Nanorefrigerants

[Veerendra Jana]

Iam currently doing my project on nanorefrigeration systems. For that I have to add the nanoparticle/nanofluid to the refrigerant, this solution can be called as nanorefrigerant. I have a doubt that is there any process for mixing nanofluid to the refrigerants or we can mix directly (i.e by simply pouring nanofluid into refrigerant).

[J.C.MacSwell]

Iam currently doing my project on nanorefrigeration systems. For that I have to add the nanoparticle/nanofluid to the refrigerant, this solution can be called as nanorefrigerant. I have a doubt that is there any process for mixing nanofluid to the refrigerants or we can mix directly (i.e by simply pouring nanofluid into refrigerant).

Not speaking from experience or expertise, but I do know safe handling and proper disposal is very important to avoid inhalation, absorption or ingestion.

[John Cuthber]

For that I have to add the nanoparticle/nanofluid to the refrigerant...

Why?

What good will it do?

[Veerendra Jana]

By adding nano fluids to the refrigerant heat enhancement is increases which leads to the increase of COP

[John Cuthber]

By adding nano fluids to the refrigerant heat enhancement is increases

Why do you think this?

Are you relying on actual physics here?

If so, please explain it.

Also, in most refrigeration systems the working fluid is circulated and vapourised.

How do you propose to vapourise the nanoparticles?

[Veerendra Jana]

Actually in household refrigeration systems heat is transfer from the condenser to atmosphere and evaporator to inside of the refrigerator. By using normal base fluids (i.e. refrigerants) some limitations is there, those are heat transfer is low which leads to the larger power consumption and decrease in COP.

 

By overcome this limitations I want to add nanoparticles to the refrigerant.

 

By mixing nanoparticles to the refrigerants heat enhancement is increases because of nanoparticles have excellent heat transfer characteristics.

[John Cuthber]

Actually in household refrigeration systems heat is transfer from the condenser to atmosphere and evaporator to inside of the refrigerator. By using normal base fluids (i.e. refrigerants) some limitations is there, those are heat transfer is low which leads to the larger power consumption and decrease in COP.

 

By overcome this limitations I want to add nanoparticles to the refrigerant.

 

By mixing nanoparticles to the refrigerants heat enhancement is increases because of nanoparticles have excellent heat transfer characteristics.

 

I know how at least three different sorts of household refrigerator work.

This is probably the commonest type where I live

https://en.wikipedia.org/wiki/Refrigeration#Vapor-compression_cycle

and the diagram shows an expansion valve.

That won't work when it gets clogged up with nanoparticles.

So, how do you propose to solve that problem?

 

And while you say

" By mixing nanoparticles to the refrigerants heat enhancement is increases because of nanoparticles have excellent heat transfer characteristics."

that's simply not always true.

http://www.tandfonline.com/doi/abs/10.1080/01998595.2013.10769728

 

So, why do you think this will work?

[Veerendra Jana]

Thank you sir for providing valuable information

 

By adding nanoparticles means not simple pouring the particles into the refrigerant. I want to get complete solution after adding nanoparticles that means nanoparticles are soluble in refrigerant. So, I can avoid the clogging of nanoparticles at expansion valve.

 

Actually, some of nanoparticles have heat transfer characteristics not all.

 

Regards

Veeru

Edited November 6, 2015 by Veerendra Jana

[John Cuthber]

If they dissolve, they won't be nanoparticles any more.

And, when the liquid evaporates at the valve and leaves the material behind, the valve will still clog up.

Edited November 6, 2015 by John Cuthber

[RuthlessOptimism]

I have worked with nanoparticle solutions before as an undergraduate student researcher and the first thing I think you should know is that working with nano particles is sometimes fairly difficult.

 

A lot of nano particles are extremely toxic, for example in the case of Chromium (IV) Oxide an acute dose in the regime of micrograms can cause immediate death. Read a lot of literature about nano particle safety first. The reason I say "a lot" is there is a lot of conflicting information out there regarding safety standards and their chronic effects. Aside from ones that pose an immediate and serious danger to your health the chronic effects of nanoparticle exposure for many materials is unknown, in the sense that literally no one knows what it does to you. Most MSDS data for threshold limit values of exposure are actually wrong. The values quoted are often extrapolations from data for microparticles, and the key interest in nano particles and nano systems is that the chemical and physical properties of them are often vastly different from other size regimes. Work with nanoparticles is usually limited to only occur inside of an airtight glovebox.

 

There are a few other practical aspects of working with nanoparticles you will want to consider / look into. The first is that they are extremely messy, a lot of them stick to absolutely everything, so that when you work with them it is difficult to not contaminate basically everything around the workspace. You will need to invest time in developing rigorous clean up protocols. The second is that developing a stable colloidal solution of nanoparticles, or nanoparticles homogeneously dispersed in a fluid is also usually very difficult. This source you might find "a little bit" helpful

 

Horiba Scientific: (White Paper) Dispersing Powders in Liquid for Particle Size Analysis

 

but the creation of a stable colloidal solution is sometimes only possible through a lot of trial and error. In general fluids that are highly polar are the best candidates as a lot of different nano particles acquire a large electrostatic charge and polar fluids are able to most effectively screen charge interactions between the particles. Water is particularly useful because its charge screening abilities can be enhanced by changing its PH.

 

You potentially have a lot of work ahead of you, good luck.

[Veerendra Jana]

Thank you for your useful information sir.

 

Actually, I want to dissolve the nanoparticles in refrigerants in atomic level. So there is no possibility of material formation at throttle valve.

 

Nanoparticles are also get evaporated this leads to increase the heat transfer characteristics.

 

By Tuesday onwards we are going to do the project.

[Veerendra Jana]

Can u please give any nanoparticle names which have better heat transfer characteristics.

Edited November 9, 2015 by Veerendra Jana

[hypervalent_iodine]

Thank you for your useful information sir.

 

Actually, I want to dissolve the nanoparticles in refrigerants in atomic level. So there is no possibility of material formation at throttle valve.

 

Nanoparticles are also get evaporated this leads to increase the heat transfer characteristics.

 

By Tuesday onwards we are going to do the project.

 

 

Can u please give any nanoparticle names which have better heat transfer characteristics.

 

 

Hold up. You're going to start a project Tuesday, invest a bunch of time and money into it when a.) you can't explain how it is going to work and b.) you don't even have a good idea of what you'll be doing or what the current state of the field is? Why are you doing this again?

 

Also, what on earth does dissolving something on the atomic level mean?