This paper describes a 17 month field test conducted in four residences in the Dallas TX area aimed at evaluating the use of gas-fired desiccant dehumidification in reducing indoor relative humidity levels. Baseline comfort and weather data were collected from June 2003 to November 2003. A residential sized single wheel gas-fired desiccant dehumidifier was then installed in each house and monitored for an 11 month period from November 2003 through October 2004. Indoor temperature and humidity levels along with air conditioner and desiccant unit operation were monitored before and after desiccant system installation. House characteristics and a redundant monitoring strategy (allowing remote and on-site data collection) are outlined. Field experience with desiccant system operation is discussed, including delivered air temperature, ignition, and control issues and associated remedial actions. The impact of three types of dehumidistat sensor technology on unit operation and comfort levels is evaluated. Finally, the effect of desiccant operation on indoor relative humidity levels and electric and gas utility bills is discussed. Desiccant operation did result in a substantial reduction in indoor relative humidity especially during shoulder months, but at a modest increase in electric and gas usage. The increase in utility usage depended on desiccant control strategy and living habits.
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