Practical and Effective Approaches to Residential Ventilation for Production Builders
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1 Practical and Effective Approaches to Residential Ventilation for Production Builders by Armin Rudd USDOE Building America Program for Affordable Comfort Conference 2002 Cincinnati, Ohio 18 April 2002 Building Science Corporation PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 1 of 25
2 Durability can be insured with respect to moisture by: Providing a building envelope design that can dry should it get wet Preventing excessive pressurization and depressurization of occupied spaces and cavities Installing controlled mechanical ventilation systems, and dehumidification separate from cooling for humid climates April 2002 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 2 of 25
3 Purposes of mechanical ventilation 1. Point-source ventilation - Remove Pollutants exhaust fans: kitchen, bath, laundry 2. Whole-building ventilation - Dilute Pollutants supply, exhaust, or balanced fans distributing to all rooms PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 3 of 25
4 Climate Specific Design Solutions April 2002 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 4 of 25
5 Intermittent Operation Sizing Intermittent flow is determined by the constant flow requirement, the fan duty cycle fraction, and a low-level of background infiltration when the blower is not on. Note: Regardless of the size of the house, the intermittent flow is never sized less than the constant flow requirement. Q& in = ( & I Qco) ( V ( 1 f )) 60 f PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 5 of 25
6 Outside air flow rate and duct sizing for central-fan fan-integrated supply ventilation systems for BSC Building America homes Heating/cooling season fan duty cycle 0.33 Ventilation cfm per bedroom 10 Base infiltration when not ventilating (ach) 0.07 Wall height OA flow OA Duct size OA Duct Pressure Number of bedrooms Floor area (ft) needed (cfm) (inch) (Pa) (Inch H2O) Wall height OA flow OA Duct size OA Duct Pressure Number of bedrooms Floor area (ft) needed (cfm) (inch) (Pa) (Inch H2O) April 2002 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 6 of 25
7 Interior closet or basement configuration Thermostat Fan Cycling Control Control Wiring Terminals Central System Supply Air Central System Return Air Exterior Wall Wall Cap with Insect Screen Heating Apparatus 6" Insulated Outside Air Duct (slope up for first 4') Ventilation Air Intake (locate away from pollutant sources) Air Distribution Fan Air Handler Unit Cooling Apparatus Field measurement of outside air duct pressure, used to set balancing damper position Filter/Air Cleaner Register box adapted with slide-in filter Balancing Damper PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 7 of 25
8 Interior mechanical closet Thermostat Fan Cycling and Motorized Damper Control Central System Supply Air Control Wiring Terminals Exterior Wall Wall Cap with Insect Screen Air Distribution Fan Air Handler Unit Heating Apparatus Cooling Apparatus 6" Insulated Outside Air Duct (slope up for first 4' in snow country) Motorized Damper (optional) Interior Wall Ventilation Air Intake (locate away from pollutant sources) Return air plenum Filter grille assembly with 1" cloth pleated filter Filter Manual Damper Central System Return Air Floor PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 8 of 25
9 Unvented-cathedralized attic configuration Gable end intake Gable End Wall Thermostat Fan Cycling Control Outside Air Duct 6" Insulated Flex-duct Main Return Duct Wall Cap Central System Supply Air Heating Coil Cooling Coil Gypsum Ceiling Central Return Box Return Grille and Filter "Hog-Hair"-type Filter (held by Z- clips) PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 9 of 25
10 Outside air duct (filtered) connected to return filter grille box return duct ceiling filter grille box OA duct and filter April 2002 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 10 of 25
11 Outside air duct (filtered) connected to return filter grille box return duct Outside air duct April 2002 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 11 of 25
12 Unvented-cathedralized attic configuration Side-wall intake Thermostat Fan Cycling Control Main Return Duct Central System Supply Air Heating Coil Cooling Coil Outside Air Duct 6" Insulated Flex-duct Roof Gypsum Ceiling Central Return Box Wall Cap Return Grille and Filter "Hog-Hair"-type Filter (held by Z clips) Fur-down In Closet Or Garage At Exterior Wall PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 12 of 25
