Professional Skills Engineering Project: EWB Mayukwayukwa Camp

This project report details an Engineers Without Borders (EWB) project plan addressing critical health challenges in the Mayukwayukwa refugee camp, which serves approximately 8,000 individuals. The project focuses on four key areas: vaccine refrigeration without electricity, alternative equipment sterilization methods, the application of dust masks in a hammer mill, and the use of local materials for menstrual hygiene projects. The report emphasizes the importance of socially, economically, and culturally sensitive solutions to ensure the sustainability of the initiatives. The project investigates the use of solar refrigeration for vaccine storage, detailing technical specifications, performance, and the advantages of using evacuated vacuum tubes. It also explores alternative sterilization methods, including the use of solar autoclaves and rechargeable batteries. The report highlights the need for regular monitoring, standard operating procedures, and feedback to improve technology and ensure the long-term success of these engineering solutions within the community.

Running head: Professional skills
Professional skill of engineering
Name of the student:
Name of the university:
author note:

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Overview
The present report is the project plan put forward to reflect on Engineering
Application Ability pertaining to EWB project. The setting of the project is Mayukwayukwa
camp that provides services to near about 8000 individuals. The project would focus on four
primitive areas associated with health. The first project would be on refrigeration of vaccines
without the use of electricity. The second project would be on alternative methods for
equipment sterilisation. The third project would be on the application of dust masks for
people working in Hammer Mill. The last and fourth project would be on the usage of local
materials for menstruation projects of women. The projects outlined in the present report
would look into health perspectives from the point of view that is socially, economically and
culturally sensitive. Sustaining projects that have an association with the health of individuals
of the wider community is of much significance speaking on engineering grounds. Initiatives
can only be successful when they are sustainable and are not in a position to be abruptly
ended. For redefining the broader scopes of the project, economic and social sustainability
are kept side by side. Strategies are developed that ensure that the acceptance of the project
proposal is at all levels within the community. It is up to the community to understand the
capacity of the projects outlines to ensure their success. Financial, administrative, and
technical guidance and assistance are required for this (Price 2016).
There was only a clinic in the Mayukwayukwa camp which serves a total of 8,000 people of
the refugee camp. This clinic consist of four qualified staff, 19 of them were support staff and
one clinician. The clinic use to monitor every people and their problems. There were 15 to 50
people came to the clinic for their health problems, which includes diarrhoea, malaria,
pneumonia and other services such as birth of a child, post-natal care and the persons who are
suffering from HIV.

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This clinic mainly depends on solar energy and diesel generators used for the refrigeration of
immunizations and the utilization of the computer. However, right now there is insufficient
power to run different apparatus, which means that there is some medical apparatus in the lab
that can't be utilized. A case of the impacts of such control deficiencies can be found in the
water cleansing systems utilized at the centre. An electric sterilizer is accessible at the centre,
however can't be keep running because of lacking force supplies. However, hardware at the
healthcare clinic are cleaned utilizing a fire-controlled autoclave which is being heated on a
heater that is being controlled by a fire from wood or charcoal. The clinic gets its water
supply by running the pump. This pump can be run with the help of generator and it can be
done only once every day. At different circumstances, water must be gathered from a tube-
well situated outside the wellbeing centre. Gathering water utilizing the hand pump can take
up to 20 minutes during the dry season and is a significant applying movement for the
medical caretakers.
Project 2.1: Refrigeration of Vaccines without Using Electricity
In this part there is a description of storing the vaccines in the health clinic of
Mayukwayukwa refugee camp. A review has been conducted on different types of methods
that are available in the camp for the utilization of solar energy used for refrigeration. There
are various methods that can be used for the solar refrigeration such as desiccant
refrigeration, absorption refrigeration and adsorption refrigeration (McCarney 2013)
As there is no source of electricity in the refugee camp, so the solar energy is used to run the
refrigerator. These types of refrigerators are used to store the medicines and vaccines at their
required temperature for preventing the spoilage. Solar refrigerators were introduced for
reducing the use of kerosene or gas power that was previously used for refrigeration process.
In Solar refrigerator, the energy is converted to DC current by the help of solar cells, known

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as photovoltaic panel (Del Pero et al. 2015). These cells are the semiconductors which allow
the conversion of solar energy to direct current. The current which is generated is used to run
the compressor of the refrigerator. This current is used to run a DC motor attached to inverter
is used to convert the current for running the refrigerator.
Source: www.ijert.org
Solar refrigerators are commonly used by developing countries for helping the poor people
and reducing the harmful effects caused by the CFCs released by the refrigerator. Here in
this project it has been aimed to make the solar refrigerator effective, so that it can be used in
rural areas for the storage of medicines and vaccines without using high expenses.
Technical specification of solar refrigerator
The refrigerator used from solar energy has the ability to run on low costs and a longer life
than other cooling systems. The solar refrigerator was designed and evaluated by the
government of Australia. A PV panel was made which consist of three modules connected in
series for obtaining the required voltage.

