Category: Humidification

Humidification-Dehumidification Desalination The humidification-dehumidification (HDH) method is principally the evaporation of water into a carrier gas and then vapor stripping of that carrier gas [53]. A simple HDH desalination is shown schematically in Fig. 13. This method has attracted the attention of desalination designers since 2006 because it has a lower operating temperature than other thermal distillation processes (< 80°C), and its operating pressure…

Solar humidification-dehumidification A solar humidification-dehumidification (SHDH) technology comprises a humidifier, a dehumidifier, and a heater driven by solar energy. Since both humidification as well as dehumidification takes place in separate chambers, they can be independently designed and optimized as per conditions and parameters. The SHDH process is based on the moisture carrying property of warm air which effects into…

Solar humidification and dehumidification desalination Solar humidification and dehumidification system follows the very basic natural water purification system (Kalidasa Murugavel & Srithar, 2011; Narayan et al., 2010). The principle of the solar humidification and dehumidification desalination (SHDD) system is basically the evaporation of salty water into an airstream and then the successive condensation of the air stream to collect pure water. Air can hold water…

dehumidification Humidification–dehumidification (HDH) is a distillation process (Fig. 17.14). The process is driven by the ability of air at higher temperatures to carry water vapor (Kabeel et al., 2013). This process consists of a humidifier, a dehumidifier, and a heater to heat carrier gas and the feedwater system (Narayan et al., 2010). A carrier gas is brought in contact with the…

dehumidification systems HDH units can be categorized into three groups [135]. The first category is based on the energy source employed, including wind, solar, geothermal, electrical energies, or hybrid devices. An attractive and promising aspect of this classification is the use of renewable and low-grade energy resources [47,136]. The second category is related to the type of heated…

Humidifier run time Humidification is an expensive process and it is useful to be able to assess energy costs when considering its inclusion in a plant. It is possible from meteorological records for any particular area to find the time in hours per year and extent to which the external moisture content is, on average, at…

Humidification, steam delivery Humidification of the hydrogen fuel is essential in low temperature PEMFC systems. This adds complexity and costs to the system, and significant efforts are in progress to minimise the need for humidification. Membrane humidification systems are commonly used in fuel humidification. Water purity is critical and is cleaned using deionising filters. Water is recovered from the…

Abstract Humidification/dehumidification (H/D) is in fact a small to medium capacity desalination method driven by solar energy or waste heat. In this chapter, initially a short historical introduction is given on how this method is derived from solar distillation procedure by using separate devices (champers or towers) for evaporation and condensation processes in contrary to solar distillation where the two operations…

Energy impacts Adiabatic humidification can offer an advantage if humidification is required at the same time that cooling is needed. Some type of cooling is needed most of the year for many air-handling systems. This type of humidification will provide a free cooling effect along with the humidifying. However, during the heating season adiabatic humidification can result…

The simplest method of humidifying the inspired gases is the instillation of water droplets directly into the trachea, but this is the least satisfactory technique and cannot be recommended for routine use. It carries the danger that, if the drip is run too rapidly, the water or saline instilled into the trachea may lead to a…