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Estimation Energy and Water Losses in Residential Hot Water Distribution Systems.

DE2005861252

Publication Date	2005
Personal Author	Lutz, J.
Page Count	12
Abstract	Residential single family building practice currently ignores the losses of energy and water caused by the poor design of hot water systems. These losses include; the waste of water while waiting for hot water to get to the point of use; the wasted heat as water cools down in the distribution system after a draw; and the energy needed to reheat water that was already heated once before. Average losses of water are estimated to be 6.35 gallons (24.0 L) per day. (This is water that is run down the drain without being used while waiting for hot water.) The amount of wasted hot water has been calculated to be 10.9 gallons (41.3 L) per day. (This is water that was heated, but either is not used or is used after it has cooled off.) A check on the reasonableness of this estimate is made by showing that total residential hot water use averages about 52.6 gallons (199 L) per day. This indicates about 20% of average daily hot water is wasted.
Keywords	Hot water systems Energy loss Water loss Residential buildings Energy consumption Energy efficiency
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Berkeley National Lab., CA. Environmental Energy Technologies Div.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200612

Estimation Energy and Water Losses in Residential Hot Water Distribution Systems.

Estimation Energy and Water Losses in Residential Hot Water Distribution Systems.
DE2005861252

Publication Date	2005
Personal Author	Lutz, J.
Page Count	12
Abstract	Residential single family building practice currently ignores the losses of energy and water caused by the poor design of hot water systems. These losses include; the waste of water while waiting for hot water to get to the point of use; the wasted heat as water cools down in the distribution system after a draw; and the energy needed to reheat water that was already heated once before. Average losses of water are estimated to be 6.35 gallons (24.0 L) per day. (This is water that is run down the drain without being used while waiting for hot water.) The amount of wasted hot water has been calculated to be 10.9 gallons (41.3 L) per day. (This is water that was heated, but either is not used or is used after it has cooled off.) A check on the reasonableness of this estimate is made by showing that total residential hot water use averages about 52.6 gallons (199 L) per day. This indicates about 20% of average daily hot water is wasted.
Keywords	Hot water systems Energy loss Water loss Residential buildings Energy consumption Energy efficiency
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Berkeley National Lab., CA. Environmental Energy Technologies Div.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200612