The temperature difference at the end of the copeland scroll zsi condensing unit is the basis for identifying whether the shell and tube are too dirty. Does the screw chiller have to be cleaned? After learning the calculation method of the end temperature difference, I learned the distinguishing standard of the screw chiller.
First, check the basic operating parameters of the screw chiller. After the screw chiller is turned on, check the basic operating parameters of the diesel generator, pay attention to the inlet and outlet temperatures of the chilled water, and the inlet, condensing pressure and evaporation pressure of the refrigeration circulating water.
Calculate the temperature difference at the end of the copeland scroll zsi condensing unit, and convert the condensation pressure and evaporation pressure into the corresponding condensation saturation temperature and evaporation saturation temperature. If the screw chiller touches the display, you can query the cold temperature and evaporation temperature. This value is the phase of the screw chiller. The corresponding condensation saturation temperature and evaporation saturation temperature.
If the calculated end temperature difference is greater than 5°C, it can be specifically analyzed that the heat exchanger has been fouled. When the end temperature difference is greater than 7°C, the situation is seriously fouled.
If the temperature difference at the calculation end is too large, the water quality can be checked:
1. Check the water quality of the glass fiber reinforced plastic refrigeration tower, and it is required to be clear, free of sediment, suspended solids, algae and other sediments. If the screw chiller is inspected, the water quality is turbid and the filler is scaled, and the temperature difference at the outer end is > 5 °C, which can clearly indicate that the shell and tube of the heat exchanger is scaled.
2. Frozen water quality: clean the base, collect water from the frozen water outlet transparently, and observe whether it is turbid. Shake the base to observe whether there are suspended fine particles. Stand still to observe whether there is sediment at the bottom of the base.
If the chilled water is turbid and the temperature difference at the end is >5°C, it can be confirmed that the shell side and tube side of the heat exchanger are fouled.
The above are several important links in the repair and maintenance inspection of the copeland scroll zsi condensing unit. Hope it can help you.