Subtask A: Collector Field and Loop


Correction of collector efficiency depending on fluid type, flow rate and collector tilt
IEA-SHC INFO SHEET 45.A.1
February 2015 - PDF 0.35MB
By: Federico Bava, Simon Furbo, Alfred Brunger
The efficiency of a solar collector is influenced by the solar collector fluid, flow rate and collector tilt. However, test institutes usually determine the collector efficiency for only one combination of fluid type, flow rate and tilt angle. This fact sheet describes investigations on the influence and importance of variations of solar collector fluid, flow rate and collector tilt on the efficiency and thermal performance of different solar collectors. Additionally, the effect of a fluorinated ethylene propylene foil used as convection barrier between glass cover and absorber is investigated.
Correction of collector efficiency depending on fluid type, flow rate and collector tilt
Correction of collector efficiency depending on fluid type, flow rate and collector tilt
IEA-SHC TECH SHEET 45.A.1
February 2015 - PDF 0.82MB
By: Federico Bava, Simon Furbo, and Alfred Brunger
In its basic form, a solar thermal collector is designed to intercept solar radiation, absorb that radiation to convert it into heat energy, and then deliver that heat to a heat transfer fluid. Therefore, the performance of a solar thermal collector is influenced by all variables that affect either the optical or the thermal properties of the collector. For example, the incidence angle of solar radiation onto the solar collector can affect the optical performance of the collector. While typically not a strong factor for solar thermal collectors, the changing spectral quality of sunlight with changing atmospheric conditions can influence the fraction of the incoming solar radiation that gets transmitted and absorbed by the collector. Tilt angle, especially for glazed flat plate collectors, affects internal and external convective heat transfer coefficients, and thus influences collector thermal performance. Heat transfer fluid flow rate and fluid thermal properties influence the heat transfer coefficient inside the fluid passages of the collector, and thus influence the collector efficiency.
Correction of collector efficiency depending on fluid type, flow rate and collector tilt
Simulation of Large Collector Fields
IEA-SHC INFO SHEET 45.A.4
February 2015 - PDF 0.31MB
By: Bengt Perers and Simon Furbo
Simulation is a very useful tool for design and sizing of a solar collector field. To get a good accuracy it is important to start with a load analysis and secondly to find accurate enough local weather data. Also a time resolution of at least hourly weather data is needed. The split into beam and diffuse radiation is also very important, to derive a good all-day simulation accuracy. Then of course the component models and accuracy of the input data is very important too. Below some hints are given to make a good collector field simulation.
Simulation of Large Collector Fields
Simulation of large collector fields for system design and optimization
IEA-SHC TECH SHEET 45.A.4
February 2015 - PDF 0.46MB
Simulation is a very useful tool for design and sizing of a solar collector field. To get a good accuracy it is important to start with a load analysis and secondly to find accurate enough local weather data. Also a time resolution of at least hourly weather data is needed. The split into beam and diffuse radiation is also very important, to derive a good all-day simulation accuracy. Then of course the component models and accuracy of the input data is very important too. Below some hints are given to make a good collector field simulation.
Simulation of large collector fields for system design and optimization
SHC Task 45.A.3.2 INFO Sheet: Guarantee of Annual Output
April 2014 - PDF 0.37MB
By: Jan Erik Nielsen, PlanEnergi
This method for giving and checking annual output of collector fields takes into account that the weather and operating temperatures may vary from year to year. The method works with monthly average operation temperatures and hourly average weather data and will work for systems having approx. constant operating temperatures on a monthly basis – like e.g. solar district heating systems. The basic idea of the method is described in brief below.
SHC Task 45.A.3.2 INFO Sheet: Guarantee of Annual Output
SHC Task 45.A.3.2 INFO Sheet: Guaranteed Power Output
April 2014 - PDF 0.32MB
By: Jan Erik Nielsen, PlanEnergi
The performance guarantees described here relate to the power performance of a collector field and a heat exchanger under some restricted (“full load”) operating conditions. The procedures described here do not pretend to give and check a guarantee on the annual output of the system. For annual output guarantee, see IEA-SHC Fact Sheet 45.A.3.2 “Guaranteed annual output”
SHC Task 45.A.3.2 INFO Sheet: Guaranteed Power Output
SHC Task 45.A.3.2 TECH Sheet: Guarantee of Annual Output
April 2014 - PDF 0.59MB
By: Jan Erik Nielsen, PlanEnergi
A methodology for giving and checking the annual output of collector fields is described. The method takes into account that the weather and operating temperatures may vary from year to year. The method works with monthly average operation temperatures and hourly average weather data and will work for systems having approx. constant operating temperatures on a monthly basis – like e.g. solar district heating systems.
SHC Task 45.A.3.2 TECH Sheet: Guarantee of Annual Output
SHC Task 45.A.3.2 TECH Sheet: Guaranteed Power Output
April 2014 - PDF 0.62MB
By: Jan Erik Nielsen, PlanEnergi & Daniel Trier, PlanEnergi
The performance guarantees described here relate to the power performance of a collector field and a heat exchanger under some restricted (“full load”) operating conditions. The procedures described here do not pretend to give and check a guarantee on the annual output of the system.
SHC Task 45.A.3.2 TECH Sheet: Guaranteed Power Output