Retscreen method used to estimate overall heating needs and costs.

Transcription

1 Retscreen method used to estimate overall heating needs and costs. This method was used based on resent past data collections as well as current known data and was prepared on 12/10/09 for the City of Kendrick Idaho. Refer to attached pages : Heating Project section The attached page 1 data is area specific data provided by the program. The attached page 2 data is entered as followed The following model represents two simultaneous scenarios, a base case and a proposed case. The base case uses no solar and heats entirely with propane gas. The proposed case uses solely solar energy June-Aug. In both cases (specifically the proposed case), propane is used for initial heat-up (mid to late May). Both Cover Usage (16 hrs/day). Both 78 degrees is the desired temperature. Both Makeup water is estimated at %5 /week (assumes no leaks). Both Set wind to 5% due to Pool location. Both Set shading 42% (see Retscreen shading model data) for base case and 39% for proposed (39% yields an estimated 0 fuel cost June-Aug). Pool usage 100% June-Aug. Both Supply water temperature records indicate approx. 52 degrees (min) June 15th. Both Software model estimating supply temperature (max) should be around 60.3 degrees late Aug. Both Software model indicates best solar energy collection with panels at 12 degree slope. iheat panels calculated and estimated to match Fafco Sunsaver ST panels at total approximate cost $980.

2 iheat spiral panel square area approx. 28 ft^2. iheat estimated efficiency coefficients. 14 iheat solar spiral panels. Overall area required 392 ft^2 Software model estimates 25.4 kw capacity. Software model estimates miscellaneous loses. Software model estimates power needed for pump. Cost for electricity at $.10/kWh. Fuel required for base case and proposed case (June-Aug) Financial Analysis section Proposed case. Initial cost of panels $980 Propane furnace $2500 Fuel cost proposed case (electricity for pump) $72 Initial heat-up (mid-late May) cost. 314 gal of $2/gal = $630 (314 gal * BTU/gal = 28,000,000BTU) Annual total $702 Base case. $549 (Jun-Aug) propane, Initial heat-up (mid-late May) cost. 314 gal of propane.@ $2/gal = $630 (314 gal * BTU/gal = 28,000,000BTU) Annual total $1179 Graph shows system pay for itself in 6.5 years

3 Clean Energy Project Analysis Software Project information Project name Project location See project database Prepared for Prepared by Project type Technology Analysis type Heating value reference Show settings Heating Method 1 Higher heating value (HHV) Site reference conditions Climate data location Select climate data location Lewiston Nez Perce Cnty A Show data Unit Climate data location Project location Latitude N Longitude E Elevation ft 1,434 1,434 Heating design temperature F 16.7 Cooling design temperature F 93.7 Earth temperature amplitude F 39.9 radiation - horizontal Month Air temperature Relative humidity Atmospheric pressure Wind speed Earth temperature Heating degree-days F % kwh/m²/d kpa mph F F-d F-d January % February % March % April % May % June % July % August % September % October % November % December % Annual % ,897 2,764 Measured at ft Cooling degree-days Complete Energy Model sheet RETScreen Minister of Natural Resources NRCan/CanmetENERGY _3.xls

4 RETScreen Energy Model - Heating project Heating project Technology Load characteristics Application Swimming pool Hot water Unit Base case Proposed case Type Outdoor Area ft² Cover use h/d Temperature F Makeup water %/w 5% 5% Wind sheltering - season of use % 5% 5% Solar shading - season of use % 42% 39% Percent of month used Month January February March April May June 100% 100% July 100% 100% August 100% 100% September October November December Supply temperature method User-defined Water temperature - minimum F 52.0 Water temperature - maximum F 60.3 Unit Base case Proposed case Energy saved Heating MWh % Incremental initial costs Resource assessment Solar tracking mode Fixed Slope 12.0 Azimuth 0.0 Show data radiation - horizontal radiation - tilted Type Unglazed $ 980 Manufacturer Model Fafco Sunsaver ST Gross area per solar collector ft² Aperture area per solar collector ft² Fr (tau alpha) coefficient 0.81 Wind correction for Fr (tau alpha) s/ft Fr UL coefficient (Btu/h)/ft²/ F 3.95 Wind correction for Fr UL (Btu/ft³)/ F Number of collectors 14 6 Solar collector area ft² Capacity kw Miscellaneous losses % 3.0% See technical note See product database Balance of system & miscellaneous Heat exchanger yes/no No Miscellaneous losses % 4.0% Pump power / solar collector area W/ft² 5.00 Electricity rate $/kwh Summary Electricity - pump MWh 0.7 Heating delivered MWh 4.6 Solar fraction % 100% Heating system Project verification Base case Proposed case Energy saved Fuel type Propane - gal Propane - gal Seasonal efficiency 85% 85% Fuel consumption - annual gal gal Fuel rate $/gal $/gal Fuel cost $ kendrick - Outdoor.xls

5 Emission Analysis Base case electricity system (Baseline) factor (excl. T&D) T&D losses factor Country - region Fuel type tco2/mwh % tco2/mwh United States of America All types % Base case tco2 1.6 Proposed case tco2 0.4 Gross annual reduction tco2 1.2 GHG credits transaction fee % Net annual reduction tco2 1.2 is equivalent to 0.2 Cars & light trucks not used GHG reduction income GHG reduction credit rate $/tco2 Financial Analysis Financial parameters Inflation rate % 2.0% Project life yr 20 Debt ratio % Initial costs Heating system $ % Gas Heater $ 2, % Total initial costs $ 3, % Incentives and grants $ 0.0% Cumulative cash flows graph Annual costs and debt payments O&M (savings) costs $ Fuel cost - proposed case $ 72 Initial heat up fuel cost $ 630 Total annual costs $ 702 Annual savings and income Fuel cost - base case $ 549 Intial heat up fuel cost $ 630 ive cash flows ($) 10,000 8,000 6,000 4,000 2, ,000-4,000-6,000 kendrick - Outdoor.xls