By Ali Vedavarz
With over 1,000 pages protecting all primary and sensible HVAC layout tactics and strategies, this vintage reference is choked with info and a wealth of knowledge that's of significant use to the HVAC fashion designer and practitioner, in addition to to the coed getting to know the intricacies of HVAC basics. in contrast to the other instruction manual of its sort, HVAC presents an in-depth therapy of issues through modular self-contained chapters that serve either as a handbook for the skilled expert and as a primary reference for others. every one self-contained bankruptcy areas emphasis on graphical and tabular displays of knowledge which are beneficial for simple figuring out of basics and fixing difficulties of layout, set up, and operation. every thing you would like is true the following in a single whole volume!
Includes software program packages
- Bell and Gossett ESP-PLUS software program offers calculations for the choice of apparatus equivalent to hydraulic pumps, warmth exchangers, and hydronic and steam procedure parts. It additionally is helping opt for commercially to be had gear and components.
- Trane Load seven-hundred heating and cooling load calculation software program permits the consumer to take advantage of certain geometric, climate and publicity parameters to correctly estimate load throughout the heating and cooling cycles.
Primarily makes use of U.S. everyday devices but additionally makes use of either SI and U.S. devices at times.
Read or Download HVAC: Heating, Ventilation & Air Conditioning Handbook for Design & Implementation PDF
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Additional info for HVAC: Heating, Ventilation & Air Conditioning Handbook for Design & Implementation
As soon as the wetted surface temperature drops below that of the surrounding atmosphere, heat begins to flow from the warmer air to the cooler surface, and the quantity of heat transferred in this manner increases with an increasing drop in temperature. On the other hand, as the surface temperature drops, the vapor pressure of the water becomes lower, and, hence, the rate of evaporation decreases. Eventually, a temperature is reached where the rate at which heat is transferred from the air to the wetted surface by convection and conduction is equal to the rate at which the wetted surface loses heat in the form of latent heat of vaporization.
2–3 PSYCHROMETRY Fig 2-1. Psychrometry apparatus for measuring wet and dry- bulb temperatures As moisture evaporates from the wetted bulb, the air surrounding the bulb becomes more humid. Therefore, in order to measure the wet-bulb temperature of the air in a given space, a continuous sample of the air must pass around the bulb. The purpose of the fan in Fig. 2-1 is to cause the air to be drawn across the wetted bulb. Conventional air velocities used are between 500 and 1000 fpm for normal size thermometer bulbs.
Lines of constant specific volume v on the psychrometric chart Tw = 70 F Td = 80 W W T w Construction of the Psychrometric Chart: The charts of Figs. 2-5, and 2-6 are slightly different organizations. The ones here should be studied before any other psychrometric chart is used. To help the reader understand these charts, examples follow. But first, simplified versions of the chart is shown in Figs. 2-4a to 2-4g. Td W The enthalpy scale is drawn obliquely on the left of the chart. Enthalpy lines inclined downward left to right.