By Javad Khazaii
This ebook makes a speciality of probably the most energy-consuming HVAC structures; illuminating large possibilities for strength rate reductions in constructions that function with those platforms. the most dialogue is on, state-of-the-art selection making techniques, and algorithms in: determination making less than uncertainty, genetic algorithms, fuzzy good judgment, synthetic neural networks, agent established modeling, and video game concept. those equipment are utilized to HVAC structures, so as to support designers opt for the easiest techniques one of several to be had pathways for designing and the development of HVAC structures and functions. The dialogue extra evolves to depict how the constructions of the longer term can comprise those complicated decision-making algorithms to develop into self sustaining and really ‘smart’.
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Extra resources for Advanced Decision Making for HVAC Engineers: Creating Energy Efficient Smart Buildings
Of course depending on how we allocate this cooling load to return air and inside room air, we can calculate the final contribution of lighting load to the instant room cooling load. Similar procedures should be followed to calculate the other internal loads contributions to the building overall instantaneous cooling load. The next step naturally is to calculate the contribution of each opaque surface to the instantaneous cooling load to the building using procedure presented by RTS method. The first step is then to calculate sol-air temperature for each of the 24 h in the targeted month on each surface.
ASHRAE Fundamentals Handbook  defines the sol-air temperature as combination of the outdoor air temperature ( F) with two other factors. The first factor is an addition to the outdoor air temperature and is defined as the multiplication of absorptance of surface for solar radiation (α-dimensionless) by total solar radiation incident on surface in (Btu/h ft2) divided by coefficient of heat transfer by longwave radiation and convection at outer surface in (Btu/h ft2 F), and the second factor is a deduction from the outdoor air temperature and is defined as multiplication of hemisphere emittance of surface (ε) by difference between long-wave radiation incident on surface from sky and surrounding and radiation emitted by blackbody at outer air temperature in (Btu/h ft2) divided by coefficient of heat transfer by long-wave radiation and convection at outer surface in (Btu/h ft2 F).
From that point on, the designer will be capable of understanding and deciding what type and what size equipment should be selected to fulfill the comfort and functional criteria in the building. ASHRAE Fundamentals Handbook has been proposing and updating its recommended approaches for load calculation during the past few decades. Keywords Total equivalent temperature differential method • Sol-air temperature • Transfer function method • Conduction transfer function • Time averaging method • Room transfer function • Cooling load factor • Cooling load temperature difference • Heat balance method • Radiant time series • Base building • Design building Load Calculations In designing the HVAC system for a building the first step is always to calculate the heat gain and heat loss during cooling and heating periods.