Experimental Investigation of the Effects of Helical Roof on the Performance of Stairmand High Efficiency Cyclone

Table 3

Calculated cost-effectiveness for standard roof and helical roof cyclones.

Parameters	Cyclone designs
	SD	HRD	SD	HRD	SD	HRD
Inlet velocity	10		13.5		17
Inlet PM load, kg s^−1	3.03		4.09		5.15
Cost-effectiveness, Wh ton^−1 PM	28.4	24.4	49.0	38.8	75.1	60.8
Cost reduction by helical roof	14.1%		20.8%		19.0%

Cyclone designs are SD for standard design and HRD for helical roof design.