Pressure issues in ammonia refrigeration systems
Thread Content
As the title suggests, it’s an ammonia-based refrigeration system with separate components such as a compressor, an evaporation cooler, an ammonia tank, and an evaporator. This system is used to produce low-temperature water at temperatures ranging from 0 to 3 degrees Celsius. What is the appropriate relationship between the power of the evaporation cooler and that of the compressor? Are there any specific requirements regarding the maximum allowable pressure in this system? Can it be increased further after reaching 1.5Mpa?
Through study, I learned that in theory, the larger the area of an evaporation cooler, the better – the larger it is, the lower the condensation pressure. However, in practice this is also limited by the local wet-bulb temperature under operating conditions. Different manufacturers have formulas for selecting evaporation coolers; in my opinion, these formulas are suitable for new equipment. After the equipment has been in use for several years, its efficiency declines due to various factors, though the extent of this decline varies from manufacturer to manufacturer.
1. Check whether the filter is clogged. 2. Check whether the night supply valve is damaged. 3. Condenser water temperature, blockage, and scaling. 4. Condenser water temperature.
The maximum pressure of the system depends on its actual conditions; if it is a pressure vessel, then the system’s maximum operating pressure should be considered. If the heat exchange efficiency is poor, it may be related to inadequate maintenance (for example, has the heat exchanger been cleaned?) Is the expansion valve clogged, or is there a leak in the gas inside the temperature sensor? Or the system may have minor leaks, and over time it is necessary to locate these leaks and add refrigerant)
There are many situations that can lead to poor heat exchange efficiency; it is recommended to conduct a systematic analysis using methods such as decision trees