Re: [TRNSYS-users] Utilizing water draw forcing function

[afolayan ayoola <afolayan_ayoola@yahoo.com>]

hello,

         I am modeling a solar domestic water heating system. I want to create a scenerio whereby certain amount of water(like 21L) will be drawn from a tank of 121L at a particular time (say 7am) at a flowrate of 300kg/hr and also 42L of water  is being drawn again from the tank at 7pm in the night with the same flowrate. I connected the type 14b forcing function output to the inlet flowrate of the tank to control how the water is being used. I run the simulation for 2 days in January with a simulation timestep of 1hr. The draw rate and length of draw was specified (type14b) and the last point was set at 24hrs. The result am getting is not even close to what i was expecting because it seems the water is being used continously. Please i will like to know what am doing wrong.

          I have attached the captured image of my component setup and simulation graph for your referal.

Thank You

Best Regards

Ayoola Afolayan

 

On Friday, October 25, 2013 11:02 PM, Jeff Thornton <thornton@tess-inc.com> wrote:

Use a Type 14 forcing function and specify the draw rate and length of
draw.  Make sure to close the cycle out (the last point should be at 24
hours so it repeats every 24 hours.  Then connect the output from Type
14 to the inlet flow rate for the inlet port and you're ready to go.

Jeff

---

On 10/25/2013 2:15 am, Ayoola Afolayan wrote:

>> Hello Everyone,
>>                        I am modelling a solar domestic water
>> heating system using the following component: Pump(type 3b),
>> Controller (type 2b), Collector (type 1b), tank (type 4a) and weather
>> on TRNSYS 16. I want to determine the volume of water that is being
>> drawn from a storage tank for example: 24L of water drawn from a
>> storage tank of 120L capacity at 7am and the same volume of water
>> drawn at 9am. I will like to know which component in TRNSYS can
>> perform this task and how?

>>

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Attachment: Components assembly.PNG
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Attachment: Simulation Graph.PNG
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