Abstract
In this work, measured energy use of the building space heating, ventilation supply air heating, appliances and lighting is compared against simulated energy use modelled in IDA ICE. As built energy need and detailed measured input data is applied in building model calibration procedure. Calibrated building model energy performance is studied in both measured and test reference year climate conditions. Previously modelled as built plant automation and implemented control logics are compared against measured. Geothermal plant in this study consists of heat pump, solar collectors, boreholes and energy piles. Heat pump SCOP estimated by post processing according to heat pump manufacturer’s performance map is compared against measured SCOP on the monthly basis. Opinion on actual plant operation is given and energy performance improvement potential is quantified. Important parameters for successful building model calibration are presented. Building compliance with Finland NZEB requirements are assessed. The results show good match with measured energy use after the model calibration.
Highlights
According to European Parliament directive 2010/31/EU [1] all new buildings built from January 2021 are to comply with nearly zero-energy buildings (NZEB) national requirements
Geothermal energy utilization is mainly performed with a ground source heat pump (GSHP) and according to a review on worldwide application of geothermal energy [2] total installed worldwide GSHPs capacity has grown 2.15 times in the period of 2005 to 2010 and 45% from 2010 to 2015, application of GSHP is registered in 82 countries around the globe
Reda [6] studied the benefits of solar thermal storage numerically in a GSHP plant with a borehole field type ground heat exchanger (GHE), where application of solar thermal storage helped in improvement of GSHP plant seasonal coefficient of performance (SCOP) from 1.6 to 3.0
Summary
According to European Parliament directive 2010/31/EU [1] all new buildings built from January 2021 are to comply with nearly zero-energy buildings (NZEB) national requirements. Meeting NZEB requirements considers application of renewable energy sources such as geothermal and solar in the design. To maintain stable long-term operation of GSHP plant and improve geothermal energy yield along with seasonal coefficient of performance (SCOP), a source of thermal storage to be considered in the plant design. Reda [6] studied the benefits of solar thermal storage numerically in a GSHP plant with a borehole field type ground heat exchanger (GHE), where application of solar thermal storage helped in improvement of GSHP plant SCOP from 1.6 to 3.0. According to results of such thermal storage application, overall size of borehole field was reduced by 47% compared to the same capacity single borehole field plant without thermal storage
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