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'''1. Flat plate collector model''' [https://github.com/rrh/ascend_renewable_energy/blob/master/flat_plate_collector.a4l Link to code]
[https://docs.google.com/document/d/1Ox9a4bmNKBpdCD48jsa06AYF-UVp59GIIUYb6PZ3hwY/edit?hl=en_US&authkey=CMmK8JkH# Vikram Kadam] is a final year Mechanical Engineering student at Indian Institute of Technology, Kharagpur, who participated in [[GSOC2011]] with ASCEND. Vikram withdrew before completing the programme.
 
Development branch: {{srcbranchdir|vikram|}} (especially {{srcbranchdir|vikram|models/solar}})
 
= GSoC 2011 Participation =
GSoC 2011 Proposal: [http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/vikiseth/1 Improvement on ASCEND's support for renewable energy system modelling]
 
Mentor: [[John Pye]]
 
== Goals ==
Improvement on ASCEND's support for renewable energy system modelling:
*Expanding the model library of Renewable Energy System modelling
*Enhancing the models' usability and functionality and making it more robust
 
== Tasks ==
Immediate Task:
*Modifying SunPos Model
*Creating robust models from Chapter 2, Patnode Thesis: Steady State Models of Solar Radiation Processor, Receiver, Concentrator types at the SEGS
 
By Mid Term Review:
*May 23  - May 30 : Modifying SunPos Model and creating robust models from Chapter 2, Patnode Thesis
*May 30  - June 6 : Solar Receivers
*June 6  - June 13: Solar Concentrators
*June 13 - June 20: Solar radiation processor and Storage Tank
*June 20 - June27 : Heat Exchanger
*June 27 - Jul 4  : Pump,Flow Mixer
*Jul 4  - Jul 11 : Auxiliary Heater
 
By Final Term Review:
*Jul 15 - Jul 22: Ducting and Piping Losses
*Jul 22 - Jul 29: Card reader
*Jul 29 - Aug 5: Space heating load
*Aug 5 - Aug 12: Relief valve
*Aug 12 - Aug 19: Solar process Economics load model:
*Aug 19 - Aug 22: Final Documentation
 
== Progress Report ==
 
'''July 14, 2011'''
 
New Models
* Water Heater {{srcbranch|vikram|models/solar/water_heater.a4l}}
* Adiabatic Flow Mixer {{srcbranch|vikram|models/solar/adiabatic_flow_mixer.a4l}}
 
 
'''July 11, 2011'''
 
Fixed
* Packed Bed Thermal Storage Tank  {{srcbranch|vikram|models/solar/packed_bed_thermal_storage_tank.a4l}}
* Cylindrical Absorber {{srcbranch|vikram|models/solar/cylindrical_absorber.a4l}}
 
New Models
* Pump {{srcbranch|vikram|models/solar/pump.a4l}}
* Sky Temperature {{srcbranch|vikram|models/solar/sky_temp.a4l}}
 
 
'''Jun 30, 2011'''
 
Sun Tracker {{srcbranch|vikram|models/solar/tracker.a4l}}
 
The different kinds of the tracking mechanism are considered to get the governing equation, which in turn, along with sunpos, gives the relation between time, position, orientation of the collector and incidence angle.
 
Status :  tracker 2 works, tracker 1 has issues
 
 
Packed Bed Thermal Storage Tank at {{srcbranch|vikram|models/solar/packed_bed_thermal_storage_tank.a4l}}
 
Assumptions:
* One dimensional plug flow
* No axial conduction or dispersion
* No mass transfer
* No heat loss to the environment
* No temperature gradients within the energy storing solid particles (valid for Biot number less than 0.1)
In this model, a packed bed thermal storage tank, in which pebbles are used to store heat, is modelled.
 
Status : Completed mathematically but diverges
 
 
Cylindrical Absorber {{srcbranch|vikram|models/solar/cylindrical_absorber.a4l}}
 
Assumptions:
* Cylindrical absorbing tube
* Single glass cover over the absorbing tube.
* No temperature gradient around the receiver tube
* No loss due to conduction through the structure supports horizontal receiver tubes
A cylindrical collector is modelled for both concentrator and flat plate systems. This model gives the total heat absorbed by water after all the convective, radiative and pipe losses.
 
Status: completed mathematically but diverges
 
 
Currently working on :
 
* Pump: Fixed flow rate pump with heat losses
* Flow mixer: Multiple flow inputs to the mixer and mixture fluid temperature and flow rate to be given as outputs.
 
