[JobNick]

Hey all,
I don't know how to solve this one:
Human body produces 150 Kj of heat per Kg of body weight through metabolic processes. Human body is open system, and the main mechanism for loosing heat is water vapor. Whats is the water volume (in liters) that has to be vapored every day to keep the same body temperature of a parson whose weight is 76 Kg. Hv = 40.65 Kj (Enthalpy of vaporization) and water density is 1 g/mol.

[sjb]

Hey all,
I don't know how to solve this one:
Human body produces 150 kJ of heat per Kg of body weight through metabolic processes. Human body is open system, and the main mechanism for loosing heat is water vapor. Whats is the water volume (in liters) that has to be vapored every day to keep the same body temperature of a parson whose weight is 76 kg. Hv = 40.65 kJ (Enthalpy of vaporization) and water density is 1 g/mol.

1) How much heat does this body produce?

[JobNick]

150 Kj/Kg * 76 Kg = 11400 Kj (kilojoules)

[sjb]

150 Kj/Kg * 76 Kg = 11400 Kj (kilojoules)

What are the units of your enthalpy of vaporization?

[JobNick]

Kj = Kilograms, Kj = kilojoules.
So it would be:
Person weight: 76 kilograms
Water Enthalpy of vaporization = 40.65 kilojoules
Human body heat production: 150 kilojoulesof heat per kilograms
water density is: 1 gram/mol

[sjb]

Kj = Kilograms, Kj = kilojoules.
So it would be:
Person weight: 76 kilograms
Water Enthalpy of vaporization = 40.65 kilojoules
Human body heat production: 150 kilojoulesof heat per kilograms
water density is: 1 gram/mol

Not quite sure what it is you're doing here, can you explain?

I was trying to get you to convert the 11400 kJ given off by metabolic processes into some amount of water vaporised.

[JobNick]

Actually I didn't do anything. I've just wrote the questions data in rows.

[Furanone]

I was with you both until I wasn't