21 provided by the user. As shown in Fig 1.9, ASHRAE climate zones divide the world into regions with similar temperature and annual precipitation profiles (CDDI-3). Based on the foregoing natural ventilation assessment and estimated main duct sizes for minium and all air systems, users of the HVAC selector form have to decide whether their project should indeed be naturally ventilated, hybrid, minimum outdoor air or all air. According to the severity of the climate and/or a load calculation, they also need to indicate whether the building requires active heating, cooling or both. Fuel Source After selecting a ventilation system along with heating and cooling requirements, the HVAC selector form presents with a list of HVAC systems. The next key design decision concerns the fuel sources for the building. Since equipment, electric lighting, fans ducts and air-conditioning are near-universally run on electricity, this choice boils down to the heating fuel. Without carbon sequestering, burning natural gas, oil or propane prevents carbon neutrality which is why there is a push among sustainable minded design teams, clients and government agencies to "electrify all heating." A key underlying assumption is that electric grids across the world 0A, 0B Extremely hot humid/dry 1A, 1B Very hot humid/dry 2A, 2B Hot humid/dry 4A, 4B, 4C Mixed humid/dry/marine 3A, 3B, 3C Warm humid/dry/marine 5A, 5B, 5C Cool humid/dry/marine 6A, 6B, 6C Cold humid/dry/marine 7 Very cold 8 Subarctic/arctic Fig 1.9 World divided by ASHRAE climate zone classification based of TMYx 2004–2018 (Simulation: Sam Letellier-Duchesne)
RkJQdWJsaXNoZXIy MjA2MzQ5MA==