Description of Calculation Method Table : Variables for Low Pressure Irrigation Systems Component Type Value Source ACRES Variable Based on customer application EDC Data Gathering,1 Based on pre retrofit pressure PSIbase Variable EDC Data Gathering,1 measurements taken by the installer Based on post retrofit pressure PSIeff Variable EDC Data Gathering,1 measurements taken by the installer Based on pre retrofit flow GPM1 Variable EDC Data Gathering,1 measurements taken by the installer Based on pre retrofit flow GPM2 Variable EDC Data Gathering,1 measurements taken by the installer OPHRS Variable Based on customer application EDC Data Gathering DHRS Variable Based on customer application EDC Data Gathering MONTHS Variable Based on customer application EDC Data Gathering Variable Based on customer application EDC Data Gathering Look up pump motor efficiency based on the pump nameplate horsepower (hp) from customer application and Default 2 nominal efficiencies defined in Table 314. CF Fixed 0.0026 3, 4 Sources: Based on Alliant Energy program evaluation assumptions for low-flow pressure irrigation systems. Evaluation of Alliant Energy Agriculture Program, Appendix F, 2008. Table 314 contains motor efficiency values from NEMA EPACT efficiency motor standards by motor size and type. If existing motor nameplate data is not available, these tables will be used to establish motor efficiencies. The coincidence factor was only estimated for agricultural applications, and was determined by using the following formula: CF = . Pennsylvania census data was used to estimate an average . Pennsylvania Census data: Measure Life The measure life for low pressure irrigation systems is 5 years.
Description of Calculation Method Table : Variables for Low Pressure Irrigation Systems Component Type Value Source ACRES Variable Based on customer application EDC Data Gathering,1 PSIbase Variable Based on pre retrofit pressure measurements taken by the installer EDC Data Gathering,1 PSIeff Variable Based on post retrofit pressure measurements taken by the installer EDC Data Gathering,1 GPM1 Variable Based on pre retrofit flow measurements taken by the installer EDC Data Gathering,1 GPM2 Variable Based on pre retrofit flow measurements taken by the installer EDC Data Gathering,1 OPHRS Variable Based on customer application EDC Data Gathering DHRS Variable Based on customer application EDC Data Gathering MONTHS Variable Based on customer application EDC Data Gathering Variable Based on customer application EDC Data Gathering Default Look up pump motor efficiency based on the pump nameplate horsepower (hp) from customer application and nominal efficiencies defined in Table 314. 2 CF Fixed 0.0026 3, 4 Sources: Based on Alliant Energy program evaluation assumptions for low-flow pressure irrigation systems. Evaluation of Alliant Energy Agriculture Program, Appendix F, 2008. Table 314 contains motor efficiency values from NEMA EPACT efficiency motor standards by motor size and type. If existing motor nameplate data is not available, these tables will be used to establish motor efficiencies. The coincidence factor was only estimated for agricultural applications, and was determined by using the following formula: CF = . Pennsylvania census data was used to estimate an average . Pennsylvania Census data: Measure Life The measure life for low pressure irrigation systems is 5 years.
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