27 2 Performance Metrics This chapter introduces the performance specifications used for the system descriptions in part two including environmental efficiency, first and operating costs as well as ease of maintenance. Each system description consists of two spreads. The first spread introduces the main characteristics of the system including ventilation, heating and cooling sources, fuel type and heat delivery medium. On the second page, a Google Maps based axonometric view shows a case study building with the particular HVAC system installed. URL links in the figure caption take the reader to an interactive 3D viewport of the building. Outside components such as air handling units, cooling towers and supply air ducts are highlighted in the axonometric view and linked to their respective descriptions in part three. A diagrammatic section of the system shows major inside and outside components and their connections. Individual components are again linked to part three. The second spread tabulates additional system specifications along with high-level pros and cons. An interior photo of the case study building reveals how the system is visually experienced by the occupants. Line diagrams below the interior photos further explains the content shown above. Specifications The specifications table lists whether or not the system has a heating and cooling system along with typical coefficient of performance ranges. Humidity control capabilities are listed with the mechanical ventilation strategy, the quantity of fresh air provided and whether or not the system can support hybrid ventilation. The system fuel type is shown as either all-electric or fossil fuel and electricity. The table also lists the climate zones in which this type of HVAC system could be applied as well as regions in which it is currently widely used and for what building programs. Fig 2.1 An MIT Department of Facilities technician inspects supply air fans in an air handling unit on the MIT Campus
RkJQdWJsaXNoZXIy MjA2MzQ5MA==