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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
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

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
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
150SX BP Solar
photovoltaic
panels

2 panels at upper
tank

6 panels at well

Team has used
same model on
past projects in
Guatemala
Well Pump System
                   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
       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
                            Using a soft clay with c=12kPa,
                            diameter=0.5m and depth=.8m is
                            sufficient to provide 23.5kN of
Well Solar Panel Mounting   resistance; more than 3 times the
      System Forces         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
Upper Tank Pump System
                  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
 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

Tank Solar Panel Mounting   Present soil conditions unknown
      System Forces
                            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 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
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
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

				
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posted:12/5/2011
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