The heat-shielding properties of three-layer external walls insulated with monolithic foam concrete are considered in the article. The temperature is given in rooms operated in intermitt ent heating conditions. An optimal exterior wall design is proposed using monolithic foam concrete for the construction of country cott ages. For this design, the results of heat engineering calculations are presented using the analytical dependence of determining the heat transfer resistance, which ensures the minimum warm-up time of the wall. The results of the calculation are presented in tabular form for a given heating time and density of foam concrete. Also a relationship is described to determine the maximum allowable resistance to heat transfer of the outer wall at diff erent densities of monolithic foam concrete.
Abstract. This paper focuses on energy consumption for heating single layer building envelopes, used in conditions of intermittent heating in different physical and mechanical and thermophysical parameters of construction materials. The authors investigated several variants of singlelayer building envelopes, used frequently in building practice, with different density and coefficients of building materials thermal conductivity. For each variant of a building envelope heat leakage and time spent on heating were calculated. Heating time was calculated by both exact and approximate analytical method. Then the researchers draw a graphic dependence of energy consumption on the density of the material taking this computational data as a basis. Further analysis showed that building envelopes made of lightweight aggregate concrete and porous concrete were the most energy efficient.
This article presents the results of a theoretical study of the impact of the density of monolithic expanded clay concrete on the specific energy consumption in the operation of the cottage building in conditions of intermittent heating. In view of the fact that the outer walls are made in the form of well masonry of various materials, in order to simplify the solution of the problem, averaging of their main thermal characteristics is made. In determining the effect of heating the outer wall and the specific energy used the author's approximate analytical method, convenient for engineering calculations. The study showed that the use no-fine expanded-clay lightweight concrete significantly reduces the specific energy consumption compared to conventional large-porous expanded clay. The lowest energy consumption according to the calculation results refers to the minimum density of sandless no-fine expanded-clay lightweight concrete, equal to 300 kg/m3.
As part of the implementation of programs for the resettlement of dilapidated housing and rural construction, special attention is paid to the construction of low rise energy efficient buildings. Analysis of various technologies for the construction of low rise buildings revealed the feasibility of using expanded clay concrete as a structural and insulating material in three layer exterior walls and well laying. The presented heat engineering calculation of the original construction of the well masonry showed rather high values of the reduced heat transfer resistance and the coefficient of heat engineering uniformity. Rather high accuracy of the presented engineering technique of thermal engineering calculation is confirmed by comparison of the received data on resistance to heat transfer of an external wall by the approximate analytical method with data of computer simulation of temperature fields by a finite element method.
This article considers the features of the use of monolithic foam concrete as a heat-insulating layer in the building enveloping structures of buildings operated under intermitt ent heating conditions. To assess the eff ectiveness of the use of monolithic foam concrete in building enveloping structures, a thermal engineering calculation of the outer wall, insulated with the use of monolithic foam concrete, was carried out. Based on the calculations carried out by the authors, graphs of the dependence of the heating time of multilayered enclosing structures on the thickness of the heat-insulating layer and the reduced resistance to heat transfer of the structure were obtained. The optimum range of thicknesses and densities of monolithic foam concrete for thermal insulation of external walls of buildings, operated in conditions of intermitt ent heating, is off ered. This calculation also showed that the use of foam concrete as a heater from the inside of the outer wall can reduce the load on the foundation of the building.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.