Timothy E. Manley.Even though they represent an acceptable alternative for mechanical evaporative coolers, scalping strategies are afflicted by their limited applications when it comes to air flow and small rate of warmth transfer. Within this thesis, a brand new air scoop is designed to overcome the above mentioned pointed out limitations. Essentially, it’s a mixture of an aura scoop along with a chimney. This configuration generates suction pressure in the tower mind due to the wind acceleration in a nozzle. When there’s no wind, the tower functions like a solar chimney that produces a stack effect between your inlet stack (air scoop) and also the the opening vent. The benefits of this technique is summarized within the following: First, the suction pressure works better than positive pressure in dragging the environment backward and forward stacks. Also this technique performs even without the any wind which takes away from the performance of other conventional air scoops. Due to the specific relation between inlet and outlet stacks, the greater the peak difference the bener. Which means that an inlet air scoops as little as your window sill level gives better result. This actually can lead to using small inlet scoops opening towards the windward side along with a central chimney to exhaust the new room air and change it with fresh outside air. Such configuration facilitates a much better and controlled indoor air flow with no need to use home windows for natural ventilation. Economic analysis analyzing numerous scenarios which include the environment scoop/ chimney plan along with other strategies for example wall insulation and lightweight-Eco-friendly Low-E glazing has proven the tradeoffs between increasing the indoor thermal comfort and also the payback period or even the economic practicality of all these scenarios.
Finally, architectural designs were suggested to exhibit how a few of the systems discussed within this study is going to be expressed architecturally and also to what extend the regional identity can express itself through addressing the ecological facets of the region.
Sharag-Eldin, Adil MKay. (Adil Mustafa Kamal)
Includes bibliographical references (leaves 245-250).
Residential architectural design should fulfill both comfort and also the social needs from the occupants. Khartoum, the main city from the Sudan was selected with this study due to two reasons The very first is its abnormally hot-arid climate (thus cooling interior spaces turns into a crucial design consideration). and the second reason is its multi-dimensional urban identity. The town is a combination of African, Arab, and European influences and resembles simultaneously an oasis in the center of the desert. The study follows two distinct but carefully related pathways. The very first is the research and research into the passive and hybrid cooling systems and techniques to which the weather conditions of Khartoum determines the size and type of every approach. The 2nd stage from the research will concentrate on the architectural implications of those systems. Both directions result in better knowledge of the built atmosphere and it is interactions with man. Two moves were taken into consideration, when thinking about the cooling potentials within this climate.
First, the solar control strategies that have been discovered to be most suitable in Khartoum weather conditions. Included in this are using eggcrate shading devices on all openings aside from southern exposures which may be shaded effectively by vertical fins to lessen the solar transmission through glazed surfaces. The research demonstrated additionally that lowering the glazed area cuts down on the total heat gain however this affects negatively both daylighting and also the freedom of design to include the outside spaces. This is often solved using the Low-E glass that has better thermal qualities when it comes to reducing both solar transmission as well as heat conduction. The outcomes from the study demonstrated that using single Light-Eco-friendly Low-E glass enables one and half occasions bigger glass area with similar quantity of heat gain. For the similar area, the Double Low-E glass can help to eliminate heat gain form these surfaces with a factor of two. Economically, their me is difficult to justify due to their forecasted high costs than the DS single pane obvious glass. Another efficient way of manipulating the heat gain through buildingskin is by using thermal insulation around the walls and roof. Roof insulation that is generally specified by Khartoum was discovered to be thermally acceptable and extra insulation won’t reduce heat gain appreciably because the roof share has already been reduced with fundamental insulation. The wall insulation strategy demonstrated to become economically achievable and doesn’t require skilled labor to set up in order to maintain as it is protected against the elements. Landscaping is yet another move which will enhance the ecological quality through shading and evaporatively cooling the nearby spaces and simultaneously increase the visual excellence of the space, but it’s not economical. The 2nd move ended up being to promote heat losses through ventilation, convection, radiation, and evaporation. Due to the ecological condition of Khartoum, the very first three moves are limited to song during the day or even the year. Nonetheless, mixture of each one with evaporative cooling boosts the thermal comfort. The desert-type evaporative coolers lessen the indoor temperature while increasing the relative humidity that is needed within the dry periods of the season. Two-stage coolers which mixes both evaporative (adiabatic) and sensible cooling concepts boosts the rate of warmth removal and therefore reduces acquired indoor temperature. The environment scoops or wind catchers are convective and evaporative cooling systems that admit high winds at high elevations to become circulated inside areas for ventilation. This air could be further cooled be passing the environment stream over wet Clay jars or through wetted pads.
by Adil M.K. Sharag-Eldin.