Hot-h2o-ked - Revision history

Branska at 23:53, 18 July 2006

2006-07-18T23:53:57Z

← Older revision		Revision as of 23:53, 18 July 2006
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	<b>Questions that still need to be resolved</b>		<b>Questions that still need to be resolved</b>
	*How many showers/loads or laundry/meals etc. are there at Miller/day?
	*What is the daily peak hot water use?		*What is the daily peak hot water use?
	*Can the current water heater accomidate the peak use (i.e. is all hot water used fully heated)?		*Can the current water heater accomidate the peak use (i.e. is all hot water used fully heated)?
	*How much energy is needed to provide the averge daily hot water used?
	**Ehren has found two websites that will help answer this question:		**Ehren has found two websites that will help answer this question:
	http://home.inu.net/davidstua/wh_cal.htm and		http://home.inu.net/davidstua/wh_cal.htm and

Branska at 22:03, 15 July 2006

2006-07-15T22:03:43Z

← Older revision		Revision as of 22:03, 15 July 2006
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	The average daily usage is therefore: 192 gallons of hot water		The average daily usage is therefore: 192 gallons of hot water
	per person: 28 gallons of hot water per day		*per person: 28 gallons of hot water per day

Branska at 22:02, 15 July 2006

2006-07-15T22:02:32Z

@@ Line 98: / Line 98: @@
 The RERC says that  five occupants will use 75+ gallons of hot water in a day.
-Miller's average occupancy for one year is 7. Given RERC's increase of hot water usage per occupant we can assume that 7 occupants would use between 90 and 100 gallons of water per day.
+Our average occupancy is 7 adults, so we expect our daily usage to be a good bit higher.
 <b>Questions that still need to be resolved</b>

Ehrennagel at 13:59, 15 July 2006

2006-07-15T13:59:03Z

← Older revision		Revision as of 13:59, 15 July 2006
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	How long is the typical Miller Farm shower? Who knows... but if we assume the average shower to be ten minutes (as the GRU website does) then a typical Miller Farm Shower would use 18 gallons of hot water, which is only a 10% difference from the online average shower use estimation. Not bad.		How long is the typical Miller Farm shower? Who knows... but if we assume the average shower to be ten minutes (as the GRU website does) then a typical Miller Farm Shower would use 18 gallons of hot water, which is only a 10% difference from the online average shower use estimation. Not bad.

	We can check to see if the 4:1 ratio makes sense by finding the temperature of four gallons of 125 degree water and 1 gallon of 55 degree water: (125x4+55)/5 = ~~111~~ degrees. Since the 4:1 ratio was approximate this result seems reasonable.		We can check to see if the 4:1 ratio makes sense by finding the temperature of four gallons of 125 degree water and 1 gallon of 46 degree water: (125x4+46)/5 = 109 degrees. Since the 4:1 ratio was approximate this result seems reasonable.

	<b>Inlet Temperature:</b>		<b>Inlet Temperature:</b>
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	The RERC says that five occupants will use 75+ gallons of hot water in a day.		The RERC says that five occupants will use 75+ gallons of hot water in a day.
	Miller's average occupancy for one year is 7 ~~<b>(Right Colin?)</b>~~		Miller's average occupancy for one year is 7. Given RERC's increase of hot water usage per occupant we can assume that 7 occupants would use between 90 and 100 gallons of water per day.
	Given RERC's increase of hot water usage per occupant we can assume that 7 occupants would use between 90 and 100 gallons of water per day.

	<b>Questions that still need to be resolved</b>		<b>Questions that still need to be resolved</b>
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	http://www.hydroquebec.com/residential/energywise/calcul_consom.html		http://www.hydroquebec.com/residential/energywise/calcul_consom.html
	*What is the monthly cost of heating water at Miller Farm?		*What is the monthly cost of heating water at Miller Farm?

			*225 minutes to heat 100 gal by 71 degrees from 46 to 125 degrees.
			*100 gal water ~ 833 pound
			*833 ~ 377,842.4 grams
			*temp rise 71 F ~ 21.6 C
			*calories: 8161387.2
			*34,147,244 joules
			*total 2529.4 watts
			*225 minutes = 3.75 hours
			*hot water energy output: 9,485.25 watt-hours or ~9.5 KWH
			elec. energy input = 4500 watts 3.75 hours = 16.9 KWH
			*Which would make our efficiency 0.56

Branska at 12:10, 15 July 2006

2006-07-15T12:10:14Z

← Older revision		Revision as of 12:10, 15 July 2006
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	The RERC says that five occupants will use 75+ gallons of hot water in a day.		The RERC says that five occupants will use 75+ gallons of hot water in a day.
	Miller's average occupancy for one year is 7 <b>(Right Colin?)<b>		Miller's average occupancy for one year is 7 <b>(Right Colin?)</b>
	Given RERC's increase of hot water usage per occupant we can assume that 7 occupants would use between 90 and 100 gallons of water per day.		Given RERC's increase of hot water usage per occupant we can assume that 7 occupants would use between 90 and 100 gallons of water per day.

Branska at 12:06, 15 July 2006

2006-07-15T12:06:48Z

← Older revision		Revision as of 12:06, 15 July 2006
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	We can check to see if the 4:1 ratio makes sense by finding the temperature of four gallons of 125 degree water and 1 gallon of 55 degree water: (125x4+55)/5 = 111 degrees. Since the 4:1 ratio was approximate this result seems reasonable.		We can check to see if the 4:1 ratio makes sense by finding the temperature of four gallons of 125 degree water and 1 gallon of 55 degree water: (125x4+55)/5 = 111 degrees. Since the 4:1 ratio was approximate this result seems reasonable.

