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--- Engineers Without Borders --- Marquette University & Northern Illinois University. Santa Cruz del Quiche, Guatemala Solar Powered Water Pumping System MARQU-S-Guat-00306 Phase 1 – Projected Travel January 2008. Casa Nueva Vida.

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engineers without borders marquette university northern illinois university
--- Engineers Without Borders ---Marquette University&Northern Illinois University

Santa Cruz del Quiche, Guatemala

Solar Powered Water Pumping System

MARQU-S-Guat-00306

Phase 1 – Projected Travel January 2008

casa nueva vida
Casa Nueva Vida
  • Casa Nueva Vida is a residential facility for the treatment of alcoholism and drug dependency located just outside of Santa Cruz del Quiche, Guatemala.
  • Each year 18 in-patients, 18 out-patients, approximately 90 family members, and 40-50 participants in an ambulatory recovery program benefit from the services and support of Casa Nueva Vida.
  • Currently, water is supplied to the center from a hand-dug well, which leads to concerns about reliability and cleanliness.
goals for the solar water system
Goals for the Solar Water System
  • The main goal of the project is to create a more reliable and cost-effective water system for Casa Nueva Vida.
  • Electricity in the area is unreliable and expensive creating water problems on site. Plus, the current water supply comes from a hand dug well which leads to certain health concerns.
  • EWB-Marquette along with EWB-NIU will work to place two DC pumps in parallel with the existing system: one down in the well and one much smaller pump above ground to provide water pressure throughout the site. Each pump will have its own DC power source in the form of mounted solar panels.
system
System
  • Water is…
    • Pumped from well using submersible pump
    • Collected in large underground tank
    • Pumped with an above ground pump from underground tank to distribution tank on roof
  • 2 subsystems of PV arrays/pumps:
    • At well
    • At upper holding tank
  • Will be installed in parallel with existing electrical system (to provide backup system)
solar panels
Solar Panels
  • 150SX BP Solar photovoltaic panels
  • 2 panels at upper tank
  • 6 panels at well
  • Team has used same model on past projects in Guatemala
the well pump
The Well Pump
  • Pump Model: Grundfos 11 SQF-2
  • Pump Type: AC submersible
  • Specs:
    • Helical rotor
    • Can provide 5gpm drawing 475W
  • Additional:
    • Grundfos pumps are sold in Guatemala (easy access to replacement parts if needed)
    • Durable submersible pumps, used in many applications in Guatemala
slide8

Well Mounting System

Materials: Structural Aluminum Bar, 1040 Steel Brackets, SAE Grade 8 Bolts

Expected Cost: $ 320.12 (USD) per system (McMaster-Carr)

Maximum Stress: 170.60 MPa

Design Overview: Analyzed for 110mph winds parallel to the ground, two of these mounting systems will hold 3 panels each to power the in well DC submersible pump. The panels are designed to sit .75 meters above the ground. An adjustable length rear pole varies the angle of the face of the panels from 15 degrees from the horizon to 30 degrees. All bolting and brackets will be fabricated and purchased in the US, while all poles will be purchased in Guatemala.

concrete design well panels
Concrete Design – Well Panels
  • Using a soft clay with c=12kPa, diameter=0.5m and depth=.8m is sufficient to provide 23.5kN of resistance; more than 3 times the largest load of 4848N
  • If soil is a very weak sand then an increased depth of 1.5m required to get ultimate strength of 15kN - 3 times the largest load of 4848
  • The well solar panel mounting system has significantly smaller forces & Foundation depth will follow calculations done to determine size of tank system foundation but should have a Q_u=5kN which is based on a factor of safety of 3.0 whereby it should be designed for 5kN

Well Solar Panel Mounting

System Forces

the ground pump
The Ground Pump
  • Pump Model: Conergy Solar Force 3020-24PV
  • Pump Type: AC piston pump
  • Specs:
    • 24 V AC
    • Suction capacity = 25 vertical feet
    • Can provide 5gpm drawing 202 W
  • Additional:
    • Team has used in previous pumping projects in Guatemala
    • Easy to maintain
    • Replacement parts can be fashioned (car timing belt instead of normal belt,leather gaskets, etc)
    • Durable, rugged design
slide12

Storage Tank Mounting System

Materials: Structural Aluminum Bar, 1040 Steel Brackets, SAE Grade 8 Bolts

Expected Cost: $ 386.06 (USD) per system (McMaster-Carr)

Maximum Stress: 77.20 MPa

Design Overview: Analyzed for 110mph winds parallel to the surface of the panels, a single mounting systems will hold 2 panels 2 meters above the ground, to power the storage tank pump. An adjustable central bracket varies the angle of the face of the panels from 15 degrees from the horizon to 30 degrees. All bolting and brackets will be fabricated and purchased in the US, while all poles will be purchased in Guatemala.

concrete design upper tank panels
Concrete Design – Upper Tank Panels

Tank Solar Panel Mounting

System Forces

  • Present soil conditions unknown
  • On site testing will be performed to determine soil type and unit weight (using ASTM D-1556 Sand Cone Method)
  • Design of foundation carried out for both weak sands and weak clays
  • Standard concrete will be mixed on site and placed in a circular cardboard concrete form tube (Trade name SonoTube)
water testing
Water Testing
  • Water quality testing will be carried out to aid in phase 2 (filtration) design / development
  • Water testing equipment:
    • Test strips for nitrate/nitrite and Ph
    • Portable turbidity meter
    • 3M Petrifilm to test for total coliform and e-coli
    • “Homemade” incubator made from a heating pad and suitcase
    • Watersafe kits (P/A coliform, lead, hardness, pesticides, etc)
community health assessment
Community Health Assessment
  • A health assessment will be carried out
  • Focus on water borne illnesses, common diseases, health issues in area
  • Will use health survey (already translated into Spanish) similar to those used in our previous Guatemala projects
  • 2 team members (1 speech path, 1 who speaks Spanish) will carry out with aid of nurses at Casa Nueva Vida
tentative travel team itinerary
Tentative Travel Team Itinerary
  • Travel Dates: January 2 – 11, 2008
  • Travel Plans:
    • Fly from Chicago to Guatemala
    • Private van for in-country transportation
    • Fly from Guatemala to Chicago
  • Lodging and meals will be provided by Caritas
  • Other Site Visits / Potential Assessments:
    • Tecpan, Guatemala – Fire station construction
    • Santiago Atitlan, Guatemala – water pumping system at orphanage
  • All EWB forms have been submitted
  • All team members are EWB-USA members
  • See Pre-Implementation report 507D for more information