• Swaziland is a small country, in Southern
Africa, bordered by South Africa and
Mozambique.
• Population: 1,185,000
• The head of state is the king, currently
King Mswati III
• Most Swazis live in rural homesteads,
the principal occupation is either
subsistence farming or livestock herding
• Swaziland ranks as a lower middle income country, but it's estimated that
69% of the population lives in poverty
• Swaziland is critically affected by the HIV and AIDS pandemic, and has
the highest HIV infection rate in the world (26% of all adults)
• Tuberculosis is also a significant problem, with an 18% mortality rate
• Swaziland has the lowest life expectancy in the world at 31.88 years
PALFRIDGE COMMITMENT
Exploring future
refrigeration technology in
synergy with nature
THE NEED FOR A
SUSTAINABLE SOLUTION
FOR REFRIGERATING
VACCINES , FOOD AND
BEVERAGES IN
DEVELOPING COUNTRIES
GTZ Terms of Reference
To preserve medicine , food & beverages for
human consumption at high ambient temperatures
( 48°c ) using solar energy without the use of
chemical storage batteries.
Key Design Criteria
• Sustainability
• Simplicity
• Safety
• Reliability
• Robustness
The Solar therm Range
Commercial
Merchandiser
(LC 86)
Domestic Unit
(LS 150)
Medical Unit
(MC 72)
Operation of the Solar therm Units
• During sunlight hours, energy from the sun is
converted into electrical energy, which is used
to cool the product. Any excess energy is
stored in a ballast load ( Phase Change
Material ) and is used during low light & low
energy conditions.
• The cooling system has no battery storage
and comprises of the refrigerator and 2 x 90
watt Photovoltaic panels
Operating Principles
VACCINE
COMPARTMENT
(2°C – 8°C)
ICE PACK
COMPARTMENT
(-18°C)
COOLPLATES
VACCINE
STORAGE
BASKET
ICE PACKS
REFRIGERANT
COIL
DAMPERS
BALLAST LOAD
MC72-Medical Unit
• This equipment is designed for
hospitals, clinics, and
ambulances. This Chest Type unit
comprises of two compartments:
-Vaccine storage
-Freezer compartment.
• A mechanical damper regulates
the amount of cooling and keeps
it between 2°C and 8°C.
• The dampers and controller are
preset to achieve optimum
vaccine temperatures in all
ambient temperature conditions.
• Ample insulation also allows for
vaccines and medicines to be
safely stored for extended periods
of time in low light conditions.
Performance Characteristics at 48°C ambient
and 75%Rh
LC86-Commercial Merchandiser
• This is a commercial
merchandiser comprising of
controller and BD35k compressor.
Beverages are stored in a basket
suspended from the top of the
cabinet.
• The unit has a ballast load. The
remainder of the space is filled
with product. The controller is preset to achieve optimum beverage
temperatures in all ambient
temperature conditions.
Performance Characteristics at 48°C
ambient and 75%Rh
LS150-Domestic
• This unit is designed for the
storage of fresh food, and is
aimed primarily at rural
homesteads and areas with
intermittent power supply from the
national grid.
• It is a single door design with
separate fridge and freezer
compartments that are able to
maintain temperatures from 2°C
to –9°C.
• Ample insulation also allows for
food to be safely stored for
extended periods of time in low
light conditions.
• The controller is preset to achieve
optimum fresh food temperatures
in all ambient temperature
conditions.
Performance Characteristics at 43°C
ambient and 75%Rh
COST OF REFRIGERATORS
MODEL
LC 86
Merchandiser
MT 150
Domestic
MC 72
Medical
BOS
Items
2 x 90w panels
10m x 4mm² Cable
Mounting Brackets
Elect. Plugs & Acc.
2 x 90w panels
10m x 4mm² Cable
Mounting Brackets
Elect. Plugs & Acc.
2 x 90w panels
10m x 4mm² Cable
Mounting Brackets
Elect. Plugs & Acc.
Ice Packs
BOS
Cost - €
Refrigerator
Cost - €
Total
Cost - €
550
808
1358
550
924
1474
550
1089
1639
TESTING & APPROVAL
Two phases viz
• Laboratory – as per WHO PQS specs –
Simulated Load & Power supply to unit.
• IEC 60335 1/2/24 – Safety Specs.
• SANS 15502 – Performance
• CE Declaration
• Field operation – tested in situation at various
countries in both hemispheres in all ambients.
- Refrigerator performance data collected
using remote radio link.
Data Collection
• Performance data ( temperature & power
consumption ) is logged electronically.
• Alarms ( door open etc ) also logged.
• Data is transmitted daily via the telephone
network to a website.
• The website collates the data from all the
various loggers worldwide and presents it in a
readable pictorial format.
• Anyone can ascess the website and review
the test data.
Communication & Global Positioning
• Data is transferred via GPRS or MMS –
Simply Cellular network.
• Data is transferred to a satellite via APRS and
the location is transmitted to the website.
• Palfridge has the co-ordinates of every
refrigerator and know its operating status !!!!
Installation & Maintenance
•
•
•
•
•
•
Accessory Specs
2 x 90 watt monocrystalline panels.
Roof mounting brackets and fixtures.
Intermediate 4mm² x 10m cable and plug.
Solar panel placement directions.
Operating Instructions.
Spare parts exploded view and ordering info.
Installation Procedure
1.Open the cover with
a screw driver.
4. Lift clip using screw driver,
push cable in and release
clip.
2. Undo nylon screw cap
and insert cable
5. Screw back nylon cap to
tighten cable. Repeat
procedure for connecting
other polarity.
3. Insert and push cable
6. Close cover
Installing Fridge to Solar Modules
Male Hella
Female Hella
Connect male hella to female hella
Installing Fridge to Solar Modules
Male Hella
Female Hella
Connect male hella to female hella
Wiring Schematic with Data Logger
Spare Parts
The following components are replaceable
SPARE PARTS WITH STOCK CODES
Component
Model
Compressor
Fan
Damper
Gasket
Controller
Hinge
MC72
010085
073120
909275
131005
071760
150005
LC86
010085
073120
-
131005
071760
150005
LS150
010085
073120
-
130017
071760
-
Compressor
Condenser
Gasket
Hinge
Fan
Electronic
Controller
Troubleshooting Guide
FAULT
POSSIBLE CAUSE
REMEDY
Compressor is not
running, and the ice
packs are not cold
Be patient, it is most likely that the
compressor will start within a few
minutes
if this is not the case, check the
following:
-check that power is connected and
that the wire from the solar panel to
the appliance is intact.
-if the above is OK, call technical
supervisor.
Ensure unhindered air circulation.
Compressor is running,
and the temperature is
too high
The ventilation grill is blocked.
Ensure that the lid is closed properly.
The lid is not closed properly.
Check that the fan is running, if not
it should be replaced.
The fan in the compressor
compartment is blocked or defective.
The temperature in the room in which
the appliance is installed is too high.
shield the appliance against direct
sun light and ensure more ventilation
to the room.
Temperature in solartherm is too low
The internal lid is not placed properly.
Ensure that the internal lid is placed
correctly.
No temperature is
displayed
The display battery is flat.
Change the battery. See section:
service