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AZ ROC C-77 Plumbing Including Solar (Commercial) Practice Questions - Arizona ROC C-77 CR-77 Plumbing Including Solar (Commercial) Examination Exam

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A closed-loop commercial solar thermal system contains a total fluid volume of 40 gallons of a 40% propylene glycol mix. The fluid expands by 5% when heated from 60°F to its maximum operating temperature. What minimum acceptance volume must the diaphragm expansion tank provide to absorb fluid thermal expansion?
Correct Answer:
2.0 gallons

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