1 / 17

Northern Climate HPWH Specification Update

Northern Climate HPWH Specification Update. Jeff Harris, NEEA For 8/30/11 RTF Meeting. Why a Northern Climate Spec?. Ensure energy savings & customer satisfaction in “Northern” climates Reliable energy savings in real world, real climate conditions

virginie
Download Presentation

Northern Climate HPWH Specification Update

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Northern Climate HPWH Specification Update Jeff Harris, NEEA For 8/30/11 RTF Meeting

  2. Why a Northern Climate Spec? Ensure energy savings & customer satisfaction in “Northern” climates • Reliable energy savings in real world, real climate conditions • Ensure customer satisfaction with hot water delivery, noise, reliability, etc. Long term goal: Influence Federal standards (DOE and Energy Star)

  3. Timeline and Direction First version released October 28, 2009 Interaction with all major US mfgs and numerous European and Asian mfgs • Testing done on GE, AO Smith, Rheem, Air Generate, Bosch • Expect several to meet either Tier 1 or Tier 2 of new standard • Comments provided to Energy Star June 24th • Updated version expected complete in September (pending additional mfg input)

  4. Overview of Contents and Changes • Scope: Integrated units only, split-systems in future • Energy Star compliance • Product Tiering • Northern Climate Energy Factor • Northern Climate Delivery Rating • Sound levels • Freeze Protection • Warranty/Service • Compressor shut-down/notification • Ducting Condensate Management • Air filters: maintenance/notification • Minimal electric element usage NEW NEW NEW Updated NEW Updated NEW

  5. New: Product Tiers *In default operating mode, units shall make minimal use of electric resistance heating elements in order to maximize energy savings potential. During the first draw of the standard DOE First Hour Rating Test, the electric resistance heating element shall not be turned on until at least 66% of the tank’s measured water volume has been withdrawn. Measured volume is defined as the amount of water the unit under test actually stores and not the rated tank volume.

  6. New: Northern Climate Energy Factor Concept: Calculate an Energy Factor (EFNC) representative of performance for equipment installed in unconditioned, house buffer spaces (e.g. garages and unheated basements) in northern climates. Process: Leverage existing EF DOE test (at 67°F) with additional measurement and calculations to determine EFNC • Conduct additional EF test at 50°F ambient, 50°F inlet • Determine compressor “shut-off” temp, tank UA, and EF with resistance element • Use weighted distribution of temperature bins • Calculate single EFNCvalue

  7. T bin Table Climate data from 6 Northern cities (Boston, Chicago, Indianapolis, Minneapolis, Omaha, Seattle) SUNCODE and SEEM models used to calculate tempering effect of garage and basement locations Assumes 50/50 distribution of garage and basement locations

  8. Current NC EF Calculations

  9. New: Northern Climate Delivery Rating Concept: Rate units on ability to deliver hot water in cool ambient conditions while maintaining high efficiency operation in the default operating mode. Reported in how many showers the water heater can give until the outlet temperature gets too cold or the efficiency drops significantly (resistance element turns on). Will not be used to determine Northern Climate Spec compliance, but rather a sizing aid for consumers Draw profile: 8 mins at 2gpm, 5 min off, repeat

  10. Moving Forward • Reviews with HPWH mfgs scheduled for early September • Product Assessment worksheet available to aid in product qualification process • NEEA will manage “Qualified Products” list • NEEA will continue lab testing through 2012

  11. Thank you

  12. Additional slides

  13. Northern Climate EF Calculations • 1.0 Test setup and procedure: • EF67: Follow standard DOE 24-hour test procedure (Section 6 of 10 CFR Pt. 430, Subpart B, App. E). • EF50: Follow standard DOE 24-hour test procedure with the following adjustments: • Ambient conditions shall be 50°F dry bulb, 44°F wet bulb (58% R.H.). • Inlet water temperature: 50°F Ccutoff: Compressor cut-off temperature. See Appendix E.

  14. NC EF (continued) • 2.0 Calculation Methodology: • The Northern Climate EF utilizes a temperature bin weighted calculation. The method is based on the Heating Seasonal Performance Factor (HSPF) method for space conditioning heat pumps. • Definitions: • EF67 is the energy factor from the standard DOE 24-hour test, at 67°F. • EF50 is the energy factor based on the standard DOE 24-hour test, at 50°F. • EFRis the energy factor for the HPWH operating in resistance-only heat mode.

  15. NC EF (continued)

  16. Northern Climate Delivery Rating • 1.0 Test setup: • Follow setup procedure for standard DOE 24-hour test (Section 6 of 10 CFR Pt. 430, Subpart B, App. E) with the following changes to test conditions: • Tamb= 50°F, Tset point = 120°F, Tinletwater = 50°F, Airflow = unrestricted.

  17. NC Delivery Rating (continued) • 2.0 Test procedure: • Draw Pattern: draw 2 gpm for 8 minutes followed by 5 minutes with no draw. Repeat this segment as many times as necessary until the test ending conditions are met. • Test ending sequence: • Begin the test ending sequence when either of the following conditions occurs: • Outlet water temperature, Tout, falls below 105°F or • Any resistance element in the tank turns on • After these conditions occur, finish the current draw cycle and complete one subsequent draw cycle. Allow the tank to recover then terminate data collection.

More Related