design of cooling system for extracting water from humid air
DESCRIPTION
AN –NAJAH NATIONAL UNIVERCITY FACULTY OF ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERIG. Design of cooling system for extracting water from humid air. Prepared by : Afeef Nabulsi Oday Amouri Oday Humaid Said Ahmad. Supervisor: Dr.Abd-Alrahim Abusafa. Contents. General background. 1. - PowerPoint PPT PresentationTRANSCRIPT
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LOGO
Design of cooling system for extracting water from humid air
Design of cooling system for extractingwater from humid air
AN –NAJAH NATIONAL UNIVERCITYFACULTY OF ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERIG
Prepared by:Afeef Nabulsi Oday AmouriOday Humaid
Said Ahmad
Supervisor:Dr.Abd-Alrahim Abusafa
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Contents
General background 1
Problem definition 2
What is our project ?3
System objective and target area
4
Design of the system
Design of prototype6
2
3
4
5
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General background
Made from water every living thing.
Water is a liquid at standard ambient temperature and pressure, but it often co-exists on Earth with its solid state, ice, and gaseous state, steam (water vapor).
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• Water covers 71% of the Earth's surface• Only 2.5% of the Earth's water is freshwater,
and 98.8% of that water is in ice and groundwater deep to 2000 m under ground
• approximately one billion people still lack access to safe water
• By 2025, 1.8 billion people will be living in countries or regions with absolute water scarcity.
• In 2030, 47% of world population will be living in areas of high water stress.
General background
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Problem definition
Our world suffering water deficiency because of increasing in population, and depletion of the natural resources.
dryness in Middle East , because of water pollution, and lack in water resources
Israeli occupation prevents Palestinian people from their water resources
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Problem definition
Consumption Settlers : Palestinians
4 .5 : 1
Israel pumps around 500
600 MQM/year
100 MQM remains for Palestinians
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Because there is a continuous decrease in the water-generating sources
it was necessary to create the water from another way,
and this is what will be explained through this project.
Problem definition
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What is our project ?
system which can solve the problem in loses water, and find other resources which can give us more liters of water
A device that extract water from humid air.
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What is our project
Its an environmental project, because the system powered by Renewable energy, we use solar energy to operate the device.
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System objectives
* Design advice that extracts water from humid air.
• Minimize the power required for the operation by designing a series of energy recovery equipment such as heat exchangers.
Calculate and optimize the required PV-battery system to provide the necessary energy from a renewable source.
• Operate the system after construction to provide water with quality of water according to the specifications of the World Health
Organization.
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Design
Design
Depend on
Temperature Humidity
Solar radiation
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Target Area
Gaza strip
has a problems
with water
useful Geographical location for
project humidity,
temperature
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Target Area
average temperature is around 25ºC.
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Target area
average humidity ratio is around 70 %.
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What is our goals ?
After design the project
is to produce 400 liter/day
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What is our goal ?
Mass flow rate of air :Depend on cooling the air from
25ºC to 5ºC mW=ma(h1-h2)
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Parts of device
Design of fan
1• Air flow 1 m3/s
2• Blower fan
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Parts of the system
Basic refrigeration cycle
• Wc =15 Kw depending on suppose C.O.P =3.5
Power that
Refrigeration cycle
need
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Parts of the system
steps we followed to design the system
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Parts of the system
Heat exchanger design
How the heat exchanger reduce the power consumed by the Refrigeration cycle ?
Shell tube Heat exchanger .Plate Heat exchanger.Rotating wheel Heat exchanger.
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Parts of the system
Heat exchangerRotating wheel Plate Shell tube
Pressure drop low medium medium
Parts movement Rotate fixed fixed
size medium Large volume Very long tubes
recovery efficiency
75 %Heat storage core
60 % 50 %
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Parts of the system
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Refrigeration cycle with heat exchanger • Wc= 8 KW
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Parts of the system
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Refrigeratio
n cycle with heat
exchanger
• Wc= 8 KW
After allowing the cold air to
Passes through the
condenser
• Wc =2.288 KW
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Parts of the system
cooling capacity
(W).
overall heat transfer
coefficient (W/(m2 K)).
mean temperature difference
between the fluids (K).
