An experimental analysis of specially
designed PV absorber surface on
performance of hybrid solar system

Name : V N Palas...
Quick glance of presentation:
1) Introduction
2) Experimental

3) Equations used to calculate various parameters
4) Result...
1) Introduction
A. Voltage generated by commercial PV module was found decreasing by
0.065 to 0.085 V/ 0C rise in its temp...
2) Experimental
2.1) Special flow Aluminum PV absorber heat exchanger

surface design with fabrication.
2.2) Fiber Glass w...
2.1 ) Heat exchanger surface design with fabrication
mounted at back side of PV module.

Fig. 1 Installation of an oscilla...
2.2) Fiber Glass wool insulation fitted at back side of
heat exchanger.

Fig. 2 Setting up glass wool at rear side of an o...
2.3) Complete assembly of hybrid PV/T solar water
system with all measuring instruments.

Fig. 3 Hybrid (PV/T) solar water...
2.4) Experimental observations
A) All experiments were conducted during month of May-13 and
slope of PV module was kept at...
E) Inlet and exit water temperatures from hybrid system were
recorded to calculate thermal power for every 30 minutes of
t...
3) Equations used to calculate various
technical parameters.
PPV = V * I

(1)

PT = m * Cp * (Twe –Twi )

(2)

IG = IGn * ...
4) Nomenclature and Greek symbols.
V

:

Voltage produced by PV module at ATC conditions (V)

I

:

Current produced by PV...
5) Result and Discussion
5.1) Performance of un-cooled commercial PV module:
A. The highest voltage and current produced b...
5.2) Performance of hybrid PV/T solar water system:
A.

After cooling, open circuit voltage and working voltage were
found...
Voltage (V)

36
32
28
24
20
16
12
8
4
0

Vuncooled
Vcooled

09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14...
Photovoltaic output Power (W)

180.0
160.0
140.0
120.0
100.0
80.0
60.0
40.0
20.0

Ppv-uncooled
Ppv-cooled

0.0
09:00 09:30...
Top side PV Module temperature (0C)

70.0
60.0
50.0
40.0
30.0

TTPV-uncooled

20.0

TTPV-cooled

10.0
0.0
09:00

09:30

10...
5.3) Performance comparison of simple PV module and
hybrid PV/T system at ATC condition:
Sr. Technical parameters
No

Simp...
6) Conclusions
A) After converting

simple PV module to hybrid PV/T

system, PV electrical power and efficiency of water
c...
D) The performance ratio of PV module of hybrid PV/T

system was increased by 11% because of cooling effect.
E) On yearly ...
Thank you !
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48 deshmukh

