Why are low-temperature medium pipelines required to have as short sections as possible and as few elbows as possible?
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RT, it shouldn’t be about considering the pressure difference
My understanding: For energy consumption reasons, the subcooling of the refrigerant does not need to be very large. When the tube resistance loss is high, the dielectric approaches a saturated state, which is unfavorable.
It mainly depends on whether the operating pressure is close to the saturation pressure at that temperature. For example, in the case of natural flow of steam condensate, if flash evaporation is to be avoided during liquid phase transfer, it is necessary to keep the pressure drop as low as possible.
The pressure ratio Pv of refrigerants is not much higher (except when pumped), whereas the Pv value of media at normal/high temperatures is much higher; they can withstand pressure drops in the pipelines without entering a two-phase state. When it vaporizes during refrigerant transmission, it is no longer a refrigerant.