Question

Evacuated tube (vacuum tubes) are always a good choice over flat plate water heaters Select (a) True or (b) false justify your answers based on the below given graph. Collector Efficiency Category C 9 0F Normal year-round operating range for most of the Past this intersection, the efficiency of ETS Efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Ti-Ta (°F) Flat Plate (Selective Absorber) Evacuated Tube Flat Plate Painted Absorber) - Unglazed Pool

Answer 1

False

Category C 36 F Category D 90 F Norma yearround operating range for water heating in most of the United States Pase this intersection, the efficiency of ETS is gremer than that of FPS. Efficiency (%) Fp) nevac 0 nevaconte 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Ti-Ta (°F) Flat Plate (Selective Absorber) - Evacuated Tube - Flat Plate (Painted Absorber Unglazed Pool

From the graph above, it's clear that for the temperature difference up to 65 ^oF, Flat Plate has higher efficiency than the Evacuated tube collector.

For temperature difference above 65 ^oF, the Evacuated tube collector has higher efficiency than a flat-plate collector.

So, we can't say that Evacuated Tube collectors are always a good choice over flat plate collectors.

So the answer will be false.

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