solar collector

Mike C._4

I understand that the air vents located by the manifolds are to be used at startups and periodically and then basically manually closed to remove the air inially in the system. I am not sure how excess pressure would be relieved. Your relief valve will take care of the excess pressure after the diaphram tank does its job. I don't see how you are going to lose glycol that easily. The sun won't be shining during a hurricane anyway. If the panels do reach stagnation for very long make sure you have the antifreeze checked out. Don't worry about it.

Mike

rene_3

I recently installed a solar hot water closed loop system. I have two 25 evacuated tube collectors. I know that in case of a power outage, the tubes will continue to heat and cause the glycol to boil. I have a vent next to one of the collectors where the steam would escape. My question is, would the condensor on the end of the heat pipes do any permanent damage to the manifold if there isn't any fluid in the manifold? There talking about a hurricane possibly coming to New England this weekend and I'll be out of town for a few days. I'm not worried about the the way I've mounted the collectors to my roof, it's just the steam/heat issue. Thanks.

rene_3

I recently installed a solar hot water closed loop system. I have two 25 evacuated tube collectors. I know that in case of a power outage, the tubes will continue to heat and cause the glycol to boil. I have a vent next to one of the collectors where the steam would escape. My question is, would the condensor on the end of the heat pipes do any permanent damage to the manifold if there isn't any fluid in the manifold? There talking about a hurricane possibly coming to New England this weekend and I'll be out of town for a few days. I'm not worried about the the way I've mounted the collectors to my roof, it's just the steam/heat issue. Thanks.

singh

My understanding

is the reason the vent is close after intial purging is to prevent "crackle" This is when the water boils out of the glycol blend and escapes thru the vent, leaving behind just glycol , which wil harden, coat and plug up the collectors.

I also think most manufacturers have a fusible type plug in the collectors that prevents any ill effects from long periods of stagnation.

I have to agree with Mike , put a container under the relief to catch any glycol if it blows.

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