Finding out what is needed to power my home

[Stephen Wright]

Hello everyone.

I am trying to put together some ideas that can, go together, that will power different sections of the house and property. We use 75Kwh per day and, I know I can break this down to subsection power blocks, using solar power for some and wind. But 75Kwh per day is a lot to section out.

Any input would be welcomed and, if I need to scrap this approach, that is ok. I would like to go of grid but, there are many thinks that would need to change to lower the Kwh usage per day.

[Rob Beckers]

Hi Stephen,

To put this in some perspective: The average off-grid system/household (if there is such a thing as an average) uses around 200 - 300 kWh per month. That's 6 - 10 kWh per day. Contrast that to your daily energy use and you see where the problem lies.

A 75kWh/day off-grid can certainly be done. If you are independently wealthy... Keep in mind too that making your own energy will be several times more expensive vs. buying it from the grid (I am assuming that rates in TX are not all that high).

As a very, very rough cost number for off-grid systems, count on around $150 per kWh/month. Or to put it another way, a 75 kWh/day system would be somewhere around $300,000, maybe a bit more.

Cheers,

-RoB-

[Peter Mckinlay]

Hello everyone.

I am trying to put together some ideas that can, go together, that will power different sections of the house and property. We use 75Kwh per day and, I know I can break this down to subsection power blocks, using solar power for some and wind. But 75Kwh per day is a lot to section out.

Any input would be welcomed and, if I need to scrap this approach, that is ok. I would like to go of grid but, there are many thinks that would need to change to lower the Kwh usage per day.

Hello Stephen,

That you ask for can be supplied by a Solar generator. For constant supply ground heating is most effective as it is stable.

The device in fact is a modified fridge workings. Refrigerant CO2 is used for its low heat need and high cooling factor.

The expanded hot CO2 provides the turbine drive force.

The drive force is supplied by the working temperature.

Wattage output is governed by the Refrigerant pressure and volume.

The lower the temperature or volume the greater dimension the device must be to supply a specific wattage output.

CO2 provides turbine drive forces commence at -30* Celsius.

CO2 pressure to heat charts can be found on the web.

Wattage output of a one litre turbine rotating at 60 RPM is 720 watts for each litre of flow per second at 9 bar pressure. This increases by RPM, Temperature or Volume.

Peter

[Rob Beckers]

Peter, can you give me a link to an actual existing product that works as you describe. In other words, 3kW continuous output all day long, with no other energy inputs besides geothermal.

-RoB-

[Peter Mckinlay]

Peter, can you give me a link to an actual existing product that works as you describe. In other words, 3kW continuous output all day long, with no other energy inputs besides geothermal.

-RoB-

Hello Bob,

Sorry to say I know of nothing that produces 3kw 24/7 with no other inputs than geothermal!

[Rob Beckers]

Peter, then I don't understand your reply that stated "That you ask for can be supplied by a Solar generator". Stephen was asking for 75 kWh per day in local generation.

If there is a way to generate substantial amounts of electricity with a heat pump I am very much interested (despite the term "solar generator" my understanding from the rest of your text is that this works on ground/geothermal heat?). Maybe you could explain things a bit for me.

Thanks!

-RoB-

[Peter Mckinlay]

Peter, then I don't understand your reply that stated "That you ask for can be supplied by a Solar generator". Stephen was asking for 75 kWh per day in local generation.

If there is a way to generate substantial amounts of electricity with a heat pump I am very much interested (despite the term "solar generator" my understanding from the rest of your text is that this works on ground/geothermal heat?). Maybe you could explain things a bit for me.

Thanks!

-RoB-

Hello Bob,

Sorry to say I cannot be much help. One would first need to come to grips its not a heat pump, it not work at geothermal heat (100*C +), it operates on solar heat anywhere (including cupboards), and it be a solar generator so termed for its reliance on solar heat above -30*C and below +100*C.

[Rob Beckers]

Hi Peter,

OK. So rather than saying what it is not, how about telling us what it is. I still have no clue what you are talking about, but am certainly interested in anything that can produce 75 kWh a day (from the sun or otherwise).

Any links to this device that tells us a bit more about it? Pictures?

-RoB-

[Peter Mckinlay]

Hi Peter,

OK. So rather than saying what it is not, how about telling us what it is. I still have no clue what you are talking about, but am certainly interested in anything that can produce 75 kWh a day (from the sun or otherwise).

Any links to this device that tells us a bit more about it? Pictures?

-RoB-

Hello Rob,

Pictures from computer not download to this site.

Peter

[Peter Mckinlay]

Hello Rob,

Without pictures to accompany it is hard to give a full description, however this may help?

CO2 gas and Steam posses the common property of being covertable to both liquid and ice.

The driver force to any turbine is measured in Bar pressure (one bar being one attmoshere or 14.2 psi). The lowest bar pressure needed to acivate a turbine generater is 9 bar. The lowest volume need passing through the turbine being one litre per second.

Water heated to +100* Celsius produces Steam gas force of one bar. CO2 at +100* Celsius has a gas force in excess of 6,000 bar.

A 175 bar force at Steam Turbine Power Station Tarong Queensland produces 350 megawatts.

Steam needs be heated to +550* Celsius to produce 175 bar pressure. This needs huge amounts of lost cooling water to reduce the Steam back to liquid.

CO2 has peculiar habit of flash cooling needing no outside assistance. This being acheived by aping the expansion chamber of the common fridge.

Both water and CO2 require mechanism to insert either cool gas or liquid back into the boiler.

In the case of CO2 this may be acheived by compresser etched onto a extented turbine shaft.

Reducing the mechanics of operation to one moving part.

The same mechanical layout applies to commercial and domestic electric generation. However much less bar pressure is required. Much less bar pressure needs much less heat.

The minumum heat need of -10* Celsius provides a working pressure of 9 bar. Working pressure being gas at its hottest as opposed to its cooler temprature going into to the boiler.

An 82% efficient turbine receiving one litre of 9,000 bar force per second produces 720KW. CO2 at +100*C has a pressure of 10,000 bar.

CO2 the ideal Refrigerant self converts from +100*C hot to -10*C cold.

The cooling effect of CO2 is now at all Coles Supermarkets. However they obtain the CO2 force by compressor not heat.

There are two types of Refrigeration, Einstein absorption fridge is heat activated, whilst Kelvinator turned to an electric compressor.

Both have a restrictor valve which for the generator has been replaced by a turbine.

Peter

[Rob Beckers]

Pictures should upload just fine to the forum, it'll automagically resize them in the process. The little "paperclip" icon at the top of the edit box is for attachments such as pictures. You can also link to pictures on other sites, that's what the square icon with the mountains on it is for.

There's a tutorial about attaching files (images or otherwise) at http://www.greenpowertalk.org/showthread.php?t=5028

-RoB-

[Peter Mckinlay]

Hello Rob,

Thank you for your help,

Attached is one example of engineering's.

The other a CO2 heat to pressure chart.

Peter