I am facing the issue you addressed three years ago, namely connecting an earthtube to an ERV. You said you would experiment with EMS. Could you dig into your archives and share with me this EMS program?
Many thanks in advance
Vincent
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On Sat, Jul 13, 2013 at 7:46 PM, Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx> wrote:
Dolf,Â
Thanks!ÂProblem solved, looks like I had my controls for min and max temperatures setup in a way that was not having the system work. I mis -interpreted the IO reference, as it uses 20c for both... I guess in the future I will consult an example file to double check the IO ref... Below is the working inputs.. Now I will experiment with EMS to use the earth tube for Outdoor Air SystemNode Conditions so that I can feed my earth tube air to the ERV and 2 stage cooling coil with humidity control.. (I may have another post if I run into trouble with EMS) ÂZone Name 1TopFloor:Zone1Schedule Name 2Design Flow Rate 1Minimum Zone Temperature when Cooling -10Maximum Zone Temperature when Heating 30Delta Temperature 0.1Earthtube Type INTAKEFan Pressure Rise 400Fan Total Efficiency .9Pipe Radius .2032Pipe Thickness 0.0100000000152Pipe Length 30.48Pipe Thermal Conductivity 49.9999999996Pipe Depth Under Ground Surface 2.4384Soil Condition HeavyAndDampAverage Soil Surface Temperature 9.760938644409Amplitude of Soil Surface Temperature 14.012404441833Phase Constant of Soil Surface Temperature 19Constant Term Flow Coefficient .606Temperature Term Flow Coefficient .020199999Velocity Term Flow Coefficient .00059800001Velocity Squared Term Flow Coefficient 0
Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951 Â
On Sat, Jul 13, 2013 at 1:34 AM, Dolf Bakker <dolfbakker@xxxxxxxxx> wrote:ÂHello Jermiah,ÂThere is an example file availabe. EarthTubeSimpleTest.idfÂalso, have a look at this fileÂÂCheers,ÂDolfOn Sat, Jul 13, 2013 at 8:44 AM, Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx> wrote:
ÂDear list,Â
I still am not finding any reason this earth tube is not working> Am I suppose to connect it to the HVAC system using nodes? The documentation does not specify so it seems unlikely.. Attached is the file, any help would be very appreciated. Interestingly, the outputs for earth tube reporting do not cause a warning, so apparently the model is doing something, just not anything useful...Thanks for any help on this one and kind regards.Â
Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951 Â
On Fri, Jul 12, 2013 at 7:52 PM, Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx> wrote:
Hello,ÂMy model with earth tube cooling is not showing any results from earth tube output variables. The inputs I am using seem reasonable and I have read the reference Is this object suppose to connect to the HVAC with nodes? I can send the IDF if anyone is willing to take a look and have pasted the object below.ÂZone Name 1TopFloor:Zone1Schedule Name 2Design Flow Rate 1.83002825566061E-02Minimum Zone Temperature when Cooling 22Maximum Zone Temperature when Heating 21Delta Temperature 1Earthtube Type INTAKEFan Pressure Rise 350.0Fan Total Efficiency 1Pipe Radius 0.304800000001219Pipe Thickness 0.02Pipe Length 30.4800000001219Pipe Thermal Conductivity 200.0Pipe Depth Under Ground Surface 3.5Soil Condition HeavyAndDampAverage Soil Surface Temperature 9.760938644409Amplitude of Soil Surface Temperature 14.012404441833Phase Constant of Soil Surface Temperature 19Constant Term Flow Coefficient 1Temperature Term Flow Coefficient 0Velocity Term Flow Coefficient 0Velocity Squared Term Flow Coefficient 0
Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951 Â
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Posted by: vincent lacour <vlacour@xxxxxxxxx>
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