Classifications of HDH Systems HDH systems Closed air open...

Classifications of HDH Systems HDH systems Closed air open water (CAOW) HDH System Closed water open air (CWOA) Air heated system Water heated system Air heated system Open air open water air open (OAÓW) Water heated system Natural circulation Forced circulation Natural circulation Forced circulation Water heated system Air heated system Natural circulation Forced circulation

Transcript

00:01 So they ask us how do open feed water heaters different from closed feed water heaters? well, the basic difference is in an open feed water system, the fluids mix, but they do not in a closed feed water system.

00:12 So that's the basic difference, but from what the consequences of that difference are is that when you have two fluids that are mixing, you got to have them mixing at the same pressure, right? because you don't want one to be backflowing on the other.

00:26 So you kind of have these two mixing, they got to be at the same pressure.

00:30 They come in so that then they're same pressure as they go out.

00:35 So that means that you need the the water in the when you have this mixture, you got to make sure that you pump the water, the pressure in the, the, the pressure in the mixing chamber is the same as the pressure in the pump or in the, let me see, in the, let me see, in the, let me see, let me see, let me see, let me see, let me see here.

01:04 Let me make sure i got them saying this way.

01:06 I need to look at the picture here.

01:08 I should have just drawn the picture here.

01:10 So on the problem, and let me actually draw it for you.

01:13 If i can find the picture, let's see here.

01:21 That's not going back far enough.

01:24 Let's see here.

01:25 I'm just trying to find the picture in the book so i can draw a nice little picture for you.

01:29 Okay, yeah.

01:30 So in the open, we have turbine, bring it off here, feed water, pump, condenser, and then we have coming out of here, going to another pump, and then going to the boiler, and then going into the turbine.

02:02 So what we need here is we need the pressure, we need these two pressures.

02:12 To match.

02:13 We don't want stuff flowing back into the turbine, and we don't want to stuff flowing back into the pump.

02:19 So we need to have these two pressures match, which needs we need that this pressure is going to be much lower than this pressure.

02:26 So we've got to pump this up so that then they can mix together and then come out here and then pump it up again to the pressure that we want in the boiler.

02:39 Now in the other case, let me actually draw that picture for you.

02:46 That's a little bit, a little slightly different...

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