Bacon Class Presentation
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Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
location: West Eugene design conditions: DB
89 F
MDR
31 F
program: 16 person office space 4700 SF passively heated
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
zoning
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
North Elevation
South Elevation Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
total area of thermal mass : 5900 SF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
original diagrams of cooling strategy
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
original diagrams of cooling strategy
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
original diagrams of cooling strategy
cool breezes from the north
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
psychrometric chart
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
band of sun analysis
winter
summer
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - lighting
Zone A
0.5 BTU/hSF
Zone B
5.1
Zone C
5.1
Zone D
0.5
Zone E
5.1
Zone F
5.1
D
A
F
E
C
B
daylighting zones
heat gain weighted average subtotal : 2.6 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - people + equipment
office equipment
1.1 BTU/hSF
16 people
2.3 BTU/hSF
heat gain subtotal : 3.4 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - envelope
externally shaded windows
4.2 BTU/hSF
opaque walls roof
(cmu, straw bale)
0.2 BTU/hSF
(wood framed)
1.0 BTU/hSF
heat gain subtotal : 5.4 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - ventilation
ventilation for 16 people at 17 cfm/person
heat gain subtotal : 0.92 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - ventilation or infiltration
total heat gain for thermally “open” building
12.3 BTU/hSF
total heat gain for thermally “closed” building
11.4 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - cross ventilation
window inlet area 124 SF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - cross ventilation
inlet area
3%
wind velocity
7.7 mph
cross ventilation capacity = 30 BTU/hSF
open building heat gain = 12.1 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - stack ventilation
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - stack ventilation
stack height
28’
stack area (throat)
100 SF
floor area
4756 SF
stack ventilation capacity = 8 BTU/hSF
open building heat gain = 12.1 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
detailed calculations - stack ventilation
stack height
28’-9’=19’
stack area (throat)
100 SF
T in
80 F
T out
68 F
Conclusion: Stack vent works at T out < 77 F
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - cool tower
DB of 89 F MCB of 66 F exit air temp = 71 F average exit airflow = 1500 cfm
cool tower capacity = 18,000 BTU/h open building heat gain = 57,600 BTU/h
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - night flush
mass area
5900 SF
floor area
4756 SF
DB
89 F
MDR
31 F
storage capacity = 100 BTU/d SF heat gain for “closed” building: 9 hours occupied @ 12.3 BTU/d SF 15 hours unoccupied @ 1.2 BTU/d SF total heat gain @ 129 BTU/d SF Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
detailed calculations - night flush line A - mass surface area
5900 SF
line B - mass heat capacity
66,400 BTU/F
line C - floor area
4756 SF
line D - total mass cooling
795,700 BTU
line E - final mass temperature
70 F
line F - n/a
-----------
line G - total cooling
795,700 BTU
line H - total heat gain
635,200 BTU
line I - air flow required for flush
6 ACH
Total cooling capacity exceeds total heat gain - NIGHT FLUSH WORKS Night flush of thermal mass works from 9 pm till 9 am
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
conclusion
for outside temperatures below 77 F use stack ventilation when outside temperatures exceed 77 F employ night flush
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
location: West Eugene design conditions: DB
89 F
MDR
31 F
program: 16 person office space 4700 SF passively heated
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
zoning
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
North Elevation
South Elevation Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
total area of thermal mass : 5900 SF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
original diagrams of cooling strategy
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
original diagrams of cooling strategy
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
original diagrams of cooling strategy
cool breezes from the north
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
psychrometric chart
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
band of sun analysis
winter
summer
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - lighting
Zone A
0.5 BTU/hSF
Zone B
5.1
Zone C
5.1
Zone D
0.5
Zone E
5.1
Zone F
5.1
D
A
F
E
C
B
daylighting zones
heat gain weighted average subtotal : 2.6 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - people + equipment
office equipment
1.1 BTU/hSF
16 people
2.3 BTU/hSF
heat gain subtotal : 3.4 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - envelope
externally shaded windows
4.2 BTU/hSF
opaque walls roof
(cmu, straw bale)
0.2 BTU/hSF
(wood framed)
1.0 BTU/hSF
heat gain subtotal : 5.4 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - ventilation
ventilation for 16 people at 17 cfm/person
heat gain subtotal : 0.92 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
heat gain - ventilation or infiltration
total heat gain for thermally “open” building
12.3 BTU/hSF
total heat gain for thermally “closed” building
11.4 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - cross ventilation
window inlet area 124 SF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - cross ventilation
inlet area
3%
wind velocity
7.7 mph
cross ventilation capacity = 30 BTU/hSF
open building heat gain = 12.1 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - stack ventilation
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - stack ventilation
stack height
28’
stack area (throat)
100 SF
floor area
4756 SF
stack ventilation capacity = 8 BTU/hSF
open building heat gain = 12.1 BTU/hSF
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
detailed calculations - stack ventilation
stack height
28’-9’=19’
stack area (throat)
100 SF
T in
80 F
T out
68 F
Conclusion: Stack vent works at T out < 77 F
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - cool tower
DB of 89 F MCB of 66 F exit air temp = 71 F average exit airflow = 1500 cfm
cool tower capacity = 18,000 BTU/h open building heat gain = 57,600 BTU/h
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
rule of thumb - night flush
mass area
5900 SF
floor area
4756 SF
DB
89 F
MDR
31 F
storage capacity = 100 BTU/d SF heat gain for “closed” building: 9 hours occupied @ 12.3 BTU/d SF 15 hours unoccupied @ 1.2 BTU/d SF total heat gain @ 129 BTU/d SF Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
detailed calculations - night flush line A - mass surface area
5900 SF
line B - mass heat capacity
66,400 BTU/F
line C - floor area
4756 SF
line D - total mass cooling
795,700 BTU
line E - final mass temperature
70 F
line F - n/a
-----------
line G - total cooling
795,700 BTU
line H - total heat gain
635,200 BTU
line I - air flow required for flush
6 ACH
Total cooling capacity exceeds total heat gain - NIGHT FLUSH WORKS Night flush of thermal mass works from 9 pm till 9 am
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
conclusion
for outside temperatures below 77 F use stack ventilation when outside temperatures exceed 77 F employ night flush
Passive Cooling - Redesign of the West Eugene Wetlands Resident Staff Building - Tracy Bacon
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