The present work intended to investigate thermal and thermohydraulic efficiencies of two different models of recyclic double pass packed bed solar air heaters experimentally. Model-I consists of single air pass through two glass covers as well as double air pass caused due to recycle of the air exiting from the packed bed duct formed between the absorber plate and the glass cover through another duct integrated between the absorber and back plates to inlet of the packed bed duct. On the other hand, model-II consists of only double air pass originated due to recycle operation constituted between the similar solar air heater elements as that of model-I. Twelve numbers of wire mesh screens to form 95% bed porosity were used. Both solar air heater models were tested under the range of packed bed Reynolds number from 300 to 1500 for air mass flow rate and recycle ratio of 0.01 kg/s to 0.025 kg/s and 0.3 to 1.8, respectively. Results revealed that thermal performance of model-I is found to be 15% higher than that of model-II. The optimum value of the recycle ratio for model-I and model-II are obtained as 0.9 and 1.2, respectively, at a mass flow rate of 0.025 kg/s that yields the best thermohydraulic efficiency of 77% and 67%, respectively. Moreover, optimum solution for recycle ratio and air mass flow rate during off sun shine hours are also obtained and presented in the current work.

References

References
1.
Sodha
,
M. S.
,
Bansal
,
N. K.
, and
Singh
,
D.
,
1982
, “
Analysis of a Non-Porous Double-Flow Solar Air Heater
,”
Appl. Energy
,
12
(
4
), pp.
251
258
.
2.
Biondi
,
P.
,
Clcala
,
L.
, and
Fai-Ina
,
G.
,
1988
, “
Performance Analysis of Solar Air Heaters of Conventional Design
,”
Sol. Energy
,
41
(
1
), pp.
101
107
.
3.
Jha
,
R. K.
,
Choudhury
,
C.
,
Garg
,
H. P.
, and
Zaidi
,
Z. H.
,
1992
, “
Performance Prediction of a Solar Heater House
,”
Energy Convers. Manage.
,
33
(
4
), pp.
263
273
.
4.
Pawar
,
R. S.
,
Takwale
,
T. M. G.
, and
Bhide
,
V. G.
,
1994
, “
Evaluation of the Performance of the Solar Air Heater
,”
Energy Convers. Manage.
,
35
(
8
), pp.
699
708
.
5.
Ong
,
K. S.
,
1995
, “
Thermal Performance of Solar Air Heaters: Mathematical Model and Solution Procedure
,”
Sol. Energy
,
55
(
2
), pp.
93
109
.
6.
Hegazy
,
A. A.
,
2000
, “
Performance of the Flat Solar Air Heaters With Optimum Channel Geometry for Constant/Variable Flow Operation
,”
Energy Convers. Manage.
,
41
(
4
), pp.
401
417
.
7.
Hegazy
,
A. A.
,
2000
, “
Thermohydraulic Performance of Heating Solar Collectors With Variable Width, Flat Absorber Plates
,”
Energy Convers. Manage.
,
41
(
13
), pp.
1361
1378
.
8.
Paisarn
,
N.
, and
Kongtragool
,
B.
,
2003
, “
Theoretical Study on Heat Transfer Characteristics and Performance of the Flat-Plate Solar Air Heaters
,”
Int. Commun. Heat Mass Transfer
,
30
(
8
), pp.
1125
1136
.
9.
Forson
,
F. K.
,
Nazha
,
M. A. A.
, and
Rajakaruna
,
H.
,
2003
, “
Experimental and Simulation Studies on a Single Pass, Double Duct Solar Air Heater
,”
Energy Convers. Manage.
,
44
(
8
), pp.
1209
1227
.
10.
Mittal
,
M. K.
, and
Varshney
,
L.
,
2006
, “
Optimal Thermal–Hydraulic Performance of a Wire Mesh Packed Bed Solar Air Heater
,”
Sol. Energy
,
80
(
9
), pp.
1112
1120
.
11.
Karwa
,
R.
,
Karwa
,
N.
,
Misra
,
R.
, and
Agarwal
,
P. C.
,
2007
, “
Effect of Flow Maldistribution on Thermal Performance of a Solar Air Heater Array With Subcollectors in Parallel
,”
Energy
,
32
(
7
), pp.
1260
1270
.
12.
Hernandez
,
A. L.
, and
Quinonez
,
J. E.
,
2013
, “
Analytical Models of Thermal Performance of Solar Air Heaters of Double-Parallel Flow and Double-Pass Counter Flow
,”
Renewable Energy
,
55
, pp.
380
391
.
13.
Yeh
,
H. M.
,
Ho
,
C. D.
, and
Hou.
,
J. Z.
,
1999
The Improvement of Collector Effciency in Solar Air Heaters by Simultaneously Air Flow Over and Under the Absorbing Plate
,”
Energy
,
24
(
10
), pp.
857
871
.
14.
Dhiman
,
P.
