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A method for testing the dynamic heat transfer process of building walls

A technology of dynamic heat transfer and process testing, applied in the direction of material thermal development, etc., can solve the problems of inability to detect the thermal performance of the wall, limited testing conditions, and steady-state heat transfer process.

Active Publication Date: 2019-04-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: the existing technology discloses a simple structure and wide applicability on-site detection device for the heat transfer coefficient of the enclosure structure, which can improve the temperature uniformity and stability of the measured part, but the detection conditions are limited to the steady-state heat transfer process. Unable to test the thermal performance of the wall in a dynamic thermal environment

Method used

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  • A method for testing the dynamic heat transfer process of building walls
  • A method for testing the dynamic heat transfer process of building walls
  • A method for testing the dynamic heat transfer process of building walls

Examples

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Embodiment 1

[0072] This embodiment discloses a test method for the steady-state heat transfer process of a building wall, and the specific test process is as follows:

[0073] 1 Preparation before the test. The wall test piece 2 is made on site, and it is fixed between the hot and cold boxes by using the clamping device 12 to conduct the wall heat transfer test. The user inputs the temperature constant value T of the cold box 5 in the computer client 15 c , metering hot box 4 and protective hot box 3 temperature constant value T h [and T h -T c ≥20℃], as a steady state heat transfer test condition.

[0074] 2) Heat transfer process test. After the user inputs the test working condition, the working condition data is imported to the temperature control intelligent instrument monitoring system 13 through the data transmission line 16, which controls the environmental conditions in the hot and cold boxes on both sides of the wall specimen 2. During the steady-state heat transfer test, ...

Embodiment 2

[0080] This embodiment discloses a test method for the dynamic heat transfer process of a building wall, and the specific test process is as follows:

[0081] 1) Preparation before the test. The wall test piece 2 is made on site, and it is fixed between the hot and cold boxes by using the clamping device 12 to conduct the wall heat transfer test. The user inputs the temperature dynamic setting data set of the cold box 5 in the computer client 15 Metering hot box 4 and protective hot box 3 temperature dynamic setting data set Set the time interval of working condition change as Δτ, and the test time as τ, so the test process is divided into n=τ / Δτ time periods on average. data set and The expression of is as follows:

[0082]

[0083]

[0084] In the formula, is the average temperature of the air in the cold box at the time point iΔτ; is the average temperature of the metering hot box and the protective hot box at the time point iΔτ.

[0085] 2) Heat transfe...

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Abstract

The invention discloses a device and method for testing the dynamic heat transfer process of a building wall. The device comprises a box system, a computer and an instrument monitoring system. The box system is used for testing the dynamic and steady-state heat transfer process of the wall according to test working conditions input by users; the computer and the instrument monitoring system are used for testing the setting of the working conditions, achieving control over the wall heat transfer process, collecting data such as temperature, heat flow and electric heating power in the heat transfer process in real time, intelligently analyzing the wall heat transfer process and thermal performances according to preset calculation rules, and automatically generating a heat transfer process analysis table. Not only can a function of detecting a wall heat transfer coefficient in the steady-state heat transfer process be achieved, but also the dynamic wall heat transfer process in different cities and building environments of different types can be simulated and tested, the wall thermal performance and the heat transfer process thereof are analyzed intelligently, different wall structures are provided for different indoor environment regulating demand, and the theoretical basis is provided for formulating relevant standards.

Description

technical field [0001] The invention belongs to the technical field of testing the thermal performance of building walls, in particular to a heat transfer testing system. Background technique [0002] At present, China is in a critical period of accelerating industrialization, urbanization, and new rural construction. Construction, industry, and transportation have become the three major industries of energy use, and are also important sources of greenhouse gas emissions. In 2009, my country's building energy consumption reached 717 million tons of standard coal, accounting for 23.39% of the total energy consumption of the whole society. According to the conventional development mode of developed countries, the proportion of my country's building energy consumption in the total energy consumption can reach 35%. Since the energy saving of building enclosure structures can reach about 25%, the state has successively promulgated many energy-saving design standards for public bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 丁勇李百战高亚锋史丽莎续璐沈舒伟谢源源
Owner CHONGQING UNIV
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