00:02
A tank contains ammonia at a given state, and it is attached to a line with ammonia flowing at a different state.
00:11
When the valve is open, the mass flows in until the tank is half full of liquid.
00:16
We want to calculate the heat transferred from the tank during this process.
00:22
So if we take the tank as our control volume, this is a transient process as flow comes in.
00:29
So let's look first at state one.
00:32
So at state 1, we will look at our table between 20 and 30 degrees celsius, and we'll find firstly, the initial specific volume of state 1 v1 to be 0 .9552 cubic meters per kg.
00:55
The specific internal energy at the state, u1, is equal to 1 ,380 .6 kilojoules.
01:05
With kg.
01:09
And the massive ammonia in the state m1 is equal to the total volume of the tank v over the specific volume, little v1, and that's 1 divided by 0 .9552.
01:27
And so the massive ammonia initially is 1 .047 kg.
01:36
So that's our detail.
01:39
Our data for state 1.
01:41
Now for state 2 we have 0 .5 cubic meters of liquid and 0 .5 cubic meters of vapor.
01:49
So we go back to our tables and we find firstly the specific volumes for each.
01:56
For liquid bf we have a specific volume of 0 .001658 cubic meters per kg.
02:09
And for the vapor ammonia very specific volume at this state at 25 degrees celsius to be 0 .12813 cubic meters per kg...