KB7003 - Method for Modeling Energy System - Simulation Model Describing the Dynamic Response of an Energy System - Modeling Assignment Help

Assignment Task

Learning Outcomes:
MLO1: Select and defend an appropriate method for modeling a given energy system.
MLO2: Explain the limitations and weaknesses of the method used.
MLO3: Successfully design, build and use a simulation model describing the dynamic response of an energy system.
MLO4: Critically evaluate and explain the results obtained from a dynamic simulation model of an energy system.
MLO5: Explain the benefits and limitations of dynamic simulation modeling compared with conventional professional design practice.

Outstanding: All tasks have been addressed. Results are sound, very well presented, easy to read and interpret, and completely without ambiguity. The analysis and discussion include a level of reasoning and interpretation which demonstrate an outstanding understanding of the issues and is underpinned by appropriate and well-argued references from the literature. The work is exceptionally well presented.

Excellent: All tasks have been addressed. Results are sound, very well presented, easy to read and interpret and completely without ambiguity. The analysis and discussion include a level of reasoning and interpretation which demonstrate a lucid understanding of the issues. The work is very well presented.

Good means: All tasks have been addressed. The results are sound and well presented. The analysis and discussion are clear and appropriate. The work is presented with clarity and sound structure.

Satisfactory means: Most of the tasks have been addressed. Results are reasonable and, though the presentation is acceptable, it lacks clarity and certainty in parts. The analysis and discussion address the issues but are vague in parts, or insufficient in substance, or contains speculation. The work is presented with acceptable clarity and sound structure.

Unsatisfactory means: Results/input data contain serious errors and/or are illegible and/or the work is largely incomplete. The analysis and discussion of results lack substance. The presentation lacks clarity and structure.

Briefing Notes:

Making (and stating) all assumptions, design and develop a thermal model of a simple ‘test’ building using DesignBuilder. The building should be of your own design using the following criteria:-
- Single story flat roof
- 6 thermal zones (rectangular based zones please – no curves or angles other than 90o )
- Total building floor area should be at least 450m2 but no more than 650m^2

Assume that the perimeter glazing is clear double (air-filled cavity) occupying 35% of the continuous perimeter. You should make reasonable assumptions about all dimensions including floor to ceiling height. Two weather files will be made available to you: A ‘control’ weather file which represents a typical current pattern of weather data and a future weather file that represents a prediction of weather data in 2080 based on a ‘medium’ carbon emissions scenario.

TASK 1 – free-float
Develop your building model making choices of construction materials that just meet the requirements of the 2010 Part L Building Regulations. Make (and state) reasonable assumptions regarding allowances for occupancy, lighting, casual heat gains, infiltration and fresh air ventilation allowances and the usage schedules attached to these variables. For all of these considerations, you are encouraged to use the in-built databases in DesignBuilder where practicable. When your model is complete, simulate the free-float internal temperatures and extract and present results for ONE keyspace (of your choice). The free-float temperatures are those that would exist in the presence of normal building usage but without any plant (heating or cooling) inputs whatsoever. The temperatures you extract should be the operative results. Select a suitable peak summer and winter week as a basis for the presentation of your results. Generate the first set of results for this task using the ‘control’ weather file and a second set
using the future weather data. Plot the results for both weather files on the same graph axes for a direct comparison.

Task 1 Summary:  No Heating or Cooling (also No Natural Ventilation), Peak Operative Temperatures for a typical winter week and a typical summer week for both weather files for one keyspace

Task 2: heating and summer comfort
Now ‘switch’ heating plant on. Apply (and state) suitable choices of winter heating set point in all relevant spaces together with appropriate and fully-defined heating plant settings. Impose a 3 air change per hour scheduled natural ventilation rate to come on during warm summer months when the internal temperatures are above the heating set points. Re-run your model using both weather files and extract heating plant profiles for your winter sample week, together with freefloat operative temperatures during the summer week. Go on to extract the annualized total energy usage due to the heating plant.

Task 2: Summary: Heating on, Cooling off, Natural Ventilation on in summer only. Peak operative temperatures for typical summer week for one keyspace (2 weather files). Heating plant load for typical winter week for one keyspace (2 weather files). Annual heating load for the whole building (2 weather files).

TASK 3: cooling
Now ‘switch’ cooling plant on taking care to re-set your natural ventilation profiles so that only constant minimum fresh air allowances are applicable during occupied hours. Apply (and state) suitable choices of summer cooling set points in all relevant spaces together with appropriate and fully-defined cooling plant settings. Re-run your model using both weather files and extract cooling plant profiles for your summer sample week. Go on to extract the annualized total energy usage due to the cooling plant.

Task 3: Summary: Heating on, Cooling on, no Natural Ventilation. Summer cooling plant profile for a typical summer week for one keyspace (2 weather files). Annual total energy use by the cooling plant for the whole building (2 weather files).

Task 4: implementation of changes
For this task please use and apply an appropriate heating and cooling system to the building. From your knowledge and analysis of the previous 3 tasks propose and apply two changes to the building to reduce its overall energy consumption in the future. Provide reasoning and argument of why you are making these particular changes. Initially analyze each of these changes in isolation to each other and then analyze the effects of the combination of these two changes on future building energy use. Use appropriate references to support your arguments.

Analysis and Discussion
Present your results in a clear and appropriately labeled graphical method. Demonstrate what you understand and what you have learned from the results (though take care to use an authoritative 3rd person past-tense format as if it were a professional report). Focus on the implications of a changing climate on design decisions taken today for new building proposals. Remember that many buildings planned for construction or refurbishment today might be expected to still be in use in 2080. What practical advice can be given to designers, constructors, and building users to respond to the challenges likely to arise from evolving improvements to construction standards and a changing climate?

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