ABSTRACT
Tibet has been classified as a heating area. The high-cold and high-altitude counties in Lhasa have also implemented heating projects to improve the thermal insulation performance of Lhasa's envelope, which is crucial to building energy conservation in Lhasa. In this paper, the thermal conductivity of the main materials of Lhasa residential building walls, stone and solid sandstone concrete, is tested in the laboratory. Then, the thermal resistance and thermal conductivity of typical wall structures of residential buildings are calculated theoretically using the thermal conductivity of materials measured in the laboratory. Next, the average thermal resistance and average steady-state thermal conductivity of walls are calculated using the arithmetic mean method based on the field test data. Finally, the theoretical calculation values of wall heat transfer resistance and wall heat transfer coefficient are compared with the field test values, and the deviation rate between them is small. Through the field test data, it is verified that the wall heat transfer coefficient calculated from the wall structure estimated by the thermal conductivity coefficient measured in the laboratory is accurate and feasible. Based on this research conclusion, combined with the economic conditions, climate environment, and architectural style of Lhasa, it is proposed that the energy conservation design scheme of the wall in this area is the internal insulation wall of the vacuum insulation board. This wall energy conservation scheme provides a reference for the promotion of energy conservation transformation of existing residential buildings in Lhasa and the new construction of green energy-saving residential buildings.
