Shaping the Energy Efficiency in New Buildings - Building Energy ...

Figure 6 Maximum U-factors in Residential Walls by Climate Zone 44Note: Climate zone 1 is hot, climate zone 2 is warm, 3 is cool and 4 is very cold. See Table 9 for detaileddescriptions of these zones.3.4 HVACKey Findings All APP countries have an HVAC section in their building energy codes. For HVAC equipment, most countries refer to other equipment standards and/orpresent energy performance standards in their HVAC section. China, Japan and South Korea address natural ventilation in their building energycodes.HVAC refers to heating, ventilation and air conditioning equipment and systems inbuildings and houses. As the most important mechanical component of a building, HVACcontributes to a major share of building energy use; hence, it is covered by all buildingenergy codes in APP countries.Three sections in BCA 2007 (Australia) cover HVAC including 1) building sealing (suchas chimneys and flues, windows and doors, exhaust fans and others), 2) air movement(such as ventilation openings) and 3) air conditioning and ventilation systems (such asequipment efficiency).Building energy codes in Canada, China, India and the United States (ASHRAE 90.1–2007) provide both mandatory and prescriptive provisions on HVAC (Table 15).44 The maximum U-factor for residential walls in South Korea (0.47 W/m2·K) is cited in RBFCO.46