Systems Coupled with a Variety of Mechanical Systems on Annual - - PowerPoint PPT Presentation
The Impacts of Code Compliant Ventilation Systems Coupled with a Variety of Mechanical Systems on Annual Heating Energy Performance in a Vancouver Residential House through EnergyPlus Model ANDREW YANG, M. ENG. BRITISH COLUMBIA INSTITUTE OF
ANDREW YANG, M. ENG. BRITISH COLUMBIA INSTITUTE OF TECHNOLOGY
Change in BC Building Code Stringent building envelope requirement Importance of quality ventilation
Energy Use by Sector Dwelling Types in Canada End-Use Energy Consumption
To study acceptable ventilation system’s heating energy use To analyze heating energy use for different systems through energy model To identify energy saving potential and potential improvements
2-Storey and a basement Area / volume: 2,388 ft2 / 20,872 ft3 Window-to-wall ratio: 9% Windows: 0.35 U-Value & 0.32 SHGC Air leakage rate: 2.5 ACH50 Ventilation rate: 60 cfm
Electric Baseboard (Exhaust-only ventilation) Electric Baseboard (Balanced ventilation) Electric Baseboard (with HRV) Furnace Furnace (with HRV)
Electric Baseboard (Exhaust-only ventilation) Electric Baseboard (Balanced ventilation) Electric Baseboard (with HRV) Furnace Furnace (with HRV)
Electric Baseboard (Exhaust-only ventilation) Electric Baseboard (Balanced ventilation) Electric Baseboard (with HRV) Furnace Furnace (with HRV)
Electric Baseboard (Exhaust-only ventilation) Electric Baseboard (Balanced ventilation) Electric Baseboard (with HRV) Furnace Furnace (with HRV)
Electric Baseboard (Exhaust-only ventilation) Electric Baseboard (Balanced ventilation) Electric Baseboard (with HRV) Furnace Furnace (with HRV)
Transfers Heat from Exhaust Air to Fresh Air
Supply Fan
Heat Exchanger Core
Exhaust Fan
Design Heating Load Equipment sizing based on the design heating load
Base Systems Design Heating Load Ventilation Load Without HRV 25,420 Btu/h 2,611 Btu/h With HRV 23,540 Btu/h 731 Btu/h Equipment Specifications Electric Baseboard Meets zone level loads Furnace 2.5 Ton (30,000 Btu/h) / 800 cfm HRV 79 cfm / 72% sensible efficiency
36,507 36,679 27,498 37,991 30,141
15000 20000 25000 30000 35000 40000
Annual Heating Energy Consumption [in kBtu]
Baseboard Exhaust Baseboard Balanced Ventilation Baseboard HRV Furnace Furnace with HRV
10,699 kWh 10,750 kWh 8,059 kWh 1,285 kWh 35.5 GJ 1,760 kWh 25.5 GJ
+51 kWh
+475 kWh
+408 kWh
Fan Energy Heating Energy
68.00 70.00 72.00 74.00 76.00 78.00 80.00 82.00 May Jun Jul Aug Sep
Furnace (with HRV) Baseboard (with HRV) Furnace Baseboard (Balanced) Baseboard (Exhaust)
50 55 60 65 70 75 80 85 May Jun Jul Aug Sep
[°C]
HRV saved about 28% for the hypothetical house Saving percentage is closely related to envelope performance Summer overheating phenomena to be addressed Mechanical design to avoid unnecessary blower fan continuously running