Building Physics - Heat, Air and Moisture: Fundamentals and by Hugo S. L. C. Hens

By Hugo S. L. C. Hens

Undesirable stories with development caliber, the strength crises of 1973 and 1979, proceedings approximately "sick buildings", thermal, acoustical, visible and olfactory ache, the circulation in the direction of extra sustainability, have all speeded up the advance of a box, which till 35 years in the past used to be rarely greater than a tutorial workout: development physics.

Through the applying of latest actual wisdom and the mix with details coming from different disciplines, the sphere is helping to appreciate the actual functionality of creating elements, constructions and the outfitted surroundings, and interprets it into right layout and construction.

This booklet is the results of thirty years instructing, learn and consultancy job of the writer. The publication discusses the idea at the back of the warmth and mass delivery in and during development elements. regular and non-steady kingdom warmth conduction, warmth convection and thermal radiation are mentioned intensive, by way of normal building-related thermal options equivalent to reference temperatures, floor movie coefficients, the thermal transmissivity, the sun transmissivity, thermal bridging and the periodic thermal homes. Water vapour and water vapour move and moisture circulation in and during development fabrics and development elements is analyzed intensive, combined up with numerous engineering recommendations which enable a primary order research of phenomena akin to the vapour stability, the mildew, mould and dirt mites danger, floor condensation, sorption, capillary suction, rain absorption and drying. In a final part, warmth and mass move are mixed into one total version staying closest to the genuine hygrothermal reaction of creating elements, as saw in box experiments.

The booklet combines the speculation of warmth and mass move with regular development engineering functions. the road from thought to software is wearing an accurate and transparent means. within the thought, oversimplification is kept away from.

Show description

Read Online or Download Building Physics - Heat, Air and Moisture: Fundamentals and Engineering Methods with Examples and Exercises PDF

Best technology books

The Infrared & Electro-Optical Systems Handbook. Atmospheric Propagation of Radiation

This eight-volume set provides cutting-edge details on infrared and electro-optical structures. The guide has been revised, and lines forty five chapters written through eighty specialists in IR/EO expertise. matters addressed comprise passive EO structures and atmospheric propagation of radiation.

Technology Innovations for Behavioral Education

Know-how concepts for Behavioral EducationMary Gregerson, editorEvolving along technological advances is a brand new iteration of tech-savvy, media-attuned scholars, quite in graduate and clinical courses. yet whereas a lot is being made from a growing to be electronic divide among academics and freshmen, creative teachers are utilizing the recent digital media to layout academic concepts which are inventive and functional, enticing and powerful.

Technischer Lehrgang Stoßdämpfer (German Edition)

Dieser Technische Lehrgang erklärt Theorie und Funktionsprinzip des Stoßdämpfers. Er zeigt die praktische Anwendung und erklärt die verschiedenen Bauarten. Beschreibungen zu Stoßdämpfertest und Fehlererkennung komplettieren die Darstellung.

Extra info for Building Physics - Heat, Air and Moisture: Fundamentals and Engineering Methods with Examples and Exercises

Sample text

7. Uniform steady state heat source and heat sink in a single-layered wall: temperature lines. with as boundary conditions: x = 0: T = Ts1; x = d: T = Ts2 (Ts1 < Ts2). e. a parabolic temperature curve. 22) Opposite to the case with no heat dissipation, now the heat ƀow rate changes from point to point in the wall. The boundary conditions give as the value for the integration constants: C1 = θs2 − θs1 Φ d ′ + , C2 = θs1 2λ d Composite Wall with Local Heat Source or Sink If condensate is deposited in the interface between two layers in a wall, heat of evapouration is released there.

16) Rs1x with the thermal resistance between surface s1 and the interface x in the wall. 16) becomes: θ x = θs2 − q Rs2x . In the [R, T] coordinate system (abscissa R, ordinate T, further called the [R, T]-plane or [R, T]-graph), both relations represent a straight line through the points (0, Ts1) and (R, Ts2) with the heat ƀow rate q as the slope. Or, in a [R, T]-plane, a composite wall behaves as a single-layered wall. Consequently, the graphical construction of the temperature line is an easy job.

Graphical construction of the temperature line in a composite wall. 6). 18) with λ (θm ) the thermal conductivity at the average temperature in the single-layered wall. The thermal resistance becomes d / λ (θm ). As a temperature curve we obtain a parabola of the form a θ2 / 2 + λ 0 θ = q x + C . 6. Wet wall, moisture profile turns thermal conductivity into a function of the ordinate x. 19) As for a wall with constant thermal conductivity, the denominator represents thermal resistance. 20) Single-layered Wall with Heat Source or Sink Spread Over the Thickness In building parts, processes may take place that dissipate heat.

Download PDF sample

Rated 4.48 of 5 – based on 11 votes