Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
In this thesis, input data for energy performance calculations on commercialpremises have been studied. In energy performance calculations, where internal heat gain parameters are unknown, template values that, in a reasonable way represent the activity in the room, are necessary. These values can be used as input data for whole-year calculations, or for calculations on shorter periods of time.
The purpose of the Sveby project is to create standardized work practice in energy issues for the construction industry. The work in this thesis is conducted to correlate with the purpose of the Sveby project, with aims of contributing with information and guidelines for the continuing work with commercial premises.
In this report, suggestions for template values for internal gains parameters, based on research and calculations in the field are presented. Suggestions on how these can be implemented in a user-friendly way for two energy performance calculation software are also given, VIP Energy and IDA ICE. This is done in a manner so that it will be easy for users of energy performance simulation software to calculate similarly with respect to internal gains parameters.
Suggestions for template values for some types of non-residential buildings are presented individually in chapter 4, and tabled in appendix A.
The results for this study show that the energy calculations software, available on the Swedish market today, has a high degree of detail in the input parameters. In the Sveby project, there is a need to precise how these parameters should be considered for standardized use. For example, the Sveby guideline does not specify how convective/radiant/latent differentiation should be handled in energy performance calculations. The differences in these parameters often have a limited effect on the results in whole-year simulations. This thesis shows that this 4 question should, however, be handled to clarify this issue due to the fact that the simulation software has these options in the user interface.
A test of the template values have also been done, where a simple model has been built in IDA ICE and VIP Energy, which has been executed and analyzed for the purpose of, partly to demonstrate how the excel spreadsheet that has been created can be used in practice, and partly to investigate differences in calculation results between the different simulation software.
The results show that the system that has been created to handle user related internal gains gave similar results for both calculation software. Some adjustment of the system is, however necessary to achieve an as similar result as possible in the different simulation software. This is extra relevant for the internal gains from occupants, due to the difference in calculation algorithms that are used by the different software.
2014. , 135 p.