  1. 1. An experimental analysis of specially designed PV absorber surface on performance of hybrid solar system Name : V N Palaskar, Research Scholar (User Account no: 1068) ICT Mumbai. Dr. S.P. Deshmukh, Research Supervisor, ICT Paper code: 48. Mumbai.
  2. 2. Quick glance of presentation: 1) Introduction 2) Experimental 3) Equations used to calculate various parameters 4) Results and Discussion 5) Conclusion 6) Future scope
  3. 3. 1) Introduction A. Voltage generated by commercial PV module was found decreasing by 0.065 to 0.085 V/ 0C rise in its temperature above 25 0C at ATC conditions. B. Due to its heating, electrical efficiency of module drops by 10 % to 35% . C. At 25 0C module can produce 10% to 35% more power than un cooled module. D. PV modules convert only 15% of solar energy to electrical energy and 85% energy dissipates to surrounding in the form of heat, increasing temperature of module and surrounding air. E. Hybrid PV/T solar systems combine PV module and solar thermal collector, forming equipment that produces electricity and thermal energy from one integrated system . F. A specially designed heat exchanger called an oscillatory flow PV absorber and its effect on performance of hybrid PV/T system is studied in this work.
  4. 4. 2) Experimental 2.1) Special flow Aluminum PV absorber heat exchanger surface design with fabrication. 2.2) Fiber Glass wool insulation. 2.3) Complete assembly of hybrid PV/T solar water system with all measuring instruments. 2.4) Experimental observations.
  5. 5. 2.1 ) Heat exchanger surface design with fabrication mounted at back side of PV module. Fig. 1 Installation of an oscillatory flow PV absorber surface at rear side of PV module.
  6. 6. 2.2) Fiber Glass wool insulation fitted at back side of heat exchanger. Fig. 2 Setting up glass wool at rear side of an oscillatory flow PV absorber surface.
  7. 7. 2.3) Complete assembly of hybrid PV/T solar water system with all measuring instruments. Fig. 3 Hybrid (PV/T) solar water system which shows all Measuring instruments connected each other to form assembly.
  8. 8. 2.4) Experimental observations A) All experiments were conducted during month of May-13 and slope of PV module was kept at 50 (North- South). B) Daily experiments performed between morning 9:30 to 4:30 pm. C) Different readings such as global radiation; wind velocity of surrounding air; voltage and current at corresponding loading conditions were recorded in 30 minutes of time interval over a day. D) K-type thermocouples were attached to data logger to scan and record temperatures of PV module at various points of its top & bottom and ambient temperature in 30 second time interval were recorded.
  9. 9. E) Inlet and exit water temperatures from hybrid system were recorded to calculate thermal power for every 30 minutes of time interval. F) Experiments on hybrid system were conducted by considering different flow rates of water through heat exchanger such as 0.028, 0.035 and 0.042 kg/sec to predict the flow rate of system generating highest PV, thermal, combined PV/T efficiency and performance ratio.
  10. 10. 3) Equations used to calculate various technical parameters. PPV = V * I (1) PT = m * Cp * (Twe –Twi ) (2) IG = IGn * APV (3) PR= PPV/PSTC (4) ɳPV = (V * I)/ IG (5) ɳT = PT / IG (6) ɳPV/T = ɳPV + ɳT (7)
  11. 11. 4) Nomenclature and Greek symbols. V : Voltage produced by PV module at ATC conditions (V) I : Current produced by PV module at ATC conditions (A) PPV : Electrical power produced by PV module at ATC conditions (W) PT : Useful thermal power produced by hybrid (PV/T) solar water system (W) m : Mass flow rate of water (kg/sec) Cp : Specific heat of water (J/kg 0K) Twi : Water inlet temperature (0K) Twe : Water exit temperature (0K) IG : Total solar input power incident on PV module (W) IGn : Total Solar radiation measured by Pyranometer parallel to module surface (W/m2) APV : Area of PV module (m2) PR : Performance ratio (%) PSTC : Electrical power produced by PV module at STC conditions (W) ηPV : Electrical Efficiency of PV module (%) ɳT : Thermal efficiency of hybrid (PV/T) solar water system (%) ɳPV/T : Combined PV/T efficiency (%)
  12. 12. 5) Result and Discussion 5.1) Performance of un-cooled commercial PV module: A. The highest voltage and current produced by un-cooled module were 27.5 volts and 4.2 A at 12.30 pm as shown in fig. 4 & 5. B. At the same time, module was able to produce highest PV electrical power of 115.2 W with performance ratio of 64 % and PV module efficiency of 10.2% as shown in fig. 6 & 7. C. During experiments, un-cooled PV module was found heated at top side with 64 0C temperature as shown in fig.8.
  13. 13. 5.2) Performance of hybrid PV/T solar water system: A. After cooling, open circuit voltage and working voltage were found to be 39.80 V and 30.3 V at 1 pm. B. As a result of cooling , PV power was found increased to 134.2 W with performance ratio of 75 % and PV efficiency of 11.7 % respectively at the same time as shown in fig. 6 & 7. C. Due to cooling of module, additional thermal power of 482 W was obtained from hybrid system at flow rate of 0.035 Kg/sec producing highest PV power. D. By fixing heat exchanger at back side of PV module and utilizing waste heat energy, module working temperature was dropped to 46.7 0C over a day as shown in fig. 8. E. The combined PV/T efficiency 53.7 % was obtained from hybrid system as shown in fig. 9.
  14. 14. Voltage (V) 36 32 28 24 20 16 12 8 4 0 Vuncooled Vcooled 09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 Time (Hrs) Current (A) Fig. 4 Voltage produced by un cooled and cooled PV module. 5.50 5.00 4.50 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0.00 Iuncooled Icooled 09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 Time (Hrs) Fig. 5 Current produced by un cooled and cooled PV module.
  15. 15. Photovoltaic output Power (W) 180.0 160.0 140.0 120.0 100.0 80.0 60.0 40.0 20.0 Ppv-uncooled Ppv-cooled 0.0 09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 Time (Hrs) Fig. 6 PV power produced by un cooled and cooled PV module. 16.0 PV module efficiency (%) 14.0 12.0 10.0 8.0 6.0 ηPV-un cooled 4.0 ηPV-cooled 2.0 0.0 09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 Time (Hrs) Fig. 7 PV efficiency of un cooled and cooled PV module.
  16. 16. Top side PV Module temperature (0C) 70.0 60.0 50.0 40.0 30.0 TTPV-uncooled 20.0 TTPV-cooled 10.0 0.0 09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 Time (Hrs) Fig. 8 Top side temperature (TTPV) attended by un cooled and cooled PV module. 70.0 ηPV-un cooled Efficiency (%) 60.0 ηPVT 50.0 40.0 30.0 20.0 10.0 0.0 09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 Time (Hrs) Fig. 9 PV efficiency of un cooled and combined PV/T efficiency of cooled PV module.
  17. 17. 5.3) Performance comparison of simple PV module and hybrid PV/T system at ATC condition: Sr. Technical parameters No Simple Hybrid PV/T PV module system 1 Voltage (V) 27.5 30.30 2 Current (A) 4.2 4.43 3 PV power (W) 115.2 134.2 4 PV efficiency (%) 10.2 11.7 5 Thermal power (W) ---- 482 6 Thermal efficiency (%) ---- 42 7 Combined PV/T efficiency (%) ---- 53.7 8 Top side module temp. (0C) 64 46.7 9 Performance ratio 64 75
  18. 18. 6) Conclusions A) After converting simple PV module to hybrid PV/T system, PV electrical power and efficiency of water cooled module had been improved by 16.5 % and 14.7 % respectively at 1 pm. B) Hybrid PV/T system produced thermal power and efficiency of 482 W and 42% respectively achieving combined efficiency of 53.7 %. C) After cooling, module temperature had been decreased by 37 % at water flow rate of 0.035 kg/sec.
  19. 19. D) The performance ratio of PV module of hybrid PV/T system was increased by 11% because of cooling effect. E) On yearly basis this hybrid system can produce combined PV/T energy of 1110 KWh with PV electrical energy of 345 KWh for PV module area of 1.25 m2.
  20. 20. Thank you !

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