Question-and-Answer Resource for the Building Energy Modeling Community
| 2016-01-28 14:56:39 -0500 | commented answer | Unrealistic illuminance values @rpg777 Thanks again for your response. Probably there are some people facing the same problem or know how to handle this! |
| 2016-01-28 14:54:40 -0500 | received badge | ● Editor (source) |
| 2016-01-27 12:01:24 -0500 | commented answer | Unrealistic illuminance values Thank you for your comment! I used the IDF editor to make the model, that's probably why it won't run in Open Studio. The weather-file used is the weather file of Amsterdam from the DOE. I expected higher illuminance values, because the same room with a north-west orientation reaches values around 15.000 lux. The run period was one year with a timestep of 6 per hour. It's true that you see two daylight control points, but now I'm talking about the reference point at 1 m from the glazed facade. |
| 2016-01-26 18:51:43 -0500 | asked a question | Unrealistic illuminance values Currently I'm working on a one zone simulation model in EnergyPlus. The room has one glazed facade, south-east orientated. All other surfaces are assumed adiabatic. When I look to the illuminance levels at the daylight reference point, these levels stay pretty low. <500 lux during the winter and <1000 lux in summer. I checked my material properties and the 'solar distribution' is set to FullExterior. You can find the .idf file here. Is there something I forgot in my model? Or does anyone know the cause of this? Kind Regards, Bas |
| 2015-12-24 05:49:44 -0500 | commented question | CAV air system with constant temperature I want the air system to work constantly on 18oC with 60m3/h and a relative humidity range between 43-54%. |
| 2015-12-23 11:24:24 -0500 | commented answer | CAV air system with constant temperature @Aaron Boranian, thank you for your comment. However, I want to model an existing HVAC system. That's why I want to model it this way. Since this is not a standard solution, it is hard to model it in EnergyPlus. Do you know a way to handle this? |
| 2015-12-23 11:20:13 -0500 | commented answer | CAV air system with constant temperature @Eric Ringold, That's true. The climate ceiling has its own thermostat. However, the temperature in the zone is already above 18oC. So when my thermostat for the air temperature is set at 18 degrees, the air system wants to cool down the air. |
| 2015-12-23 10:19:40 -0500 | received badge | ● Student (source) |
| 2015-12-23 09:39:49 -0500 | asked a question | CAV air system with constant temperature I'm struggling for quite a while now with my simulation model in EnergyPlus. I hope someone can give me some advise how to solve this problem. A short description of my case: I'm modelling a one zone model with one window. The HVAC system consists of: - a climate ceiling with a constant temperature and a variable flow to provide both heating and cooling - a Constant Air Volume (CAV) ventilation with a constant volume of 60 m3/h with a constant temperature of 18oC with humidification and dehumidification The problem: The climate ceiling works well and provides the appropriate air temperature in the room. But when want to include the CAV ventilation this doesn't work out the way I wanted. I tried several options: IdealLoadAirSytem, model the system myself in different ways. But I didn't manage it to get it right. I think the problem is that the Air system wants to react on a certain thermostat. But in my case the airflow and temperature has to stay constant in a certain humidity range (43-54%) and don't have to react on the room temperature. In the graph below you can see that the dehumidification does not work. By setting a 'temperatureandhumidityratio' in the coil controller I tried to dehumidify the air but it seems not to work this way.
Here is a link to the IDF-file. |
