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High Efficiency Unit Heaters

High Efficiency Unit Heaters

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High Efficiency Unit Heaters

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  1. High Efficiency Unit Heaters Workpaper Presentation Prepared for Cal TF Presentation Sept 24, 2014

  2. Overview • Seeking TF approval of draft workpaper • Measure Description • Measure Summary • Abstract Review Comments – Cal TF • Abstract Review Comments – Commission Staff • CEUS data: SCE vs. statewide • EFLH: Connected vs. peak load, other considerations • Savings: WP vs DEER • IMC

  3. Measure Description • Unit Heater • Self-contained, automatically-controlled, vented fan-type gas space heater designed to be installed without ducts, within the heated space • Thermal Efficiency: 90% or above (11% improvement) • Size ranging 50~600 kBtuh • Measure Application Type • ROB/NC • Measure Delivery Type • Prescriptive rebate per kBtuh • Impacted Market • Non-residential • Warehouses, distribution facilities, garages, loading docks, & etc. • Market Potential • Low shipping volume in CA

  4. Measure Summary • Gas Savings • 0.38 therms/kBtuh (CA average) • Range between 0.17 ~ 0.87 therm/kBtuh for 16 CZs • Decreased by a factor of 2.85 (peak load vs. connected load) • IMC • $8.17/kBtuh • Incremental equipment cost + additional material & labor for condensing unit • EUL • 20 years • DOE shipping data + DEER HVAC-Frnc • Net-to-Gross: • 0.70 default value per DEER All-Default<=2yrs

  5. Abstract Comments– Cal TF • EUL – 20 years • Oversizing • No oversizing factor to be considered • Savings Methodology • Engineering calculation using CEUS and other resources • Building type • Use warehouses • Enclosed space with an appropriate temperature control

  6. Abstract Comments– Commission Staff • Calculating savings based on the actual capacity and climate zones. • Equivalent full load hours highest in SCE • EFLH: • Non-coincident peak heating load vs. Total connected equipment load • Comparison to simplified DEER • Additional Installation Cost

  7. Savings Calculation

  8. CEUS:SCE vs. Statewide • Utilities Areas in CEUS • SCE: Substantially higher consumption (W/H) • SCE: Lower than PG&E (20%) for other building types • Study Sample • 250 warehouses surveyed • 65 sites metered • TF Feedback Requested: Use statewide data?

  9. CEUS: Equivalent Full Load HourPeak Load vs. Connected Load • Peak Load • Calibrated using metered data collected by fan measurements for sample of buildings • One-hour maximum consumption, based on simulated load profile • Connected Load • Gathered from actual site surveys of equipment inventories • Represents how equipment is actually sized and placed for this building type

  10. Equivalent Full Load Hour:Additional Considerations • Operation depends on • Thermostat settings and setback schedules • Bldg. location and climate • Door openings • Ventilation system • Ceiling heights • Internal heating loads • Agreed on “Connected Load”?

  11. Comparison with Simplified DEER • Preliminary analysis using DEER by Commission Staff • Conditioned Storage (SCn) • D08-NE-HVAC-airAC-SpltPkg-240to759kBtuh-9p8eer • Measure Case: HEATING-HIR = 1.11  • Base Case: HEATING-HIR = 1.25 • Are savings reasonable?

  12. Consideration of Cost • Additional labor and supporting material • Site-specific conditions dictating whether installation cost is higher or lower than conventional unit heaters. • Condensate disposal • Replacement of existing flue • Condensate neutralizers, and outdoor-air dampers require periodic servicing • Estimated additional $500 incremental installation cost per unit • IMC: $6.07 (equipment) + $2.10 (installation) = $8.17 / kBtuh

  13. Question or Comment?