Plate heat exchangers (PHE) are a new type of efficient heat exchanger. Plate heat exchangers were originally used in the food industry and expanded to paper, pharmaceutical, metallurgy, mining, machinery manufacturing, power, marine, heating and petrochemicals. Principles and methods for designing plate heat exchangers.
(1) Selection of single-plate area of plate heat exchanger
The general choice of plate heat exchanger is first to determine the diameter of the corner hole by flow rate. The flow rate at the corner hole is generally controlled at 6 m/s. When the corner hole of the plate is determined, the series of the plate can be determined.Different manufacturers have different plate types when the corner holes are directly fixed. There are some companies that have 7 types of plates directly under the 100mm angle hole. There are 3 sizes in the area and 2 types of runner width.From the cost ratio of the single piece area, the bigger the cheaper, but the price of the whole machine has to consider the price of the frame, so it should be considered comprehensively. The single piece has a small area and the frame price is low, but the unit price is high. And the single piece area is too large, occupying a large area, and it is generally difficult to achieve a single process plate arrangement.
(1) The selection of the flow velocity between the plates is generally 0.2 m/s, which is the lower limit, but the upper limit is 0.8 m/s. But this depends on the manufacturer's slab ripples.
(3) The process of the plate heat exchanger is determined. The plate heat exchanger process is generally arranged in a single process in the industry, so that it is not necessary to take over the pipe during maintenance. Multi-process plate heat exchangers are used in the sanitary and food industries.
(4) Selection of flow direction The general plate heat exchangers are arranged in pure countercurrent flow.