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Source: www.energetica-india.net
Source: www.energetica-india.net
Performance of the system
The coefficient of performance is an index of performance of the refrigeration system. The
COP is the amount of cooling that is produced per unit of work of the refrigerator.
The performance of the refrigerator depends on the efficiency of the solar panel, which is the
ratio of the electrical power produced with the radiation. The energy consumed by the PV

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model depends upon two main components such as electrical and thermal. For the design and
construction the materials selected must be cost effective, précised, capability to run and must
be the best pathway. For exchanging the heat copper tubes were used and it was ensured that
the prototype of the industries and requirements is meant.
Installation was done at the clinic of Mayukwayukwa refugee settlement. In addition to that
other auxillary instruments were also used:
 K- type digital temperature indicator
 Water level pipe
In the operation of the refrigerator the transformer oil present in the evacuated vacuum
tube is heated up by the use of trapped solar energy. Due to difference in density the hot fluid
gets flow up to the manifold and the cold fluid flows down to the evacuated tubes. The
transformer oil that is heated flows to the heat exchanger through the copper tubes and the
heat gets transferred to the generator which helps to run the refrigerator.
For running the transformer three fluids were tested which could be used as thermal
fluid such as kerosene, palm oil and transformer oil. Among these it was decided that
transformer oil is the best way to run the refrigerators as its thermal conductivity is high as
compared to others. For rising the temperature of oil up to a level of 160℃ -190℃ a cabin
temperature of 15℃ - 5℃ was obtained from 9am to 12pm, when the sun is at its peak so
that it can absorb maximum energy and helps to raise the temperature up to 174.8℃. In
addition a backup heater is used with the system so that it can work in absence of the
sunlight.
A solar thermal system is being designed and in that to obtain low temperatures from
8℃ to 0℃ the temperature is being raised to 120℃ to 150℃. Although this design has

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various disadvantages, there are many advantages that are high and help the refrigerator to
work throughout the year. This model of using evacuated vacuum tubes for running the
refrigerator is the most effective as compared to others company.
Scope for the use of this type of refrigerator is to improve the design and development
of the solar evacuated vacuum collector. To reduce the size of the tubes so that it can be used
in the urban areas where there is a scarcity of space. This model could be used for the
manufacture of cold rooms that will help the farmers to store vegetables. It can also be used
as centralized air conditioning system for villages. The COP of the absorption system is
comparatively low that can be increased in future.
The result of the project will be a working prototype of an adsorption refrigerator
which had been designed for the rural application. The construction of the refrigerator is very
simple and it takes very less time to construct. Therefore it can be said that the performance
of solar refrigerators is sufficient for the storage of vaccine in very hot climate. This system
has been provided with appropriate equipment selection and proper installation. This type of
refrigerator is also aligned with the future policies for providing cooling facilities to the rural
communities and healthcare facilities (Brites et al. 2016). All the solar refrigerators must be
monitored in regular intervals and the standard operation procedures must be taught to the
authorities of the clinic by the installation team. Unusual temperature performance data
should be timely repair and to maintain the cooling of the refrigerator. Further the feedback
of the performance of the solar refrigerator must be given to the manufacturers so that they
could perform the diagnosis appropriately to improve the technology by identifying the root
causes.
Project 2.2: Alternative Equipment Sterilisation Methods

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The medical devices which are used in surgery must be sterilized for using. The
operation table in a clinic must be surrounded by a sterile zone. Visibility of the surgical
devices makes it easy to maintain and simplify the sterile area. But there are some clinics or
hospitals such as in Mayukwayukwa refugee settlement, where there is no electricity. In such
cases battery packs, rechargeable battery packs, are used to produce electricity which can
help in sterilization of the devices. Alkaline batteries are commonly used Sterilizing devices
but as the voltage is low so many of the products are designed with lithium primary batteries.
Figure 1: This NiMH battery pack is specially designed to survive sterilization in an
autoclave
Source: www.ecnmag.com
Details on rechargeable batteries for portable devices and all of them are common in
the medical word each of the rechargeable battery and mainly made of Nickel cadmium
which is having the lowest energy density but the rate capability is very powerful this is the
reason that are used in cordless Power Tools both in construction and Orthopaedic surgeries.
and Technology was introduced in 1991 and is the best method that is available today the
Lithium ion cell corporate very effectively between -20 degree Celsius and +60 degree
Celsius. the lithium ion battery required the greatest protection is inclusive thermal separated
and exhaust mint to release the internal pressure. it also requires an external circuit that
prevents over firing a voltage during charging and under-voltage during discharge. it also
contains a thermal sensor which prevents It from thermal explosion Hi were the appropriate
level of safety design into a lithium ion battery makes it the more attractive cell even when

