The design and selection of the water-water plate heat exchanger is the same as most heat exchangers. It is necessary to know the inlet and outlet temperature and flow rate of the primary measurement, and the inlet and outlet temperature and flow rate of the secondary side. If you don't know the flow rate, you must also inform the total heat exchange of the working condition under the premise of knowing the temperature before you can make a selection. So how do we determine the selection of water-water plate heat exchangers?
(1) Pressure drop check of plate heat exchanger
The design and selection of plate heat exchangers have certain requirements for pressure drop, so it should be checked. If the pressure drop exceeds the allowable pressure drop, the design selection calculation needs to be re-calculated until the process requirements are met.
(2) Selection of plate model of heat exchanger
The plate type or corrugated type should be determined according to the actual needs of the heat exchange occasion. If the flow rate is large and the pressure drop is small, the plate type with low resistance should be selected, and vice versa. According to the fluid pressure and temperature, the detachable type or the brazed type is determined. When determining the type of heat exchanger plate, it is not appropriate to choose a plate with a single plate area that is too small. This will result in too many plates, low flow velocity between plates, and low heat transfer coefficient.
(3) Process design of heat exchanger
The process of the heat exchanger refers to a set of parallel flow passages in the same flow direction of a medium in the plate heat exchanger. The flow channel refers to the medium flow channel formed by two adjacent plates in the plate heat exchanger. Under normal circumstances, several flow channels are connected in parallel or in series to form different combinations of cold and hot medium channels. The combination of heat exchanger process should be calculated based on heat exchange and fluid resistance, and determined under the requirements of process conditions.