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Private and Confidential Hot Water Temperature Maintenance.

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Presentation on theme: "Private and Confidential Hot Water Temperature Maintenance."— Presentation transcript:

1 Private and Confidential Hot Water Temperature Maintenance

2 Private and Confidential Enter Date Here page 2 HWAT Simply Keeps Hot Water Hot Water provided from Water Heater Insulation Pipe Heat provided by HWAT heating cable Heat lost through the insulation Air at 70F HWAT heating cable

3 Private and Confidential Enter Date Here page 3 Movement of Water in HWAT System Water heater is set to the desired maintain temperature HWAT maintains the hot water by replacing the heat lost through the thermal insulation HWAT-Y2 70F Water moves through fixture. Water in untraced section cools to ambient 70F Heated water moves into pipes. Hot water arrives at fixture.

4 Private and Confidential Enter Date Here page 4 HWAT or Recirculation? HWAT Recirculation

5 Private and Confidential Enter Date Here page 5 Water Heater Recirculation Pump Return Piping Balancing Valves Typical Recirculation System

6 Private and Confidential Enter Date Here page 6 Water Heater HWAT Heating Cable Typical HWAT System

7 Private and Confidential Enter Date Here page 7 HWAT History  System developed by Raychem in 1976  Installed in more than 300,000 buildings  More than 2,500,000 feet of HWAT cable installed every year  More successful in Europe due to a greater focus on water and energy conservation which is only a recent trend in North America

8 Private and Confidential Enter Date Here page 8 Advantages of HWAT  Easy to design  Low installed and operating costs  No flow-balancing issues  Compatible with low-flow fixtures  Easy to provide instant hot water to the point of use  Water conservation/Reduced time to tap

9 Private and Confidential Enter Date Here page 9 Time to Tap – Water Conservation  Water in 10’ of ½” pipe = 0.1 gallons  Water in 40’ of ¾” pipe = 0.9 gallons  Water between fixture and recirculation loop = 1.0 gallons  If this fixture is used 5 times per day, the annual water waste would be 1,825 gallons per year!

10 Private and Confidential Enter Date Here page 10 Disadvantages of HWAT  Perceived as new technology  May not be economical for certain building configurations  “Me-Too” competitive systems fail to perform as expected on an HWAT design

11 Private and Confidential Enter Date Here page 11 Typical HWAT Building Why is this a good HWAT application?

12 Private and Confidential Enter Date Here page 12 Typical HWAT Building  No horizontal return piping  No booster pumps or booster heaters  No balancing  Reduced supply piping

13 Private and Confidential Enter Date Here page 13 Typical HWAT Building

14 Private and Confidential Enter Date Here page 14 HWAT Performance Issues Hot water heater continues to maintain the water at 115F. HWAT replaces heat lost through the insulation and keeps the water at 115F. HWAT-G2 Ambient temperature Water moves through fixture. Heated water moves into pipes. Uninsulated or unpowered section of HWAT 115 HWAT maintained water arrives at fixture. Ambient temperature Slug Arrives at fixture. Sections without insulation or power

15 Private and Confidential Enter Date Here page 15 HWAT Performance Issues Hot water heater continues to maintain the water at 115F. HWAT replaces heat lost through the insulation and keeps the water at 115F. Cold water pulled into hot side through hot to cold connection HWAT-G2 Ambient temperature Water moves through fixture. Heated water moves into pipes. Heated water mixes with by- pass water 115 HWAT maintained water arrives at fixture. By-pass water Arrives at fixture. Cold to hot cross connection at fixture. Cold to Hot water by-pass

16 Private and Confidential Enter Date Here page 16 Main Mixing Valves Main mixing valves are usually flow dependent. There should be a low flow and a high flow valve. If there’s only one, be sure it can function in a low/no flow situation. Mixing Valves

17 Private and Confidential Enter Date Here page 17 Typical Maintain Temperatures TemperatureApplication 105°F Hospitals, Nursing Homes 115°F Schools, Prisons 125°F Hotels, Apartments, Offices 140°F Kitchens, Laundries 125°F Residential

18 Private and Confidential Enter Date Here page 18 HWAT Heating Cables  B °F  G °F  Y °F  R °F  Y2 or R2  R2

19 Private and Confidential Enter Date Here page 19 HWAT Selling Tools

20 Private and Confidential Enter Date Here page 20 HotCAP  Hot Water Cost Analysis Program  Introduced in March, 2004  Integrates HWAT-ECO  Updated material costs  Updated labor, electricity and fuel rates  Download from web

