Presentation on theme: "Chapter 8: Large Building HVAC Systems 8.1 a)Zoning b)Components Table 8.1, Fig. 8.15 (p. 454) c)Central vs. Local issues: length of distribution tree."— Presentation transcript:
Chapter 8: Large Building HVAC Systems 8.1 a)Zoning b)Components Table 8.1, Fig (p. 454) c)Central vs. Local issues: length of distribution tree difference in zoning schedule noise breakdowns maintenance Hybrid: central heat/cool, local air distribution d)Uniformity vs. Diversity How uniform does the interior environment have to be? f)Distribution trees (all air, air and water, all water) match zones to systems.
Chapter 8: Large Building HVAC Systems 8.1 h)Concealment vs. Exposure issues: noise, fire protection, aesthetics, maintenance i)Mechanical – Structural Integration issue: flexibility j)Distribution tree placement options Fig. 8.9
Chapter 8: Large Building HVAC Systems You should have a general idea of how big the components will be: Table 8.3 Approximate space sizes for major heating and cooling equipment. Table 8.4 Approximate space sizes for air-handling equipment. Table 8.7 Air handling equipment rooms Fig Fig Energy storage (p. 471) Fig The Hyndburn Borough council headquarters faces south toward a reservoir that provides an evaporatively cooled microclimate and also acts as a heat source/sink for a water-water heat pump
Chapter 8: Large Building HVAC Systems Fig The Hyndburn Borough council headquarters Daylighting, passive solar heating, photovoltaics, and a well insulated shell are featured. Termodeck is a precast hollow-core slab that stores coolth on summer nights, and precools ventilation air. The supply air then rises from the plenum created by raised floor.
Chapter 8: Large Building HVAC Systems 8.4 Air distribution within spaces b) Ceiling air supply extremely widespread solution light fixtures often fitted as supply diffusers or for return air return air especially effective as it removes heat associated with lighting beware of possible supply return short circuit
Chapter 8: Large Building HVAC Systems 8.4 Air distribution within spaces c) Underfloor supply with displacement ventilation
Chapter 8: Large Building HVAC Systems 8.4 Air distribution within spaces d) Work station delivery system Fig SC Johnson Building, Wisconsin Takes advantage of high ceilings to provide daylighting and underfloor distribution to offer personal control for each workstation. 6 foot wide lightshelf. Radiant heating units sit below the lower window. The raised floor above the structural slab forms a supply plenum fed by the main duct below the structural slab.
Chapter 8: Large Building HVAC Systems Radiant Panels with supplementary air Fig Underfloor air distribution achieved with cellular concrete air floor
Chapter 8: Large Building HVAC Systems 8.8 District heating and cooling. Carleton University? economies of scale combined with energy recovery possibilities Fuel cells (p. 521) Fig Times Square 48 story office building Façade integrated PV’s 2 fuel cells. Fed by natural gas, are expected to work for up to 5 years and provide considerable ot water as well as electricity