A Small-Sized HTGR System Design for Multiple Heat Applications for Developing Countries

Table 9

Major specifications of intermediate heat exchanger.

Parameters	HTR50S	HTTR
Thermal duty (MW)	20	10
Design life time (years)	40	20
Logarithmic mean temperature difference (°C)	76	101/113
Primary flow
Inlet temperature (°C)	900	850/950
Outlet temperature (°C)	670	387/389
Velocity (m/s)	12.6	9.3/8.1
Secondary flow
Inlet temperature (°C)	560	244/237
Outlet temperature (°C)	850	782/869
Velocity (m/s)	43.0	30.6/27.1
Heat transfer tubing
Material	Hastelloy XR	Hastelloy XR
Outer diameter (mm)	45.0	31.8
Wall thickness (mm)	5.0	3.5
Number of tubes	159	96
Helical tube bundle
Number of layers	9	6
Outer diameter (m)	2.24	1.31
Inner diameter (m)	1.20	0.84
Effective heat transfer area (m^2)	500	215