The world is facing an imminent energy supply crisis. In order to sustain and increase our energy supply in an environmentally conscious manner, it is necessary to advance renewable technologies. An area of recent interest is in concentrating solar energy systems that use very high efficiency solar cells. Much of the recent research in this field is oriented toward three dimensional high concentration systems, but this research focused on a two dimensional linear concentrating photovoltaic (LCPV) system combined with an active cooling and waste heat recovery system. The LCPV system serves two major purposes: it produces electricity and the waste heat that is collected can be used for heating purposes. There are three parts to the LCPV simulation. The first part simulates the cell cooling and waste heat recovery system using a model consisting of heat transfer and fluid flow equations. The second part simulates the GaInP/GaAs/Ge multijunction solar cell output so as to calculate the temperature-dependent electricity generation. The third part of the simulation includes a waste heat recovery model which links the LCPV system to a hot water storage system. Coupling the multijunction cell model, waste heat recovery model and hot water storage system model gives an overall integrated system that is useful for system design, optimization, and acts as a stepping stone for future multijunction cell photovoltaic/thermal (PV/T) systems simulation. All of the LCPV system components were coded in Engineering Equation Solver V8.425 (EES) and were used to evaluate a 6.2 kWp LCPV system under actual weather and solar conditions for the Phoenix, AZ, region. This evaluation was focused on obtaining an optimum flowrate, so as to produce the most electrical and heat energy while reducing the amount of parasitic load from the fluid cooling system pump. Under the given conditions, it was found that an optimal cooling fluid flowrate of 4 gal/min ($2.52×10-4m3/s$) would produce and average of 45.9 kWh of electricity and 15.9 kWh of heat energy under Phoenix conditions from July 10–19, 2005. It was also found that the LCPV system produced an average of $4.59 worth of electrical energy and displaced$0.79 worth of heat energy, while also displacing a global warming potential equivalent of 0.035 tons of $CO2$ per day. This simulation uses system input parameters that are specific to the current design, but the simulation is capable of modeling the LCPV system under numerous other conditions.

References

References
1.
Green
,
M. A.
,
Emery
,
K.
,
Hishikawa
,
Y.
, and
Warta
,
W.
,
2008
, “
Solar Cell Efficiency Tables (Version 32)
,”
Prog. Photovoltaics: Res. Appl.
,
16
(
5
), pp.
435
440
.10.1002/pip.842
2.
Kritchman
,
E. M.
,
Friesem
,
A. A.
, and
Yekutieli
,
G.
,
1979
, “
Highly Concentrating Fresnel Lenses
,”
Appl. Opt.
,
18
, pp.
2688
2695
.10.1364/AO.18.002688
3.
March Pumps
,
2009
, “
Specifications for TE-7R-MD, TE-7K-MD, and TE-7S-MD
,” March Pumps, Glenview, IL.
4.
Garg
,
H. P.
, and
Agarwal
,
R. K.
,
1995
, “
Some Aspects of a PV/T Collector/Forced Circulation Flat Plate Solar Water Heater With Solar Cells
,”
Energy Convers. Manage.
,
36
, pp.
87
99
.10.1016/0196-8904(94)00046-3
5.
Kerzmann
,
T.
, and
Schaefer
,
L. A.
,
2012
, “
System Simulation of a Linear Concentrating Photovoltaic System With an Active Cooling System
,”
Renewable Energy
,
41
, pp.
254
261
.10.1016/j.renene.2011.11.004
6.
Klein
,
S. A.
,
2009
, “
Engineering Equation Solver for Microsoft Windows Operating Systems: Commercial and Professional Versions,” F-Chart Software
7.
National Renewable Energy Laboratory
,
2007
, “National Solar Radiation Database 19912005 Update: Users Manual, National Renewable Energy Laboratory, Golden, CO, Technical Report NREL/TP-581-41364.
8.
Shah
,
R. K.
, and
London
,
A. L.
,
1978
,
Laminar Flow Forced Convection in Ducts: A Source Book for Compact Heat Exchanger Analytical Data
,
New York
.
9.
Incropera
,
F. P.
, and
DeWitt
,
D. P.
,
1996
,
Introduction to Heat Transfer
,
3rd ed.
,
Wiley
,
New York
.
10.
Kandlikar
,
S. G.
,
1990
, “
A General Correlation for Two-Phase Flow Boiling Heat Transfer Coefficient Inside Horizontal and Vertical Tubes
,”
ASME J. Heat Transfer
,
112
, pp.
219
228
.10.1115/1.2910348
11.
Berlemont
,
A.
,
Ceccio
,
S.
,
Cheng
,
Y.
, and
Chung
,
J. E. A.
,
2006
,
Multiphase Flow Handbook
,
Taylor & Francis
,
London
.
12.
Gnielinski
,
V.
,
1976
, “
New Equations for the Heat and Mass Transfer in Turbulent Pipe and Channel Flow
,”
Int. Chem. Eng.
,
16
, pp.
359
368
.
13.
Emcore Corporation
,
2008
, CTJ Photovoltaic Cell Specification Sheet.
14.
Baxter
,
V. D.
,
1991
,
ASHRAE Handbook—HVAC Applications
, American Society Heating, Refrigeration, and Air-Conditioning Engineers Publication, Atlanta, GA.
15.
ASHRAE
,
2003
, “
Service Water Heating
,”
HVAC Applications Handbook
,
American Society of Heating, Refrigeration and Air Conditioning Engineers Publications
,
Atlanta, GA, Chap. 49
.
16.
Fox
,
R. W.
, and
McDonald
,
A. T.
,
1998
,
Introduction to Fluid Mechanics
,
5th ed.
,
Wiley
,
New York
.
17.
Reed
,
M.
,
2009
,
personal communication with Michael Reed
,
Sales Representative for Array Technologies Inc.
18.
Luna-Camara
,
J.
,
2010
, Electric Power Monthly, yearly report, United States Energy Information Administration, Office of Coal, Nuclear, Electric and Alternate Fuels U.S. Department of Energy Washington, DC.
19.
,
2010
, “Natural Gas Summary,” available at: http://www.eia.gov/dnav/ng/ng_sum_lsum_dcu_nus_m.htm
20.
U.S. Department of Energy—Energy
, Efficiency and Renewable Energy, 2009, “Space Heating and Cooling—Furnaces and Boilers.”
21.
U.S. Environmental Protection Agency
,
2010
, Greenhouse Gas Equivalencies Calculator.
22.
U.S. Department of Energy
,
2000
, Carbon Dioxide Emissions From the Generation of Electric Power in the United States.