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Comparison of different controling strategies of an integrated ground source energy system operated in a passive office building

Due to the increasing pressure from energy-saving and emission reduction, buildings of Ultra-low energy targets and Near-zero energy targets based on passive techniques are promoted rapidly in China. As the final link of building energy conservation, the efficient operation and control of energy systems are quite important for passive buildings. In this paper, as for the well-used integrated ground source energy systems, physical simulation and actual measurements are carried out to compare the adaptability of different operation strategies. Specifically, after calibrated via measurements, three typical controlling strategies are simulated and compared, including temperature control, temperature difference control and timing starting control. When making comparison, indexes of Predicted Mean Vote (MPV) and Predicted Percentage Dissatisfied (PPD) are adopted. Finally, by comparing the thermal comfort and energy consumption under different control strategies, the optimal operation strategy of different seasons was suggested for passive buildings in the cold region of China.