Difference between revisions of "SPIS Toolbox - Estimate System Size and Costs"
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| − | The '''DESIGN 03-Pump Sizing Tool''' (Excel-based worksheet) can be used to select the type of solar pump. The tool includes a database of 100 solar pumps available on the market to allow for a pre-selection of the motor/pump unit by the agricultural advisor. | + | The '''[[:File:DESIGN_03-Pump_Sizing_Tool.xlsx|DESIGN 03-Pump Sizing Tool]]''' (Excel-based worksheet) can be used to select the type of solar pump. The tool includes a database of 100 solar pumps available on the market to allow for a pre-selection of the motor/pump unit by the agricultural advisor. |
The approximate cost of the planned PV system can be calculated by multiplying the country-specific average system cost [currency/kWp] and the calculated PV generator power (P <sub>peak</sub>). | The approximate cost of the planned PV system can be calculated by multiplying the country-specific average system cost [currency/kWp] and the calculated PV generator power (P <sub>peak</sub>). | ||
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The final design of the PV pump and irrigation system should be left to experienced system integrators who use computer-based system sizing and simulation tools such as COMPASS, WinCAPS and PVSYST, HydroCALC, GESTAR (See Further Reading, Links and Tools at the end of the Module). | The final design of the PV pump and irrigation system should be left to experienced system integrators who use computer-based system sizing and simulation tools such as COMPASS, WinCAPS and PVSYST, HydroCALC, GESTAR (See Further Reading, Links and Tools at the end of the Module). | ||
| − | An example of the design of a simple SPIS is part of the tool '''DESIGN 04-Case Study Mr Paolo'''. | + | An example of the design of a simple SPIS is part of the tool '''[[:File:DESIGN_04_-_Case_Study_Mr_Paolo.docx|DESIGN 04-Case Study Mr Paolo]]'''. |
Following this procedure, the principal analytical steps to support decision-making should be completed. The technical, agronomical and financial aspects of the possible SPIS configuration (and alternatives) should now be available. | Following this procedure, the principal analytical steps to support decision-making should be completed. The technical, agronomical and financial aspects of the possible SPIS configuration (and alternatives) should now be available. | ||
Revision as of 10:59, 9 June 2017
Introduction
The Toolbox on Solar Powered Irrigation Systems (SPIS) is designed to enable advisors, service providers and practitioners in the field of solar irrigation to provide broad hands-on guidance to end-users, policy-makers and financiers. Risks related to system efficiency, financial viability and the unsustainable use of water resources can thus be minimized. The Toolbox comprises informative modules supplemented with user-friendly software tools (calculations sheets, checklists, guidelines). read more
Modules and tools touch upon:
- assessing the water requirements,
- comparing the financial viability,
- determining farm profitability and payback of investment in SPIS,
- sustainably design and maintain a SPIS,
- highlight critical workmanship quality aspects,
- and many more.
Estimate System Size and Costs
Proper sizing of the components of an SPIS is critical,since an SPIS with insufficient capacity will not satisfy the farmers’ needs and an over dimensioned system will induce unnecessary operation and capital costs. Negligence of the sustainable water yield of water sources may result in water shortage and a depletion of water resources, thus having negative impacts on the farm budget and the environment.
The required size of the PV generator can be estimated using the following parameters:
- daily crop water requirement Vd [m3/day]
- total pumping head HT [m]
- mean daily global solar radiation G for the design month [kWh/m2day].
A simple arithmetic formula that takes the individual system component efficiencies into account can be used to estimate the required solar-generating peak power
P peak [Wp].
|
Example: It is calculated that crops in an irrigation system require 30 m³/d and field observations confirm that water needs to be pumped up 50 meters from a borehole to a reservoir. From the NASA website it becomes clear that the daily total global irradiation at the location of the farm is 5 kWh/m²day. According to this equation, a 2.4-kWp PV generator is required. |
The DESIGN 03-Pump Sizing Tool (Excel-based worksheet) can be used to select the type of solar pump. The tool includes a database of 100 solar pumps available on the market to allow for a pre-selection of the motor/pump unit by the agricultural advisor.
The approximate cost of the planned PV system can be calculated by multiplying the country-specific average system cost [currency/kWp] and the calculated PV generator power (P peak).
The final design of the PV pump and irrigation system should be left to experienced system integrators who use computer-based system sizing and simulation tools such as COMPASS, WinCAPS and PVSYST, HydroCALC, GESTAR (See Further Reading, Links and Tools at the end of the Module).
An example of the design of a simple SPIS is part of the tool DESIGN 04-Case Study Mr Paolo.
Following this procedure, the principal analytical steps to support decision-making should be completed. The technical, agronomical and financial aspects of the possible SPIS configuration (and alternatives) should now be available.
Outcome/Product
- Required PV generator size;
- Pre-selection of motor/pump unit;
- Motor/pump characteristics;
- Layout of water distribution system;
- Daily course of solar irradiation and water flow;
- System cost estimate;
- System cost parameters;
- Suitability checklist / evaluation.
Data Requirements
- Daily crop water requirement Vd [m³/day];
- Total pumping head Ht [m];
- Mean daily global solar radiation G for the design month [kWh/m²day];
- Country-specific costs of PV pump [Currency/kWp].
People/Stakeholders
- Agricultural service providers;
- Experienced system integrators.
Important Issues
- A commercial software solution that integrates design for the PV pump and the irrigation system is currently not available on the market.
- SPIS usually have to be oversized to meet these peak demands, resulting in a fairly low degree of system utilization.