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exposed to Extreme temperatures or chemical environment caused by the sterilization
procedures (Brites et al. 2016).
The sterilization option:
The most common sterilization method that is available in hospital is the autoclave
autoclaves are used in the dentist laboratories also. The autoclaves uses a high temperature to
form pressure which is used to sterilize the equipment the batteries of autoclaves can be
exposed to the extreme temperatures these tools and batteries can withstand the temperature
up to 137 degree Celsius and up to the pressure of 30 PSI of steam. These also have a battery
House enough runtime and power to complete the major Orthopaedic procedures.
In this part has been described about a new method for the state lization of medical
instrument using solar energy this technology provide safe and reliable stabilization of
surgical instruments without electricity (Sharma et al. 2017). The Solar autoclave uses of
parabolic solar concentrator along with the small boiler for collecting the solar energy and to
generate steam which is then transferred to an insulated pressure Vessel and an electronic
sterilization indicator.
Source: www.who.int

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To ensure that the 250 ml boiler and parabolic concentrator can generate the
appropriate amount of steam for 5 liters insulated vessel an experiment was done. The test
that were done showed that the system needs 2 concentrators to produce this amount of steam
stabilization indicator measures the temperature and activate the LED when the appropriate
pressure is reached (Neumann et al. 2013). The advantages of this type of solar autoclave
include:
 A solar concentrator and a vessel for reducing the volatility in solar concentration
shows
 The ability of the system 2 scale with additional solar concentrators
 The temperature modular electronics are used
 The design is easy for manufacturing and shipping
Development Solar oven 1 Solar oven 2 Solarclave
Sub assemblies 8 parts 5 parts 8 parts
Supply chain
complexity
100% local
materials
90% local materials
90% local materials;
100% local replaceable
parts
Assembly time 1 day 1 day 3days
Manufacture
training
7 days 8 days 10 days
User training 3 hours 3 hours 1 day
Volume Low Low High
Cost $300 $300 $400
Project 2.3: Dust Masks for People Working in the Hammer Mill

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Hammer mills have been installed for grinding maizes and turning into flour. The
process involves fine dust particles that fill in the workspace at the time of operation.
Inhalation of dust particles that is hazardous for the workers at the mills as they are prone to
developing long-term exposure. The present project would look at the production of dust
masks with the help of local materials for protection of the heath of the workers who work in
the mills as well as visit the mills.
A dust mask would be the flexible pad that is to be held over the mouth and nose by a
rubber band or elastic band for protection against dust that is encountered from the activities
carried out in the mill. Usage of the dust mask would be highly recommended as protection
can be gained at different levels. The masks would act as a more comfortable, lighter and
cheaper alternative to respirators. The mask would be used while working in the dusty
environment. Since the area under which the worker carries out their activities cannot be
filtered by extraction equipment and fume, the use of mask would be the best option. The
main features of the mask would be the prevention of skin irritation, the convenience of
usage, prevention from bacteria, easy to wash, best in quality made from local materials. The
mask would be used as a loose-fitting device creating a physical barrier between the wearer
and the possible contaminants in the environment. The masks would be designed in such a
manner that they would be able to bock dust particles very minute in size, splatter or splashes
that might contain germs, large particle droplets and other contaminants. The dust mask
would be a folding respiratory protection. It would be made resistant to clogging in time, as
tested by Dolomite dust. The purpose would be to provide the individual with increased
comfort while using it. The valve of the mask would be optional. The purpose of making the
mask folding would be easiness in wearing it and storing it appropriately. The mask would be
welded for improving and increasing the life of the mask. This would ensure that the mask is
used for a desirable time frame, making it cost-effective (Schneider 2016).

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The application of the dust mask implies that a set of regulations are followed for
ensuring that the usage is at an optimal level. The mask is to be changed on a frequent basis,
specifically when there is a discolouration noticed in the mask due to the accumulation of
particles. Since the airflow is reduced with the use of dust mask, it is significant that the
workers breathe in fresh air by taking breaks while wearing it. The valve would be helpful for
the workers in exhalation that assists breathing. In case an individual develops a heath
complication such as a headache or dizziness, he must immediately stop working and breathe
in some fresh air. It is the responsibility of the person to ensure that the mask fits in snugly.
In case the air is found to be leaking at the edges then a different mask is to be used. It is to
be kept in mind that a particular mask is to be work by only one person for minimising health
complications (Ramirez and O'Shaughnessy 2017).
Figure: Dust Mask (Quinlan et al. 2010)