HOMER-Software-Training-Guide-.pdf

For this example we will opt to split the load by bts

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For this example we will opt to split the load by BTS and MW/Cooling equipment. By clicking on the icon for Primary load 1 set the load to DC and define the hourly profile as indicated in the diagram below. The scaled annual average of the compbined primary loads should be 30.5 kWh/d. In our example add a sensitivity analysis of 27.5 kWh/d and 33.5 kWh/d. The random variability parameters should be set to 0% in case of accurate power load measurements. Primary Not-critical Load (BTS) The second primary load should also be defined as DC with a constant load of .350 kW throughour the day. The random variability parameter should be set to 0% as it was for the first load defined. Primary Critical Load (MW)
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Step 4 Wind and Solar Resources Introduction 5 Diesel Price Objective 6 Economics 1 Downloading the Software 7 Equipment 2 Defining the Power System 8 Calculating Results 3 Defining the Site Load Green Power for Mobile Resources 4 Wind and Solar Resources Wind Resources: Wind resources are determined using the NASA Surface Meteorology and Solar Energy database ( ) considering the wind direction at 50 metres above the surface of the earth. The database provides the monthly wind speed averaged for that month over a 10-year period (July 1983 - June 1993). Each monthly averaged value is evaluated as the numerical average of 3-hourly values for the given month. Not all locations are suitable for the installation of effective wind turbines. The annual wind speed average could be a good indicator of the suitability of the installation of a wind turbine in a given location and generally values above 5m/s with few months below 4 m/s are considered adequate for satisfactory results. For this example we will use a hypothetical site coordinates of latitude 11 36”S, longitude 40 25”. Log into the NASA Meteorology website from the URL above and enter the coordinates and select the annual wind speed average. Once the data is received click on the Wind Resource icon in HOMER and enter the monthly wind data as indicated below. The Altitude and Anemometer Height should be filled with the appropriate information from the NASA website. Wind Speed Continued:
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Step 4 Wind and Solar Resources Introduction 5 Diesel Price Objective 6 Economics 1 Downloading the Software 7 Equipment 2 Defining the Power System 8 Calculating Results 3 Defining the Site Load Green Power for Mobile Resources 4 Wind and Solar Resources Solar Resource: Solar resources are imported directly by HOMER from the NASA Surface meteorology and Solar Energy database by entering the GPS coordinates. Using the coordintes from the Wind Resource section, the annual solar radiation of this area is 5.14 kWh/m2/d. For this area the monthly solar radiation show a more constant trend than the wind speed. It is advisable that the average radiation should have a constant trend and the annual radiation be above 4 kWh/m2/d in order to have a reliable source of power coming from the photovoltaic panels.
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