Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Rock thermophysics on-site test method under non-constant power condition

A field test, non-constant technology, used in soil material testing, measuring devices, thermal analysis of materials, etc., can solve problems such as long test cycle, unstable power, test failure, etc., to reduce test costs and reduce stability requirements , the effect of shortening the test time

Inactive Publication Date: 2012-01-04
SHANDONG JIANZHU UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method with simple method, convenient operation, which can effectively overcome power supply interruption and large voltage fluctuation in order to solve the problems of power instability in the current geotechnical thermal physical property testing process, which leads to test failure or too long test cycle. On-the-spot test method of thermal physical properties of rock and soil under non-constant power conditions due to inaccurate test

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rock thermophysics on-site test method under non-constant power condition
  • Rock thermophysics on-site test method under non-constant power condition
  • Rock thermophysics on-site test method under non-constant power condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] The method of the invention is used to test the thermal physical parameters of underground rock and soil in a construction site. In this test, the depth of the buried pipe is 100 meters, and the geological composition is: 1-3 meters is clay, and 3-100 meters is sandstone. About 24 hours after the start of the test, the heating of the tester was interrupted for about 40 minutes due to power supply. After restarting the heater, the test continued for about 4 hours, and the heating was interrupted again for about 14 hours due to power supply. Thereafter, restart the heater again, continue the test for about 6 hours, and then stop the test. The test results show that the average thermal conductivity of underground rock and soil is 3.18W / m℃, and the average volumetric specific heat is 2.59×10 6 J / m3 ℃. Figure 4 It is the comparison between the actual measurement of the change of the average temperature of the circulating water in the buried pipe with time and the average...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an onsite thermal property testing method under the condition of a non-constant power. The trend of a heating power or cooling power changing with time is analyzed under the condition of power instability such as the interruption of a power supply and large fluctuation of voltage, and by dividing the non-constant power into a plurality of sections in terms of time, wherein, the power of each section is comparatively constant (the power can be considered as zero when heating or cooling are interrupted); the heat-transfer process of buried pipes is considered to undergo a plurality of step heating flux actions which are further disintegrated into a superposition of a plurality of thermal pulses; linear superposition principle is adopted for analyzing and a mathematical model is established; and ground thermal property parameters can be obtained by integrating the mathematical model with a parameter estimation method and other methods.

Description

technical field [0001] The invention relates to an engineering field test method, in particular to a field test method for thermal physical properties of rock and soil under the condition of non-constant power. technical background [0002] Energy conservation and emission reduction is an important measure to ensure social harmony and sustainable economic development. In recent years, the Ministry of Science and Technology and the Ministry of Construction have included ground source heat pump technology using shallow ground energy as key promotional building energy-saving technology projects. The use of ground source heat pump technology in building heating and air conditioning can effectively improve the utilization rate of primary energy and reduce the greenhouse effect gas CO 2 It is a sustainable building energy-saving new technology. [0003] The measured values ​​of underground geotechnical parameters determine the number and depth of boreholes required for undergroun...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24G01N25/00
Inventor 于明志赵啸琳魏建平方肇洪
Owner SHANDONG JIANZHU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com