Ayoola -
If you want a step change in your profile you need to include an ending point for each period as well. See the "Begin" example project for an example of a Type 14 schedule.
Also your timestep will need to be at a maximum the size of your smallest schedule step. In your set-up you have the draw lasting 0.083 hours, so your timestep needs to be no bigger than 0.083 hours.
Trying creating a project with just a Type 14 and looking at the output on the on-line plotter until you get the output to look like you want the draw schedule to look.
Regards,
Tim
-- Timothy P. McDowell Executive Vice President Thermal Energy System Specialists, LLC 22 N Carroll St, Suite 370 Madison, WI 53703 608-274-2577
On 2013-10-31 09:26, afolayan ayoola wrote:
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 YouBest RegardsAyoola Afolayan
On Friday, October 25, 2013 11:02 PM, Jeff Thornton 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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