Wall Steady-State Heat Transfer Property Tester
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Description
Product Introduction:
The wall steady-state heat transfer property tester is a precision instrument specifically designed to measure the steady-state thermal properties of wall materials. By integrating advanced sensing technologies with computer-based data processing, it provides researchers, architects, and engineers with an efficient and accurate method for evaluating the thermal performance of wall materials.
Composition of the detection system and its structural dimensions:
1. Temperature Control System: Employs DC power‑regulation PID control.
The computer outputs signals that, after I/O and D/A conversion, control the corresponding actuators, enabling functions such as temperature control, data computation, temperature acquisition, printing of test reports, and display of process curves. The human–machine interface window can sequentially display the temperature value at each measurement point and includes a self‑diagnostic feature: if a temperature sensor at any point fails, the system automatically compensates for the resulting error and indicates the location of the fault, ensuring that the overall testing process continues uninterrupted.
(1) Temperature monitoring locations and quantity:
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- Internal and external surfaces of the metering box: (total of 50 points)
- Specimen (total of 18 points)
- Cold Box Space: (Total of 9 points)
- Hot box space: (9 points in total)
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Total: 86 points
(2) Arrangement and installation procedure for temperature measurement points:
a. Spatial temperature monitoring layout methodology:
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- It employs the U.S.-made DALLAS integrated digital temperature sensor.
- A diode sleeve is used as a thermal radiation shield.
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b. Layout of temperature measurement points on the specimen (or on the standard reference specimen used during calibration) and on the surface of the thermal‑cold chamber’s flow‑directing shield:
- It employs the U.S.-made DALLAS integrated digital temperature sensor.
- All probe sections are affixed to their respective test surfaces using aluminum foil adhesive tape.
c. Point‑placement procedure for the metering enclosure surface (both inner and outer surfaces of the metering enclosure wall, and both inner and outer surfaces of the metering enclosure nose cone):
- It employs the U.S.-made DALLAS integrated digital temperature sensor.
- All probe components are embedded into the surface under test, with aluminum foil adhesive tape used to seal the probe surfaces, and all lead wires routed within cable trays.
2. Electrical Cabinet
Implement the conversion between strong and weak electrical signals between the microcomputer system and the actuator.
3. Temperature Control System for the Protective Enclosure
The system comprises a compact refrigeration unit, heating compensation components, an axial fan, a gas mixer, and piping, enabling the external ambient temperature of the metering cabinet to be maintained at a constant setpoint. This ensures that heat loss through the cabinet is minimized.
4. Protective Enclosure:
The purpose of the enclosure is to shield the five walls of the metering box from the laboratory environment; by controlling the ambient temperature within the enclosure, the unbalanced heat flux inside the test specimen and the heat flux passing through the metering box walls are minimized. At the same time, the heat transfer coefficient associated with the heat flux through the metering box walls can be measured.
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- Material: Constructed from an exterior decorative panel made of “extruded polystyrene sandwich wood panels” (with a thickness of 100 mm).
- External dimensions: 1860×1860×1390 (mm)
- The main components include: a flow-directing screen, a mixing fan, a chiller, and a heater.
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5. Metering Box:
The function of the test chamber is to simulate and maintain an indoor or summer outdoor thermal environment on the hot side of the specimen. It consists of five chamber walls, a flow‑diverting screen, electric heaters, a hot‑air flow channel, internal and external surface temperature sensors, an air temperature sensor, a nose cone, and a fixture.
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- Material: Constructed from “extruded polystyrene sandwich panels” with a thickness of 100 mm.
- Internal cavity dimensions: 1100×1100×410 (mm)
- Structural features: The system adopts a split, mobile design with separate metering and protection enclosures, ensuring that both the metering enclosure and the protection enclosure are individually sealed from the specimen frame. A unique integrated structural design further guarantees reliable sealing between the metering enclosure and the specimen.
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6. Specimen frame:
The specimen frame is designed to hold the test specimen and provide external protection. Its unique temperature sensor mounting method ensures reliable thermal contact with the specimen surface, yielding more accurate temperature measurements.
The high-strength structural design enables a load-bearing capacity of up to 2 tons.
- Material: Made of wood panels with an extruded polystyrene core.
- External dimensions: 1860×1860×400 (mm)
- Opening dimensions: 1460×1460 (mm)
7. Cold Box:
The cold chamber functions to establish a stable, uniform temperature field on the opposite side of the test specimen, at a temperature lower than that in the measurement chamber, thereby maintaining a constant temperature difference across the specimen. It comprises five chamber walls, a flow‑diverting baffle, electric heaters, a cold‑air flow passage, temperature sensors, and a fixture.
- Material: Made of “extruded polystyrene sandwich panels.”
- External dimensions: 1860×1860×1170 (mm)
- Structural features:
◇ The integrated design incorporating an evaporator, air‑heating tubes, an axial fan, and a condensate‑drainage pipeline not only enhances temperature control accuracy and stability but also simplifies equipment maintenance and upkeep while saving installation space.
◇ The inner liner employs an “extruded‑polystyrene sandwich panel,” which not only enhances the unit’s aesthetic appeal but, thanks to its fully sealed construction, also addresses the longstanding issue of reduced refrigeration insulation caused by condensation and water accumulation in the cold chamber.
8. Refrigeration Unit:
Equipped with a high-quality imported 2P refrigeration compressor unit, the system can reduce the cold room temperature to –20°C. This type of refrigeration unit features multiple self-diagnostic protection functions, including overpressure, overheating, and low-temperature start-up, ensuring maintenance-free operation under any ambient conditions and enabling long-term, trouble-free continuous service.
Technical Specifications:
| Parameter item | Specific content |
| 1. Temperature control range of the metering box | 10–50°C |
| Temperature resolution | 0.0625℃ |
| Temperature control fluctuation range | 0.01–0.2℃ |
| 2. Cold Chamber Temperature Control Range | -10～22℃ |
| Temperature resolution | 0.0625℃ |
| Temperature control fluctuation range | 0.01–0.3℃ |
| 3. Temperature control range of the protective enclosure | 10–50°C |
| Temperature resolution | 0.0625℃ |
| Temperature control fluctuation range | 0.01–0.5℃ |
| 4. Temperature Difference Tracking Accuracy Between the Inside and Outside of the Measurement Cone | 0.01–0.1℃ |
| 5. Power Measurement and Control Range of the Metering Box | 0–800 W, accuracy: Class 0.5 |
| 6. Steady-state power fluctuation range of the metering box | 0.1–1W |
| 7. Test Efficiency | The total testing time for a single component is approximately 8 to 10 hours. |
| 8. Specimen dimensions | Length × Width × Height = 1450 × (≤400) × 1450 (mm) |
| 9. Equipment Overall Dimensions | Length × Width × Height = 2600 × 2160 × 2140 (mm) |
| 10. Measurement Unit Dimensions | Length × Width = 1200 × 1200 (mm); other dimensions can be customized. |
| 11. Powered version | AC 380 V, power 6 kW, three-phase five-wire system |
| 12. Applicable Venue Area | Length × Width × Height = 4000 × 5000 × 2700 (mm) |
System Software Interface:
Steady-State Heat Transfer Property Testing Software
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