SU800846A1 - Method of determining thermophysical characteristics of materials in building structures - Google Patents

Method of determining thermophysical characteristics of materials in building structures Download PDF

Info

Publication number
SU800846A1
SU800846A1 SU792743378A SU2743378A SU800846A1 SU 800846 A1 SU800846 A1 SU 800846A1 SU 792743378 A SU792743378 A SU 792743378A SU 2743378 A SU2743378 A SU 2743378A SU 800846 A1 SU800846 A1 SU 800846A1
Authority
SU
USSR - Soviet Union
Prior art keywords
thermal
kcal
materials
thermophysical characteristics
temperature
Prior art date
Application number
SU792743378A
Other languages
Russian (ru)
Inventor
Наталья Николаевна Кузнецова
Владлен Семенович Ройфе
Юрий Дмитриевич Ясин
Галина Гурьевна Лебедькова
Original Assignee
Научно-Исследовательский Институтстроительной Физики Госстроя Cccp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Научно-Исследовательский Институтстроительной Физики Госстроя Cccp filed Critical Научно-Исследовательский Институтстроительной Физики Госстроя Cccp
Priority to SU792743378A priority Critical patent/SU800846A1/en
Application granted granted Critical
Publication of SU800846A1 publication Critical patent/SU800846A1/en

Links

Description

(54) СПОСОБ ОПРЕДЕЛЕНИЯ ТЕПЛОФИЗИЧЕСКИХ(54) METHOD FOR DETERMINING THERMOPHYSICAL

Claims (2)

ХАРАКТЕРИСТИК МАТЕРИАЛОВ В СТРОИТЕЛЬНЫХ КОНСТРУКЦИЯХ Эталонное тело и исследуема  конструкци  через импульсный нагревател с датчиком температуры ввод т во .взаимное соприкосновение, образу  тепловой контакт; производ т импульс ный, нагрев} регистрируют изменение температуры во времени и одновременно измер ют диэлектрическую проницаемость материала в конструкции, по которой определ ют его объемную влаж нрсть. Затем определ ют тепловую активйость материала в конструкции по формуле где q - количество тепла, выделенное импульсным источником, ккал/м } температура импульсного источника , о врем , ч; Ьз- коэффициент тепловой активности эталонного тела, ккал/м. .Ос. Теплофизические характеристики рассчитываютс  с использованием полу ченных данных по формулам С Cojff-CaUQ ; а (Ь„/С«) Л где С , Ср и соответственно, удельные теплоемкости влажного и сухого материала , воды, ккал/кг. , - плотность сухого мате риала, Urj - весова  влжаность материала , кг/кг; и„2( - объемна  влажность ма териала, а - коэффициент температуропроводности материала , Л - коэффициент теплопроводности , ккал/м.ч.С. Предлагаемый способ может найти широкое применение в производственном контроле качества строительных изделий на предпри ти х стройиндустрии и при натурных исследовани х огражда1ацих конструкций зданий. Формула изобретени  Способ определени  теплофизических характеристик материалов в стро- . ительных конструкци х путем создани  теплового импульса и регистрации изменени  температуры в исследуемом материале с последующим вычислением коэффициентов теплопроводности и температуропроводности,о т л и ч а ющ и и с   тем, что, с целью уменьшени  погрешности определени , Одновременно с температурными измерени ми измер ют диэлектрическую проницаемость материала в конструкции, по которой определ ют его объемную влажность, затем определ ют его тепловую активность и по полученным данным расчетным путем наход т Теплофизические характеристики материала в конструкции. Источники информации, прин тые во внимание при экспертизе 1. Дмитрович А.Л. Определение теплофизических свойств строительных материалов, М., Стройиздат,1963, с. 95-108. .CHARACTERISTICS OF MATERIALS IN CONSTRUCTION STRUCTURES The reference body and the investigated structure are introduced through a pulsed heater with a temperature sensor into reciprocal contact, forming thermal contact; produce a pulse, heat} record the temperature change over time and at the same time measure the dielectric constant of the material in the structure, which determines its volumetric moisture content. Then the thermal activity of the material in the structure is determined by the formula where q is the amount of heat released by the pulsed source, kcal / m} the temperature of the pulsed source, about time, h; L3 is the coefficient of thermal activity of the reference body, kcal / m. .Os. The thermophysical characteristics are calculated using the data obtained using the C Cojff-CaUQ formulas; a (b „/ С«) L where C, Cf and, respectively, the specific heat capacities of the wet and dry material, water, kcal / kg. , is the density of the dry material, Urj is the weight content of the material, kg / kg; and „2 (- material moisture content of the material, and - material thermal diffusivity, L - heat conductivity coefficient, kcal / m.h.S. The proposed method can be widely used in the production quality control of building products at construction enterprises and in-situ studies X enclosures of buildings. Claim of the invention A method for determining the thermophysical characteristics of materials in building structures by creating a thermal impulse and recording the temperature change in the studied material. The material with the subsequent calculation of the coefficients of thermal conductivity and thermal diffusivity is about the fact that, in order to reduce the determination error, Simultaneously with the temperature measurements, the dielectric constant of the material is measured in the structure, which determines its bulk moisture then its thermal activity is determined and, using the data obtained, by calculation, the thermophysical characteristics of the material in the structure are found. Sources of information taken into account during the examination 1. Dmitrovich A.L. Determination of thermophysical properties of building materials, M., stroiizdat, 1963, p. 95-108. . 2. Авторское свидетельство СССР № 415563, кл. -G 01 N 25/18, 1972 (прототип).2. USSR author's certificate number 415563, cl. -G 01 N 25/18, 1972 (prototype).
SU792743378A 1979-03-26 1979-03-26 Method of determining thermophysical characteristics of materials in building structures SU800846A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU792743378A SU800846A1 (en) 1979-03-26 1979-03-26 Method of determining thermophysical characteristics of materials in building structures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU792743378A SU800846A1 (en) 1979-03-26 1979-03-26 Method of determining thermophysical characteristics of materials in building structures

