier Work and dehumidifiers within the work areas, throughout 1st and 2nd Floors. Remove all water damaged asbestos containing drywall / joint compound, throughout 1st and 2nd floors. 

If pre-existing mold growth and/or suspect staining is observed during the removal process, How Does A Dehumidifier Work the mold contaminated asbestos containing drywall / joint compound shall be removed 2 ft. beyond any visible extent, throughout 1st and 2nd floors. Apply anti-microbial cleaning agent and scrub framing members with wire brush, 2ft. beyond the extent of visible suspect mold and/or staining. 

The visual presence of continued staining and/or mold growth into adjacent areas warrants the cleaning How Does A Dehumidifier Work and/or removal of the affected materials. All exposed surfaces shall be sanded and/or wire brushed and HEPA Vacuumed until a visually clean surface is achieved. Upon completion wet wipe remediated areas with an anti microbial cleaning detergent and HEPA vacuum a second time. 

All exposed HVAC vents and/or registers shall be cleaned accordingly within the 1st & 2nd floor work areas. Daily & final visual inspections How Does A Dehumidifier Work and onsite air monitoring for asbestos & mold will be conducted by an H2 Environmental representative. Patch, repair, paint drywall for First and Second Floor in contained area. Patch, repair, paint drywall for Third Floor.

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