¶ B185 with plate count greater than 140 can be produced with connection on one side exclusively
B185 can be produced with connections on both side, up to 140 plates. For higher count of plates, all connections must be located on same side of the heat exchanger either front or back side due to production limitation.
¶ B30 has thermal performance deterioration at large number of plates. Verify BPHE selections using rating calculations
For B30, design calculation mode is most suitable for pressure drop limited cases. The user should use the rating calculations to dimension for a proper oversurface.
¶ Expect xx% greater L-side pressure drop if number of plates are greater than xxx in single pass arrangement
B30 and B60 are cross flow BPHEs with large pressure drop asymmetry. One circuit have lower pressure drop (L-side) and the other has higher pressure drop (H-side).
L-side = outer channels = F1/F4
H-side = inner channels = F2/F3
SSP-alias "L-H" refers to fluid side 1 on L-channels and vice versa.
For B30 the experimental tests have shown that the pressure drop on the L-side becomes higher than the SSP model shows when the plate number exceeds a certain amount. Please contact SWEP representative for further support.
¶ In condenser applications using B60 the refrigerant should enter through F2 port and leave through F3
B60 has cross-flow configuration instead of the parallel flow normally found in the BPHEs. Channels connected to ports F1-F4 have a pattern with low (L) chevron angle, while the channels connected to F2-F3 have a pattern with high (H) chevron angle and smaller ports.
L-side = outer channels = F1/F4
H-side = inner channels = F2/F3
A high chevron angle enables more efficient heat transfer, but to the expense of larger pressure drop. When applying B60 as condenser, it is therefore important that the refrigerant enters through F2 port and leaves through F3 port to reach the requested performance.
¶ If inlet temperature difference >100K, please mind start/stop conditions
The parameter "Largest wall temperature difference" is the single most important parameter to evaluate the risk for harmful thermal stresses, leading to thermal fatigue at repeated cycling. This parameter should not exceed 40 K, which it seldom does under steady state operation conditions. However, under change of heat load, such us start up and close down, the temperature profile may differ in such a way so that local high temperature differences occur. With phase change on one, or both sides, the risk is more pronounced.
Very high/low operation temperatures means the heat exchanger is subject to substantial thermal expansion/contraction, which does not occur simultaneous throughout all areas of the heat exchanger when the system is set in operation. This effect leads to local thermal stresses.
When inlet temperatures differ by more than 100 K (180 °F) SWEP recommend a temperature gradient ≤ 5 K/min (9 °F/min).
For example:
Hot gas is cooled by water. Then the gas flow rate should be ramped up so that the increase of the outlet water temperature is ≤ 5K/min (9 °F/min).
¶ This BPHE has a cross-connected configuration. Port F1/F4 are connected as well as F2/F3, please see the installation guide for more information
The B9, B30, B60, D650 and D700 have a cross-connected configuration, instead of the parallel flow normally found in BPHEs. In the B9, B30 and B60, ports F1-F4 are equivalent to the outer circuit, and ports F2-F3 to the inner circuit. For the D650 and D700, ports F5-F6 are the outer circuit and ports F1-F4 and F2-F3 are the inner circuits.
