A two-port envelope model for building heat transfer

1998 ◽  
Vol 34 (1) ◽  
pp. 19-30 ◽  
Author(s):  
C. Lombard ◽  
E.H. Mathews
Keyword(s):  
Heat Transfer ◽  
Envelope Model ◽  
Building Heat

Building Heat Transfer

2004 ◽  
Author(s):  
Morris Grenfell Davies
Keyword(s):  
Heat Transfer ◽  
Building Heat

The basis for a room global temperature

1992 ◽  
Vol 339 (1653) ◽  
pp. 153-191 ◽  
Keyword(s):  
Heat Transfer ◽  
Limited Extent ◽  
Point Temperature ◽  
Heat Flows ◽  
Heating And Cooling ◽  
Radiant Exchange ◽  
Least Squares Fit ◽  
Radiant Temperature ◽  
Building Heat ◽  
Bounding Surfaces

The design of heating and cooling appliances in buildings in routine cases normally proceeds on the assumption of a room index temperature which combines the separate effects of air temperature and of the longwave radiant field m the enclosure. It is pointed out that the basis for the index in current use in the U.K. and elsewhere is flawed, and this article is concerned with the logic of setting up a valid in ex temperature in its place. The argument depends first on reducing the surface-to-surface radiant exchange between enclosure surfaces to an approximately equivalent surface-to-star point exchange, using a least-squares fit. The fit proves to be quite good. It is next established that to a limited extent the star point temperature - a fictitious construct - will do duty for the space-averaged observable radiant temperature in the room. Thirdly, since the index temperature is taken to drive the radiant and convective heat flows from the room as a whole to one of its bounding surfaces, the question is discussed as to how reliably these physically dissimilar mechanisms can be formally merged in this way. Finally, simple expressions are given for enclosure heat needs in relation to comfort temperature and similar quantities. The arguments present some innovative features in building heat transfer.

scholarly journals Evolution of regulations for thermal protection of buildings

2021 ◽  
pp. 33-44
Author(s):  
Lyubov' Vyacheslavovna Ivanova
Keyword(s):  
Heat Transfer ◽  
Thermal Protection ◽  
Thermal Engineering ◽  
Regulatory Documents ◽  
The Past ◽  
Normative Requirements ◽  
Standard Documentation ◽  
Building Heat ◽  
Resistance To Heat ◽  
Qualitative Changes

The article is devoted to the study of regulatory documents in the field of thermal engineering in construction and the development of regulations for thermal protection of buildings. The object of the research is the standard documentation in the field of thermal engineering in construction. A retrospective analysis of the norms and requirements for thermal protection of buildings was carried out by identifying qualitative changes in the content of standard documentation. Building codes and regulations, Code specification, Federal laws and Government decrees have been adopted as such regulatory documents for this study. The documents that influenced these changes are considered. The normative requirements of the past years in the field of building heat engineering have been systematized. Six stages of the formation of norms for the thermal protection of buildings are determined, based on changes in the formulas for determining the resistance to heat transfer of enclosing structures and the introduction of the characteristic of the degree-day of the heating period, depending on the climatic features of the region. Trends in the development of standards for thermal protection of buildings have been determined. The main goal is to reduce the specific characteristic of heat energy consumption for heating and ventilation, which requires a change in the requirements for thermal protection, in particular, an increase in the required resistance to heat transfer, which can contribute to updating the existing set of rules for thermal protection of buildings.

The simulation of building heat transfer for passive solar systems

1981 ◽  
Vol 3 (4) ◽  
pp. 287-294 ◽  
Author(s):  
A.F. Emery ◽  
C.J. Kippenhan ◽  
D.R. Heerwagen ◽  
G.B. Varey
Keyword(s):  
Heat Transfer ◽  
Solar Systems ◽  
Passive Solar ◽  
Building Heat

scholarly journals Designing a 24-hour perturbation method for the estimation of a building heat transfer coefficient

2021 ◽  
Vol 2069 (1) ◽  
pp. 012145
Author(s):  
S Juricic ◽  
S Rouchier ◽  
J Goffart
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Thermal Resistance ◽  
Transfer Coefficient ◽  
Perturbation Methods ◽  
Building Envelope ◽  
Estimation Errors ◽  
Performance Contracting ◽  
Building Heat ◽  
The Heat Transfer Coefficient

Abstract Verification of the actual thermal performance of a building envelope after renovation is likely to become a useful key for performance contracting in the frame of heavy retrofit operations in buildings. Some existing methods such as the co-heating method, use on-site measurements to estimate the Heat Transfer Coefficient, or its inverse the overall thermal resistance. Although reliable and accurate, they need several days to several weeks of undisturbed measurements which can be rather inconvenient for building occupants and quite expensive in terms of operational costs. This paper investigates perturbation methods to design a 24-h heat input signal that would ensure an accuracy similar to or better than other perturbation methods to estimate an overall thermal resistance of the building envelope. The paper first studies 256 different squared heating signals in a numerical methodology to determine common characteristics of high-scoring 24-h signals. An experimental campaign in a wooden-framed house tested one of the high-scoring signals. The experimental results showed estimation errors higher than expected but consistent with the literature.

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