Submitted by Maria.Kapsalaki on Thu, 10/31/2013 - 10:46
In the previous study, a numerical method which simulates combined heat and moisture transfer process in solid desiccant materials was investigated. The calculation results successfully reproduced the cyclic process of the moisture adsorption and desorption. The validity of the numerical simulation method for the desiccant wheel was examined by the comparison between the experiment and the numerical simulation of the desiccant dehumidifier.
Mechanical ventilation may be necessary to provide adequate ventilation in new houses due to the relatively low rates of infiltration achieved in new construction. However, in hot and humid climates, increased ventilation may raise indoor humidity to an undesirable level. A study was undertaken by the Florida Solar Energy Center (FSEC) to evaluate the humidity effects of different mechanical ventilation strategies for such climates. The study was conducted in a new 141-m2 manufactured house sited at the FSEC campus.
In hot and humid climates, desiccant air-conditioning systems have been suggested as suitable forimproving Indoor Air Quality (IAQ). Generally as dehumidification devices, various types of silica gelrotor have been used to control humidity.
Twenty homes were tested and monitored in Houston, Texas, U.S.A. to evaluate humidity controlperformance and operating cost of six different integrated dehumidification and ventilation systems that could be applied by production homebuilders. Fourteen houses had one of the six integrated dehumidification and ventilation systems and also met a high standard of energy efficiency criteria.
States that air humidity in swimming pools must be closely controlled on the one hand for user comfort, and on the other for the durability of the building structure. Describes how the INSEP pool in Paris has opted for a partial thermodynamic dehumidification system. Finds that although the condensate levels were higher than recommended at time of measuring, this pool nevertheless showed satisfactory results in terms of energy consumption and costs. Also found that the heat demand of the pool compared favourably with an ordinary sports hall in relation to outdoor temperatures.
In discussion with the person in charge of provision for the many swimming pools in the Paris region, both municipal and school, the article gives and overview of the problems to be tackled in terms of dehumidification.
Environmental control of basement by heating and dehumidifying the air is widely used in summer. In general, ventilation can make the air more humid. From the point of view of energy saving, it is suggested to exchange humidity and to insulate heat between stale air and fresh air during ventilating basement. To improve the efficient of the exchanging system, the characteristics of heat and mass transfer of membrane device are studied. It is presented that the membrane device exchange system not only can keep the heat but also can remove moisture of the fresh air.
The traditional way to dehumidify the outdoor air in an A/C-system is by cooling the air downbelow the dew point temperature. For this process a refrigeration system is necessary torealise these low temperatures. Nowadays the disadvantages of refrigeration systems fordehumidification are widely known. An alternative method to dehumidify the air is byseparating the process of dehumidification and cooling.The paper will present a testing plant of 1200 m air/h which is installed in the University ofEssen. This A/C-systems works with liquid desiccants.