HomeMy WebLinkAboutAS12-054 Senior Housing Polysun Report - Financial[1]Financial Report
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Vela Solaris AG, their distribution partners or SPF do not accept any liability for the correctness of the specifications and the results.
City of Tanana Senior
Housing Complex
Space heating and DHW system
Location of the system
USA
AK Fairbanks
Longitude: -147.98°
Latitude: 64.82°
Elevation: 446 ft
This report has been created by:
Nathan Stumpff - Arctic Sun, LLC
Thorsten Chlupp
Po Box 74798
99707 Fairbanks
907/457-1297
System overview (annual values)
Total fuel and/or electrical energy consumption of
the system [Etot]241,408 kBtu
Total energy consumption [Quse]242,809.8 kBtu
System performance (Quse / Etot)1.01
Comfort demand Energy demand covered
Financial Report
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Vela Solaris AG, their distribution partners or SPF do not accept any liability for the correctness of the specifications and the results.
Overview solar thermal energy (annual values)
Collector area 326.9 ft²
Solar fraction total 20.8%
Solar fraction hot water [SFnHw]48.6 %
Solar fraction building [SFnBd]15.3 %
Total annual field yield 52,458.5 kBtu
Collector field yield relating to gross area 160.5 kBtu/ft²/Year
Collector field yield relating to aperture area 176.1 kBtu/ft²/Year
Max. fuel savings 478 gal: [Heating oil]
Max. energy savings 61,737.1 kBtu
Max. reduction in CO₂ emissions 11,993.6 pound
Solar fraction: fraction of solar energy to system
[SFn]
Horizon line
Meteorological data-Overview
Average outdoor temperature 29.2 °F
Global irradiation, annual sum 318.3 kBtu/ft²
Diffuse irradiation, annual sum 123 kBtu/ft²
Financial analysis - Solar thermal
Purchase costs 37,900 USD
Life span 30 years
Proportional incentives 0 %
Incentives per area 0 USD
Fixed incentives 0 USD
Inflation 1.3 %
Interest 0 %
Increase of energy prices 5 %
Electricity 0.71 USD/kWh(el.); 0.71 USD/kWh
Heating oil 5.504 USD/gal; 0.043 USD/kBtu
Financial Report
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Vela Solaris AG, their distribution partners or SPF do not accept any liability for the correctness of the specifications and the results.
Financial analysis - Solar thermal
Effective purchase cost after grants 37,900 USD
Annual energy cost savings 2,630.671 USD
Solar energy cost per kWh 0.079 USD
Payback period 11 years
Present value of the system 217,731.5 USD
Net present value 179,831.5 USD
Component overview (annual values)
Boiler Oil boiler 50kW with internal pump
Power kBtu/hr 170.65
Total efficiency %83
Energy from/to the system [Qaux]kBtu 200,256.6
Fuel and electrical energy consumption [Eaux]kBtu 241,173.9
Energy savings solar thermal kBtu 61,737.1
CO₂ savings solar thermal pound 11,993.6
Fuel savings solar thermal gal 478
Collector North America Empire EC-40-1.5
Data Source SRCC
Number of collectors 8
Number of arrays 2
Total gross area ft²326.88
Total aperture area ft²297.945
Total absorber area ft²297.95
Tilt angle (hor.=0°, vert.=90°)°70
Orientation (E=+90°, S=0°, W=-90°)°0
Collector field yield [Qsol]kBtu 52,458.5
Irradiation onto collector area [Esol]kBtu 148,200
Collector efficiency [Qsol / Esol]%35.4
Direct irradiation after IAM kBtu 88,913.9
Building Multifamily house, low-energy building
Heated/air-conditioned living area ft²3,168
Heating setpoint temperature °F 70.5
Heating energy demand excluding DHW [Qdem]kBtu 210,162.8
Specific heating energy demand excluding
DHW [Qdem]kBtu/ft²66.3
Solar gain through windows kBtu 62,854.1
Total energy losses kBtu 297,676.9
Financial Report
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Vela Solaris AG, their distribution partners or SPF do not accept any liability for the correctness of the specifications and the results.
