Conduct case study with primary and secondary system

[mwetter]

This issue is to conduct the case study with primary and secondary system.

The models are in obc/examples/case_study_4_fullHVAC, for instructions see the README.md file in https://github.com/lbl-srg/obc/tree/issue92_caseStudyFullHVAC/examples/case_study_4_fullHVAC

The development branch is issue92_caseStudyFullHVAC.

To do:

• Add VAV system model with building.
• Change the envelope model from the small office building to a floor of the medium office building.
• Correct heating supply temperature in idf file and reproduce sizing table, see Add sizing data for VAV for case study #101 (comment) [Yan]
• Update to Spawn version that properly sends QLat_flow from E+ to Modelica. #110
• Update to latest master of Buildings library (this will require updates to the controls as the master uses the revised version of CDL that refactors Add and some other blocks.
• Address comments on Issue92 case study full hvac #104 [Karthik]
• Make SystemModel.BoilerPlant to pass regression tests. [Karthik]
• Add condensing boiler model [Michael]
• Remove sampling that happens every 1 second in SystemModel.BoilerPlant.Validation.System (as of commit ff90d65) [Karthik]
• Add boiler plant to SystemModel.BoilerPlant.
• Add chiller plant to SystemModel.ChillerPlant.
• Add heat loss of distribution pipes. Use 1/2 inch Armaflex for pipes, assume valves etc are insulated.
• Add model that combines boiler plant, chiller plant and VAV system.
• Add post-processing script.
• Size air-side system.
• Size boiler plant.
• Size chiller plant.
• Make sure building static pressure is not higher than about 12 Pa. Otherwise add a relief fan.

[karthikeyad-pnnl]

I have submitted a PR with the required boiler plant files here. I have listed some additional questions there and would like some guidance about referencing the boiler plant controller classes.

This is merged