Numerical calculation of heat losses for crawl space foundation at different locations in Sweden

2018 ◽

Vol 13 (1) ◽

Author(s):

Wadie Kidess

Keyword(s):

Numerical Calculation ◽

Energy Performance ◽

Heat Losses ◽

Calculation Methods ◽

The Third ◽

Simplified Method ◽

Calculation Results ◽

Thermal Bridges ◽

Simplified Calculation ◽

Family House

In order to get the authorization for issuing energy performance certificates in Slovenia, the expert candidate has to attend the prescribed course and pass the exam. The simplified method for heat losses calculation that is taught at this course neglects the thermal bridges, raising concerns whether the calculation results are reliable. In this paper we have compared three methods for calculation of thermal losses for a “typical” family house. The first is the above mentioned simplified calculation using a correctional factor; the second takes into account the thermal bridges, using linear thermal transmittances obtained by numerical calculation, and the third takes into account the thermal bridges, using default values for linear thermal transmittances. Noting that the second method returns the most exact values, we have found that the first method results are too large, yet still smaller than the third method results.

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Research of Heat Losses of Solar Collectors and Heat Accumulators

International Journal of Energy Optimization and Engineering ◽

10.4018/ijeoe.2021070105 ◽

2021 ◽

Vol 10 (3) ◽

pp. 85-103

Author(s):

Shavkat Klychev ◽

Sagdulla A. Bakhramov ◽

Valeriy Kharchenko ◽

Vladimir Panchenko

Keyword(s):

Numerical Calculation ◽

Boundary Conditions ◽

Heat Loss ◽

Thermal Insulation ◽

Thermal Model ◽

Heat Losses ◽

Solar Collectors ◽

Insulation System ◽

Heat Accumulator ◽

Intrinsic Radiation

The article discusses the features of heat losses by convection and radiation of flat solar collectors on the basis of a non-stationary thermal model and program. The connection of heat losses with the generalized heat loss coefficient of solar collectors is shown. The article also deals with the problem of determining the distribution of temperatures and heat losses by convection and radiation of a thermal insulation system – accumulating body (water) for a spherical heat accumulator under symmetric boundary conditions. The problem is solved numerically according to the program developed on the basis of the proposed “gap method.” The method and program for the numerical calculation of heat losses and temperatures in time in a spherical two-layer heat accumulator with symmetric boundary conditions, taking into account both incident and intrinsic radiation, have been developed. The program has been developed for a “long” two-layer cylindrical heat accumulator of solar collectors.

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171. Evolving Technology: When and How to Use an Enclosed Crawl Space to Resolve a Moisture and Mold Challenge

10.3320/1.2758882 ◽

2006 ◽

Author(s):

J. Furman

Keyword(s):

Crawl Space

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Selection of the Area of Window Openings of Residential Buildings in Conditions of Monsoon Climate of the Far East of the Russian Federation and Northern Areas of China

Light & Engineering ◽

10.33383/2019-014 ◽

2019 ◽

pp. 27-33

Author(s):

Aleksei K. Solovyov ◽

Bi Guofu

Keyword(s):

Residential Buildings ◽

Russian Far East ◽

Far East ◽

Heat Losses ◽

Natural Light ◽

Monsoon Climate ◽

Northern Areas ◽

Artificial Illumination ◽

Heat Penetration ◽

Large Heat

The term “window” in architecture usually stands for an opening in a wall or roof for penetration of natural light, sunrays and fresh air in premises. Recently, the requirement of contact with environment is added to this condition. It is especially relevant for residential buildings where rooms are considered residential if they have windows. The energy consumption of a building depends on sizes, form and location of windows. In winter, windows cause huge heat losses, in summer, on the other hand, large heat enters a building via the windows and is required to be removed by means of air conditioning. Moreover, windows are used for penetration of natural light in premises, which assists in saving of large amounts of power for artificial illumination. This article discusses partial solving the problem of the energy efficiency of residential buildings by determining the most efficient area of windows in terms of energy spending for compensation of heat losses via windows in winter, elimination of heat penetration through them in summer and energy losses for artificial lighting throughout the year. The analysis of the results of calculation of power consumption for residential premises in conditions of monsoon climate of the Russian Far East and Northern areas of China (PRC) is provided.

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Daylight in Underground Spaces

Light & Engineering ◽

10.33383/2017-028 ◽

2018 ◽

pp. 156-161

Author(s):

Alexei K. Solovyov

Keyword(s):

Light Guide ◽

Heat Losses ◽

Internal Environment ◽

Method Of Calculation ◽

Natural Lighting ◽

Different Depths ◽

The Common ◽

Different Diameters

Underground spaces in town centres present a big attraction for investors. However, they put special requirements to the internal environment. Those requirements can be fulfilled by means of daylighting. Examples of lighting of underground spaces are discussed. It is shown that the common systems of natural lighting are not always possible to use and cause big heat losses. Hollow light guide pipes allow avoid the shortcomings of common daylight systems. Method of calculation of daylight factors from hollow light guide pipes is shown. The results of calculation of daylight factors under the light guide pipes of different diameters in the different depths are presented.

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