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  1. danberry

    Combustion Thermodynamics

    I think the answer you are looking for may be that water condenses at "normal" temperatures while CO2 does so only at unusually low temperatures. The 32F reference temperature for industrial combustion calculations is way above CO2 condensing temperatures, so the latent heat of CO2 can be...
  2. danberry

    Heating with a small engine

    I wouldn't mess with the truck's engine at all. Simply circulate the pump engine coolant in a separate radiator with a fan in the cab.
  3. danberry

    Burning trees is not always carbon neutral

    Burning woodwaste is better than burning fossil fuels if the waste was going to rot otherwise (such as when landfilled). That is a no-brainer. Cutting down trees to produce power is just as stupid as growing corn to produce methanol. It takes government grants to make it economically feasible...
  4. danberry

    HELP! psychometrics steam ventilation condensing issues

    Can't you set-up an extraction fan & hood near the source so as to evacuate say 10% more than the volume of steam you are generating. It would be better than mixing all that steam with the ambiant air before exhausting it outside.
  5. danberry

    Increasing Evaporation

    What governs the evaporation rate is the heat from the steam. While blowing air might lower the water temperature, it will not increase the evaporation rate significantly. you still need to provide the heat via the steam coil. If the incoming water is very hot, blowing air will get the water...
  6. danberry

    Operating a balanced draft boiler on natural draft

    I wouldn't expect to run a boiler without the FD fan running. You will get away without the FD fan for a low load but at some point you will be smoking up the boilerroom. Balanced units are not designed for pressurised furnace operation. If the smoke doesn't bother you, hot spots on the external...
  7. danberry

    Using geothermal to cool pipes

    How about using an automotive radiator and an electric fan
  8. danberry

    Conversion pulverized coal boiler to burn 100% biomass

    A PC boiler is designed suspension burning while biomass is usually burned on a grate or in a fluidised bed. You are looking at a major conversion and a sizable expenditure but there is no reason it can't be considered. I would investigate two avenues: 1) thoroughly dry (with the flue gases)...
  9. danberry

    Steam loss through failed steam trap calculation

    I knew it. Get the trap vendor in; He will do all the necessary calculations to justify the new traps and even buy lunch
  10. danberry

    Energy recovery in wastewater treatment plant

    One could consider a heat pump on a warm stream to produce a hot stream for space or water heating and/or to run an ammonia chiller. It needs power but lowers the energy cost. I suspect it wouldn't be cost effective.
  11. danberry

    Steam loss through failed steam trap calculation

    The only reason to evaluate the loss through a failed steam trap would be to justify (to your stingy boss) spending the money to replace it. My tip is: spend the money on the new trap, not on the engineering. Cheers
  12. danberry

    air properties over 400F

    "Indeed, if I consider the water saturation pressure at air temperature, this is higher than ambient pressure. Does it make sense to define a relative humidity in this conditions ?" NO. There can be an infinite quantity of water per pound of dry air because the temperature is above the...
  13. danberry

    a silly question

    P.S. its not a silly question.
  14. danberry

    a silly question

    I would venture YES but due consideration must be given to the question "a percentage of what". For example: I would say that comparing the ratio of final temperatures (actual / calculated) is quite missleading. The ratio of actual / calculated heat transfer coefficient (or associated R value)...
  15. danberry

    what would you do?

    I would put my concerns in writing and send them registered mail to your ex employer. This way you cover yourself by passing the responsability on and you can't be accused of trying to harm anyone's reputation.
  16. danberry

    air temp rise at outlet of a blower

    Vesselguy, You can't assume constant volume here. The volume does change in a compessor. Assuming constant volume means the air needs to occupy the same volume at double the pressure. Heating the air to 520F will do just that. The perfect gas law can't be used to solve a compressor...
  17. danberry

    Number of steam turbines to be installed

    RMW is absolutely correct but one big machine generally wins over multiple small ones. 18 MW is already a small system. There is a lot one can do with steam turbine systems to work around part-load issues.
  18. danberry

    DOES GEOTHERMAL MAKE ECONOMIC SENSE?

    I recently evaluated the simple payback period for a residential geothermal heating system. In my opinion, 17 years was way too long, especially since maintenance costs were left out of the equation. You may get different results. The point is: you have to do the math. Get firm quotes and power...
  19. danberry

    How fast can water absorb heat from combustion gas to produce steam

    Injecting water in an internal combustion engine is not new. It is done with some aircraft piston engines to lower flame temperatures and allows a power boost. Water can be injected in gas turbines as well for power boost or to reduce emissions. Its best to inject water at the compression stage...
  20. danberry

    air properties over 400F

    There can be water in the air AND relative humidity IS a nonsense. The fact is there can be an infinite quantity of water per pound of dry air becaust the temperature is above the saturation temperature of water at 5 bar. You need to determine the water content one way or another but you cant...

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