Cold-hot box type heat transfer coefficient detecting instrument

A heat transfer coefficient, cold and hot box-type technology, applied in the direction of material thermal conductivity, etc., can solve the problems of poor measurement accuracy, defective insulation, and inability to quantitatively measure the thermal performance of enclosure structures, so as to improve reliability and facilitate Effects of data processing and storage

Active Publication Date: 2006-08-09
北京中建建筑科学技术研究院 +1
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Problems solved by technology

At present, the technologies used for on-site inspection of energy-saving buildings at home and abroad mainly include heat flow meter method and infrared thermal imaging method. The heat flow meter method must be used to test the heat transfer coefficient of the enclosure structure on the spot, which must be carried out in the coldest month of the heating period, and each heat flow m...

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  • Cold-hot box type heat transfer coefficient detecting instrument

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Embodiment Construction

[0019] 1. Select the enclosure structure to be tested, measure the temperature distribution on the surface of the wall to be tested with an infrared thermometer, and select the part with uniform temperature distribution as the measured position. Fix the indoor wall surface temperature sensor. Close the open end of the heat box to the position to be tested. In order to achieve airtightness, a support rod should be used on the back of the heat box to hold it firmly. Confirm airtight.

[0020] 2. Fix the temperature sensor on the outdoor wall surface so that it is located in the center of the hot box and close to the wall surface. The end of the sensor is covered with tin foil to avoid direct sunlight; when the outdoor temperature is high, use a cold box to simulate the outdoor environmental conditions. The temperature inside the cold box is lower than the indoor control temperature; fix the outdoor air temperature sensor, leave the wall surface in the shadow of 10-20cm, and ins...

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Abstract

Present invention refers to Cold heat tank type heat transmission coefficient detect instrument, belonging to energy-saving site equipment for detecting building fender structure heat transmission coefficient. Detection instrument includes heat box, cold box, control apparatus, refrigerator, and heater etc. The require solved problems are 1, building fender structure site detection must be done at all seasons. 2, air temperature in heat box outer-sync with indoor air temperature makes large error of test result. Air temperature in heat box is finely controlled. 4, instrumental interference-resisting ability should be enhanced. Solution scheme is 1, adopting cold box reducing outdoor testing air temperature, 2, Adopting same error high precision temperature sensor, 3, heat box temperature control system adopting PID temperature control regulatory system and blur rule operation, adopting high-speed, high resolution AD conversion system as power consumption counting device, 4, system design adopting modular structure and separating strong and weak electricity.

Description

1. Technical field [0001] The heat transfer coefficient detection of the building envelope is an important part of the building energy saving test. The heat transfer coefficient of the envelope is measured by measuring the heat transfer per unit area of ​​the envelope and the temperature difference between the inside and outside of the heat box. The hot and cold box-type heat transfer coefficient detector uses a single-chip microcomputer to control various external input and output signals, and applies PID and digital filter technology to improve the reliability of the system. There is no need to be on duty during the detection process, and the measurement results of the whole process are automatically saved; another communication interface can upload the measurement results to the computer, which is convenient for data processing and storage. [0002] This instrument is suitable for on-site energy-saving detection of building envelope structures, and realizes the detection of...

Claims

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Application Information

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IPC IPC(8): G01N25/18
Inventor 段恺王志勇蒋志强王玉龙
Owner 北京中建建筑科学技术研究院
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