The key technical parameters of fan coil unit selection include the amount of cold water and hot water, and there is a plan for water flow when planning fan coil units. Many people do not understand what water flow will have on the cooling of fan coil units. In fact, the factors that can affect the cooling of the fan coil are not only the air volume and the air inlet parameters, but also the water flow is a very important item.
When the cold water temperature is set at 7°C, the system operation is controlled by the freezer. At this moment, for the adjustment of the constant water flow, when the load becomes smaller, the cold water temperature will increase, and the cooling capacity of the fan coil unit will become smaller.
The standard JB/T4283-91 stipulates that the flow rate when the temperature difference between the inlet and outlet is 5°C is the additional flow rate. If the water flow rate increases, the temperature difference between the inlet and outlet water will decrease, the average temperature difference between the water and the air will increase, and the water flow rate will be increased. The increase of the water flow speed will increase, the heat release system on the water side will be increased, that is, the heat transfer system will be increased. After the heat transfer system and the average temperature difference are increased, the cooling capacity will also increase. , it can be seen that the water flow has a great influence on the cooling capacity of the fan coil. In fact, adjusting the water flow of the fan coil is to adjust the cooling capacity of the fan coil. Normally, the water flow of the fan coil is planned to reach If the specifications are met, the cooling capacity of the fan coil unit will also meet the specifications.
Fan coil units have different requirements for water flow in different seasons. How to adjust the water flow of fan coil units: In winter, the processing process of fan coil units is wet heating, so the commonly used water flow calculation method is It is the temperature difference calculation method, and in summer, the enthalpy difference method can be directly used for calculation.
How to judge whether the water flow of the fan coil is sufficient? It is judged according to the temperature difference between the inlet and outlet water of the fan coil. Under the condition that the circulating air volume of the fan coil unit remains unchanged and the ambient temperature of the indoor unit changes slowly, if the temperature difference between the inlet and outlet water of the fan coil unit is too large, it means that the water flow of the fan coil unit is insufficient and needs to be adjusted.
For more information, please contact: Chilled Water Coils.