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determining heating and cooling in peak conditions

asked 2017-12-10 17:32:22 -0500

Jenny gravatar image

updated 2017-12-11 02:32:46 -0500

I'm a student Engineer and I am new with EnergyPlus. I am doing a simulation to obtain the heating and cooling loads in peak winter and summer conditions. I am doing the simulation setting through the class: "SizingPeriod:DesignDay" the worst winter day (by considering no internal heat gains and no solar radiation) and the worst summer day(by considering internal and solar heat gains). The building has two thermal zones and the HVAC system is ideal.

I do not know how to proceed. The first question is: since, as prescribed by the UNI EN 12831 for a winter design day, I should set a constant temperature throughout the day (-8°C for my location), where I can set this value (and also considering solar radiation equal to zero)? Should I not use the Weather File? Moreover, Should I consider the design day in the SizingPeriod class or set it also in the section RunPeriod (by selecting also system sizing)?

The last question is: Can I run a simulation for these two different days and obtaining the required values of cooling and heating loads or should I run them separately?

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answered 2017-12-11 04:20:52 -0500

You can do both with one simulation, just adding 2 SizingPeriod:DesignDay objects, one for winter and one for summer. The temperature should be set in the Maximum Dry Bulb Temperature field. If the "Daily Dry-bulb Temperature Range" is set to 0, the temperature will be constant throughout the whole day (otherwise it will be sinusoidal). For solar radiation, you should set Sky clearness to 0 for winter and to 1 for summer (be sure that the solar model indicator is ASHRAEClearSky). However, in the Input Output Reference you will find all the information you need.

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Thank you for your answer!

Jenny gravatar imageJenny ( 2017-12-11 10:10:09 -0500 )edit

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Asked: 2017-12-10 17:32:22 -0500

Seen: 190 times

Last updated: Dec 11 '17