The purposes of this thesis were to investigate the contemporary field of air conditioning in industry and education; to determine what equipment should be recommended for installation in the Mechanical Engineering Laboratory of the Virginia Polytechnic Institute; and to design the components and controls for a unit which will be modern, practical, and educational. The components of the unit were designed or selected on the basis of the research summarized in this thesis in Chapter II, ”Review of Literature.” A central fan system was designed. Within the necessary design limitations, every effort was made to incorporate as many different methods as possible which demonstrate air conditioning processes, and every effort was made to enhance the effectiveness and attractiveness of the unit for its intended purposes of demonstration and research. The main part of the conditioning apparatus will be supported in ductwork about four feet above the floor level so that weigh tanks, scales, condensate coolers, and drain lines may be placed underneath, thereby allowing the processes to be controlled and observed at normal eye level. In order to keep within the prescribed area, the air measurement chamber and fan will be mounted at a higher level. Ducts will carry air from the existing insulated test room to the unit and return conditioned air to the test room. A duct to extend from an existing roof opening will be large enough to carry 2000 cfm and will contain a freeze-resistant tempering coil. Manually adjusted opposed blade dampers control air quantities at the junction of the outside air duct and the return air from the test room. Air passing through the built-up unit will pass through the following components: disposable filter, electronic filter, activated carbon filter, steam preheater coll, direct expansion coll, hot or chilled water coil, opposed blade face and bypass dampers, washer, steam reheater coil, air temperature measuring chamber, air flow measuring chamber, and centrifugal fan with inlet vanes. Among the accessory components are a Refrigerant 12 refrigeration unit with water-cooled condenser, water chiller, steam water heater, high-head circulated pump, and a wide assortment of valves and actuators for automatic control on any one of the many cycles being run. Each piece of conditioning equipment operating on the summer cycle was designed for a nominal cooling capacity of five tone when the system is circulating the equivalent of 2000 standard cfm of air. The winter cycle equipment was designed to supply humidified air to the test chamber at not less than 100°F when 9000 pounds per hour of outside air at 0°F enters the equipment. The apparatus will be capable of maintaining within close limits any reasonable air temperature and humidity under all conditions of operation on both cooling and heating cycles. / Master of Science

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Sanden international, an automobile air conditioning compressor manufacturer, was facing a problem in its incoming material inspection procedures. Although the company had designed and was using its own sampling plan, some managers and supervisors where not confident of its reliability. Sanden recently established a goal for its total number of defects per supplier as one part per million. Achievement of this target required reviews of the existing sampling plan. The purpose of this project was to help Sandra identify the best alternatives for its incoming material inspection procedures. To do that considerations were made about the usefulness of sampling inspections, theoretical aspects of inspection sampling plans were examined, current sampling plans were analyzed and recommendations were made.

published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy

In South Africa, a significant amount of electrical energy is used for air conditioning in commercial buildings, on account of the high humidity experienced. Due to its geographical location, the levels of solar irradiation and the demand for air-conditioning of commercial buildings reach maximum levels simultaneously. The South African region daily solar radiation average varies between 4.5 and 6.5 kWh/m2 and when compared to the United States 3.6 kWh/m2 and Europe’s 2.5 kWh/m2 , solar thermal powered cooling technologies has significant potential as this solar irradiation is also available all year around [1]. Utilizing solar energy for an air conditioning system has the advantage that the availability of solar radiation and the need for cooling reach maximum levels simultaneously and proportionally. This type of air conditioning system has an electrical energy saving benefit in light of increasing energy tariffs and the energy crisis currently facing Eskom in South Africa. Solar-assisted Absorption Cooling systems decreases the peak electricity consumption, is less noisy and vibration free, since it does not contain a compressor and this gives a higher reliability, low maintenance and its electricity consumption is approximately four times less (21.8kW versus 5.5kW for 35kW of Cooling) than that of an electric driven chiller containing a mechanical compressor [2]. However, due to the high capital cost of solar powered air-conditioning plants, it is essential that a feasibility analysis be undertaken to indicate and establish a return on capital investment. The main objective of the present study is to investigate and establish the feasibility of a solar-assisted air-conditioning system based on Lithium Bromide and Water (LiBr/H2O) absorption chillers on a medium scale for commercial buildings in terms of energy saving and performance. This study presents the results of the experiment on a solar-assisted air-conditioning facility constructed and installed in October 2009 at Pretoria’s Netcare Moot Hospital. This study has confirmed that a payback period of 13 months can be achieved and the performance parameters of the manufacturer’s specifications for a solar-assisted air conditioning system are exceeded for the South African climate. / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2012.

Thesis (M. Phil.)--University of Hong Kong, 1993.

The diploma thesis deals with the cleaning of car air conditioning system with ozone. The aim is to design equipment for ozone production, its location and cleaning algorithm. The thesis is divided into two parts. The introductory theoretical part describes the principle of operation of conventional automotive air conditioning, then discusses the methods of pollution and solutions to remove these pollutions. The theoretical part ends with a summary of information on ozone. The practical part is continuously followed by the design of device for the ozone production directly in the car. The final part deals with the location of such a device in a car, measuring its parameters and evaluating the results.

The air conditioning systems currently utilized in automobiles are the vapor compression systems. This type of system has many disadvantages: the refrigerant used is not environmentally friendly, the compressor is in competition with the engine coolant system, and the compressor uses a significant portion of the engine power. A waste heat driven absorption refrigeration system is one alternative to the current systems that could address these problems. The absorption refrigeration system uses solutions for the absorbent-refrigerant pair that do not harm the environment. This investigation includes a theoretical analysis of the feasibility of absorption air conditioning system in automotive applications. Also, a comparison of the power requirements of the proposed system and the vapor compression system is performed.

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Call number: LD2668 .T4 1978 S24 / Master of Science