The main factor s affect the design are:
Evaporator & condenser Design
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Parts of the system
the length of evaporator 35.4 m at diameter 1cmThe length of condenser 21.1 m at diameter 1cm
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Parts of the system
1
The total energy that the system
need 3.018Kw
2
2.288 Kw compressor,
0.55 KW Fan,
0.18KWRotating wheel
3
more advanced research could handle Power
generation and refrigerator cycle
by renewable energy
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Prototype Design
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Parts of the device
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Parts of device
Design of fan
1 •Air flow ? m3/s
2 •centrifugal fan
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What is our goal ?
Mass flow rate of air :Four levels
89 CFM115CFM139CFM252CFM
Depend on cooling the air from 25ºC to 17ºC 32
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temperatures
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1 2 3 40
5
10
15
20
25
30
35
40
45
89 CFM115 CFM139 CFM252 CFM
Room evaporator heatexchanger con -denser
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Refrigeration cycle
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Vapor Compression
Cycle
Refrigeration gas R410-a
coefficient of
performance
medium
3
Parts Cost simple
Source of energy electrical
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Parts of the system
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Heat exchanger design
Plate Heat exchanger
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Parts of the system
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Heat exchanger
Plate
Made from Tin Alloy
Pressure drop medium
Parts movement fixed
size 11 m2
recovery efficiency 35 %
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flow Heat capacity (k
Watt)
At full flow 2.038
At Three-
quarters full flow
1.669
At half full flow 1.436
At quarter full
flow
1.514
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Parts of the system
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flow Evaporator heat capacity (k
Watt)
At full flow 0.99156816
At Three-quarters full flow 1.31098604
At half full flow 1.0702692
At quarter full flow 1.05248
Condenser heat
capacity(kW)
0.29423064
1.15786944
1.1156805
1.136982
Evaporator & condenser Design
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Energy efficiency ratio
0.5
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Parts of the system
Basic refrigeration cycle
Power that
Refrigeration cycle need
•WC 0.57 kw with C.O.P 0.5
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Parts of the system
1
The total energy that the system need
1.078kW
2
0.572 Kw compressor, 0.5 KW
Fan
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Why We design a prototype for the project wasn't in conformity with
the original design
&Lack of Funding
lack of some of the required pieces in the local market
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The cooling cycle that we have used is a cycle of a normal air conditioner
so the lowest possible temperature we can get
here is
16 degree 5 degree
Whereas the required temperature is
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The original evaporator of the cycle was changed because of the Inconvenience with the design ,
So that reduced the circuit’s ability in refrigerating.
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As a result of decreasing the cycle ability in refrigerating, we had to minimize the air flow into the cycle by using a mechanical gate which was placed on the blower’s suction instead of using an inverter –because of the high cost of the last one- in order to control the flow.
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The area of the heat exchanger we have used is small and the distances between each plate and the other is large because the manufacturing capacity is limited in the market .This heat exchanger is not available in the local market as well as the required specifications , while importing from abroad is difficult due to the costs.
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Heat exchanger was manufactured from tin alloy which is considered to be a low-conductivity material respect to the conductivity of the materials that the exchanger is always made from, but the selection of tin alloy was due to its low price. Unfortunately that affected the results, so we didn’t get the exact desired results.
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Finally, as a result of using the centrifugal blower, we have obliged to design a duct that led to high pressure drop, and thus reduced the flow volume of 1480CFM to 252CFM, then increasing the motor burden leading to increase the consumed energy too.
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Recommendation
The results that we reach were not already achieved theory, to be:
At the first, axial blower recommended using to decrease pressure drop to minimum, and the duct forms should be funnel-shaped not square shape.
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On the other hand, the alloy used to manufacturing heat exchanger should be copper alloy its better than tin alloy to rise the efficiency of heat exchanging, but the rotary wheel heat exchanging is much better than the plate one, it has more efficiency and smaller size.
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The evaporator should replace with a large one and use a different refrigeration cycle using R-134a refrigerant that will make the temperature drop to 5°C to condensate the maximum amount of water.
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LOGO