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Performance Study of a Thermal-Envelope House. Phase I. Final Report

机译:热信封房的性能研究。第一阶段最终报告

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The thermal envelope house was shown to perform quite well whether the weather was cold and cloudy, mild and clear, or cold and clear. Due to the timing of the contract initiation, the instrumentation was not in position during the coldest, low-insolation months of December and January, but it was in operation in late February when temperatures dropped to below 10 exp 0 F at night and remained below 45 exp 0 F during the day. Temperatures within the house could be kept above 68 exp 0 F on the worst days with a minimum use of the wood stove. The instrumentation showed that there was thermally induced circulation around the thermal envelope, but this flow rate was lower than was expected, never exceeding .5 ft/second and frequently below the noise level of our relatively sensitive hot wire anemometer. On a sunny day, air was warmed in the greenhouse and rose to induce air circulation in the loop. However, due to the low air flow rates and energy loss through the attic and north wall, the air reaching the crawlspace had little energy available for storage. Surface and subsurface temperature measurements showed the earth in the crawlspace to remain well below adequate storage temperatures, remaining below 60 exp 0 F at all times. Temperature measurements within the living space showed the temperatures to be remarkably uniform throughout the house. The uninsulated, double concrete-block west wall was found to be a significant source of energy loss. An exterior scan of the house using an IGA Thermovision infrared camera showed the exterior of the west wall to be significantly higher in temperature than the north wall. The tests also showed that internal loads (people, lights, appliances, etc.,) were a significant factor in maintaining interior temperature levels, a characteristic of all well-insulated houses. (ERA citation 07:043029)

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