Shell and tube heat exchanger is a traditional and widely used heat exchange equipment. It has strong adaptability because of its strong structure and can be made of various materials. Shell and tube heat exchanger is widely used in various industries. It is often used as the oil cooler of equipment thin oil station and vehicle engine oil cooler in cement production enterprises.

There are three commonly used temperature units (temperature scale): Celsius temperature, Fahrenheit temperature and absolute temperature. Celsius temperature (T, ℃): the temperature we often use. The temperature measured with a centigrade thermometer. Fahrenheit temperature (F, ° f): the temperature commonly used in European and American countries.

Cooling tower is a kind of equipment for heat exchange between water and air, which is mainly composed of fan, motor, packing, water sowing system, tower body, water pan, etc., while heat exchange mainly consists of heat exchange between low-temperature air and water in packing under the action of fan to reduce water temperature. The structure and design conditions of the water tower are indicated in the specification, and the unit of water ton we use now is the unit commonly used in the world. It is convenient in calculation and selection, and about 20% margin should be reserved in selection of cooling tower.