Transport stored heat/cold in containers  

(@tobias)
Active Member

Would it be possible to charge saltx with an external heatsource like industries producing alot of heat (eg. cement), heat springs, old drilholes, volcanos, csp plants? The idea is to charge the saltx and put it in large containers and then sell "seasonal heat and/or cold" either for a district, off grid households, housing society, greenhouses, hotels or other companies, marine, groceries stores?

Also is it possible to get a higher heatoutput when charged? Charge saltx with 90 degress but get 300 degress output? What about the reverse? If charged with 90 degrees is it possible to get a heatoutput of 40 degrees during a longer duration?

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Posted : 04/10/2018 7:36 am
(@liudasmikal)
Admin

Hi @tobias! Great questions! The concept you describe is absolutely feasible! The economy of such endeavor is up to you to decide. When buying the salt in quantities over 100 tonnes you can get the price of 1.5-5EUR per kg.

The scenario of raising the output temperature is not possible unless you use some sort of heat pump to ramp up the temperature. You can reduce the temperature by designing special heat exchangers for that reason!

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Posted : 04/10/2018 1:01 pm
(@tobias)
Active Member

Assumptions:

Saltx 160 kwh/m3

Standard container around 33 m3

Standard house or villa around 15 000 kwh heating + 5000 kwh for hot water. That makes the heatdemand / year 20 000kwh.

A container capacity of kwh: 33m3*160kwh/m3 = 5300kwh

The desity of NaCl is around 2,16 g/cm³. I Guess saltx has a lower density?

Kg in a container: 2​160​kg/m3*33= 71300 kg salt

Cost of saltx: 1.5-5 euro/kg

71300*3euro = 107 000-356 500 euro/container

For germany average Price of kwh is 0.35$/kwh.

Cost for a villa per/year would then be 20 000 kwh * 0.35 = 7000 $

That would mean a salt container break-even would be around 15-20 years.. bah! If i Got My calculation correctly...

Another idea is to use saltx as a complement to ship engines. Excess heat from engines could also charge the saltx. Wonder how much gas you could save / year om a ship if you use saltx for heating/cooling needs and propulsion (fuel)?

 

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Posted : 09/10/2018 7:22 am
(@liudasmikal)
Admin

Hey @Tobias! Good approach calculating the payback time! SaltX salts can be up to 400kWh/m3. However, it's not just salt that needs to go into the container. To retrieve the heat from the salt, you will need equipment, also to move the salt. We are opening our EnerStore demo for visitors on October 23 in Hagersten. Feel free to visit!

Coming back to your calculations, if you make many containers, you can get a really good price, closer to EUR1.5 per kg. You can get paid to absorb excess electricity from the network, so 0.35 cents per kWh is not entirely correct.

Check out the case of the week section about ships - we had a case of the week based on our hackathon winner solution a few weeks ago. It's very similar to what you describe.

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Posted : 15/10/2018 2:05 pm
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