Dehumidification >> How To Set Up A Flooded Basement Dehumidifier

In contrast, humidification-dehumidification (HDH) seawater desalination represents a relatively new desalination method based on heat and mass-transfer processes. Normal atmospheric air is employed as the medium to convert seawater to freshwater. HDH seawater desalination involves two processes. Seawater is first converted to water vapor by How To Set Up A Flooded Basement Dehumidifier evaporation into dry air in an evaporator (humidification).
 
This water vapor is then condensed out from the air in a condenser to produce freshwater (dehumidification). seawater desalination operates under more moderate working temperatures (<80°C) and near-ambient system pressures and requires only moderate flow pressures. Given How To Set Up A Flooded Basement Dehumidifier these more moderate system specifications, low-cost materials such as conventional plastics may be used for system construction. These relatively easy-to-achieve construction requirements are expected to lead to a lower infrastructure cost.
 
several literature studies are available that explore HDH as an effective means for seawater desalination. The early work includes those by Bourouni et al. (2001), Al-Hallaj et al. (1998), How To Set Up A Flooded Basement Dehumidifier Assouad and Lavan (1988), Muller-Holst et al. (1999), Abdel-Salam et al. (1993), Xiong et al. (2005a), Shaobo et al. (2005), Xiong et al. (2005b), El-Dessouky (1989), Goosen et al. (2003), and Al-Hallaj and Selman (2002). In these studies conventional shell-and-tube heat exchangers were used as condensers for the dehumidification process.
 
 Film condensation over tubes is extremely inefficient as the process involves condensing water vapor out of a mixture of air and water vapor. The presence of air adversely affects the access of water vapor to the cold tube surface. Klausner and co-workers at the How To Set Up A Flooded Basement Dehumidifier University of Florida described (Klausner et al. 2004, Klausner et al. 2006, Li et al. 2006a, Li et al. 2006b) an innovative diffusion-driven desalination technology to overcome the aforementioned shortcoming.
 
 To enhance the condensation in the presence of air, a direct-contact condenser was used in diffusion-driven desalination. The diffusion-driven desalination was powered by waste heat derived from low-pressure condensing steam from a power plant and is viable for industrial-scale freshwater production. Practical How To Set Up A Flooded Basement Dehumidifier implementation of solar-energy-driven HDH seawater desalination systems requires a fundamental understanding of thermal/fluid transport phenomena in virtually all system components.
 
Our research team launched a research program to establish such a knowledge base through combined theoretical modeling and experimental study. The project supported by the extension of the 2008 U.S. Geological Survey State Water How To Set Up A Flooded Basement Dehumidifier Resources Research Institute Program (WRRIP 2008) constitutes the Phase II of the research program. The focus of the Phase II research is on developing a laboratory-scale experimental system to studyparametric trends of the freshwater-production rate.
 
 Methodology Figure 1 shows a schematic diagram of the laboratory-scale experimental system designed and constructed in our research lab. The system is composed of three main fluid-circulation lines identified in Figure 1 as saltwater,air/vapor, and freshwater. In the How To Set Up A Flooded Basement Dehumidifier saltwater line an insulated tank stores the saltwater. Heat generated by five 1000-W electrical cartridge heaters installed in the tank, used in the experimental system to simulate solar-energy input, raises the saltwater temperature.
 
 A centrifugal pump transports the heated saltwater to an evaporator. The heated saltwater is sprayed through a nozzle into How To Set Up A Flooded Basement Dehumidifier the top of the evaporator so that it comes into direct contact with ambient-moisture air being pumped into the bottom of the evaporator. A portion of the heated saltwater evaporates and thus humidifies the ambient air.
 
Any saltwater not evaporated collects at the bottom of the evaporator and is returned to the insulated storage tank as high-salt brine. In the air/vapor line ambient air is pumped, using a forced-draft blower, How To Set Up A Flooded Basement Dehumidifier into the bottom of the evaporator where it rises and comes into direct contact with the heated saltwater being sprayed into the top of the evaporator chamber.
 
Direct contact with the heated saltwater humidifies the ambient air. The now-humidified air is drawn out of the evaporator chamber and pumped into a condenser. In the condenser chamber the How To Set Up A Flooded Basement Dehumidifier now-humidified air comes into direct contact with cold, working, freshwater being sprayed into the top of the condenser. From the humid airsalt free water vapor now condenses into liquid water and mixes into the working freshwater. The lowered-humidity air remaining after the condensation process is ejected into the external ambient air as exhaust.
 
 In the freshwater line a storage tank holds a fixed amount (limited by the presence of a drain in the sidewall of the tank) of working freshwater. This water is circulated using a centrifugal pump. Before How To Set Up A Flooded Basement Dehumidifier entering the condenser the freshwater is cooled in a chiller to lower its temperature. Additional freshwater captured through the condensation process, in excess of the storage tank's fixed limit of working water, is the newly desalinated water and flows through the storage-tank's drain into a collecting tank.
 
 Figure 2 shows a picture of the experimental system. The evaporator and condenser chambers are shown in the center of the picture. Both are wrapped with black polyethylene foam insulation to prevent heat transfer to or from the ambient environment. The air and water piping is also covered with the same insulation. Figure 2. How To Set Up A Flooded Basement Dehumidifier Picture of desalination lab-scale experimental system. To measure the various thermal/fluid parameters during testing the experimental system is fully instrumented.
 
 Thermocouples installed at both the inlets and outlets How To Set Up A Flooded Basement Dehumidifier of the evaporator and condenser measure the corresponding inlet and outlet temperatures of air and water. A computer-based data-acquisition system automatically records the thermocouple readings. Saltwater and freshwater flow rates are measured using two rotameters. Air velocity in the pipe upstream of the evaporator is measured using a hot-wire thermo-anemometer.
 
Heating power of the cartridge heaters is measured using a precision power meter. Freshwater production is determined by collecting the freshwater overflow through the storage-tank's drain for a period of time and dividing the volume of the collected water by the time period. In use the components of the experimental system are first set to the desired testing constraints. The system is then allowed to reach a How To Set Up A Flooded Basement Dehumidifier steady state where thermal and fluid-flow parameters no longer vary with time.
 
 Once the entire system has reached a steady state, readings are computer recorded at 5-second intervals from the thermo-couples for, depending on fresh water production rates, 20 to 40 minutes. Readings from the anemometer, power meter, and rotameters are manually How To Set Up A Flooded Basement Dehumidifier recorded. During the steady-state measurement period freshwater production is collected and, at the conclusion of the test period, its volume is measured and recorded.

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