Surface Heat Transfer area of Square "CUBE" compared with Round "Tube" ,or "Shell"										in Inches and Inches square
													Comments
		"TUBE"  or "SHELL"								"CUBE"
							The Same					Compare
					"Tube" "Shell"		GAP			"CUBE"	"Cube" Improved	Cube Area- Tube Area
		Same			Cirumference				Same Flow	Width of Channel	Heat Transfer Area	Heat Transfer area
Inner R tube	Outer R tube	Flow Area	Area for flow		Heat Transfer		Hight of		Area for "Cube"	for the same area	of Square Design
		Inner Tube	Outer Tube		Area		Channel		in both fluids	of flow & same gap	top+bottom, no sides
		X	X						XX
=================		==================================================================================================================================================
							1" Gap is just too small to avoid blockage using Sludge
1	2	3.14	9.42		6.28		1		3.14	3.14	6.28	0.00
2	3	12.56	15.70		12.56		1		12.56	12.56	25.12	12.56
3	4	28.26	21.98		18.84		1		28.26	28.26	56.52	37.68
4	5	50.24	28.26		25.12		1		50.24	50.24	100.48	75.36
5	6	78.50	34.54		31.40		1		78.50	78.50	157.00	125.60
							2" Gap  is the Minimum of Minimum to avoid blockage using Sludge
2	4	12.56	37.68		12.56		2		12.56	6.28	12.56	0.00
3	5	28.26	50.24		18.84		2		28.26	14.13	28.26	9.42	most common
4	6	50.24	62.80		25.12		2		50.24	25.12	50.24	25.12	most common
5	7	78.50	75.36		31.40		2		78.50	39.25	78.50	47.10
6	8	113.04	87.92		37.68		2		113.04	56.52	113.04	75.36
7	9	153.86	100.48		43.96		2		153.86	76.93	153.86	109.90
							3" gap clearance is good for Non Plug
3	6	28.26	84.78		18.84		3		28.26	9.42	18.84	0.00
4	7	50.24	103.62		25.12		3		50.24	16.75	33.49	8.37	most common
5	8	78.50	122.46		31.40		3		78.50	26.17	52.33	20.93	most common
6	9	113.04	141.30		37.68		3		113.04	37.68	75.36	37.68	most common
7	10	153.86	160.14		43.96		3		153.86	51.29	102.57	58.61
8	11	200.96	178.98		50.24		3		200.96	66.99	133.97	83.73
4	8	50.24	150.72		25.12		4		50.24	12.56	25.12	0.00
5	9	78.50	175.84		31.40		4		78.50	19.63	39.25	7.85	most common
6	10	113.04	200.96		37.68		4		113.04	28.26	56.52	18.84	most common
7	11	153.86	226.08		43.96		4		153.86	38.47	76.93	32.97
X	The "Tube" Heat Exchanger, has as a rule DIFFERENT Flow Area in the Inner and Outer tubes, It may create too high or too low velocity in one of the tube, which can reduce the Heat Transfer.
XX	The "Cube" Heat Exchanger has as a rule the same Flow Area for Cold and Hot Fluids (optional different sizes), this as a rule creates better Designed and controlled Heat Transfer.
	Also the "Tube" or "Shell" type Heat Exchangers are not as stackable, compact as Flat Heat Exchangers, therefore usually the "Cube" Heat Exchanger is much smaller .