Solar Hot Water Temperatures Parkview

  • Channel ID: 123925
  • Author: jcgtrace
  • Access: Public
SRHPE 150 litre Solar Ray Geyser Analysis. 19 direct coupled vacuum tubes 1.8m long x 58mm dia. Panel is facing North East set up at 35º to horizontal on top of flat roof. LDR estimates light intensity by Lux = 500/(Rldr)^1.3
  solar, thermistor, ldr, arduino nano, iot, temperatures, hot water, analysis, energy balance
MATLAB Analysis MATLAB Visualization

Field 1 Chart
Field 2 Chart
Plot all Temperature Data Solar
Field 8 Chart
Field 6 Chart
Field 7 Chart
Field 3 Chart
Field 5 Chart
Field 4 Chart
Energy Balance per 24hr (kWh)
Channel Location
Geyser Avg Temperatures last 3 days Solar
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jcgtrace over 9 years ago
The Temperatures are measured by 10k Thermistors in voltage divider circuits with individually measured resistors, accuracy +- 0.1ºC. The mixer valve temperatures are measured 200mm up or down stream from the valve which is behind the geyser on top of the roof. All 22mm copper pipes 100% covered with ThermaFlex insulation.
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jcgtrace over 9 years ago
The LDR Lux calculation has been changed to Lux = 500 * ldrR^-1.3 this was done for a better approximation of Lux and to stop the excessive readings at near zero resistance.
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hickse over 9 years ago
This is a cool project that I learned about via Michael James. Is it possible to get a copy of the code?
hickse70@gmail.com.
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jcgtrace over 9 years ago
Sure I will send it to you on email.
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jcgtrace over 9 years ago
The Lux data is available on channel 123452. Field 6 now reflects the available light Power derived from Power = Lux*2 / 70 in (W). Its an approximation based on calibration from max available Lux of 100 000 to max power of 1400 W/m² and 2m² panel. Will use this to compare to energy harvested in heating water later.
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jcgtrace over 9 years ago
Made some changes :
We added 3 additional thermistors to measure Hot Water Temp out and Cold Water Temp in to the geyser, as well as the temp at the bottom of the Vac tube outside the glass but inside the plastic retaining cap. Solar Power IN has been moved to channel 123452 to allow for the 8 temp fields.
This has been done with the aid of two multiplexer chips. One for suppling power to the sensors and one to read the thermistors individually.
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jcgtrace about 9 years ago
Fields 6, 7 and 8 were incorrectly labled. This has now been fixed. Data has remained the same. Sorry for any inconvenience caused.
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jcgtrace about 9 years ago
Programme update has resulted in Field 4 now recording Light Radiance in Lux in the middle of the solar array at the same angle using a LDR.
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jcgtrace almost 9 years ago
Insulated Geyser Tank 100%. Had to let the water and empty the tank to get insulation under a support bracket.
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clam285 about 7 years ago
Could you post the line of code for the Today trace in Geyser Avg Temperatures last 3 days.
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