Hot Water: Difference between revisions
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*Earth temperature is constant 30' below surface - this is called the mean earth temp. [https://www.builditsolar.com/Projects/Cooling/EarthTemperatures.htm]. | *Earth temperature is constant 30' below surface - this is called the mean earth temp. [https://www.builditsolar.com/Projects/Cooling/EarthTemperatures.htm]. | ||
*Earth temp varies significantly with seasons - to full seasonal variation - at surface. [https://www.builditsolar.com/Projects/Cooling/EarthTemperatures.htm], Thus, water pipes, at 3' or so below, show large variation of seasonal temperature. | *Earth temp varies significantly with seasons - to full seasonal variation - at surface. [https://www.builditsolar.com/Projects/Cooling/EarthTemperatures.htm], Thus, water pipes, at 3' or so below, show large variation of seasonal temperature. | ||
*Human body is 98-100F. <strike>Anything higher than body temp feels warm.</strike>. No, it's about the temperature of the skin - which is around 32C (90F). Thus, the absolute minimum shower temp must be 90F for it not to be uncomfortable. [https://www.google.com/search?sxsrf=ALeKk026QG9BbsZl0rNsBS9KmerMgczY_w%3A1602863734253&source=hp&ei=dsKJX6q8DJDYsAXHkpG4Cw&q=human+body+temperature&btnK=Google+Search&oq=how+to+configure+nvidia+geforce+gtx+1650+super+on+linux+mint&gs_lcp=CgZwc3ktYWIQAzIFCCEQoAEyBQghEKsCMgUIIRCrAjoOCAAQ6gIQtAIQmgEQ5QI6DgguELEDEMcBEKMCEJMCOggILhDHARCvAToLCC4QsQMQxwEQowI6CAgAELEDEIMBOggILhCxAxCDAToFCAAQsQM6AggAOgQIABAKOgYIABAWEB46CAghEBYQHRAeOgcIIRAKEKABUMsQWOmzAWD8tAFoBnAAeACAAeQGiAGhS5IBDTExLjQ3LjMuMi42LTGYAQCgAQGqAQdnd3Mtd2l6sAEG&sclient=psy-ab&ved=0ahUKEwiqz4DcvLnsAhUQLKwKHUdJBLcQ4dUDCAk&uact=5] | *Human body is 98-100F. <strike>Anything higher than body temp feels warm.</strike>. No, it's about the temperature of the skin - which is around 32C (90F). Thus, the absolute minimum shower temp must be 90F for it not to be uncomfortable. [https://www.google.com/search?sxsrf=ALeKk026QG9BbsZl0rNsBS9KmerMgczY_w%3A1602863734253&source=hp&ei=dsKJX6q8DJDYsAXHkpG4Cw&q=human+body+temperature&btnK=Google+Search&oq=how+to+configure+nvidia+geforce+gtx+1650+super+on+linux+mint&gs_lcp=CgZwc3ktYWIQAzIFCCEQoAEyBQghEKsCMgUIIRCrAjoOCAAQ6gIQtAIQmgEQ5QI6DgguELEDEMcBEKMCEJMCOggILhDHARCvAToLCC4QsQMQxwEQowI6CAgAELEDEIMBOggILhCxAxCDAToFCAAQsQM6AggAOgQIABAKOgYIABAWEB46CAghEBYQHRAeOgcIIRAKEKABUMsQWOmzAWD8tAFoBnAAeACAAeQGiAGhS5IBDTExLjQ3LjMuMi42LTGYAQCgAQGqAQdnd3Mtd2l6sAEG&sclient=psy-ab&ved=0ahUKEwiqz4DcvLnsAhUQLKwKHUdJBLcQ4dUDCAk&uact=5]. From [https://www.reddit.com/r/explainlikeimfive/comments/15uim3/eli5_why_does_986_degree_water_feel_hot_if_thats/] | ||
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Revision as of 20:07, 3 March 2021
- Pain threshold for a human is 106F [1]
- If water is 60F year round from a supply - does 39F rise (see Tankless Electric Water Heater) suffice?
- 60+39= 99F.
- Average shower temp is 105F [2]
- This article says that 99F is better, so you potentially avoid eczema
- It appears that 120F water is a relic of long piping - the hotter the temp the quicker your water will get warm. But for on-demand, lower temperatures appear to be better.
- Thus - minimize piping length to point of use. [[Seed Eco-Home specification is keeping heater distance to within 4' of point of use.
- Earth temperature is constant 30' below surface - this is called the mean earth temp. [3].
- Earth temp varies significantly with seasons - to full seasonal variation - at surface. [4], Thus, water pipes, at 3' or so below, show large variation of seasonal temperature.
- Human body is 98-100F.
Anything higher than body temp feels warm.. No, it's about the temperature of the skin - which is around 32C (90F). Thus, the absolute minimum shower temp must be 90F for it not to be uncomfortable. [5]. From [6]