Openstudio Set a temperature and have heating/cooling run freely

asked 2018-02-12 18:12:29 -0600

lboskic gravatar image

Hello all,

I was wondering if it's possible to select a certain temperature (lets says 23 C) for a thermal zone/area in your construction (In my case a house). I essentially want it to be that temperature but I want to let the heating and cooling run freely.

Long story short, I want to see the Watts that are produced from the heating and cooling units but not have a specific set point for cooling or heating but rather have a specific temperature I want to be achieved based on the loads/outdoor temperature.

If this isn't possible, is it possible to somehow have set Watt consumption for heating and cooling units? So can I control the amount of power being provided to the heating and cooling unit as I wish? (I want to control the unit with my specific power indication)

Thank you

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I'm not sure I understand the question. If you have a heating/cooling unit, and you place a zone thermostat with a given temperature, the HVAC unit will work to maintain the setpoint based on the actual load of the zone, and you can report the wattage drawn. I must be missing something here?!

Julien Marrec gravatar imageJulien Marrec ( 2018-02-13 02:41:37 -0600 )edit

I'm a bit confused as well, I thought maybe @lboskic didn't want a dead band, and just wants 23C for both heating and cooling, I have not tried, that but if it can put in a small dead band and get pretty much what you want.

David Goldwasser gravatar imageDavid Goldwasser ( 2018-02-13 22:01:16 -0600 )edit

I would want it to be 23C for both heating and cooling. So I would want the heating to adjust itself based on outdoor temperature, loads, etc. if it fell under 23C but stay directly at 23C. The same thing for cooling then, so if it's hot outside it want the cooling to kick in and get the temperature to 23C. Based on this, either the heating or cooling would be working pretty much all the time in order to keep that set temperature inside a room (23C)

lboskic gravatar imagelboskic ( 2018-02-14 14:28:52 -0600 )edit

@lboskic do you get an error if you set both thermostats to 23C? If you do, what happens if you set it to 22.8 for heating and 23.2C for cooling?

David Goldwasser gravatar imageDavid Goldwasser ( 2018-02-14 15:51:10 -0600 )edit

Having a short deadband you can get problems of simultaneous heating and cooling, but note you can always turn off heating or cooling when you don't need it. One easy way is to use a coil availability schedule (you can assign a schedule yourself based on time of year, or preprocessed looking at the EPW file conditions, or you can use EMS to actuate the schedule)

Julien Marrec gravatar imageJulien Marrec ( 2018-02-15 02:55:08 -0600 )edit