Recent content by mdk42

  1. M

    How does an Energy Recovery Heat Pipe Work?

    Not a bad technology, but I'm not sure about the 99+% efficiency. Heat pipe recovery systems do have one drawback--they only recover sensible heat. Active and Passive Dessicant systems, heat wheels, can recover both sensible and latent heat and can work in both the summer and winter.
  2. M

    Gravity Questions: Measuring and Speed

    I have two questions concerning gravity that I have never found a definite answer to. The first: How is gravity detected from afar? I've read about scientists detecting gravity in the universe where there is not enough mass to be producing that much gravity. If the gravity can be...
  3. M

    Surprising HVAC Lesson: Air Conditioning Costs in Philly vs. Vegas

    Not bad on your explanation. When I design systems and calculate annual energy costs, a good rule of thumb to use is the closer the dry and wet-bulb temperatures are to each other, the more energy you'll use to condition the space. Air conditioning systems cool 'sensibly' first, ie they change...
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