13 Unvented-cathedralized attic configuration Extended collar (gives more air flow) Gable End Wall Fan Cycling Control Main Return Duct Wall Cap Central System Supply Air Heating Coil Thermostat Cooling Coil Extended Collar Gypsum Ceiling Central Return Box Return Grille and Filter Metal Clips to hold filter Outside Air Filter ("Hog-Hair" type) Outside Air Duct 5" Insulated Flex-duct Manual Damper (to adjust flow rate) PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 13 of 25
14 Outside air duct (filtered) connected to extended collar at return filter grille box extended collar OA duct April 2002 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 14 of 25
15 Outside air duct (filtered) connected to extended collar at return filter grille box extended collar OA duct April 2002 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 15 of 25
16 Unvented-cathedralized attic configuration With motorized damper and damper cycling control Central System Supply Air Heating Coil Thermostat Gable End Wall Fan Cycling Control Cooling Coil Main Return Duct Motorized Damper (to control open time) Wall Cap Extended Collar Gypsum Ceiling Central Return Box Return Grille and Filter Metal Clips to hold filter Outside Air Filter ("Hog-Hair" type) Outside Air Duct 5" Insulated Flex-duct Manual Damper (to adjust flow rate) PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 16 of 25
17 Outside air duct with motorized damper Motorized outside air damper (normally closed) April 2002 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 17 of 25
18 Unvented-cathedralized attic configuration Media filter and motorized damper Fan Cycling and Motorized Damper Cycling Control Central System Supply Air Heating Coil Cooling Coil Thermostat Gable End Wall Manual Damper (to adjust flow rate) Wall Cap Motorized Damper (to control open time) Outside Air Duct 5" Insulated Flex-duct Media Filter Main Return Duct Gypsum Ceiling Central Return Box Return Grille PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 18 of 25
19 With dehumidification separate from cooling Hot-humid climate, interior mechanical closet configuration Thermostat Fan Cycling and Motorized Damper Cycing Control Central System Supply Air Control Wiring Terminals Exterior Wall Wall Cap with Insect Screen Central Fan Air Handler Unit Heating Apparatus Cooling Apparatus Filter 6" Insulated Outside Air Duct Motorized Damper (to control open time) Ventilation Air Intake (locate away from pollutant sources) Duct extension at air handler return (open at bottom) Central System Return Air Remote Dehumidistat (optional) 40 pint/day dehumidifier Manual Damper (to adjust flow rate) Floor PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 19 of 25
20 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 20 of 25
21 Monitored Runtime Data Centennial Crossing, Lot 22 Fan Recycling Cool ON Heat ON Vent ON Cost (%) (%) (%) ($) Apr (27-30) May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar (1-9) Notes: Fan recycling control set for 25 min OFF, 6 min ON (19% duty cycle) PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 21 of 25
22 Monitored Runtime Data Centennial Crossing, Lot 176 Fan Recycling Cool ON Heat ON Vent ON Cost (%) (%) (%) ($) Aug Sep Oct Nov Dec Jan Feb Notes: Fan recycling control set for 20 min OFF, 8 min ON (29% duty cycle) PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 22 of 25
23 Monitored Runtime Data Centennial Crossing, Lot 179 Fan Recycling Cool ON Heat ON Vent ON Cost (%) (%) (%) ($) Oct Nov Dec Jan Feb Mar (1-8) Notes: Fan recycling control set for 20 OFF 10 ON (33% duty cycle) PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 23 of 25
24 Minneapolis ventilation study shows importance of distribution and mixing between rooms 0.5 Air Changes Per Hour (1/h) Test ID Number PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 24 of 25
25 Lot 6 Arbor View 6 Indoor temperature variation from the house average Temperature Variation (F) max min avg -6 Return Storage Mbed Hall Great Building Science Corporation Dining Bed 2 PR-0204: Practical and Effective Approaches to Residential Ventilation for Production Builders Page 25 of 25
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