			<b>Inlet Temperature:</b>
	Additionally in order to calculate the cost of heating our hot water we needed to know the average inlet water temperature. The below study on residential hot water in the US shows regional averages for inlet temperature, average daily draw and more!		Additionally in order to calculate the cost of heating our hot water we needed to know the average inlet water temperature. The below study on residential hot water in the US shows regional averages for inlet temperature, average daily draw and more!

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	*According to this source Indiana's average inlet water temperature ( in 1998) was 43-49F		*According to this source Indiana's average inlet water temperature ( in 1998) was 43-49F
	*It is also nice to see that the regional set point average is between 134- 136F and our setpoint is 125F		*It is also nice to see that the regional set point average is between 134- 136F and our setpoint is 125F

			<b>Estimating Household Usage:</b>
			*With the hot water heater, shower, and washing machine information we can use the hot water usage estimates to estimate the daily hot water use at Miller Farm. To check our estimates we are using the below site which estimates hot water consumption per household occupants.

			*[http://www.rerc-vt.org/shw_investing.htm Renewable Energy Resource Center]

			The RERC says that five occupants will use 75+ gallons of hot water in a day.
			Miller's average occupancy for one year is 7 <b>(Right Colin?)<b>
			Given RERC's increase of hot water usage per occupant we can assume that 7 occupants would use between 90 and 100 gallons of water per day.

	<b>Questions that still need to be resolved</b>		<b>Questions that still need to be resolved</b>

Branska at 11:53, 15 July 2006

2006-07-15T11:53:20Z

← Older revision		Revision as of 11:53, 15 July 2006
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	*[http://www.eere.energy.gov/buildings/appliance_standards/residential/pdfs/waterheater_lifecycle_1098.pdf US Department of Energy Residential Water Heater Analysis 1998]		*[http://www.eere.energy.gov/buildings/appliance_standards/residential/pdfs/waterheater_lifecycle_1098.pdf US Department of Energy Residential Water Heater Analysis 1998]

	*According to this source Indiana's average inlet water temperature ( in 1998) was 49-~~53F~~		*According to this source Indiana's average inlet water temperature ( in 1998) was 43-49F
	*It is also nice to see that the regional set point average is between 134- 136F and our setpoint is 125F		*It is also nice to see that the regional set point average is between 134- 136F and our setpoint is 125F

Branska at 11:42, 15 July 2006

2006-07-15T11:42:04Z

← Older revision		Revision as of 11:42, 15 July 2006
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	Additionally in order to calculate the cost of heating our hot water we needed to know the average inlet water temperature. The below study on residential hot water in the US shows regional averages for inlet temperature, average daily draw and more!		Additionally in order to calculate the cost of heating our hot water we needed to know the average inlet water temperature. The below study on residential hot water in the US shows regional averages for inlet temperature, average daily draw and more!

	*[http://www.eere.energy.gov/buildings/appliance_standards/residential/pdfs/waterheater_lifecycle_1098.pdf]		*[http://www.eere.energy.gov/buildings/appliance_standards/residential/pdfs/waterheater_lifecycle_1098.pdf US Department of Energy Residential Water Heater Analysis 1998]

	*According to this source Indiana's average inlet water temperature ( in 1998) was 49-53F		*According to this source Indiana's average inlet water temperature ( in 1998) was 49-53F

Branska at 11:40, 15 July 2006

2006-07-15T11:40:08Z

← Older revision		Revision as of 11:40, 15 July 2006
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	*(1) Washing Machine		*(1) Washing Machine

	~~Applience~~ Information:		Appliance Information:

	*Water Heater [http://www.hotwater.com/lit/spec/media/res_elec/aress00706.pdf AO Smith ProMax ECT-52]		*Water Heater [http://www.hotwater.com/lit/spec/media/res_elec/aress00706.pdf AO Smith ProMax ECT-52]
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	We can check to see if the 4:1 ratio makes sense by finding the temperature of four gallons of 125 degree water and 1 gallon of 55 degree water: (125x4+55)/5 = 111 degrees. Since the 4:1 ratio was approximate this result seems reasonable.		We can check to see if the 4:1 ratio makes sense by finding the temperature of four gallons of 125 degree water and 1 gallon of 55 degree water: (125x4+55)/5 = 111 degrees. Since the 4:1 ratio was approximate this result seems reasonable.

			Additionally in order to calculate the cost of heating our hot water we needed to know the average inlet water temperature. The below study on residential hot water in the US shows regional averages for inlet temperature, average daily draw and more!

			*[http://www.eere.energy.gov/buildings/appliance_standards/residential/pdfs/waterheater_lifecycle_1098.pdf]

			*According to this source Indiana's average inlet water temperature ( in 1998) was 49-53F
			*It is also nice to see that the regional set point average is between 134- 136F and our setpoint is 125F

	<b>Questions that still need to be resolved</b>		<b>Questions that still need to be resolved</b>

Branska at 00:28, 12 July 2006

2006-07-12T00:28:59Z

← Older revision		Revision as of 00:28, 12 July 2006
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	Results:		Results:
	Dan prefered 108.3F		*Dan prefered 108.3F
	Ehren 109.4F		*Ehren 109.4F
	Kate 102F		*Kate 102F

	Average temp.: 106.3 degrees F.		Average temp.: 106.3 degrees F.