AIKON-文章详情

Our laboratory's pipeline circulation test bench is composed of a closed system consisting of a water pump, a water tank, and pipelines. The water pump outputs water, flows back to the water tank, and is then pumped out again. The water pipes on the test bench, even without direct contact with a heat source, have a water temperature higher than room temperature, presenting a "warm" state. This is because no mechanical equipment can achieve 100% energy conversion efficiency during operation, including motors and water pumps. As a power source, an electric motor converts electrical energy into mechanical energy through the principle of electromagnetic induction, and with energy loss, it mainly emits heat. These heat are mainly dissipated to the surrounding environment through the motor housing, while the heat transferred to the connected water pump and water is relatively small and can usually be ignored.
In contrast, during operation, the energy loss of a water pump is almost invariably converted into heat. This part of the heat is directly transferred to the water flowing through the pump, causing the water temperature to rise. Therefore, even the seemingly "cold" metal pump body is actually one of the "culprits" for the abnormal water temperature in the test bench water pipes.
In addition to the motor and water pump, the transmission process of water flow in the pipeline system also generates additional heat. Specifically, the friction between the water flow and the pipe wall, as well as the relative motion between particles inside the water flow (internal friction), can cause energy to dissipate in the form of heat. This phenomenon is referred to as "loss along the path" or "frictional loss" in fluid mechanics. At the same time, the energy loss caused by rapid changes in flow direction or velocity, namely local loss, can also lead to the conversion of kinetic energy of water flow into internal energy. Although each small heat generation may be insignificant, when this heat accumulates continuously in a closed pipeline system and cannot be effectively dissipated in a timely manner, it is enough to cause a significant increase in overall water temperature.
In summary, the efficiency losses of the motor and water pump, as well as the frictional losses along the pipeline, work together to gradually increase the water temperature inside the water pipe of the test bench. Especially when the system runs continuously, due to limited heat dissipation conditions, heat accumulates continuously and is difficult to dissipate quickly, leading to further increase in water temperature. In this case, even if the external environment temperature is not high, the water in the test bench water pipe may still feel warm, and in some cases even reach a high temperature.
The reason why the temperature of the test bench water pipe often shows a warm state is mainly due to the incomplete energy conversion of the motor and water pump, which leads to heat generation, as well as the loss of water flow along the way and locally during pipeline transmission, ultimately resulting in an abnormal increase in water temperature.