Dehumidification >> How To Dehumidify A Water Damaged Basement

Purified water and feed water samples from cooper tubing condenser test was analyzed in How To Dehumidify A Water Damaged Basement this experiment. The ion removal efficiency is defined as ion concentration difference of the feed and purified water versus feed ion concentration. It present as equation as follow: 

Efficiency where Cf and Cp are ion concentrations of the feed water and purified water respectively, How To Dehumidify A Water Damaged Basement ppm. Table 4-1 shows the quality records of the system during the period of operating time. All the results how ion removal efficiency is larger than 98% which ion concentration of Na+ decline from about 3000 ppm to less than 10 ppm. 

And in some conditions, ion removed almost 100% by this process. Built-in capillary tubing condenser Figure 4-4 and 4-5 give the water productivity as a function of How To Dehumidify A Water Damaged Basement feed water temperature and flow rate. Increasing feed water temperature or flow rate will enhance purified water production. Especially when the feed water inlet flow rate was high such as 30 mL/min, water productivity observably increased with feed water temperature increase. 

The productivity of the copper tubing condenser separator system were ranged from 0.006 kg/(h.m2 ) to How To Dehumidify A Water Damaged Basement 0.05 kg/(h.m2 ) when the feed water temperature varied from 60 ºC to 80 ºC and flow rate increased from 10 mL/min to 30 mL/min. And the deployment of built-in capillary tubing bundles shown considerably enhancement in water evaporation and subsequent water productivity. 

As shown in Figure 4-5, the built-in capillary tubing condenser separator system produced amount of How To Dehumidify A Water Damaged Basement purified water range from 0.03 kg/(h.m2 ) to 0.31 kg/(h.m2 ) which significantly enhanced water production about 6 times compare with copper tubing condenser separator system. As shown in Figure 4-6, it is also interesting to observe that the water recovery was increased with the increase of feed water temperature and flow rate. 

We attributed such an improvement in water productivity to the fast heat transfer and enhanced energy efficiency. The condensation-released latent heat at internal surface of How To Dehumidify A Water Damaged Basement capillary tubing will transport across the thin walls to the external surface and compensate the evaporation-provoked cooling effect. Apparently, large airwater contact surface area and direct heat reuse will benefit the energy efficiency. 

Figure 4-7 gives the water productivity and humidity at the top of humidifier as a function of How To Dehumidify A Water Damaged Basement feed water flow rate. This test ran at a constant temperature of 80 ºC and varied feed water flow rate ranging from 10 to 30 mL/min, carrying air flow rate was set at 1000 LPH. The relative humidity of an air-water mixture is defined as the ratio of the partial pressure of water vapor in the mixture to the saturated vapor pressure of water at a prescribed temperature. 

Relative humidity is normally expressed as a percentage and is defined in the following manner where Humidity R is the relative humidity of the air-water mixture, %; P water-vapor is How To Dehumidify A Water Damaged Basement the partial pressure of water vapor; and P saturated-vapor is the saturated vapor pressure of water at the temperature of the air-water mixture. In this experiment, saturated vapor pressures are 149.4 mmHg, 233.7 mmHg, and 355.1 mmHg at 60 ºC, 70 ºC, and 80 ºC, respectively. 

Partial pressure is defined as, in a mixture gases, the pressure which one gas would have if it alone occupied the volume of the mixture gases [Henrickson, 2005]. By the definition of How To Dehumidify A Water Damaged Basement partial pressure, the total pressure of a gas mixture is the sum of the partial pressures of each individual gas in the mixture. Total absolute pressure is 1 atm (atmospheric pressure) which is equal to 680 mmHg. Volume fraction of water vapor is calculated as: water vapor carrying air water vapor water vapor Volume fraction where V water-vapor and V carrying-air are volume of water vapor and dry carrying air inlet in unit time respectively. 

We assume that all the water vapor at the top of humidifier was condensed and collected as purified water. The water vapor volume can be converted to water productivity. As shown in Figure 4-6, How To Dehumidify A Water Damaged Basement the water humidity at top of the copper tubing humidifier increased from 10.8% to 41% as the feed flow rate was increased from 10 ml/min to 30 mL/min, resulting in monotonically increase in clean water productivity. The deployment of built-in capillary tubing bundle show considerably enhancement in water evaporation and subsequent water productivity. 

The water humidity was increased from 18.4% to 60.7%, resulting in higher water productivity upon subsequent cooling from 0.048 to 0.311 kg/(h.m2 ). Different with How To Dehumidify A Water Damaged Basement copper tubing humidifier, built-in capillary tubing makes 1.2 m2 additional heat exchange area which accelerate latent heat transport from humidify side to dehumidify side. As the dehumidify side cooling down faster and condense area surface increased, purified water was accumulate much more than copper tubing separator in the same time. 

Also increasing feed water temperature and feed flow rate increased water humidity at top of humidifier, resulting in enhancement in water productivity [Hamieh et al., 2006]. Apparently, How To Dehumidify A Water Damaged Basement the unit energy consumption of produced water purification declines with increase of operating temperature, suggesting the preferred operating conditions at high temperature and high water flow rate. 4.3 Heat efficiency Humidification-dehumidification process was developed to purify produced water because of the advantage of using the co-produced energy and high energy efficiency. 

It used elevated temperature produced water to humidify dry air and retrieved the heat from How To Dehumidify A Water Damaged Basement water vapor condensation along the wall of tube. And mass exchange also may increases the heat flux so that heat reuse efficiency will be enhanced. [Holzhauer, 1979; Leidenfrost et al., 1979; Guinn et al., 1981; Papaefthimiou et al., 2006] Figure 4-8 schematically shows the mass flow of the produced water purification unit. 

To quantify the energy input during the operating process, dehumidified air at 25 ºC was used as How To Dehumidify A Water Damaged Basement carrier gas. The feed water was heated to elevated temperature at 60 ºC and 80 ºC. The gas and liquid exiting the system include: (1) concentrated wastewater, (2) purified clean water, (3) water vapor, and (4) air. Temperatures at each exiting port were recorded for energy efficiency analysis.


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