Chemist in an engineering world- Heat Capacity of 600mL capacity Pressure Vessel
Chemist in an engineering world- Heat Capacity of 600mL capacity Pressure Vessel
(OP)
Hi all. I am a chemist currently working in an engineer's world. I have been tasked with obtaining the heat capacity of a 600mL pressure vessel that we will be using to conduct an array of experiments on. I have started with a known mass of water. The controller to the reactor is connected to a pc to record data (power output in Watts of the heater, temperature of the vessel contents, and the time at any point that each data point is created). How do I use this data to get the heat capacity of the reactor? Any help would be greatly appreciated.





RE: Chemist in an engineering world- Heat Capacity of 600mL capacity Pressure Vessel
How are you allowing the water to expand?
How are you controlling pressure of the water, or will it be allowed to evaporate out of the container?
What pressure of the unit?
How are you heating the container?
What is the shape and weight of the container?
Where did you get your chemistry degree? 8<)
RE: Chemist in an engineering world- Heat Capacity of 600mL capacity Pressure Vessel
This is a fundamental problem all chemists would have been exposed in their chemistry and thermo. classes.
RE: Chemist in an engineering world- Heat Capacity of 600mL capacity Pressure Vessel
RE: Chemist in an engineering world- Heat Capacity of 600mL capacity Pressure Vessel
RE: Chemist in an engineering world- Heat Capacity of 600mL capacity Pressure Vessel
"We" (engineering, heat transfer, ME, or chemistry or chemical engineering!) cannot answer the question as written.
"Heat capacity" of a little bit of water? 600 ml of water - assumed at room temperature, then what?
What is the start temperature, what is the end temperature - is that end temperature now (uncooled ?) or (after cooling and after the reaction?) with how much water flow? For how big a flask - which may (or may not) have significant heat capacity itself in the metal, supports, and heat transfer (?) cooling pipes? What is the reason the flask needs to be cooled?
600 ml water is very, very small. And, the smaller the system, the bigger the "little" effects of its environment matter. Melting 50 tons of steel, I don't worry about the mass of the crane hook lifting the total mass. Heating 1/2 quart of water in a timed situation on a stove top from 25 deg C to 33 degrees C, I need to calculate the heat lost from the handle of the pot and figure the room temperature changes. maybe. Or maybe not.
I assume a reaction of some kind would be going on inside? What is the reaction and how much heat is being created? What is the allowable max temperature of the system? What margin is acceptable?
We know little more than " I have a car seat and want to go faster. How big an engine do I buy?" How can we help if we don't know your problem?
RE: Chemist in an engineering world- Heat Capacity of 600mL capacity Pressure Vessel
RE: Chemist in an engineering world- Heat Capacity of 600mL capacity Pressure Vessel