 
'''Jun 20, 2011'''
 
Already done
* Flat plate collector (has issues : diverges on solving)
* Direct Normal Insolation on an incline (correct)
* Tracking mechanisms for solar concentrators at {{srcbranch|vikram|models/solar/tracker.a4l}} and {{srcbranch|vikram|models/solar/absorbed_radiation_with_tracking.a4l}} (has issues - gives ''zbrent : root must be bracketed'' error)   
 
Currently working on
* Cylindrical receivers and parabolic collector at {{srcbranch|vikram|models/solar/cylindrical_absorber.a4l}}  (Incomplete)
* Packed bed thermal storage tank. (Mathematically modelled / Not commited yet)
* Liquid thermal storage tank. (Mathematically modelled / Not commited yet)
 
'''May 23, 2011'''
* Read [https://www.nrel.gov/analysis/sam/pdfs/thesis_patnode06.pdf Patnode Thesis]
* Working of the Immediate task
 
== Pre-acceptance Notes ==
 
'''1. Solar field model''' {{srcbranch|vikram|models/solar/solar_field_model.a4l}} 
 
[[File:Solar_field_Model_of_Patnode.jpg|thumb|upright=2.0|alt=A cartoon centipede reads books and types on a laptop.|Solar field
 
model.]]
 
 
This model uses the approach by Patnode to the field efficiency of solar field at SEGS.
 
Detailed analysis of the model can be found in the [https://www.nrel.gov/analysis/sam/pdfs/thesis_patnode06.pdf original thesis].
 
 
'''2. Solar field model using sunpos.a4l''' {{srcbranch|vikram|models/solar/solar_field_model_using_sunpos.a4l}}
 
This model is same as 1st one except it uses johnpye/sunpos.a4c instead of direct equations for sun-position related variables.
 
 
'''3. Solar field model (using fprops for specific enthalpy)'''
 
{{srcbranch|vikram|models/solar/solar_field_model_fprops_used.a4l}}
 
This model is same as 1st one except it used fprops library in ascend instead of direct equations for specific enthalpy.
 
Issue : call fprops property function gives 'out of bounds' error for input rho and T.
 
'''4. Flat plate collector model''' {{srcbranch|vikram|models/solar/flat_plate_collector.a4l}}
 
Here, He is  trying to model commonly used 'fin and tube' type of absorber,a flat plate collector, for liquid heating.
He has considered 1 glass cover. Model aims at calculating overall heat loss coefficient (Ul) and useful energy gain (Qu).


Here, I am trying to model commonly used 'fin and tube' type of absorber,a flat plate collector, for liquid heating. I have considered 1 glass cover. Model aims at calculating overall heat loss coefficient (Ul) and useful energy gain (Qu).
Mean plate temperature and ambient temperature are given.
Mean plate temperature and ambient temperature are given.


Thus model is valid for the range of 'effective transmittance-absorptance product' which satisfy below mentioned assumptions. Also model does not calculate the solar gain S {= (effective transmittance-absorptance product) * ( solar radiation falling on tilted collector surface)} but take it as direct entry.
Thus model is valid for the range of 'effective transmittance-absorptance product' which satisfy below mentioned assumptions. Also  
 
model does not calculate the solar gain S {= (effective transmittance-absorptance product) * ( solar radiation falling on tilted  
 
collector surface)} but take it as direct entry.


Assumptions:
Assumptions:
1. Performance is steady state.
# Performance is steady state.
2. Construction is of parallel sheet and tube type.
# Construction is of parallel sheet and tube type.
3. The headers cover small area and can be neglected.
# The headers cover small area and can be neglected.
4. There is no absorption of solar energy by covers insofar as it affects losses.
# There is no absorption of solar energy by covers insofar as it affects losses.
5. The headers provide uniform flow to the collector tubes.
# The headers provide uniform flow to the collector tubes.
6. There is one dimensional heat flow from the covers.
# There is one dimensional heat flow from the covers.
7. There is one dimensional heat flow from the black insulation.
# There is one dimensional heat flow from the black insulation.
8. The covers are opaque to infrared radiation.
# The covers are opaque to infrared radiation.
9. There is negligible temperature drop through covers
# There is negligible temperature drop through covers
10. The sky can be considered a black body for long wavelength radiation at equivalent sky temperature.
# The sky can be considered a black body for long wavelength radiation at equivalent sky temperature.
 
Issue : Iteration exceeded error. This probably Needs better guesses and will be resolved soon.
 
'''5. Some types definition required by above models''' can be found {{srcbranch|vikram|models/solar/mytypes.a4l}}.
 
[[Category:GSOC2011]]
[[Category:ASCEND Contributors]]

Latest revision as of 23:02, 20 February 2012

Vikram Kadam is a final year Mechanical Engineering student at Indian Institute of Technology, Kharagpur, who participated in GSOC2011 with ASCEND. Vikram withdrew before completing the programme.

