Great idea! I have thought about ways of utilizing heat from cooling PVs, and of using solar to preheat intake air for a heat pump, but this merges both
Everything looks great, only one thing got me thinking:
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During winter nights, air will be drawn through the heat pump from under the house to help recover any heat loss from the floor system.
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If you are losing heat through your floor, then you will lose less and less as the air under the floor gets warmer by accumulating this heat. If you use this heated air for the heat pump (boosting its efficiency), then it will be replaced with cold air, increasing heat loss through the floor.
Of course, if there is a breeze under your house and you are losing the warm air anyway, then passing it through the heat pump makes sense.