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In addition it reports some corrections made to the simulation models used in order to correct some errors in the TRNSYS building model for Atlanta and in the refrigerant pressure drop calculation in the water-to-refrigerant evaporator module of the ORNL Heat Pump Design Model (HPDM) used for the IHP analyses. From the foregoing it is reasonable to assume that a winter space RH range of 30-40% would be an acceptable compromise between comfort considerations and limitation of growth rates for dust mites and many bacteria. They also indicate that many disease bacteria life spans are minimized when space RH is held within a 30-60% range. Harriman, et al (2001) note that for RH levels of 35% or higher, electrostatic shocks are minimized and that dust mites cannot live at RH levels below 40%. Table 3 in chapter 9 of the same reference suggests a 30-55% RH range for winter as established by a Canadian study of exposure limits for residential indoor environments (EHD 1987). Design criteria for the earth-air heat exchanger were determined based on the information obtained in the two phases of this = 68-69F based on comfort (ASHRAE 2005). Results of the first phase were used to verify the computer model. The analytical phase developed a finite element program for simulating the earth-air heat exchanger and studying the effects of important parameters on the heat transfer rate and the air temperature. The experimental phase consisted of an earth-air exchanger installation from which data were collected during hot weather (cooling effect), cold weather (heating effect), and mild weather performances. The heat transfer in an earth-air heat exchanger was studied in two phases to develop design criteria for these systems.
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Providing this optimum environment by reducing heating and cooling loads would reduce energy costs and increase profits for the producer. Minimizing temperature extremes of inlet ventilation air to the livestock building by passing the air through underground ducts would accomplish this goal. Optimizing the thermal environment of a livestock building is beneficial to the growth and production of the animal.