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1 This presentation is posted for public use. ACEEE does not endorse any product or service. ACEEE accepts no responsibility for any facts or claims this presentation may contain.
2 Where is Hot Water in High Performance Buildings? Gary Klein Affiliated International Management, LLC. P.O. Box Newport Beach, CA Tel:
3 Why Do I Work on Hot Water? Energy Intensity of Indoor Cold Water Range from 5 to 25 kwh per 1000 gallons Energy Intensity of Hot Water 85 kwh per 1000 gallons Heat Pump with COP of 2 and 70 F temperature rise 440 kwh per 1000 gallons Gas Water Heater with efficiency of 0.5 and 90 F temperature rise Hot Water is 3.4 to 88 times more energy intensive than indoor cold water.
4 The Hot Water System Treatment and Delivery to the Building Use in the Building Water Heater Piping Fixtures, Fittings and Appliances Behavior Water Down the Drain Waste Water Removal and Treatment How do the interactions among these components affect system performance? Which is the biggest variable in determining water and energy use?
5 Typical Simple Hot Water System Hot Water Energy Hot Water Outlet Cold Water Mixed Temperature Water Water Heater Drain Indoor Boundary Fuel Source Water Source Sewer
6 Typical Central Boiler Hot Water System Indoor Boundary Hot Water Storage Tank Standard Hot Water Circulation Loop Boiler Boiler Loop Energy Cold Water Mixed Temperature Water Apartment, or Hot Water Outlet Drain Fuel Source Water Source Sewer
7 Typical Hot Water Event Temperature Water Heater Temperature Useful Hot Water Temperature Delivery Use Cool Down Time
8 How do we use hot water? Frequent short, low flow rate draws Occasional long draws at low flow rates High flow rate and high volume draws are rare
9 How Do We Conserve Hot Water? Use less hot water (volume) per event Begins with the water heater Passes through the hot water distribution system Discharges through the fixture fittings and appliances Mixed temperature water runs down the drain Total is due to a combination of structural and behavioral considerations. The supply of hot water ends at the fixtures and appliances, not at the customer s meter, The future of water conservation programs depends on getting the structural considerations correct today. Begin with the end in mind How much do you want to waste?
10 Remember What People Want Hot Water Now = Instantaneousness Need hot water available before the start of each draw. A tank with hot water Heated pipes Need the source of hot water close to each fixture or appliance Point of Use is not about water heater size, its about location Never Run Out in My Shower = Continousness Need a large enough tank or a large enough burner or element Or, a modest amount of both
11 Four Questions 1. Where is the location of the hot water event in relation to the source of hot water? 2. How long is the time until the next hot water event? 3. What is the temperature of the hot water needed for that subsequent event? 4. What is the volume of water in the pipe that eventually cools down?
12 The Ideal Hot Water Distribution System Has the smallest volume (length and smallest possible diameter) of pipe from the source of hot water to the hot water outlet. Sometimes the source of hot water is the water heater, sometimes a trunk line. For a given layout (floor plan) of hot water locations the system will have: The shortest buildable trunk line Few or no branches The shortest buildable twigs The fewest plumbing restrictions Insulation on all hot water pipes, wall thickness = pipe diameter
13 To Improve the Delivery Phase: Get hotter water sooner by minimizing the waste of water, energy & time Reduce the volume of water in the pipe (smaller diameter, shorter length) Reduce the number of restrictions to flow (decrease effective length ) Increase the face velocity (smaller diameter pipe or a demand controlled pump) Insulate the pipe (becomes critical for very low flow rates and adverse environmental conditions)
14 To improve the use phase: Minimize the thermal losses the water heater needs to overcome in the piping during a hot water event. Insulate the pipes Increases pipe temperature and reduces heat loss during a hot water event. This is particularly important for low flow fixtures and appliances. Take advantage of the energy savings: Keep the water heater temperature the same and change the mix point Reduce the water heater temperature setting. Combine both strategies.
15 To improve the cool down phase: Increase the availability of hot water and minimize the waste of water, energy and time Insulate the pipes Increases the time pipes stay hot between events. R 4 insulation doubles cool down time with ½ inch pipe, triples it with ¾ inch pipe. Equal heat loss per foot, regardless of pipe diameter Is there a priority to insulating the pipes? Trunks, branches, twigs? Duration of hot water events? Time between hot water events?
16 The Key to Efficient Hot Water Distribution Reduce the volume of water between the source of hot water and the hot water outlet. How much do you want to waste? 1 gallon or more? 0.5 gallons? 0.25 gallons (4 cups)? gallons (2 cups)? gallons (1 cup)?
17 Combi Systems One Thermal Engine How many days a year do we use hot water? In a BA home, how many days a year do we need heating? Size of heating peak? Size of water heating peak? Why are we still so focused on condensing furnaces and not on condensing water heaters that can also heat the house?
18 What About Solar Water Heating? Back up Will you have a back up? What is your expectations for cloudy days? How does the back up handle almost hot enough preheated water? 0.25 gpm, 1F temperature rise = 125 Btu Solar Fraction Combined Water and Space Heating Cost Maintenance Simple Solar
19 Relative Efficiency of Water Heaters???% 200% 100% 80% 60% 40% 20% 0 Daily Hot Water Consumption DOE Test Volume 64 Gallons Per Day Solar Preheat & Boost Heat Pump Preheat & Boost Electric Preheat & Boost Electric Storage Electric Tankless Condensing Gas Gas Storage Gas Tankless Standby losses less of a factor as consumption increases typical of commercial applications
20 The Answer Part 1 Wring out the waste. Decrease the volume between source of hot water and the use Insulate the hot water piping Utilize the waste heat running down the drain Improve the efficiency of hot water use. Reduce hot water outlet flow rates Reduce the volume of hot water needed for each task Increase the efficiency making hot water. Preheat solar, heat pump, off peak electric Select a very efficient booster that works with preheated water to reach the desired temperature and for continuousness Combine water and space heating
21 The Answer Part 2 R r i i g g h h t t pipe SHORT, STRAIGHT, SMOOTH, - s i z e d
22 Has Someone Moved Our Cheese?
23 100 Units of Energy
24 89 Units of Energy
25 45 Units of Energy
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29 Some Useful Resources How to Win Friends and Influence People How I Raised Myself from Failure to Success in Selling Personality Plus Personality Profile The Great Connection The Go Getter The Richest Man in Babylon
30 Given human nature, it is our job to provide the infrastructure that supports efficient behaviors
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