Energy savings potential of chilled-ceiling combined with desiccant cooling in hot and humid climates

Review on Solar Powered Desiccant Wheel Cooling System

“…Solid desiccant dehumidifiers can be also integrated into radiant cooling systems with energy saving advantages [6]. Desiccant enhanced nocturnal radiation cooling and dehumidification is another interesting application to achieve both sensible and latent heat cooling in hot humid climates [7,8]. The capacity of building materials to store moisture and thermal energy is used during the day and the desiccant bed removes moisture during the night.…”

“…(a) Functioning scheme of a desiccant wheel, [7] 3. THE REGENERATION HEAT SOURCE Different energy sources and technologies can be adopted to supply the necessary amount of heat at the required regeneration temperature.…”

Exergy Analyses and Modelling of a Novel Extra-Low Temperature Dedicated Outdoor Air System

“…The use of a dedicated outdoor air system (DOAS) for air-conditioning of office buildings has been widely investigated in recent years for better indoor air quality and energy efficiency [1]. A conventional DOAS often comprises two systems: an outdoor air (OA) system dedicated to produce high quantities of OA that handles the entire latent loads and part of the space sensible loads; and a terminal system to handle the remaining space sensible loads.…”

“…As such, OA flow rate is higher and return air (RA) does not need to be circulated across different zones to enhance the indoor air quality. The OA system often uses active-desiccant technology; whilst the terminal system can be chilled beams/ceilings [2]. Energy savings can be derived from reheating and dehumidification energy reductions.…”

“…The use of active-desiccant technology to produce OA, despite it is energy effective [3], is space intensive to hinder its popular use in land scarcity cities like Hong Kong [4]. The use of chilled beams/ceilings as a terminal system will cause condensation problem, especially in subtropical regions where summers are long, hot and humid [2]. To solve the condensation problem, previous works proposed to keep beam/ceiling surface temperature above the indoor dew-point temperature by using different control methods [5] and systems [29].…”