Convector Floor heating Floor heating
Number of heating/cooling modules -38
Power per heating module under standard
conditions kBtu/hr 3
Nominal inlet temperature °F 104
Nominal return temperature °F 95
Net energy from/to heating/cooling modules kBtu 210,055.5
Hot water demand Constant
Volume withdrawal/daily consumption gal/d 120.4
Temperature setting °F 120
Energy demand [Qdem]kBtu 31,177.1
External heat exchanger Fresh water station
heat exchanger Plate heat exchanger, medium size
Transfer capacity W/K 10,000
External heat exchanger Solar loop heat
exchanger Plate heat exchanger, large
Transfer capacity W/K 17,000
Pump Space heating loop pump Pump Eco, medium
Circuit pressure drop psi 3.055
Flow rate gpm 19.2
Fuel and electrical energy consumption [Epar]kBtu 145.3
Pump Fresh water station pump Pump Eco, small
Circuit pressure drop psi 0.063
Flow rate gpm 2.2
Fuel and electrical energy consumption [Epar]kBtu 6.3
Pump Tank Side Circulator Wilo-Stratos ECO 25/1-3
Circuit pressure drop psi 0.689
Flow rate gpm 4.7
Fuel and electrical energy consumption [Epar]kBtu 32.3
Pump Main Solar Circulator Wilo-Stratos 25/1-6
Circuit pressure drop psi 0.569
Flow rate gpm 5.7
Fuel and electrical energy consumption [Epar]kBtu 50.2
Financial Report
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Vela Solaris AG, their distribution partners or SPF do not accept any liability for the correctness of the specifications and the results.
Storage tank Buffer tank 2000gal US universal tank
Volume gal 2,000
Height ft 7.22
Material Enameled steel
Insulation Flexible polyurethane foam
Thickness of insulation in 4
Heat loss kBtu 5,598.7
Connection losses kBtu 1,522.3
Loop
Solar loop
Fluid mixture Propylene mixture
Fluid concentration %40
Fluid domains volume gal 17.3
Pressure on top of the circuit psi 58.016
Solar thermal energy to the system [Qsol]kBtu
Financial Report
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Vela Solaris AG, their distribution partners or SPF do not accept any liability for the correctness of the specifications and the results.
Heat generator energy to the system (solar thermal energy not included) [Qaux]kBtu
Solar fraction: fraction of solar energy to system [SFn]%
Total fuel and/or electrical energy consumption of the system [Etot]kBtu
Financial Report
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Vela Solaris AG, their distribution partners or SPF do not accept any liability for the correctness of the specifications and the results.
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Solar thermal energy to the system [Qsol]
kBtu 52459 1138 4326 8889 8464 6469 3902 3639 4368 5503 4007 1770 -18
Heat generator energy to the system (solar thermal energy not included) [Qaux]
kBtu 200257 41567 28027 18545 5968 674 0 0 331 6071 20836 34051 44185
Heat generator fuel and electrical energy consumption [Eaux]
kBtu 241174 49765 33676 22471 7415 923 0 0 439 7579 25199 40839 52869
Solar fraction: fraction of solar energy to system [SFn]
%20.8 2.7 13.4 32.4 58.6 90.6 100 100 92.9 47.5 16.1 4.9 0
Total fuel and/or electrical energy consumption of the system [Etot]
kBtu 241408 49794 33703 22499 7434 936 8 7 448 7594 25222 40866 52896
Irradiation onto collector area [Esol]
kBtu 148200 3524 11015 21020 20868 18731 15859 15530 13839 12618 9701 5496 0
Electrical energy consumption of pumps [Epar]
kBtu 234 29 27 28 20 13 8 7 9 16 23 27 28
Heat loss to indoor room (including heat generator losses) [Qint]
kBtu 50394 8756 6266 4689 2265 1222 1102 1209 1068 2235 5018 7385 9179
Heat loss to surroundings (without collector losses) [Qext]
kBtu 751 29 66 96 89 86 80 83 70 54 52 45 1
Total energy consumption [Quse]
kBtu 242810 41954 31653 26524 13191 5804 2726 2736 3861 11136 24160 35293 43771
Collector North America
Daily maximum temperature [ °F]
Financial Report
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Vela Solaris AG, their distribution partners or SPF do not accept any liability for the correctness of the specifications and the results.
Energy flow diagram