Hybrid solar thermal and photovoltaic energy collection
Techniques for hybrid solar thermal and photovoltaic energy collection are provided. In one aspect, a photovoltaic concentrating thermal collector (PVCTC) includes: a thermal absorber collector; and bent solar panels forming a parabolic shaped trough reflector partially surrounding the thermal absorber collector so as to reflect incident light onto the thermal absorber collector. A PVCTC system including an array of PVCTC units and a method for hybrid electrical and thermal energy production are also provided.
1. A method for hybrid electrical and thermal energy production, comprising:
providing a photovoltaic concentrating thermal collector (PVCTC) system having at least one PVCTC unit comprising a thermal absorber collector, a cooling fluid within the thermal absorber collector, and parabolically-bent solar panels forming a parabolic shaped trough reflector partially surrounding the thermal absorber collector, wherein each parabolically-bent solar panel comprises multiple solar cells, wherein each PVCTC unit comprises two of the parabolically-bent solar panels side-by-side one another, wherein an array of the PVCTC units is present extending along the length of the thermal absorber collector, and wherein the PVCTC system is mounted to a solar tracking system;
using the solar tracking system to point the bent solar panels toward the sun;
absorbing a portion of incident light on the bent solar panels to generate electrical energy; and
reflecting a portion of the incident light from the parabolic shaped trough reflector onto the thermal absorber collector to heat the cooling fluid within the thermal absorber collector thereby generating thermal energy.
2. The method of claim 1 , wherein the PVCTC system further comprises a thermal storage media tank containing a thermal storage media, and a primary heat exchanger, within the thermal storage media tank and in contact with the thermal storage media, fluidly connected to the thermal absorber collector, the method further comprising:
pumping the cooling fluid from the thermal absorber collector through the primary heat exchanger; and
transferring heat from the cooling fluid in the primary heat exchanger to the thermal storage media in the thermal storage media tank.
3. The method of claim 1 , wherein the PVCTC system further comprises a secondary heat exchanger within the thermal storage media tank and in contact with the thermal storage media, wherein the secondary heat exchanger contains a working fluid, the method further comprising:
transferring heat from the thermal storage media in the thermal storage media tank to the working fluid in the secondary heat exchanger.
4. The method of claim 1 , wherein the solar tracking system comprises a two-axis solar tracking system that permits the PVCTC system to rotate along two different axes.
5. The method of claim 1 , wherein the parabolically-bent solar panels comprise crystalline silicon photovoltaic panels.
6. The method of claim 1 , wherein the parabolically-bent solar panels are mounted to a trough-shaped frame.
7. The method of claim 6 , wherein the parabolically-bent solar panels are mounted to the trough-shaped frame using an adhesive.
8. The method of claim 1 , wherein the parabolically-bent solar panels are glazed with an optical coating selected from the group consisting of: magnesium fluoride, zinc sulfide, silicon dioxide, titanium oxide, and combinations thereof.
9. The method of claim 1 , wherein the thermal absorber collector comprises an evacuated thermal absorber collector.