Re: [EnergyPlus_Support] Turn off cooling

This is important to know about mixed-mode simulation. I should mention however, that my attention is on analyzing indoor environment for a few cold months in the winter, when typically the heating system is on and there is little use of windows. Cooling is on in the typical default cooling seasons, but the runtime is limited to not include this timeframe. In various real and similar environments apartments with sensors are showing to not ever reach the setbacks of 62 deg F. Because of this, I am curious why in every simulation the setback is reached and there is not a slow or changing approach, it simply follows the line of the setback schedule. In actuality, at 8 am, the system shuts off until the room environment falls below 62 or 6 pm comes and heating turns on to reach the temperature it is below. In the case here, the temperature is at 70 and at 8 it goes to 62. I do not see any sign or reflection of elevated temperatures that are linger or decline different than the predicted schedule. It is an apt complex and apts in the upper floors seem to be doing the same following of the setbacks as the ones below. The midrise apt template is from building america project altered to be a brick envelope building. Not sure how simulation may be altered to reflect this actual pattern.

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On Jan 14, 2013, at 1:29 AM, Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx> wrote:

Not sure if I also need to put a high temperature like 100 or if this should have taken care of it. ?
This will not be necessary- so long as your availability schedule is set to 0 (off) you do not need to set to 100 (and do not want to if you are looking to see your setpoints not met as a way to check your nat vent cooling effectiveness)

Is adaptive comfort warning what you are referring? Then I review the output for warnings on comfort related to the the meeting new algorithm of the latest revision for ASHRAE 55?

I am saying is that you might want to use the adaptive version of ASHRAE 55 setup in the people object.

Setting a higher setpoint for cooling is still not clear, although the availability by month is.

I am saying that it is likely that you could save energy if your cooling only comes on at higher setpoints, but at the price of comfort-- it depends on what you consider comfortable- ASHRAE 55 80% is more comfortable than many current buildings actually are... You might want to check out the software-- climate consultant, it reads EPW and can suggest how effictive mixed mode nat-vent will be for your location.

  I have it off for the months of interest but still see that the setpoints are met exactly and surely the setbacks cannot be achieved like this without cooling effort.

Make sure that your cooling system is not using energy- then set your output varribles to check what is happening on the hourly levil, check zone temps, air flows, comfort calcs, setpoints not met ect. You might want to use D-View so that you can open three files at once-- make one file no cooling- one file mixed nat vent cooling and one all nat vent cooling. The open linked file feature allows you to view all of these factors at once and is very useful for model problem solving and design iteration.

Best of luck-

Jeremiah D. Crossett  | Senior Analyst  | Phase Change Energy Solutions
120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951

www.phasechange.com



On Sun, Jan 13, 2013 at 9:14 PM, <cgomez0000@xxxxxxxxx> wrote:

Ok thanks. Yes this IS where I set cooling as off originally. Not sure if I also need to put a high temperature like 100 or if this should have taken care of it. ?
Is adaptive comfort warning what you are referring? Then I review the output for warnings on comfort related to the the meeting new algorithm of the latest revision for ASHRAE 55? Setting a higher setpoint for cooling is still not clear, although the availability by month is. I have it off for the months of interest but still see that the setpoints are met exactly and surely the setbacks cannot be achieved like this without cooling effort. Is this possibly the way it performs and should expected?

Thanks,
Carla

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On Jan 13, 2013, at 11:13 PM, Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx> wrote:

In order to still see your setpoints not met for your chosen thermostat settings you will want to turn off your availability schedule.

Figure out what your cooling availability schedule is named by going to your cooling plant and finding the availability schedule name.

Go to the object called  "Schedule compact" and locate your cooling availability schedule, change the 1 to a 0

You can also find your setpoints in the schedule compact object. You might also want to turn on ASHRAE 55 adaptive comfort in the people object, then report this to HTML and csv. This  ASHRAE 55 adaptive comfort is for naturally ventilated spaces, and if you are doing mixed mode you might want to increase your cooling setpoints until you start getting large amounts of uncomfortable hours.

Jeremiah D. Crossett  | Senior Analyst  | Phase Change Energy Solutions
120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951

www.phasechange.com



On Sun, Jan 13, 2013 at 7:59 PM, <cgomez0000@xxxxxxxxx> wrote:

I opened the idf and saved it as a expidf. Then saved it as an idf. Should I open it again to see a change. Is this the same as typing cntlL.
Under zone HVAC Controls and Thermostats I have Zone Control Thermostats defined with object type Thermostat dual setpoint.

Then I have ThermostatSetpointDualSetpoint with HeatingSetpoint and CoolingSetPoint selected. I am not finding the cooling set point location. Am I doing this right? I searched in the expidf for coolingsetpoint in text editor.

Thanks for your help.
Carla

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On Jan 13, 2013, at 10:25 PM, Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx> wrote:

Set the cooling setpoint very high-- say 100C, or set your cooling availability schedule to 0. Either should still allow you to use the setpoints not met output to check your zone temps with reference to your set points.

Best-

Jeremiah D. Crossett  | Senior Analyst  | Phase Change Energy Solutions
120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951

www.phasechange.com



On Sun, Jan 13, 2013 at 6:33 PM, <cgomez0000@xxxxxxxxx> wrote:

My main question is
How can you completely turn off cooling so that you can see setbacks be reached (or not) related to natural conditions?

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