HVAC Final Exam Correct Questions & Answers(RATED A+)

sustainability - ANSWER meeting energy needs of today's without detracting from ability of future generations to meet their needs global warming/climate change - ANSWER general rise in average annual global temperature ozone layer depletion - ANSWER loss of ozone molecules in atmosphere resulting in increase in harmful solar radiation levels Internal Load Dominated Building type (ILD) - ANSWER • Thicker, taller buildings • High internal heat gains • Inside impacts building response as much or more than outside Considerations: • Daylighting usually limited to perimeter and top floor • Heating generally only needed at perimeter during winter • Cooling required in core all year round Skin Load Dominated Building Type (SLD) - ANSWER • Tend to be thinner with most spaces having exterior exposure • Outside conditions play most significant role Considerations: • Daylighting typically easily available • Increased exterior area may result in higher heating and cooling • Can have more effective use of solar energy • Thin shape better for natural ventilation Why do we need HVAC? - ANSWER • Comfort: meets heating and cooling loads • Humidity control • Indoor air quality (IAQ) • Other building processes Primary System (Central Plant) - ANSWER • Energy conversion equipment • Provide chilled and hot water (or steam) to secondary system Secondary System - ANSWER • Comfort delivery or space conditioning equipment • Types: - Air - Air-Water - Water (Hydronic): baseboards and radiators, chilled beams - Other: fuel/wood heating, electric resistance, radiant ceiling, etc. All-Air System - ANSWER • Heating and/or cooling system that uses only conditioned air to meet thermal loads of building Air System Components - ANSWER • Duct • Fan: centrifugal, axial • Damper