On this page, it states "The key disadvantage of using a very large body of water to achieve heat exchange with a relatively constant temperature is that you are not able to store summer heat in that body of water – to have the benefit of retrieving those higher temperatures in winter."
Why is it so? Is it because a very large body of water would have more heat exchange with the air and hence would lose the heat gathered in summer?
But "heat exchange with a relatively constant temperature" also points in the direction of having a large body of water, so I am a bit confused.
Best Answer
I find the statement wrong. Living in Greece and, when younger, swimming in the sea from end of May to beginning of November, I know that the large body of water , Corinth gulf , is much warmer in November than the small body of water of a connected sea lake. So large bodies of water store heat energy of the summer much better than small bodies.
It is interesting to see the temperature of the sea water in the weather reports all winter, the sea cools much less than air in the winter. The opposite is true in the summer. The variations is seen in these average sea temperature per month color scaled charts.