Electricity consumption calculations (Newton) Solar water heating system for Coliseum ́ s showers Evaluation and Analysis of Renewable Energy Projects in USFQ Paúl Chasiquiza, John Ochoa, Felipe Verdezoto. Renewable Energy Resources Criteria for energy generation (Newton) Results Water heating System for Coliseum showers The use of LPG to heat water causes air pollution , so to solve that problematic at the University a solar water heating system was proposed to determine the solar collectors needed to heat the water of the coliseum ’s showers For that purpose , it was necessary to estimate the daily use of the hot water and then calculate the energy to heat the water to a temperature of 55 ° C Once that was done , calculations were needed to determine how much energy a Viessmann Vitosol 200 - FM SV 2 F single flat plate collector can supply based on the GHI, ambient temperature and average sun hours at Cumbay á Once the energy that a single collector can supply to heat the water was calculated taking into account the total efficiency , it was possible to define the number of collectors needed and the area needed for the installation Finally , the costs of the project were compared with the costs related with the LPG based water heating system Hot water consumption 12718,98 L/day Energy to heat the water 724,34 KWh/day GHI at Cumbayá 5,74 KWh/(m^2 day) Collector's Efficiency 0,82 Capacity of a collector 11,85 KWh/day Number of Collectors 62 Solar Collectors Area required for the installation 153,44 m^2 Useful energy provided by the system 264384,57 KWh/year Costs of the LPG based system Tanks to supply the same energy 1376,41 LPG tanks/ year Cost of all the LPG tanks 4817,42 USD/year Capital cost of the solar collector system Purchasing costs 39221,07 USD Installation costs 1961,05 USD Total costs 41182,13 USD ROI 8,55 years PRODUBANCO S.A. Solar Panels Eolic Generator Biomass of Rice Hulls Time.Years 3 3 3 Loan Value $23.300,00 $20.040,00 $503.956,67 Mensuallities $857,00 $737,00 $18.516,00 Interest 1,23% 1,34% 1,23% Energy Saving [monthly] [kWh] 10699,44 10699,44 10699,44 Money Saving [monthly] $1.069,94 $1.069,94 $1.069,94 Devaluation per year 5,00% 5,00% 5,00% Return Value $20577 $17183,6 $451250 NPV $28.134,66 $29.057,23 - $177.374,69 Photovoltaic panels Data sheet EGE - 375M - 72 - FULL BLACK Pout Max [kW] 0,27961 Energy kWh per day 3,35532 Energy kWh per year 1224,6918 Number of Photovoltaic panels 114 Unit Cost $ $200,00 Installation Cost$ $500,00 Total Cost $ $23.300,00 Eolic Generator Data Sheet Ista Breeze i1000W Pout Max [kW] 1 Energy kWh per day 24 Energy kWh per year 8760 Number of Eoilic Generator 16 Unit Cos $ $1.190,00 Installation Cost$ $1.000,00 Total Cost $ $20.040,00 Biomass of rice hulls Rice Hulls HHV [J/kg] 16140000 Need mass [45kg] 691,33 Unit Cost $ $5,00 Biomass Generator $ $500.000,00 Installation Cost$ $500,00 Total Cost $ $503.956,67 Assumption : Office computers are on from 7 am to 7 pm, and it is assumed that the energy consumed ghostly is 5 W for computers Computers Building Office Laboratories Newton 13 168 Monday to Thursday Laboratories Office Power (W) 350 350 Daily use (s) 28800 43200 Ghost power (W) 5 5 Stand - by time (s) 14400 0 Weekly consumption (J) 6822144000 786240000 Friday to Sunday Laboratories Office Power (W) 350 350 Daily use (s) 28800 43200 Computers (5%) 8 1 Ghost power (W) 5 5 Stand - by time (s) 14400 0 Weekly consumption (J) 243648000 45360000 Lights Building Lights Newton 334 Weekly Office Classrooms Power (W) 30 30 Lights 111 223 Weekly use (s) 129600 194400 Total computers weekly consumption (J) 7.90E+09 Total computers weekly consumption (kWh) 2.19E+03 Total lights weekly consumption (J) 1.73E+09 Total lights weekly consumption (kWh) 4.81E+02 Total weekly consumption (kWh) 2.67E+03 Energy cost ($/kWh) 0.1 TOTAL WEEKLY COST ($) 267.49 We can appreciate that the great majority of the energy consumed in Newton Building is due to the use of computers in a week, as it represents the 82% of the total energy consumption. Assumption : Energy cost is $ 0 10 / kWh 3 - year term for debt In order to supply the required energy various proposals such as solar panels, wind turbines, and biomass are used. The capital costs of the aforementioned alternatives are detailed below for later evaluating which is the best option. After carrying out the analysis of the Net Present Value (NPV) for the three energy options for the Newton building and taking into account the depreciation of the machinery by 5% per year. It was determined that the most viable option is the mini wind farm because it represents the highest value. The case of biomass is not feasible since it only works for massive chains due to the investment cost.