Download - Solar power based thermoelectric cooling
SOLAR POWER BASED THERMOELECTRIC COOLING
GROUP MEMBERS:GANDHAR UKIDVEDEVENDRA KALKARKUNAL KULKARNI
ANKIT NAIK
Group number 1
GUIDED BY:PROF. V.V KULKARNI
FUNDED BY SAVITRIBAI PHULE PUNE UNIVERSITY
CONTENTS Objective of the project Hardware Assembly Project Expenditure Solar panel testing Test Results and Graphical Analysis Power modulator diagram Thermoelectric module and Testing Conclusion Future Development
OBJECTIVE• The primal motive of this project is aimed at improving
fuel economy of a vehicle by shifting part or complete thermal load on to the thermoelectric devices rather than the conventional compressor based systems.
• But practical considerations and limitations do not allow the entire load to be shifted onto the thermoelectric modules, thus this system is going to be more or less a supplementary system to the main compressor based system.
• The possible outcome of this project can improve fuel efficiency which can end up in drastic amount of saving in local (proprietary) or national economies.
HARDWARE ASSEMBLY
•FLEXIBLE SOLAR PANEL (255W 47.5V 6.87A ACTIVE AREA =0.9204 sq-m) •THERMOELECTRIC MODULE DETAILS:Model number:TEC1-12715Dimensions (mm):40*40*3.3Color:WhiteCouples:127Vmax (V):15.4Imax (A):15Max power consumption (watt):231 WattsTmax(degree Celsius):70cQcmax T=0(W):137WItem Net Weight:50 g•12V 30A POWER REGULATOR CIRCUIT•TEMPERATURE SENSORS•MEASURING INSTRUMENTS•LUX METER•RHEOSTAT
PROJECT EXPENDITURE
EQUIPMENT EXPENSE
255W FLEXIBLE SOLAR PANEL
Rs. 1,00,000
231W THERMOELECTRIC COOLER
Rs. 12,000
REGULATOR CIRCUIT + MISCELLANEOUS
Rs. 1,060
TOTAL Rs. 1,13,060/-
TESTING OF SOLAR PANEL
V-I CHARACTERISTICS CIRCUIT DIAGRAM
TEST RESULTS
Date: 2 December 2014 12.30 p.m.Solar intensity 1350 W/sq-mAmbient temperature 34.1⁰C
The maximum efficiency is observed to be 8.25%
GRAPHICAL ANALYSIS
0 5 10 15 20 25 30 35 40 45 500
1
2
3
4
5
6
0
1.72
2.53
3.54
4.54.9
I-V PLOT
Voltage (V)
Curr
ent
(A)
0 5 10 15 20 25 30 35 40 45 500
20
40
60
80
100
120
0
72.1581.2
93.599101.5105.6
100.035
1.47
P-V PLOT
Voltage (V)
Pow
er
(Watt
s)
POWER MODULATOR CIRCUIT DIAGRAM
ACTUAL CIRCUIT
12V 25A POWER REGULATOR CIRCUIT
THERMOELECTRIC MODULE
MODULE TESTINGTESTING WITH BOTH MODULESAmbient temperature=29⁰CFan Voltage=11.6VFan current=0.61AInput voltage to the cooler=12.15VInput current to the cooler=15.2AWattmeter reading of the cooler=160WVolume of the box=65*37*30 cm³=66500cm³
Temperature inside the box(⁰C)
Hot side temperature (⁰C) Time(min)
27.5 29 026 36.4 1.524.6 44.1 2.524 50.2 323.5 51.1 3.2522.9 52.0 422.5 52.4 4.2522 52.8 521.6 53.1 5.321.2 53.7 6.120.8 54.1 720.6 54.9 7.520.2 55.2 8.420 56 9.119.9 56.6 9.2919.8 57.1 10.0219.7 57.9 10.2319.6 58.1 10.4419.5 58.5 10.419.3 59.1 11.519.2 59.2 12.1919.1 59.2 13.2719 59.3 14.23
18.9 59.3 15.0118.8 59.3 15.4418.7 59.3 17.0818.6 59.3 17.4918.5 59.3 18.4718.4 59.3 20.1818.3 59.3 21.2218.2 59.3 25.00
Tim
e(m
in)
1.5 3 4 5
6.1
7.5
9.1
10.0
2
10.4
411
.5
13.2
7
15.0
1
17.0
8
18.4
7
21.2
20
5
10
15
20
25
30
Temperature inside the box when both modules are in operation
Temperature inside the box(⁰C)
2. TESTING WITH A SINGLE MODULE:Voltage to cooler=12VCurrent to cooler=8.4AInput power to cooler=100.8WFan voltage=11VFan current=0.59AAmbient temperature=24.8⁰C
Temperature inside the box(⁰C) Time(min)
24.8 0
24.2 1
23.7 2
23.2 3
22.7 4
22.3 5
21.9 6
21.6 7
21.3 8
21.1 9
21.0 10
20.9 11
20.7 12
20.6 13
20.5 14
20.5 15
20.4 16
20.4 17
Time(min)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 170
5
10
15
20
25
30
Temperature inside the box when only one module is in operation
Temperature inside the box(⁰C)
CONCLUSION• From the above results we can conclude that the reliability of the
peltier module available in India is less with unsatisfactory level of cooling.
• Thus more research is required in the cooling module design with high quality Peltier modules to be made available from U.S or Europe.
• If such changes are made than the rate of satisfactory results will surely increase with reliability.
• The general system is simple to design yet performance of the entire system is yet to be realized.
• Due to certain abnormalities we were unable to successfully interface the regulator circuit with the TEC and the solar panel.
• In addition to this, a 255W solar panel is insufficient to power an air conditioning system, especially in automobiles. Therefore, more research is needed in the development of efficient photovoltaic material.
• Furthermore, other factors like shading and effective mounting also hinder the performance of the PV system.
FUTURE DEVELOPEMENT
The prototype can be made compact by selecting as single TEC of higher power (.i.e. of 200W or more). It can be done by choosing a better cold side heat sink that has twisted channels or pipes for circulating the air for a longer time. As an alternative for normal axial fan used in this project, if a blower fans is selected, the cooling system would provide better airflow. Well-known TEC brands (.i.e. Melcor, FerroTECetc) must be chosen if there is only one high power TEC selected for the cooling system. Bigger hot side heat sinks have to be selected accurately based its calculated. thermal resistances for best cooling efficiency. With a single TEC, one hot side and a cold side heat sink a smaller personal TEC cooler which gives comfort can be fabricated and can be installed on roof for individual cooling by changing the airflow and some mechanical or electronics section modification, the TEC air cooling for car can be used for heating applications too. Research is being carried out into the development of efficient photovoltaic material such as thin film and multicrystalline cells. In addition to this, multiple junction solar cells have been known to vastly improve the performance of the system. It ensures that the majority of the solar spectrum is utilized.