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Viewing 15 posts - 1 through 15 (of 25 total)
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  • in reply to: does hydro still send a bill #64254
    j_pigden
    Participant

    Depends on where you live. Call your supplier and ask!

    in reply to: Radiant floor heat from fireplace #64243
    j_pigden
    Participant

    Water temp will be your biggest concern.

    Check the limits of the PEX you want to use then check the temp at the back of your stove. Will the glycol overheat the PEX?

    Do you have excess heat to transfer into the glycol?

    Think about how you will deal with all the various situations; most notably, stove working but no need for heating water. What would happen to the heat transfered into the glycol?

    Would you be better off with a fan?

    in reply to: combating condensation in van dwelling #64244
    j_pigden
    Participant

    The problem with all those type of vents is heat-loss. Either the outside air brought in is cold or the outside is cold and the moist air inside condenses. You almost need a dedicated place where condensation CAN occur and you have a drain or a tank to deal with the water there, sort of a natural dehumidifier. I’m thinking a heat transfer plate to use the cold outside air to draw the moisture out of the inside air. Unfortunately, I can’t work out a simple way to keep the heat inside but lower the humidity. The obvious solution is an humidistat controlling an insulated cover on the plate dehumidifier. The inside air only gets to the cold plate when the indoor humidity gets too high. This solution starts to get complicated and expensive!

    in reply to: Pump water from stream to tank? #64185
    j_pigden
    Participant

    You didn’t say where you are. 2 problems with tanked water; cold weather and stagnation!

    in reply to: Portable solar power system for farmers market #64186
    j_pigden
    Participant

    If you live in Arizona and hook up a battery and leave it out in the sun all week and only use it on weekends.

    Look at your juicer and see how much energy it uses.

    Look at the USGS web site for the solar gain figures for your location.

    Look at the specs for the system and see what the % conversion efficiency to expect.

    Divide the total current flow hours needed by the solar gain then multiply by the % efficiency to get the time you need to run the solar system to get the needed power. Don’t forget to multiply by the efficiency percentages of each device in your system. This tells you how much battery you need and how long you need to run the charger.

    Don’t forget to allow for low energy days!

    j_pigden
    Participant

    Do you have running water nearby?

    in reply to: Any Energy Gained From Solar Panels Toward Water #64137
    j_pigden
    Participant

    PVA’s work best under direct sunlight but only at about 14%. Additionally, not all types of light produce electricity from a PVA at the same level. Since backscatter from water is lower in intensity, lacks some of the full spectrum, and is less focused, it adds little to the total from the cells. Better to add silvered reflectors or a rotation system to keep the cells under full intensity for longer each day.

    NREL has already shown a cell with 40.8% efficiency but requires special manufacturing and handling steps so, RSN (real soon now). As an aside, it splits the incoming EMS into 3 parts and produces an electron from each of the partial photon making 3 electrons from 1 photon instead of 1 electron from 1 photon.

    in reply to: Need Help – Solar Powered Fan #64136
    j_pigden
    Participant

    Excellent answers 12v & spontaneous; unfortunately neither answer has anything to do with the original question.

    in reply to: #64127
    j_pigden
    Participant

    The difference is the width of your concern.

    If you are interested in the ‘global’ impact, then, yes battery production is an energy pit.

    Myself, I’m more concerned with my own survival. Since battery devices hit my pocket less than wired devices, I go battery. BUT, watch out for corded recharge stations, the ‘vampire’ electrical costs can be HUGE!!!

    in reply to: Are heat lamps the most efficient heat source? #64128
    j_pigden
    Participant

    For a more exact explanation, you need to look at thermodynamics, heat and energy transfer texts.

    Heat transfer uses 3 ways, convection, conduction and radiation. Convection warms air which moves because warm air is lighter and floats upward. Conduction warms by touch (the basis of convection). Heat lamps are radiation. Use only heat lamps and your pipes will burst (they only heat where they are pointed)!

    When the lamp gets hot, that is wasted energy. For a more efficient process use QH bulbs.

    in reply to: Woodburning stoves #64130
    j_pigden
    Participant

    ‘burning waste wood is carbon neutral’, on what planet! Burning produces CO & CO2, doesn’t matter what the source! Wood is basically rreeaallllly young coal! Both have the same source material; coal has preprocessing by heat, pressure & time!

    in reply to: power for camper #64131
    j_pigden
    Participant

    Can you say ‘perpetual motion’? I knew you could.

    in reply to: Energy saving light bulbs #64132
    j_pigden
    Participant

    If you have access to computer power supplies, they will drive your LEDs. String 3 in series to each 12 volt circuit.

    in reply to: bild it your self (D.I.Y enegy) #64133
    j_pigden
    Participant

    Cold frames use glass not plastic as part of the greenhouse effect. The EMS frequency of IR is only partly reflected by plastic. Glass has a higher reflectivity index.

    in reply to: bild it your self (D.I.Y enegy) #64134
    j_pigden
    Participant

    Energy can be neither created nor destroyed, only transformed.

    Having quoted that, let me ask where the energy to turn the fans comes from? A windmill uses solar energy third-hand. The sun heats the earth; earth heats the air; air moves windmill. Fan attached to front of car decreases fuel economy; entropy says energy gained is lower than the energy value of the fuel because of inefficiency of internal combustion engine, and energy losses in the re-conversion and storage processes.

Viewing 15 posts - 1 through 15 (of 25 total)