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Author Topic: Corrosion in plate heat exchanger  (Read 11059 times)
Fionn
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« Reply #30 on: February 21, 2018, 06:08:11 PM »

Bottom temperature would typically be room temperature and top temperature would be maybe 5-10C below panel flow temperature, it's a while since I've checked and I didn't take notes last time I did.
I've actually got no real issue with the thermosiphon element, it's the low delta across the heat exchanger that's disappointing, I could be seeing the return solar circuit at over 50C while the tank bottom is at 20C. It's not due to excessive solar circuit flow rate either, I'm only seeing 3-5l/m on the flow meter due to having the (admittedly short) solar circuit in 10mm copper.
« Last Edit: October 03, 2018, 05:03:54 PM by Fionn » Logged

6.75kW PV - 2.75kW East, 1.5kW South, 2.5kW West. 3 x Flat Plate Solar Thermal with side arm FPHE on 268L cylinder
Fionn
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« Reply #31 on: October 03, 2018, 04:33:44 PM »

Just an update here, I've ordered a new heat exchanger with 30 plates to replace my current 10 plate exchanger.
I'm optimistic that I should see greatly improved performance (higher delta T across the exchanger)
It should be an easy swap as the connections and dimensions (other than height) are the same.
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6.75kW PV - 2.75kW East, 1.5kW South, 2.5kW West. 3 x Flat Plate Solar Thermal with side arm FPHE on 268L cylinder
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