Have fun with the cooling water and condensate water system, start here!

Have fun with the cooling water and condensate water system, start here!

1. Design steps of cooling water system

　　 1. Installation of cooling water pump and cooling tower

　　Each cooling tower should be equipped with at least one water pump. Generally, spare pumps should be considered for maintenance. Generally, the connection between the water pump and the unit of the cooling water system of the air conditioner is press-in type (for the unit), and only when the suction section of the water pump has sufficient pressure head to prevent water vaporization. Most of the cooling towers are open and equipped with fans to force the air and cooling water to flow in order to improve the cooling effect of the air. The tower is equipped with high-density hydrophilic packing materials, and the commonly used cooling towers have two types: counter-flow type and direct-ac type. The cooling tower should be equipped with water supply pipes (with float valve), overflow pipes and sewage pipes.

　　2. Determination of pipe diameter of cooling water system

When a chiller is equipped with a cooling tower and a cooling water pump, the pipe diameter of the cooling water pipeline can be determined according to the pipe diameter of the inlet and outlet of the cooling tower; when a cooling tower supplies several chillers, each chiller The diameter of the cooling water inlet and outlet pipes of the chiller is the same as that of the condenser cooling water of the chiller. The diameter of the inlet and outlet pipes of the cooling tower is the same as that of the inlet and outlet pipes of the cooling tower.

　　 or refer to the following list to select the diameter of the cooling water pipe:

　　 Cooling water pipe quick calculation table:

3. Selection of cooling water pump

　　 (1) Determination of the flow rate of the cooling water pump

　　 The flow rate of the cooling water pump should be 1.1 times the cooling water volume of the chiller.

　　 (2) Determination of the head of the cooling water pump

　　 The head of the cooling water pump can be calculated as follows:

　　H=1.1*(P1+Z+P3)

　　In the formula: P1------the water pressure drop of the chiller condenser, mH2O, can be found from the product samples;

　　Z------The height of the open section of the cooling tower Z (or the net height of the cooling

water lift), mH2O;

　　P2------The sum of the loss along the pipeline and the local loss of the pipe fittings, mH2O.

　　 When making an estimate, the local loss of pipe fittings in the pipeline can be 5mH2O; the loss along the way can be about 6mH2O per 100 meters of pipe length. If the length of the supply and return pipes of the cooling water system is L (m), the estimated head of the cooling water pump is:

　　H=P1+Z+5+L*0.06mH2O The symbols in the formula have the same meaning as above.

　　4. The choice of cooling tower

　　 First, determine the structure of the cooling tower according to the height of the installation location of the cooling tower and the noise requirements of the surrounding environment.

　　The amount of cooling water in the cooling tower is determined based on the amount of cooling water required by the refrigerator and the wet bulb temperature of the outdoor air.

　　 When the design conditions are different from the conditions of the product performance table provided by the cooling tower manufacturer, corrections should be made according to the thermal performance curve or data of the cooling tower given by the product sample.

After the model specifications are determined, check whether the selected cooling tower's structural size is suitable for the site installation conditions, and calculate the operating weight of the cooling tower according to the operating weight of the cooling tower, and calculate the bearing capacity of the floor or roof structure at the installation location of the cooling tower. Ensure safety.

　　 2. Design steps of condensate piping system

During the operation of various air-conditioning equipment (generally terminal equipment), the surface temperature of the surface cooler is usually lower than the dew point temperature of the air, so the surface will condense and the condensate generated must be drained away in time .

　　 1. Condensate pipe design and layout requirements

　　 (1) The condensate pipe should be polyvinyl chloride plastic pipe or galvanized steel pipe. When using polyvinyl chloride plastic pipes, the insulation layer is generally available; when using galvanized steel pipes, insulation is required.

　　 (2) When there is a sewer pipe or trench near the air conditioner, the air conditioner is equipped with a water pipe to discharge the condensate water into the sewer pipe or trench nearby.

　　 (3) When the air conditioner cannot be discharged nearby, it is necessary to use a condensate pipe to drain the condensate pipe of the air conditioner to the sewer pipe or trench.

　　 (4) The slope of the discharge branch pipe of the fan coil condensate pan should not be less than 0.01. Other horizontal branch pipes should maintain a slope of no less than 0.008 along the horizontal direction, and no water accumulation is allowed.

　　 2. Determination of the diameter of the condensate pipe

　　 The pipe diameter of the condensate branch pipe directly connected to the water pan of the air conditioner should be the same as the pipe diameter of the water pan, which can be found from the product catalog.

　　 When a condensate pipe is required, the diameter of the water pipe should be calculated based on the flow of condensed water.

　　 Under normal circumstances, about 0.4~0.8 kg of condensate water is generated per hour of 1KW cooling load.

　　 usually can be selected according to the total cooling capacity Q (KW) of the air conditioner connected to the section:

　　 Condensate pipe diameter selection