Duplex oil-water cooler is a heat exchanger composed of two shell-and-tube coolers with the same structure connected in parallel through a switching valve group, which is mainly used for cooling lubricating oil, hydraulic oil and other viscous media, taking away the heat through circulating water (or other cooling media) to maintain the temperature stability of the oil system. Its core advantage lies in the on-line switching of a single cooler, realizing “one use, one standby” or “simultaneous operation” mode to enhance system reliability.
Heat exchanging process
Hot oil (55-80℃) → inlet main pipe → switching valve distributes to single cooler shell process
↓
Cooling water (32-37℃) → pipe process (2-4 pipe process counter flow)
↓
Cooled oil (40-50℃) → outlet main pipe → oil system
Three modes of operation
Single unit operation
One cooling, the other standby
Normal load conditions, standby cooler regular maintenance
Parallel operation
Two units are put into operation at the same time, the heat exchange area is doubled
High load conditions (such as high oil temperature in summer), or when the efficiency of single unit heat exchange is reduced
Online switching
Switching coolers in operation (old → new)
Single unit scaling needs cleaning, or equipment failure needs isolation
Application industries
Power industry
Metallurgy industry
Ship power
