By Benjamin Stein
The entire consultant to construction technology
This finished consultant presents entire assurance of each point of the development technologist's career. It information layout and install methods, describes all appropriate apparatus and undefined, and illustrates the coaching of operating drawings and building info that meet undertaking necessities, code necessities, and criteria. the writer establishes tactics for pro box inspections and gear operations exams, presents real-world examples from either residential and nonresidential development tasks, and makes particular references to code compliance in the course of the text.
This re-creation contains alterations in construction codes, advances in fabrics and layout strategies, and the emergence of computer-aided layout (CAD), whereas conserving the logical constitution and precious particular positive factors of the 1st variation. greater than 1,100 drawings, tables, and images supplement and illustrate discussions within the textual content. subject matters lined include:
* Heating, ventilating, and air-con structures- gear and design
* Plumbing platforms- gear and design
* electric and lights structures- apparatus and design
* trying out, adjusting, and balancing approaches for all development systems
* each point of the development technologist's occupation, from the production of operating drawings via on-site supervision and structures maintenance
Extensive appendices comprise conversion components; duct layout facts; try file kinds to be used in box paintings; layout kinds and schedules for electric, HVAC, and plumbing paintings; and extra.
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Additional info for Building Technology: Mechanical and Electrical Systems, 2nd Edition
Each body radiates heat to every other body at a lower temperature. The net radiant heat gain or loss is different for each mass in the space. ture differential, the thermal absorption characteristic of the receiver (the mass at lower temperature) and the angle of exposure of the cooler mass to the warmer one. This angle is inversely proportional to the distance between them, as will be explained in detail later. The exact calculation of these factors is complex and beyond our scope here. Suffice it to say that, in still air (where convection and evaporation are minimized), radiation is the principal form of heat exchange between the human body and its environment.
In the liquid state between 32 and 212∞F, water gains or loses 1 Btu of sensible heat per pound, for each 1 F∞ of temperature change, that is, 180 Btu/lb for the 180 F∞ temperature change between 30 and 212∞F. 6 than 212∞F. Therefore, if we continue to add heat, the water will turn to steam at a temperature of 212∞F (100∞C). All the heat added after the water temperature reaches 212∞F is used to vaporize the water, that is, to change its state from liquid (water) to gas (steam). This heat is called latent heat.
Lightly clothed occupant whose average surface temperature is 78-80∞F. Further approximations in this calculation assume that all hot or cold surfaces are the same height and that occupants can be approximated by narrow vertical cylinders. In a room with a hot or cold floor, wall or ceiling, these approximations are not applicable. 6) where 2$. A is the subtended (exposure) angle between the occupant and surface A, iA is the average temperature of surface A, and so on, and The following rules of thumb are useful in designing a space where the previously stated approximations are reasonable and in evaluating the results of an MRT calculation: (1) Design the space so that wall temperatures are not more than 5 F∞ different from the air temperature and the ceiling not more than ±10 F∞ different from the air temperature.
Building Technology: Mechanical and Electrical Systems, 2nd Edition by Benjamin Stein