Heat transfer functionBoard piece of functionality, in water - water heat exchanger, countercurrent operation, on both sides of the hot side qualitative difference in temperature of 40 ℃, the velocity of 0.5 m/s under the condition of total heat transfer coefficient, the horizontal flat wave plate, should be greater than 2210 w/(m2. K);About herringbone corrugated plate, should be greater than 2908 w/(m2. K).The hydraulic experimentExperimental liquid in water, both sides should be one sided pressure separation experiment, the experimental pressure of 1.25 times planning.After pressure testing should be clear water, dry or dry, then the clamping.The quality of gasketA. use temperature and physical function should agree with related regulations.B. there is no bigger than 3 was appearance, depth is greater than 1.5 mm of bubbles, pits and other faults affect the sealing function.