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Aim diploma thesis is design and dimensioning central air - conditioning system of offices in industrial object. To air - conditioning was choose 2nd floor office building. Introduction is devoted short entrance to the areas air - conditioning and survey used air - conditioner systems inclusive basic types and possibility using single air - conditioning system practically. Follows computational part, in which is effected heat loss calculation, summer heat gains air - conditioned object and psychrometr calculation summer and winter operationing air - conditioning system. After calculation needed parameters is effected design distribution air, machine - room air conditioning, dimensioning air channels and ventilators, design incoming and off-take anemostats and their regulations. Next part includes calculation power consumption during the operationing designed air - conditioning system.

RIEGER, L.: Air conditioning of offices in administrative building The main contents of the thesis completed in the master's programme of the field M-TEP is to make a design of air-conditioning system of the offices on one floor of the office building, using dispositions according to the provided documentation. The theoretical part which deals with air-conditioning systems, devices and their constituent parts is followed by calculation chapters in which object properties are defined as heat loss, heat gain and the need for ventilation air. A proposal of air-conditioning system comprising psychrometric calculations, dimensioning of air distribution sizing, design of machine room and air-conditioner itself follows. The computational solution is supplemented by drawing documentation and specification of materials.

Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1980 / Bibliography: leaf 38. / by Eugenie Hainsworth. / B.S. / B.S. Massachusetts Institute of Technology, Department of Mechanical Engineering

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management

Thesis (M. Sc.)--University of Hong Kong, 2002. / Includes bibliographical references.

Thesis (M.Sc.)--University of Hong Kong, 2002. / Includes bibliographical references. Also available in print.

Digitized by Kansas Correctional Industries

Typescript, etc. / Digitized by Kansas State University Libraries

The work presented in this thesis investigates design, computer modelling and testing a sub-wet bulb temperature evaporative cooling system for space air conditioning in buildings. The context of this evaporative cooling technology design is specifically targeted at locations with a hot and dry climate such as that prevailing in most regions of Middle East countries. The focus of this technology is to address the ever-escalating energy consumption in buildings for space cooling using mechanical vapour compression air conditioning systems. In this work, two evaporative cooling configurations both based on sub-wet bulb temperature principle have been studied. Furthermore, in these designs, it was sought to adopt porous ceramic materials as wet media for the evaporative cooler and as building element and use of heat pipes as heat transfer devices. In the first test rig, the prototype system uses porous ceramic materials as part of a functioning building wall element. Experimental and modelling results were obtained for ambient inlet air dry bulb temperature of 30 and 35oC, relative humidity ranging from 35% to 55% and intake air velocity less than 2 (m/s). It was found that the design achieved sub-wet bulb air temperature conditions and a maximum cooling capacity approaching 242 W/m2 of exposed ceramic material wet surface area. The wet bulb effectiveness of the system was higher than unity. The second design exploits the high thermal conductivity of heat pipes to be integrated as an effective heat transfer device with wet porous ceramic flat panels for evaporative cooling. The thermal performance of the prototype was presented and the computer model was validated using laboratory tests at temperatures of 30 and 35oC and relative humidity ranging from 35% to 55%. It was found that at airflow rates of 0.0031kg/s, inlet dry-bulb temperature of 35oC and relative humidity of 35%, the supply air could be cooled to below the inlet air wet bulb temperature and achieve a maximum cooling capacity of about 206 W/m2 of wet ceramic surface area. It was shown that the computer model and experimental tests are largely in good agreement. Finally, a brief case study on direct evaporative cooling thermal performance and environmental impact was conducted as part of a field trip study conducted on an existing large scale installation in Mina Valley, Saudi Arabia. It was found that the evaporative cooling systems used for space cooling in pilgrims’ accommodations and in train stations could reduce energy consumption by as much as 75% and cut carbon dioxide emission by 78% compared to traditional vapour compression systems. This demonstrates strongly that in a region with a hot and dry climate such as Mina Valley, evaporative cooling systems can be an environmentally friendly and energy-efficient cooling system compared to conventional vapour compression systems.