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# Basic thermodynamics and water

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The average home has a 200 liter (50-60 gallon) hot-water tank, which is effectively drained and replenished three times per day. Assume that the entering tap water is 10 degrees C and is heated to 57 degrees C.

Given an average energy from sunlight of 1.53 kJ/cm2 per day, how large would the collection area (in m2) of a solar water heater need to be if its efficiency is 28%?

Assume that the price of a solar collector is \$375/m2. How much would it cost to install this hot water system?

https://brainmass.com/chemistry/energetics-and-thermodynamics/basic-thermodynamics-and-water-35191

#### Solution Preview

What the question is asking is really how much energy does it take to heat 6,000,000 cc's of water by 47 degrees C (200 L x 1000 cc/L x 3 "fills") (remembering in metric that for water a cc IS a ml is a ...

#### Solution Summary

Solution to heat capacity, solar energy and water problem...final solution links to costing of a solar water heating system.

\$2.49