high efficiency unit heaters
DESCRIPTION
High Efficiency Unit Heaters. Workpaper Presentation Prepared for Cal TF Presentation Sept 24, 2014. Overview. Seeking TF approval of draft workpaper Measure Description Measure Summary Abstract Review Comments – Cal TF Abstract Review Comments – Commission Staff - PowerPoint PPT PresentationTRANSCRIPT
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High Efficiency Unit Heaters
Workpaper PresentationPrepared for Cal TF PresentationSept 24, 2014
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
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
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
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
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
Savings Calculation
𝑈𝑛𝑖𝑡 𝐻𝑒𝑎𝑡𝑒𝑟 𝐴𝑛𝑛𝑢𝑎𝑙𝑂𝑝𝑒𝑟𝑎𝑡𝑖𝑛𝑔𝐻𝑜𝑢𝑟𝑠(𝐸𝐹𝐿𝐻 )(𝐻𝑟𝑌𝑟 )=
𝐻𝑒𝑎𝑡𝑒𝑑 h𝑊𝑎𝑟𝑒 𝑜𝑢𝑠𝑒𝐻𝑒𝑎𝑡𝑖𝑛𝑔𝐸𝑈𝐼 ( 𝑘𝐵𝑡𝑢𝑆𝑞 .𝐹𝑡−𝑌𝑟 )
𝐶𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑 h𝑊𝑎𝑟𝑒 𝑜𝑢𝑠𝑒𝐻𝑒𝑎𝑡𝑖𝑛𝑔 𝐿𝑜𝑎𝑑 (𝑘𝐵𝑡𝑢/𝐻𝑟𝑆𝑞 .𝐹𝑡 )
𝐵𝑎𝑠𝑒𝑙𝑖𝑛𝑒𝐶𝑜𝑛𝑠𝑢𝑚𝑝𝑡𝑖𝑜𝑛(𝑘𝐵𝑡𝑢𝑌𝑟 )=𝐴𝑣𝑒𝑟𝑎𝑔𝑒𝐻𝑒𝑎𝑡𝑒𝑟 𝐶𝑎𝑝𝑎𝑐𝑖𝑡𝑦 (𝑘𝐵𝑡𝑢𝐻𝑟 )×𝐴𝑛𝑛𝑢𝑎𝑙𝑂𝑝𝑒𝑟𝑎𝑡𝑖𝑛𝑔𝐻𝑜𝑢𝑟𝑠(𝐻𝑟𝑌𝑟 )
𝐴𝑣𝑒𝑟𝑎𝑔𝑒𝐻𝑒𝑎𝑡𝑖𝑛𝑔 𝐿𝑜𝑎𝑑(𝑘𝐵𝑡𝑢𝑌𝑟 )=𝐵𝑎𝑠𝑒𝑙𝑖𝑛𝑒𝐶𝑜𝑛𝑠𝑢𝑚𝑝𝑡𝑖𝑜𝑛 (𝑘𝐵𝑡𝑢𝑌𝑟 )×𝐵𝑎𝑠𝑒𝑙𝑖𝑛𝑒 𝐸𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑐𝑦 (80%)
h𝐻𝑖𝑔 𝐸𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑐𝑦 𝐶𝑜𝑛𝑠𝑢𝑚𝑝𝑡𝑖𝑜𝑛(𝑘𝐵𝑡𝑢𝑌𝑟 )=𝐴𝑣𝑒𝑟𝑎𝑔𝑒𝐻𝑒𝑎𝑡𝑖𝑛𝑔𝐿𝑜𝑎𝑑 (𝑘𝐵𝑡𝑢𝑌𝑟 )
h𝐻𝑖𝑔 𝐸𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑐𝑦 (90%)
𝐺𝑎𝑠𝑆𝑎𝑣𝑖𝑛𝑔𝑠 ( h𝑇 𝑒𝑟𝑚h𝑘𝐵𝑡𝑢 )=
𝐵𝑎𝑠𝑒𝑙𝑖𝑛𝑒𝐶𝑜𝑛𝑠𝑢𝑚𝑝𝑡𝑖𝑜𝑛(𝑘𝐵𝑡𝑢𝑌𝑟 )− h𝐻𝑖𝑔 𝐸𝑓𝑓𝑖𝑐𝑖𝑒𝑛𝑐𝑦𝐶𝑜𝑛𝑠𝑢𝑚𝑝𝑡𝑖𝑜𝑛(𝑘𝐵𝑡𝑢𝑌𝑟 )𝐴𝑣𝑒𝑟𝑎𝑔𝑒𝐻𝑒𝑎𝑡𝑒𝑟 𝐶𝑎𝑝𝑎𝑐𝑖𝑡𝑦 ( h𝑘𝐵𝑡𝑢 )×100 ( 𝑘𝐵𝑡𝑢
h𝑇 𝑒𝑟𝑚 )
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?
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
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”?
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?
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
Question or Comment?