,
Thakur
,
N. S.
,
Kumar
,
A.
, and
Singh
,
S.
,
2011
, “
An Analytical Model to Predict the Thermal Performance of a Novel Parallel Flow Packed Bed Solar Air Heater
,”
Appl. Energy
,
88
(
6
), pp.
2157
2167
.
15.
Dhiman
,
P.
,
Thakur
,
N. S.
, and
Chauhan
,
S. R.
,
2012
, “
Thermal and Thermohydraulic Performance of Counter and Parallel Flow Packed Bed Solar Air Heaters
,”
Renewable Energy
,
46
, pp.
259
268
.
16.
Singh
,
S.
, and
Dhiman
,
P.
,
2013
, “
A Numerical Evaluation of Thermal Performance of Double Flow Packed Bed Solar Air Heaters
,”
Int. J. Renewable Energy Technol.
,
4
(
3
), pp.
242
264
.
17.
Thakur
,
N. S.
,
Saini
,
J. S.
, and
Solanki
,
S. C.
,
2003
, “
Heat Transfer and Friction Factor Correlations for Packed Bed Solar Air Heater for a Lower Porosity System
,”
Sol. Energy
,
74
(
4
), pp.
319
329
.
18.
Nowzari
,
R.
,
Aldabbagh
,
L. B. Y.
, and
Egelioglu
,
F.
,
2014
, “
Single and Double Pass Solar Air Heaters With Partially Perforated Cover and Packed Mesh
,”
Energy
,
73
, pp.
694
702
.
19.
El-Sebaii
,
A. A.
,
Aboul-Enein
,
S.
,
Ramadan
,
M. R. I.
,
Shalaby
,
S. M.
, and
Moharram
,
B. M.
,
2011
, “
Thermal Performance Investigation of Double Pass-Finned Plate Solar Air Heater
,”
Appl. Energy
,
88
(
5
), pp.
1727
1739
.
20.
El-Sebaii
,
A. A.
,
Aboul-Enein
,
S.
,
Ramadan
,
M. R. I.
, and
El-Bialy
,
E.
,
2007
, “
Year Round Performance of Double Pass Solar Air Heater With Packed Bed
,”
Energy Convers. Manage.
,
48
(
2
), pp.
990
1003
.
21.
Ramadan
,
M. R. I.
,
El-Sebaii
,
A. A.
,
Aboul-Enein
,
S.
, and
El-Bialy
,
E.
,
2007
, “
Thermal Performance of a Packed Bed Double-Pass Solar Air Heater
,”
Energy
,
32
(
4
), pp.
1524
1535
.
22.
Ramani
,
B. M.
,
Gupta
,
A.
, and
Kumar
,
R.
,
2010
, “
Performance of a Double Pass Solar Air Collector
,”
Sol. Energy
,
10
(
1
), pp.
1010
1016
.
23.
Paisarn
,
N.
,
2005
, “
Effect of Porous Media on the Performance of Double-Pass Flat Plate Solar Air Heater
,”
Int. Commun. Heat Mass Transfer
,
32
(
1
), pp.
140
150
.
24.
Paisarn
,
N.
,
2005
, “
On the Performance and Entropy Generation of the Double-Pass Solar Air Heater With Longitudinal Fins
,”
Renewable Energy
,
30
(
9
), pp.
1345
1357
.
25.
Sopian
,
K.
,
Supranto Daud
,
W. R. W.
,
Othman
,
M. Y.
, and
Yatim
,
B.
,
1999
, “
Thermal Performance of the Double Pass Solar Collector With and Without Porous Media
,”
Renewable Energy
,
18
(
4
), pp.
557
564
.
26.
Sopian
,
K.
,
Alghoul
,
M. A.
,
Alfegi
,
E. M.
,
Sulaiman
,
M. Y.
, and
Musa
,
E. A.
,
2009
, “
Evaluation of Thermal Efficiency of Double-Pass Solar Collector With Porous-Non Porous Media
,”
Renewable Energy
,
34
(
3
), pp.
640
645
.
27.
Languri
,
E. M.
,
Taherian
,
H.
,
Hooman
,
K.
, and
Reisel
,
J.
,
2011
Enhanced Double-Pass Solar Air Heater With and Without Porous Medium
,”
Int. J. Green Energy
,
8
(
6
), pp.
643
654
.
28.
Karim
,
M. A.
,
Perez
,
E.
, and
Amin
,
Z. M.
,
2014
, “
Mathematical Modelling of Counter Flow V-Grove Solar Air Collector
,”
Renewable Energy
,
67
, pp.
192
201
.
29.
Ho
,
C. D.
,
Yeh
,
H. M.
, and
Sheu
,
W. S.
,
1998
An Analytical Study of Heat And Mass Transfer Through a Parallel-Plate Channel With Recycle
,”
Int. J. Heat and Mass Transfer
,
41
(
17
), pp.
