• Energy Demand

             - Space Heating

             - Hot water

             - Electricity

• Renewables Potential

• Mabie Farm Conclusion

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Mabie Farm Park - Energy Demand

Space Heating

Heat Losses

The following areas and U-values were obtained for the walls, floor, windows/doors and roof of the visitor centre/tearoom at Mabie Farm Park:

Figure 1. Building Areas and U-values

	U value (W/m2K)	Area (m2)
Walls	0.30	158
Floor	0.25	295
Windows/ Doors	2.00	30
Roof	0.20	328

The U-values adhere to the Scottish Building Standards Agency (SBSA) regulations at the time of the build (2000).

For heat losses to ventilation, the air changes per hour were assumed to be 2 ach for winter and 5 ach for summer based on SBSA recommendations.

Heat Gains

Values for the solar heat gains were obtained from the ASHRAE Fundamentals handbook for north, south, east and west facing doors and windows at a latitude of 56^o north. Heat Gains from people and equipment were also taken into account according to the energy demand methodology.

Energy Balance

Energy balances were completed for both the visitor centre/tearoom and the outdoor toilets for a heating hour period of 24 hours per day. Based on these calculations, the total annual estimated heating load was 45036 kWh.

The monthly breakdown of this is shown in Graph 1:

Graph 1. Mabie Farm Park Space Heating Requirement

The spreadsheet for the calculation of the space heating requirement at Mabie Farm Park can be found here .

 

 

References

• http://www.sbsa.gov.uk/tech_handbooks/th_pdf_2006/bsthnd-6.pdf
  
  
• ASHRAE Fundamentals Handbook: IP Edition. 1989. ASHRAE.