Thermal Analysis and Structural Optimization of High-Efficiency Fuel Submersible Hot Water Machine

Table 5

Convection surface structure parameter table.

Project name	Code name	Unit	Value
Threaded pipe pitch	t	mm	45
Threaded pipe groove depth	ε	mm	2
Threaded pipe inner diameter	dr	mm	29.5
Number of threaded pipes	Nr	—	16
Longitudinal scour length of threaded pipe	L	M	0.7
Front and rear smoke chamber diameter	ds	mm	520
Longitudinal scour length of smoke chamber	L′	M	0.4