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| Questions | Answers |
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| What is the purpose of this ontology? | Development of the domain knowledge of energy tunnel to enrich the domain knowledge of conventional GSHP and to evaluate the design scheme of energy-tunnel systems from the macroperspective and, thereby, provide optimization guidelines to promote the optimal design scheme |
| What are the domain and scope of this ontology? | Tunnel engineering, GSHP system, and building HVAC |
| Main users of this ontology? | Tunnel designers and HVAC designers |
| What is the function of this ontology? | It is applicable to the feasibility evaluation and simple optimization carried out in the early stage of energy-tunnel design |
| What elements are involved in this ontology? | Tunnel structure, GSHP system, materials, etc., including heat pump type, pipeline, heat exchanger, lining, segment, and other details |
| What are the design variables of energy tunnel in this ontology? | The number of segment rings and type of heat exchange tube in the segment (such as air type, ground source type, and dual-purpose type) |
| What are the macroindicators to evaluate the energy-tunnel system? | The total cost, heat exchanged, and feasibility evaluation based on the heat flux provided by the system |
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