Question

P1. Consider treating severely burned humans by cooling their body in an air or water bath at 15 °C for 12-20 hours. An estimate of the heat transfer rate from the patient to such a bath is q,-125 kcal/(m2 hr) with a skin temperature of 25 °C, while the normal rate is q,-50 kcal/(m hr) when the skin temperature is 34 °C. Since more heat will be lost to the surroundings than under normal conditions, there will need to be augmentation of the patient's energy intake. For a typical patient of weight m-70 kg and height h-1.75 m, an empirical formula gives surface arca A(m2)-0.202m0 4251075. Estimate a) the extra required rate of energy input in keal/hr, La-2 and b) the rate of extra entropy generation in kcal/( K hr), SGer-So,-s," , for such a patient. You can take Tơ to be the skin temperature in each case.

Answer 1

Date: Sive weigtof pahent wa 10 Surface area (m2).三 0202. wnowzr how Face aea D 123 0202 x(0 I &УЗ.nt. Gar 125-kal/ni hr Area - | |25 X 1.843 z 230 .375 kcal/hr - 50 Keal Im nArea e 50 x 143 92 15 kcalh Reuedf a. 930 315 2.1S :138 225 Yoal/hs aion in venTe 8 nen 学 340e: 303. 398 302