2021
Up and Running with the Passive House Planning Package (9.7 IP) Module 3 | Class 1 | Domestic Hot Water
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losses
losses
Energy Demand “End Energy”
Site Energy “Final Energy”
Source Energy “Primary Energy”
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NYPH: Up and Running with PHPP
1
2021
Q: How do you calculate the total Primary (Source) Energy Demand? A: PE = ( Heating Energy
Heating Fuel Factor ) +
( Cooling Energy
Cooling Fuel Factor ) +
( DHW Energy ( Household Energy
DHW Fuel Factor ) + Household Fuel Factor(s) )
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DOMESTIC HOT WATER
NYPH: Up and Running with PHPP
2
2021
Q: How do we calculate the DHW Energy? A: DHW-Energy = Total Water Heating Energy + Distribution System Losses (piping) + Tank Losses bldgtyp | NYPH
Hot Water Energy
Note, usage volumes input are water @ 140 F Once this gets mixed down to a usable level these volumes get much larger (~double)
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NYPH: Up and Running with PHPP
3
2021
Distribution Losses: Recirculation Piping
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Distribution Losses: Branch Piping
Assumption: After a hot water draw (tap opening), ALL of the heat in the hot water which remains in the supply piping to that tap-point is ‘lost’ into the space. bldgtyp | NYPH
NYPH: Up and Running with PHPP
4
2021
Tank Losses
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Tank Losses Where do you get the heat loss rate? Use the default from the PHPP manual, or ask your certifier.
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NYPH: Up and Running with PHPP
5
2021
Plumbing Vent Stack Losses
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Plumbing Vent Stack Losses
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NYPH: Up and Running with PHPP
6