to the Solar CollectorBrainstorming and Development
Water Project 1
Water & Space Heating
Actually a "cycle" to me was one on-off cycle. The "pulse rate" and "pulse width" will vary on demand. It might be once a day or once in 5 minutes, just like my AC, or my water pump.
Controlling the fan/pump speed is the easy part; how do you "control" the controller? Are you using some sort of differential comparator? I'm still trying to figure out how this works... From what I gather you have one pump supplying several sectors each with its own valve, which may be opened or closed by a thermostat. Are the valves proportional or are they on-off? In either case I think you would need a pressure-sensitive pump which is probably what was described earlier. I've discovered that (at least some) centrifugal pumps ARE pressure-sensitive. Cut off the flow and the power draw goes DOWN. Not completely as there is still friction and fluid swirling around in the pump, but it DOES go down. I checked a few minutes ago with a small AC fountain pump. At free-flow it draws 23 watts (per Kill-A-Watt). With the discharge capped, power draw was 15 watts. I'm sure any engineer can explain it.I can't speak for YOUR pump, but it might be worth checking._________________________________________________________________-Another approach might be to give each sector its own pump (apparently some systems do). Probably the valve controls already installed could control a pump instead (my differential thermostat controls a valve AND a pump with the same wire). When a sector needs heat the thermostat turns on its pump instead of opening the valve. When the sector doesn't need heat the pump is off. When they are all off there is no power draw, instead of a single pump working against closed valves.I guess it all depends on how much money you want to spend to save a few bucks in electricity. An 80w pump running 24/365 will draw about 1.9 kwh per day or about 700 kwh per year. At my electricity rate that's $70 per year. If I can cut that to 25w 50% of the time, I've reduced my cost to $46/year. I've saved $24. If, say, I only run the system 6 months, I've saved a whopping $12. In a year. Really significant. How much was that VS pump again?
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