Publications (1)

Publication Number Publication Date
SU800846A1 true SU800846A1 (en) 1981-01-30

Family

ID=20818073

Family Applications (1)

Application Number Title Priority Date Filing Date
SU792743378A SU800846A1 (en) 1979-03-26 1979-03-26 Method of determining thermophysical characteristics of materials in building structures

Country Status (1)

Country Link
SU (1) SU800846A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257532A (en) * 1992-06-29 1993-11-02 Rutgers, The State University Of New Jersey Method and apparatus for measuring moisture content as a function of thermal response
RU2789020C1 (en) * 2022-03-09 2023-01-27 федеральное государственное бюджетное образовательное учреждение высшего образования "Алтайский государственный университет" Method for indirect measurement of thermal conductivity according to the data of dielkometric measurements

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257532A (en) * 1992-06-29 1993-11-02 Rutgers, The State University Of New Jersey Method and apparatus for measuring moisture content as a function of thermal response
RU2789020C1 (en) * 2022-03-09 2023-01-27 федеральное государственное бюджетное образовательное учреждение высшего образования "Алтайский государственный университет" Method for indirect measurement of thermal conductivity according to the data of dielkometric measurements

Similar Documents

Publication Publication Date Title
Ren et al. Measuring soil water content, electrical conductivity, and thermal properties with a thermo‐time domain reflectometry probe
Parkinson A simple method for determining the boundary layer resistance in leaf cuvettes
SU800846A1 (en) Method of determining thermophysical characteristics of materials in building structures
GB1398014A (en) Device for measuring the water-vapour content of a liquid or gaseous medium
SU1107036A1 (en) Device for determination of thermo-physical parameters of construction materials
London et al. Determination of unit conductances for heat and mass transfer by the transient method
CN207600990U (en) A kind of rock specific heat capacity measurement device
SU1206667A2 (en) Arrangement for determining thermo-physical characteristics of structure materials
SU1557454A1 (en) Method of determining thickness of flat layer
SU805154A1 (en) Device for registering construction material thermophysical characteristics
SU1122956A1 (en) Method of determination of thermal physical characteristics of construction materials in structures
SU922607A1 (en) Method of structure material thermal physical characteristic determination
SU958937A1 (en) Thermal resistance determination method
SU894517A1 (en) Device for complex determination of dispersed material heat mass transfer characteristics
SU1061017A1 (en) Material thermal diffusivity determination method
RU2018117C1 (en) Method of complex determining of thermophysical properties of materials
McDade et al. Sound Velocity in Water Above 212 F
RU2788562C1 (en) Method for determining the complex of thermophysical characteristics of solid construction materials
SU873087A1 (en) Method of determination of material thermal conductivity
SU667873A1 (en) Method of determining structural-critical moisture-content of ceramics
RU2093819C1 (en) Method of nondestructive test of material heat conduction
Marshall Measurement of sap flow by heat transfer
SU433391A1 (en)
SU441500A1 (en) Porous Sheet Moisture Sensor
SU1004844A1 (en) Material thermal physical property determination method