html5-img
1 / 23

Variable Speed Heat Pumps

Variable Speed Heat Pumps. Provisional UES Proposal Presentation to the Regional Technical Forum September 18, 2012 Presentation by Kacie Bedney, Bonneville Power Elizabeth Daykin, Bonneville Power Ben Larson, Ecotope. Overview.

conan-dyer
Télécharger la présentation

Variable Speed Heat Pumps

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. Variable Speed Heat Pumps Provisional UES Proposal Presentation to the Regional Technical Forum September 18, 2012 Presentation by Kacie Bedney, Bonneville PowerElizabeth Daykin, Bonneville Power Ben Larson, Ecotope

  2. Overview • Heat pump measures’ applicability clarified to exclude variable speed heat pumps (VSHP) at May 2012 RTF meeting • 83 VSHP systems reported to BPA • BPA is conducting research to establish savings for this measure

  3. Measure Summary • Measure name: Variable Speed Heat Pumps • Measure Sponsor: BPA • Measure description: • Installation of high efficiency variable speed air source heat pumps to replace an electric forced air furnace. 12 HSPF / 18 SEER • Requesting Status: Provisional

  4. Measure Classification

  5. Measure Identifiers

  6. Baseline Specifications • Two baseline HVAC systems: • Electric Forced Air Furnace - w/ and w/o AC • ASHP - 8.5 HSPF 14.0 SEER • PTCS controls, commissioning, and sizing in base • Three building types (weighted): • 1,344 ft2 single-story ranch house (5%) • 2,200 ft2 split-level house (67%) • 2,688 ft2 house with basement (28%)

  7. Baseline Specifications Cont’d • Last measure in – existing houses weatherized, lighting upgraded • Same characteristics as those used for GSHP analysis • http://www.nwcouncil.org/energy/rtf/measures/res/archive/ResGSHP_v2_1.xlsm

  8. VSHP Performance Model: SEEM • Ecotope developed based on the Carrier Corporation 25VNA InfinityTM VSHP • HSPF 12, SEER 18 • Product specification sheet provides: input power and output capacity at 10°F increments for both min & max indoor air handler flow • Min and max inputs and outputs • Previous work basing performance model from spec sheet data suggests assessment is likely optimistic - field & lab work needed.

  9. Carrier Spec Sheet Data

  10. Curve Fits • Performance curve fitted to spec sheet data using regression techniques • Input = ƒ(Tout, Trp, CFM) • Output = ƒ(Tout, Trp, CFM) • Currently, no cooling curve fit. Cooling improvements assumed to occur in proportion to heating improvements.

  11. Variable Capacity Considerations: Controls & Airflow • Assert HP controller follows house load • Assert it is similar to observed DHP behavior • Ex: If VSHP runs for 45 mins at full output for 1 hour, in the next hour it runs at 75% output for 1 hour. • Airflow is a function of capacity and changes every hour within simulation • Duct losses vary with varied airflow • This model shows ~5% increase in duct losses over a single speed system

  12. Example Simulation Output • 2200ft2 house with UA= 475 Btu/hr-F • Heat pump size = 3 tons • Eugene, OR climate. January 10-11.

  13. Higher duct losses for VSHP when operating at lower airflows requires more overall heat output Higher COP for VSHP system requires less energy input Capacity changes based on load. Min capacity is ~40%

  14. Measure Cost Summary • Baseline costs for upgrade and conversion rely on air-source heat pump analyses • VSHP costs are from customer invoices • Upgrade $2,851 incremental cost • Conversion incremental cost • FAF w/ CAC $5,616 • FAF w/o CAC $6,975

  15. Measure Life Summary • Measure life of 20 years • Available default EUL • Sunset Criteria: • Measure shall sunset at the end of 2014, at which time the field work and lab testing results will inform updated SEEM runs

  16. Cost Effectiveness

  17. Checklist

  18. Checklist – cont’d

  19. Plan for Data Collection and Analysis – laboratory testing • Lab testing for performance curves • Spring/Summer 2013 • 2-ton outdoor unit, 2 to 3.5 ton indoor unit AHRI ref # 4618711 • Tested at high, intermediate and low compressor speeds • Tested over a range of indoor and outdoor conditions (ODT 17 deg – 62 deg) • AHRI steady state heating tests

  20. Plan for Data Collection and Analysis: field test • BPA-led advisory committee • Committee to assist in developing: • method for evaluating the performance • appropriate M&V plan • what data to collect what & how to measure • duration of the tests • number of sites to test • Combine lab and field testing into SEEM model to determine annual estimated savings • Winter 2013

  21. Contacts • BPA Kacie Bedney kcbedney@bpa.gov 503.230.4631 • Ecotope Ben Larson ben@ecotope.com 206.322.3753 x207 Stephanie Vasquez smvasquez@bpa.gov 503.230.3492

  22. RTF Proposed Motion: “I _________ move that the RTF approve the Residential VSHP UES Measure as Provisional with Active status.”

More Related