Development branch: vikram: (especially vikram:models/solar)

GSoC 2011 Participation

GSoC 2011 Proposal: Improvement on ASCEND's support for renewable energy system modelling

Mentor: John Pye

Goals

Improvement on ASCEND's support for renewable energy system modelling:

  • Expanding the model library of Renewable Energy System modelling
  • Enhancing the models' usability and functionality and making it more robust

Tasks

Immediate Task:

  • Modifying SunPos Model
  • Creating robust models from Chapter 2, Patnode Thesis: Steady State Models of Solar Radiation Processor, Receiver, Concentrator types at the SEGS

By Mid Term Review:

  • May 23 - May 30 : Modifying SunPos Model and creating robust models from Chapter 2, Patnode Thesis
  • May 30 - June 6 : Solar Receivers
  • June 6 - June 13: Solar Concentrators
  • June 13 - June 20: Solar radiation processor and Storage Tank
  • June 20 - June27 : Heat Exchanger
  • June 27 - Jul 4  : Pump,Flow Mixer
  • Jul 4 - Jul 11 : Auxiliary Heater

By Final Term Review:

  • Jul 15 - Jul 22: Ducting and Piping Losses
  • Jul 22 - Jul 29: Card reader
  • Jul 29 - Aug 5: Space heating load
  • Aug 5 - Aug 12: Relief valve
  • Aug 12 - Aug 19: Solar process Economics load model:
  • Aug 19 - Aug 22: Final Documentation

Progress Report

July 14, 2011

New Models


July 11, 2011

Fixed

New Models


Jun 30, 2011

Sun Tracker vikram:models/solar/tracker.a4l

The different kinds of the tracking mechanism are considered to get the governing equation, which in turn, along with sunpos, gives the relation between time, position, orientation of the collector and incidence angle.

Status : tracker 2 works, tracker 1 has issues


Packed Bed Thermal Storage Tank at vikram:models/solar/packed_bed_thermal_storage_tank.a4l

Assumptions:

  • One dimensional plug flow
  • No axial conduction or dispersion
  • No mass transfer
  • No heat loss to the environment
  • No temperature gradients within the energy storing solid particles (valid for Biot number less than 0.1)

In this model, a packed bed thermal storage tank, in which pebbles are used to store heat, is modelled.

Status : Completed mathematically but diverges


Cylindrical Absorber vikram:models/solar/cylindrical_absorber.a4l

Assumptions:

  • Cylindrical absorbing tube
  • Single glass cover over the absorbing tube.
  • No temperature gradient around the receiver tube
  • No loss due to conduction through the structure supports horizontal receiver tubes

A cylindrical collector is modelled for both concentrator and flat plate systems. This model gives the total heat absorbed by water after all the convective, radiative and pipe losses.

Status: completed mathematically but diverges


Currently working on :

  • Pump: Fixed flow rate pump with heat losses
  • Flow mixer: Multiple flow inputs to the mixer and mixture fluid temperature and flow rate to be given as outputs.


Jun 20, 2011

Already done

Currently working on

  • Cylindrical receivers and parabolic collector at vikram:models/solar/cylindrical_absorber.a4l (Incomplete)
  • Packed bed thermal storage tank. (Mathematically modelled / Not commited yet)
  • Liquid thermal storage tank. (Mathematically modelled / Not commited yet)

May 23, 2011

Pre-acceptance Notes

1. Solar field model vikram:models/solar/solar_field_model.a4l

Error creating thumbnail: File missing
Solar field model.


This model uses the approach by Patnode to the field efficiency of solar field at SEGS.

Detailed analysis of the model can be found in the original thesis.


2. Solar field model using sunpos.a4l vikram:models/solar/solar_field_model_using_sunpos.a4l

This model is same as 1st one except it uses johnpye/sunpos.a4c instead of direct equations for sun-position related variables.


3. Solar field model (using fprops for specific enthalpy)

vikram:models/solar/solar_field_model_fprops_used.a4l

This model is same as 1st one except it used fprops library in ascend instead of direct equations for specific enthalpy.

Issue : call fprops property function gives 'out of bounds' error for input rho and T.

4. Flat plate collector model vikram:models/solar/flat_plate_collector.a4l

Here, He is trying to model commonly used 'fin and tube' type of absorber,a flat plate collector, for liquid heating. He has considered 1 glass cover. Model aims at calculating overall heat loss coefficient (Ul) and useful energy gain (Qu).

Mean plate temperature and ambient temperature are given.

Thus model is valid for the range of 'effective transmittance-absorptance product' which satisfy below mentioned assumptions. Also

model does not calculate the solar gain S {= (effective transmittance-absorptance product) * ( solar radiation falling on tilted

collector surface)} but take it as direct entry.

Assumptions:

  1. Performance is steady state.
  2. Construction is of parallel sheet and tube type.
  3. The headers cover small area and can be neglected.
  4. There is no absorption of solar energy by covers insofar as it affects losses.
  5. The headers provide uniform flow to the collector tubes.
  6. There is one dimensional heat flow from the covers.
  7. There is one dimensional heat flow from the black insulation.
  8. The covers are opaque to infrared radiation.
  9. There is negligible temperature drop through covers
  10. The sky can be considered a black body for long wavelength radiation at equivalent sky temperature.

Issue : Iteration exceeded error. This probably Needs better guesses and will be resolved soon.

5. Some types definition required by above models can be found vikram:models/solar/mytypes.a4l.

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