2589
2599
.
30.
Yeh
,
H. M.
,
Ho
,
C. D.
, and
Sheu
,
W. S.
,
2000
Double-Pass Heat or Mass Transfer Through a Parallel-Plate Channel With Recycle
,”
Int J. Heat Mass Transfer
,
43
(
3
), pp.
487
491
.
31.
Ho
,
C. D.
,
Yeh
,
C. W.
, and
Hsieh
,
S. M.
,
2005
, “
Improvement in Device Performance of Multi-Pass Flat-Plate Solar Air Heaters With External Recycle
,”
Renewable Energy
,
30
(
10
), pp.
1601
1621
.
32.
Ho
,
C. D.
,
Yeh
,
H. M.
, and
Wang
,
R. C.
,
2005
Heat-Transfer Enhancement in Double-Pass Flat-Plate Solar Air Heaters With Recycle
,”
Energy
,
30
(
15
), pp.
2796
2817
.
33.
Yeh
,
H. M.
, and
Ho
,
C. D.
,
2009
, “
Solar Air Heaters With External Recycle
,”
Appl. Therm. Eng.
,
29
(
8–9
), pp.
1694
1701
.
34.
Yeh
,
H. M.
, and
Ho
,
C. D.
,
2009
, “
Effect of External Recycle on the Performances of Flat-Plate Heaters With Internal Fins Attached
,”
Renewable Energy
,
34
(
5
), pp.
1340
1347
.
35.
Yeh
,
H. M.
, and
Ho
,
C. D.
,
2011
, “
Heat-Transfer Enhancement of Double-Pass Solar Air Heaters With External Recycle
,”
J. Taiwan Inst. Chem. Eng.
,
42
(
5
), pp.
793
800
.
36.
Yeh
,
H. M.
, and
Ho
,
C. D.
,
2011
, “
Downward-Type Solar Air Heaters With Internal Recycle
,”
J. Taiwan Inst. Chem. Eng.
,
42
(
2
), pp.
286
291
.
37.
Ho
,
C. D.
,
Yeh
,
H. M.
, and
Chen
,
T. C.
,
2011
, “
Collector Efficiency of Upward-Type Double Pass Solar Air Heaters With Fins Attached
,”
Int. Commun. Heat Mass Transfer
,
38
(
1
), pp.
49
56
.
38.
Ho
,
C. D.
,
Yeh
,
H. M.
,
Cheng
,
T. W.
,
Chen
,
T. C.
, and
Wang
,
R. C.
,
2009
, “
The Influences of Recycle On Performance of Baffled Double-Pass Flat-Plate Solar Air Heaters With Internal Fins Attached
,”
Appl. Energy
,
86
(
9
), pp.
1470
1478
.
39.
Ho
,
C. D.
,
Chang
,
H.
,
Wang
,
R. C.
, and
Lin
,
C. S.
,
2012
, “
Performance Improvement of a Double-Pass Solar Air Heater With Fins And Baffles Under Recycling Operation
,”
Appl. Energy
,
100
, pp.
155
163
.
40.
Mohammadi
,
K.
, and
Sabzpooshani
,
M.
,
2014
Appraising the Performance of a Baffled Solar Air Heater With External Recycle
,”
Energy Convers. Manage.
,
88
, pp.
239
250
.
41.
Ho
,
C. D.
,
Lin
,
C. S.
,
Chuang
,
Y. C.
, and
Chao
,
C. C.
,
2013
, “
Performance of Wire Mesh Packed Double-Pass Solar Air Heaters With External Recycle
,”
Renewable Energy
,
57
, pp.
479
489
.
42.
Singh
,
S.
, and
Dhiman
,
P.
,
2014
, “
Thermal and Thermohydraulic Performance Evaluation of a Novel Type Double Pass Packed Bed Solar Air Heater Under External Recycle Using an Analytical and RSM (Response Surface Methodology) Combined Approach
,”
Energy
,
72
, pp.
344
359
.
43.
Dhiman
,
P.
, and
Singh
,
S.
,
2015
, “
Recyclic Double Pass Packed Bed Solar Air Heaters
,”
Int. J. Therm. Sci.
,
87
, pp.
215
227
.
44.
Singh
,
S.
, and
Dhiman
,
P.
,
2015
, “
Using an Analytical Approach to Investigate Thermal Performance of Double-Flow Packed-Bed Solar Air Heaters With External Recycle
,”
J. Energy Eng.
,
141
(
3
), p.
04014031
.
45.
ASHRAE Standard 93–97
,
1977
,
Methods of Testing to Determine the Thermal Performance of Solar Collectors
,
ASHRAE
,
New York
.
46.
Moffat
,
R. J.
,
1988
, “
Describing the Uncertainties in Experimental Results
,”
Exp. Therm. Fluid Sci.
,
1
(
1
), pp.
3
17
.
You do not currently have access to this content.