Численный анализ влияния влажности на распространение тепла в строительных материалах
Вантажиться...
Дата
2017
ORCID
DOI
10.20998/2078-774X.2017.11.11
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
НТУ "ХПИ"
Анотація
Методом конечных разностей проведен численный расчет влияния влажности на перенос тепла в некоторых строительных материалах. Получено аналитическое выражение характерного времени прогрева до некоторой температуры образца заданной толщины, изготовленного из материала с определенными коэффициентами теплопроводности и теплоусвоения. Установлено влияние влажности на изменение с течением времени температуры прогрева внутри образца. Параметрическая серия зависимости относительного изменения температуры при различных значениях влажности в области, близкой к середине образца, может быть описана единым модифицированным полиномом.
The purpose of this research was to perform numerical simulation of nonstationary temperature fields in isotropic constructional materials with the varied moisture content and study the influence of humidity on the local and integral parameters of temperature redistribution in the specimens. The method of finite differences was used for the numerical computation of the influence of humidity on the heat transfer in some constructional materials. The analytical expression of the characteristic time required for the heating-up of the specimen of a specified thickness to a certain temperature has been derived. The specimen was made of the material with specified heat conductivity and heat absorption coefficients. The derived expression enables a considerable simplification of the procedure used for the introduction of dimensionless parameters with the reduction of errors accumulated in the course of computations. It has been established that the influence of humidity on a change in the temperature with elapse of time at different humidity values in the region near the specimen center can be described by a single modified polynomial. Specified numerical methods enable the investigation of the influence of constructional materials on the coordinate and temporal components of 1D nonstationary temperature field atthe local level. The developed software package allows for the variation both of the humidity and the specimen geometry and also the main thermophysical parameters of the specimen during the detailed analysis of the local performances of temperature field.
The purpose of this research was to perform numerical simulation of nonstationary temperature fields in isotropic constructional materials with the varied moisture content and study the influence of humidity on the local and integral parameters of temperature redistribution in the specimens. The method of finite differences was used for the numerical computation of the influence of humidity on the heat transfer in some constructional materials. The analytical expression of the characteristic time required for the heating-up of the specimen of a specified thickness to a certain temperature has been derived. The specimen was made of the material with specified heat conductivity and heat absorption coefficients. The derived expression enables a considerable simplification of the procedure used for the introduction of dimensionless parameters with the reduction of errors accumulated in the course of computations. It has been established that the influence of humidity on a change in the temperature with elapse of time at different humidity values in the region near the specimen center can be described by a single modified polynomial. Specified numerical methods enable the investigation of the influence of constructional materials on the coordinate and temporal components of 1D nonstationary temperature field atthe local level. The developed software package allows for the variation both of the humidity and the specimen geometry and also the main thermophysical parameters of the specimen during the detailed analysis of the local performances of temperature field.
Опис
Ключові слова
время прогрева, аппроксимирующий полином, расчетная сетка, теплопроводность, heating-up time, temperature, polynomial approximant
Бібліографічний опис
Писаренко А. Н. Численный анализ влияния влажности на распространение тепла в строительных материалах / А. Н. Писаренко, Л. Н. Вилинская, Г. М. Бурлак // Вісник Нац. техн. ун-ту "ХПІ" : зб. наук. пр. Сер. : Енергетичні та теплотехнічні процеси й устаткування = Bulletin of the National Technical University "KhPI" : coll. works. Ser. : Power and Heat Engineering Processes and Equipment. – Харків : НТУ "ХПІ", 2017. – № 11 (1233). – С. 68-72.