The Ontology-Based Approach Supporting Holistic Energy-Tunnel Design considering Cost, Heat Flux, and System Feasibility

Table 3

Details of six design schemes.

Design scheme	Segment ring		The pipe of heat exchanger			Connection pipe		Main conduit
	Number	Radius (m)	Exchanger type	qexchange (w/m^2)	Length (m)	Number	Length (m)	Number	Length(m)
TY-ET-3-air	3	6.1	Air	18	180	2	200	2	6
TY-ET-4-air	4	6.1	Air	18	180	2	200	2	8
TY-ET-3-ground	3	6.1	Ground source	30	180	2	200	2	6
TY-ET-4-ground	4	6.1	Ground source	30	180	2	200	2	8
TY-ET-3-air-ground	3	6.1	Dual	36	360	2	200	2	6
TY-ET-4-air-ground	4	6.1	Dual	36	360	2	200	2	8