tailieunhanh - RECOMMENDED VENTILATION STRATEGIES FOR ENERGY-EFFICIENT PRODUCTION HOMES

The results of experiments involving direct comparisons of root and penetrometer resistance indicate that penetrometers experience two to eight times greater resistance than plant roots penetrating soil (Table 1). Dexter (1987) suggests that this ratio of penetrometer resistance to root resistance is positively correlated with soil strength, being greater in ‘stronger’ soils. At present there is neither theoretical basis for this suggestion nor sufficient published data to justify such a conclusion, although the need for accurate prediction of this ratio is clear. Indirect evidence. | LBNL-40378 UC-000 RECOMMENDED VENTILATION STRATEGIES FOR ENERGY-EFFICIENT PRODUCTION HOMES Judy A. Roberson Richard E. Brown Jonathan G. Koomey Steve E. Greenberg Energy Analysis Department Environmental Energy Technologies Division Ernest Orlando Lawrence Berkeley National Laboratory University of California Berkeley CA 94720 USA This report can be found on the internet at http projects ESVentilation December 1998 The work described in this paper was supported by the . Environmental Protection Agency Office of Air and Radiation Atmospheric Pollution Prevention Division through the . Department of Energy under Contract No. DE-AC03-76SF00098. Abstract This report evaluates residential ventilation systems for the . Environmental Protection Agency s EPA s ENERGY STAR Homes program and recommends mechanical ventilation strategies for new low-infiltration energy-efficient single-family ENERGY STAR production site-built tract homes in four climates cold mixed cold and hot hot humid and hot arid. Our group in the Energy Analysis Department at Lawrence Berkeley National Lab compared residential ventilation strategies in four climates according to three criteria total annualized costs the sum of annualized capital cost and annual operating cost predominant indoor pressure induced by the ventilation system and distribution of ventilation air within the home. The mechanical ventilation systems modeled deliver air changes per hour continuously regardless of actual infiltration or occupant window-opening behavior. Based on the assumptions and analysis described in this report we recommend independently ducted multi-port supply ventilation in all climates except cold because this strategy provides the safety and health benefits of positive indoor pressure as well as the ability to dehumidify and filter ventilation air. In cold climates we recommend that multi-port supply ventilation be balanced by a single-port exhaust ventilation fan and that .

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