Reference materials to understand methods of solar-powered cooling

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Discussion Overview

The discussion revolves around methods of solar-powered cooling, specifically focusing on the use of concentrated solar heaters and the potential application of an Einstein refrigerator. Participants are seeking technical resources and insights into the physics and modeling of solar cooling systems.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant is exploring the use of a linear fresnel reflector to harness heat for a cooling system with minimal electricity usage.
  • Another participant mentions a PDF resource that discusses efficiency and cost but lacks detailed physics content.
  • A suggestion is made that thermal energy from the solar unit could directly run a compressor without needing to convert it to electricity.
  • One participant proposes using an Einstein refrigerator due to its reliability and lack of moving parts, despite potential efficiency concerns.
  • Another participant expresses interest in the Einstein refrigerator and shares a link to a related project that achieved below-freezing temperatures.
  • A participant indicates difficulty in understanding the equations related to the Einstein refrigerator, particularly for calculating pressures and quantities of refrigerants.

Areas of Agreement / Disagreement

Participants generally agree on the potential of solar-powered cooling systems and the Einstein refrigerator concept, but there is no consensus on the best approach or the specifics of the underlying physics and calculations.

Contextual Notes

Some participants express uncertainty regarding the technical details and equations necessary for modeling the cooling systems, indicating a need for further clarification and resources.

Loboguy
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I am working on a concentrated solar heater using a linear fresnel reflector.
I want to learn how I can harness this heat to power a cooling system, preferably with minimal use of electricity. I am in India, so this has a huge ground for application.

I was looking at ideas here, and while neat concepts are presented, the details of how to model them are not.
http://www.machine-history.com/Solar%20Powered%20Air%20Conditioning

I'd be very much obliged if someone can list some good technical resources on solar cooling. If someone knows about an open-source solar cooler, or wants to start designing one, that'd be frickin' awesome too.
 
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I found a pretty nice PDF, but it mostly covers efficiency and cost (yes, I know those are important). I can't find many resources detailing the physics behind these systems. Perhaps I'm not looking correctly.
 
Loboguy said:
I am working on a concentrated solar heater using a linear fresnel reflector.
I want to learn how I can harness this heat to power a cooling system, preferably with minimal use of electricity. I am in India, so this has a huge ground for application.

I was looking at ideas here, and while neat concepts are presented, the details of how to model them are not.
http://www.machine-history.com/Solar%20Powered%20Air%20Conditioning

I'd be very much obliged if someone can list some good technical resources on solar cooling. If someone knows about an open-source solar cooler, or wants to start designing one, that'd be frickin' awesome too.

Loboguy said:
I found a pretty nice PDF, but it mostly covers efficiency and cost (yes, I know those are important). I can't find many resources detailing the physics behind these systems. Perhaps I'm not looking correctly.

Welcome to the PF.

The thermal energy you get from the solar power unit will need to run a compressor for the air conditioning portion. I don't think you need to convert it to electricity first, just mechanically turn the compressor shaft...
 
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berkeman said:
The thermal energy you get from the solar power unit will need to run a compressor for the air conditioning portion. I don't think you need to convert it to electricity first, just mechanically turn the compressor shaft...

That makes sense.

After some research I think I'm going to go with an Einstein refrigerator to do the cooling - it has no moving parts and is a closed system. Whatever it may lack in efficiency it makes up for in reliability, and I'll be using free solar energy to power it anyway ^_^
 
berkeman said:
Interesting. I'd never heard of the Einstein Refrigerator before.

Neither had I, lol. I found it purely by accident. But it is extremely promising.
This fellow, Andrew Delano, built one for his Master's / Ph.D. He got below freezing on his first try, apparently.
http://www-old.me.gatech.edu/energy/students/andy.htm
 
The guy's research on the Einstein refrigerator is quite nice.
The problem is, I understand the concept just fine but I'm having trouble following all the equations, haha. And I need to understand the equations to calculate the pressures required and the amounts of water, butane, and ammonia to be used.

I don't suppose someone would be willing to break it down for me? lol
 

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