Measurement of heat transfer coefficient for doors and windows

The heat transfer coefficient detector for doors and windows is mainly implemented through the calibration hot box method (based on GB 8484 standard) or two-dimensional steady-state heat conduction software calculation (based on JGJ 151 standard). The core is to measure the heat transfer efficiency through doors and windows, and the lower the value, the better the insulation performance. A professional testing device based on the principle of stable heat transfer and using the calibration hot box method, which complies with the national standard GB/T8484-2008, is used for grading the insulation performance of doors, windows, and curtain walls in construction projects.

The insulation testing equipment for building doors and windows includes:Door and window heat transfer coefficient detectorThermal insulation performance testing equipment for building curtain walls, doors and windows, heat transfer coefficient testing instruments for building curtain walls, and heat transfer coefficient testing instruments for aluminum alloy windows

Product model: QTB

Product Overview

The wall insulation performance testing device is suitable for measuring the insulation performance of various walls, insulating glass, laminated glass, etc. It integrates the heat flow meter method, protective hot box method, and calibration

The characteristics of the hot box method. Therefore, it can be used according to specific conditions and local conditions, fully utilizing its advantages. The detection equipment consists of three parts: the box, the temperature controller, and the inspection instrument. The test specimen rack is used to place the testing material, and the rear half of the cold box contains components such as the compressor unit and temperature control. The hot box is equipped with a precision temperature controller, 12 DC, in addition to the box body

One power supply for the uniform hot air fan, and a data acquisition and processing device for inspection. The inspection instrument adopts a microcontroller system and an instrument amplifier with high stability, low drift, and low noise. At the same time, platinum resistors are used as sensing elements for the measuring bed, and various software have been developed to improve and expand its accuracy and functionality. Not only suitable for indoor inspection of enclosure structures, but also for on-site measurement of thermal performance and heat loss of enclosure structures in winter or summer.

execution standard

CB/T13475-2008 "Measurement, Calibration, and Protection of Thermal Transfer Properties in Adiabatic Steady State by Thermal Chamber Method"

GB/T10295-2008 "Determination of steady-state thermal resistance and related characteristics of insulation materials - Heat flux meter method"

　　Door and window heat transfer coefficient detectorTechnical Specifications

1. Hot box

Hot box temperature control range: ambient temperature~40 ℃, continuously controllable, air temperature fluctuation inside the box ± 0.5 ℃

The heat transfer system of the box is subjected to 5%. Power (500w)

2. Cold box

Cold box temperature control range: -10 ℃~ambient temperature. (Environmental temperature below 25 ℃)

The temperature fluctuation of the air inside the box is ≤ ± 1 ℃, and the power is 800W

3. Temperature and heat flux patrol detector

Temperature measurement range: -1000.00~+100.00 ℃

Heat flow range: 0.3~20.00m

Collection speed: 200ms/per channel

Collection accuracy: Pt1000 basic error is less than ± 0

Working environment: Temperature: -20 ℃~50 ℃, humidity: less than 90% R

Output relay contact capacity: 250VAC, 2A (resistive load)

Product Features

1. The heat flow meter shall be calibrated by a qualified third-party calibration institution before leaving the site, and calibration data shall be provided.

2. Using platinum resistors as temperature sensing elements, with high precision and good stability

3. 2-digit LED channel number display, 5-digit LED measurement value display, alarm status indicator lights for each channel

4. 3 alarm modes, 2-point common alarm relay output

5. Each input channel is equipped with surge and overvoltage protection, and unused channels can be closed at will.

6. Strict anti-interference design, suppressing fast pulse group interference and other electromagnetic interference generated by relays, contactors, etc. on site, with anti-interference ability reaching level II.

7. Automatic compensation for time drift and temperature drift.

8. Each channel independently sets a digital filtering time constant to improve display stability, and each channel independently sets zero and full-scale correction to improve system measurement accuracy. The measurement and control software can be used for both heat flow meter detection and calibration hot box detection

Overall dimensions

Qtb -10

Wall specimen size 1 × 1m thickness 0.33m

Hot box (width x height x thickness): 1.22 x 1.4 x 0.6m

Cold box (width x height x thickness): 1, 22 x 1.4 x 0.8m

Test frame (width x height x thickness): 1.22 x 1.4 x 0.33m

Qtb -15

Wall specimen size 1.5 × 1.5m, thickness 0.4m

Hot box (height x thickness): 2.14 x 2.14 x 1m

Cold box (width X height X thickness): 2.14 × 2.14 × 1m

Test frame (width x height x thickness): 2.14 x 2.14 x 0.4m