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Method of measuring convection heat transfer coefficient of outer surface of building

A technology of convective heat transfer coefficient and outer surface, applied in the field of building heat transfer research, to achieve the effect of simple method and high accuracy

Inactive Publication Date: 2018-08-24
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] The present invention designs a convective heat transfer coefficient measurement method and matching measuring equipment based on the naphthalene sublimation heat mass comparison experiment. The purpose is to measure the convective heat transfer coefficient of the outer surface of the building and solve the difficulties in the research of heat transfer problems in the construction field.

Method used

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  • Method of measuring convection heat transfer coefficient of outer surface of building
  • Method of measuring convection heat transfer coefficient of outer surface of building
  • Method of measuring convection heat transfer coefficient of outer surface of building

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Embodiment 1

[0029] The test element is mainly composed of naphthalene specimen, pressure sensor, temperature sensor, thermocouple and other parts. A suction cup is placed on each of the four corners behind the pressure sensor, temperature sensor, and thermocouple test element, and the element can be fixed on the window through the suction cup.

[0030] The naphthalene test piece is a square box filled with naphthalene, 15cm long and 10cm wide. The surface of naphthalene is smooth and clean, and the non-measurement time is protected by the box cover. In order to ensure the measurement accuracy, during the measurement process, it is necessary to ensure that the sublimation quality of naphthalene is above 50mg within each weighing interval. After a large number of preliminary experiments, even in the most unfavorable natural environment The quality of naphthalene sublimation can also reach this value within 30 minutes under the same conditions.

[0031] The pressure sensor is used to measur...

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Abstract

A method of measuring convection heat transfer coefficient of the outer surface of a building belongs to the technical field of coefficient measurement and is based on naphthalene sublimation and heat-mass transfer analogy experiment; a corresponding measuring apparatus is also provided; mass transfer coefficient of naphthalene under certain conditions can be obtained by measuring sublimation rateof naphthalene; convection heat transfer coefficient under these conditions is acquired via heat transfer and mass transfer analogy. The method is simple to perform and has good results accuracy.

Description

technical field [0001] The invention belongs to the technical field of building heat transfer research. Specifically, it is a method for measuring the convective heat transfer coefficient of the building exterior. This method is based on the thermal-mass analogy theory. The measurement process is simple and convenient, the measurement equipment is light and reliable, and the measurement results are highly accurate. Background technique [0002] Measuring the convective heat transfer coefficient is an indispensable part of the process of determining building energy consumption, and its size is related to many factors such as the physical state and geometric arrangement of the fluid and heat transfer surfaces. Due to the many factors affecting the convective heat transfer coefficient, the variable control is difficult, the experimental process and data processing are quite cumbersome, and its measurement has always been problematic in engineering. [0003] The traditional mea...

Claims

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Application Information

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IPC IPC(8): G01N25/20G01N25/18
CPCG01N25/18G01N25/20
Inventor 谢静超刘京刘加平陈默崔亚平
Owner BEIJING UNIV OF TECH
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