This question is inspired by our fortnighly challenge!
In the Kingkiller Chronicle, there is a type of magic called "sympathy." This magic works by magicians setting up an energetic "link" between objects. Energy is transferred from one object to another through the link. The magic user needs some source of energy (usually a fire, candle, or sometimes their own body's thermal energy, but not always thermal energy) and connects it to something to achieve some effect. For instance, the protagonist gives an individual a "hot foot" by forming a magical connection with the person's foot with something like a voodoo doll, and moving the voodoo doll's foot over a candle. Thermal energy went from the candle, to the doll, through the link (with energetic losses), and into the person's foot.
There are few points in the book where the protagonist uses his own body's thermal energy for magic effects. Since he is using his body's own heat energy, he suffers what is known as "Binder's Chills," or magically induced hypothermia. As an additional layer of "realism," the author included losses during this energy transfer.
Assuming a link with 2/5 energy efficiency (3/5 energy loss), what can an average mage, using sympathy, do with just their body's thermal energy without killing themselves via Binder's Chills? (See the summary below for specifics!)
I'm also aware of this related question and answers, but they do not go into specifics. I want to know how much energy (Joules are preferred) they can sap from their bodies without killing themselves, and what the maximum effects of the sympathy can be. We're looking for something like this question, but for this sympathy.
A summary of what you ought to consider in your answer:
- The mage you ought to consider has a normal body temperature. They are not already cold nor are they already hot.
- This mage is of average weight and size for Europe (the protagonist is a redheaded, pale-skinned male. The UK-Wales data for men in the link is ideal.)
- The binder's chills can induce severe hypothermia, but cannot drop the mage's body temperature below 29 degrees C or 82 degrees F.
- Sympathy takes energy evenly from the body, and you may consider a individual's body to have constant temperature throughout. (This is a simplification, but one I find reasonable.)
- This magical link transfers 2/5 of the energy put into it from the magician to the object. 3/5 of that energy is "lost" in maintaining that link. The energy is transferred through the link, for all practical purposes, instantly.
- This thermal energy can be converted into other types of energy. Consider the conversion costs as part of the lost energy in #5.
For sweet over-achievement: describe extreme situations by changing the weight or body temperature (due to exercise, etc.) of the mage!