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Author Topic: ventilation control  (Read 2647 times)

rahuljindal.66

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ventilation control
« on: December 10, 2014, 08:44:47 am »

Hi Guys,

How to model ramp up the ventilation using heat detector???

For example,

fan is running @5m3/s until the heat detector detects the temperature 80 C. and as heat detector detects 80 C the fan should run at 10m3/s

Can this be done in pyrosim.
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Richard O'Konski

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Re: ventilation control
« Reply #1 on: December 10, 2014, 10:25:41 am »

Yes, you can model this using PyroSim.

Here is what you will need:
1) A heat detector that activates at 80 C.
2) Two HVAC Fan definitions. One fan will have a speed of 5 m^3/s and the other will have a speed of 10 m^3/s.
3) Three nodes and two ducts connecting the nodes in series. Each duct refers to a different fan.
4) The duct that points to the 5 m^3/s fan specifies an activation control that deactivates when the heat detector trips.
5) The duct that points to the 10 m^3/s fan specifies an activation control that activates when the heat detector trips.

I've attached a simple model that shows how to do this. The only difference is that the fans have a lower speed (1 and 2 m^3/s) and the heat detector trips at a lower temperature. There is also a device that monitors the duct flow. You should see that the flow quickly ramps up to 1 m^3/s until about 5 s. Then it drops to zero and ramps back up to 2 m^3/s.
NOTE: This model was made using PyroSim 2014.4.1208, which you will need to open it.
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Richard O'Konski
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rahuljindal.66

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Re: ventilation control
« Reply #2 on: December 13, 2014, 11:51:32 pm »

Thanks for your valuable suggestion.

I want to extend my question, how this can be done for supply and exhaust ????
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Richard O'Konski

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Re: ventilation control
« Reply #3 on: December 15, 2014, 09:07:29 am »

To make a supply or exhaust, one of the vent nodes needs to be changed to an "Ambient Endpoint" node. The flow direction in the ducts then controls whether the remaining vent node will become a supply or exhaust vent.
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Richard O'Konski
Thunderhead Engineering