System and method for measuring equivalent thermal resistance of building thermal insulation material

Abstract

The invention provides a system and method for measuring an equivalent thermal resistance of building thermal insulation materials. The measuring system comprises at least two identical detection rooms, at least one heat flow sensor, and a wireless data transmission device. Each detection room comprises at least one pair of temperature sensors detachably and symmetrically disposed on the inner side and the outer side of a wall or a roof. The heat flow sensor is detachably disposed adjacent to an inner temperature sensor. The wireless data transmission device is used for transmitting data of the temperature sensor and the heat flow sensor. The measuring method comprises the following steps of: mounting templates to be tested and comparison templates in different detection rooms respectively; obtaining detection point data: T template 1, q template and T template 2 or T comparison template 1, q comparison template and T comparison template 2; and calculating the equivalent thermal resistance R according to a formula. A detected value of the evaluation method on the thermal insulation performance is closer to an actual value after applying an architecture protective structure so as toprovide reliable reference data for the application and promotion of building insulation materials, especially thermal insulation coatings.

Description

technical field [0001] The invention relates to the technical field of building thermal insulation materials, in particular to a measurement system and method for equivalent thermal resistance of building thermal insulation materials. Background technique [0002] With the increasingly prominent environmental problems and the shortage of energy sources such as coal, oil and natural gas, energy problems have become an important factor restricting social and economic development. The energy consumption of the building envelope accounts for more than 50% of the total energy consumption of the building, and the heat loss of the building envelope accounts for about 70%-80% of the total energy consumption of the building. On the other hand, the building area in our country is huge, and the building area that needs to be rebuilt for thermal insulation of the envelope is also very large. It is expected that by 2020, the national housing construction area will reach 68.6 billion squ...

AI Technical Summary

Problems solved by technology

The solar reflectance and hemispherical emissivity and other indicators specified in the current standards cannot directly reflect the energy-saving effect of heat-insulating coatings; although the two methods of calculating the heat-insulating temperature difference and the hot box method are also similar to calculating the heat transfer coefficient, due to this The method of local heating may lead to uneven heat transfer, which is quite different from the actual external environment, and there is a large error between the test result and the actual situation.

Moreover, a single thermal conductivity and heat transfer coefficient cannot fully reflect the thermal performance of the building envelope.

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