Ideal Air Loads in Open Studio
I am a Trace 700 user. I am making test models while learning Energyplus. I am establishing a workflow turning on Ideal Air Loads from the Openstudio application and make an initial simulation to test geometry. After the initial simulation, in the HVAC Sizing Summary Report I am getting cooling loads about 1/3 lower from the ones calculated with Trace 700 for the same case. However, in another simulation after defining air loops and plants in Openstudio, the sizes in the Equipment Summary Report are in line with the load calculations in Trace 700 for the same case. However, in Energyplus the loads from the HVAC Sizing Summary Report are still 1/3 from the sizes in the Equipment Summary Report. I will appreciate to know why this happens! Thank you.
I believe this post may help here
I have read that post before making my question. And I made a test with a separate simulation with an idf file in the Energyplus engine. In my test I included the Outdoor Air Loads object within the Ideal Loads Object. And still got the same results: Ideal Cooling Loads around 1/3 of the ones calculated with Trace 700 for the same case.
I'm working with Trace 700 and EnergyPlus (Open Studio) for 2 years. The problem with difference of the thermal load between two softwares always was a problem. At present, we are working in a simulation to LEED, and the results OpenStudio are 50 TR while the results of TRACE 700 are 150 TR, exactly 1/3. I'm already considering ventilation loads in Open Studio because I am reading the Evaporator Colling Load of the chiller. Really, I don't know no more what is happening. Maybe, other person that have more experience and success with two softwares could analyse the models to suggest corrections
Another consideration is important ... the thermal load obtained by Trace 700 is usually much closer to our estimates for HVAC projects in our localities, where the climate is hot and humid is high.
Exact Carlos! I'm working this way, but it has generated many questions because my chiller is with a super sized capacity. About IdealAirLoads feature, it will not consider the loads of ventilation because IdealAirLoads analysis is to evaluate only the charges for the space itself, it does not look at the impact of air to pass through the HVAC system. Some topics already treat it in this forum and will clarify it better. It is also useful to clarify the InputOutputReference manual. I suggest using a hypothetical air conditioning system to analyze the actual heat load to be removed by the coil.