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Abstract
The ability of HV AC systems to maintain proper indoor humidity levels depends on the building load characteristics and the climate characteristics. The proper application, selection, sizing and operation of the HV AC equipment are the used keys to control humidity levels. This requires that the HV AC system meets sensible and latent loads, not only at design conditions (full load), but also over a broad range of off-design conditions (part loads). Consequently, the selection of HV AC equipment to best control humidity in commercial buildings requires a careful analysis of a range of humidity control options in a variety of different outdoor conditions. This thesis has been established to develop a plan to guide the evaluation of humidity control.
The plan is based on separate evaluation of humidity control options and load requirements of commercial buildings. The analysis of building load characteristics sought to identify and describe key factors that affect humidity control in Bibliotheca Alexandria building. It involved updating the weather information for Alexandria, review of cooling load calculations of 64 air handling units and calculation diversified load at three different outdoor design conditions (”39°C DB & 26°C WB” and other basic conditions). The cooling and dehumidification requirements for each of the 64 air handling units are to be evaluated at three design conditions. The results of these evaluations will be used to identify the performance of the various humidity control options.
The results indicate that the suggested new control approach: ”The ability to separately control space temperature and humidity by varying the air flow rate based on the space humidity condition, varying chilled water temperature based on space temperature condition, while maintaining the required outdoor ventilation air flow rate,” is the optimum control to maintain proper indoor humidity levels while minimize energy consumption.