Abstract
A dedicated outdoor air system (DOAS) can be designed to supply 100% of the outside air and meet the latent load of the room with dry air. The objectives of this study were to develop a model of a DOAS equipped with a desiccant wheel and a vapor-compression refrigeration system, build a prototype, validate the model with experimental data, and gain knowledge about the system operation. The test facility was designed with the desiccant wheel downstream of the cooling coil to take advantage of the operating principles of cooling coils and desiccants. A model of the DOAS was developed in the TRNSYS environment. The root mean standard error (RMSE) was used for model validation by comparing the measured air and refrigerant properties with the corresponding calculated values. The results obtained with the developed model showed that the DOAS was able to maintain an indoor humidity ratio depending on outdoor conditions. Laboratory tests were also used to investigate the effect of changes in the regeneration air temperature and the process airflow rate on the process air humidity ratio at the outlet of the wheel. The results are consistent with the technical literature.
Highlights
Buildings account for approximately 40% of final energy consumption in the European Union (EU), making them a central focus of the EU’s energy efficiency policy
Two essential attributes of air conditioning systems intended to provide occupants of a building with good air quality and thermal comfort are the supply of ventilation air and moisture control
A dedicated outdoor air system (DOAS) can be designed to supply 100% of the outside air and meet the latent load of the room with dry air
Summary
Buildings account for approximately 40% of final energy consumption in the European Union (EU), making them a central focus of the EU’s energy efficiency policy. Performance of Buildings [1] is the main legal instrument for meeting targets for energy efficiency in buildings by 2020. Article 9 of the Directive establishes as a specific objective that, by the end of 2020, all new buildings must have very low or nearly zero energy demands. The contribution of renewable energies must be significant. The EU provides guidelines [2] that will help member states develop plans for increasing the number of nearly zero energy buildings. Two essential attributes of air conditioning systems intended to provide occupants of a building with good air quality and thermal comfort are the supply of ventilation air and moisture control
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