21 Private and Confidential Enter Date Here page 21 HWAT-ECO Electronic Controller  Flexible temperature control  Insulation schedule  Energy savings  9 pre-defined programs  Heat-up cycle  Alarm events  Water heater sensor  BMS interface  Master/slave function  Power correction factor

22 Private and Confidential Enter Date Here page 22 Flexible Temperature Control Maintain Temp HWAT-Y2105°F – 125°F* HWAT-R2105°F – 140°F *Depending on the ambient temperature and voltage

23 Private and Confidential Enter Date Here page 23 Fiberglass Insulation Schedule Copper pipe size (in) IPS insulation size (in) Insulation thickness (in) ½ ¾ ½ ¾ ¼ 1 1¼ 1½ 1½ 1½ 1½ 1½ ½ 2½ 2½  Insulation thickness matches pipe diameter for equal heat loss  Pipes 1¼” and smaller require oversized insulation to allow room for the heating cable  For pipes 3” and larger, 1/3 the thickness of insulation can be used with 2 runs of heating cable

24 Private and Confidential Enter Date Here page 24 HWAT-ECO Limits the Power Output  400 seconds duty cycle  “On” time depends on the desired maintain temperature  4 Modes: Off, Economy, Maintain & Heat-Up Cycle OFF ON 15% ON 400’’800’’1200’’ 1600’’0’’ Economy Temperature sec. OFF ON 55% ON 400’’800’’1200’’ 1600’’0’’ Maintain Temperature sec.

25 Private and Confidential Enter Date Here page 25 9 Pre-defined Programs

26 Private and Confidential Enter Date Here page 26 Programming Options  (48) ½ hour time blocks  Additional energy savings during “Off” and “Economy”

27 Private and Confidential Enter Date Here page 27 Heat-Up Cycle and Cool Down  Raise the water temperature of stagnant pipes  Determine the amount of time required to reach a desired maintain temperature  Program the number of hours required  Allow time to cool down before hot water usage

28 Private and Confidential Enter Date Here page 28 Alarm Events  Water heater temperature too low (next slide)  Water heater temperature too high (Y2 > 150°F, R2 > 185°F)  Loss of power – relay closes  Loss of power for more than 8 hours – clock reset  Internal controller temperature too high (> 185°F)  Master/slave error

29 Private and Confidential Enter Date Here page 29 Water Heater Sensor (Optional)  Ensures maintain temp does not exceed the water heater temp  Controller stores highest water temperature measured over last 24 hours  Delta between supplied water temperature and the maintain temperature setpoint selected between 9°F and 27°F  Connected to single or master controller only  Sensor cable can be extended up to 328 feet

30 Private and Confidential Enter Date Here page 30 BMS Interface  BMS input is 0-10 Vdc  BMS controls the temperature setpoint  If water heater sensor is installed, it overrules the BMS temperature setting if necessary  Loss of power alarms BMS

31 Private and Confidential Enter Date Here page 31 Master/Slave Function  Control up to eight additional controllers  Total maximum length of cable between all controllers is 328 ft  RS-485 connection  Water heater sensor connects only to master controller  Controllers on the same phase (max 3 controllers) have a delayed On and Off

32 Private and Confidential Enter Date Here page 32 Multiple Circuits with Single Controller  For controlling multiple circuits with the same parameters (i.e. voltage, maintain temp, ambient temp, economy temp), connect the heating cable output relay to an external contactor coil

33 Private and Confidential Enter Date Here page 33 Power Correction Factor  Fine tuning of system  Increase or decrease the actual pipe maintain temperature  0.6 – 1.4 percent of duty cycle

34 Private and Confidential Enter Date Here page 34 Legionella ~ What is it?  Received its name from a 1976 break out at an American Legion Convention in Philadelphia  Bacteria common to warm water environments  Cause of Legionellosis – any illness caused by the bacteria (Legionnaires’ disease and Pontiac Fever most common)  Attacks the respiratory system

35 Private and Confidential Enter Date Here page 35 Legionella ~  Legionella 2003: an Update and Statement by the Association of Water Technologies (AWT)  “raising water temperature to 122˚F = a 90% kill of legionella in 2 hours, 140˚F = a 90% kill of legionella in 2 minutes and 158˚F = a 100% rapid kill of legionella.”

36 Private and Confidential Enter Date Here page 36 Hot Water Temperature Maintenance  Questions?


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