Whether it hits the collector and goes into the tanks OR if it just hits the tanks directly (or the floor or plants), the same amount of energy was transferred into the thermal mass of the greenhouse. The greenhouse will only accept a given amount of sunlight (energy). So are you proposing a solar water heater collector inside the greenhouse to heat water tanks that are also inside the greenhouse? That's interesting and I'm not sure how much it will do. Mike Jay wrote:Hi Jared, welcome to Permies! If your high tunnel runs E/W, you may want to consider making part of the North side of the tunnel out of an insulated material. Or if you want your thermal mass to be hidden on the North side of some banana trees where the sun can't hit it, this would be a way to transfer energy there without putting the tanks in the sun. If the collector is outside the greenhouse and absorbing energy that wasn't going to hit the greenhouse, then I think you get a better boost. But day in and day out, the average temp of the greenhouse would remain the same (I think). So if you goal is just increasing thermal mass energy accumulation, it should help. But, you may prefer it to be transferred to you tanks instead of the ground, since water is a better thermal mass. The greenhouse will only accept a given amount of sunlight ( energy).
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