How to Select the Type of Refrigeration Unit？

Water chiller is the cooling heart of central air conditioning system and industrial equipment. Correct selection of water chiller is not only the guarantee of successful engineering design, but also has a long-term impact on the operation of the system. Therefore, the selection of chillers is an important work.
(2) Considerations for selecting chillers:
Use of buildings.
Performance and characteristics of various types of chillers.
Local water sources (including water quantity, temperature and water quality), power sources and heat sources (including types, properties and grades of heat sources). Distribution regularity of cooling load (heat load) of air conditioning in buildings throughout the year. Initial investment and operating expenses.
Limitation period for Freon refrigerants and the possibility of using alternative refrigerants.
(2) matters needing attention in the selection of chillers:
After fully considering the above factors, the following points should be paid attention to when choosing chillers:
1. For the cooling source of large central air-conditioning system, it is advisable to choose a water chiller with compact structure, small floor area, compressor, motor, condenser, evaporator and self-control elements assembled on the same frame. Direct evaporative compression condensation unit is suitable for small air conditioning system.
2. Absorption chillers should be used in places with suitable heat sources, especially in places with waste heat or waste heat or where electricity is scarce.
3. Generally, 2-4 refrigeration units are suitable for selection, 2 for small and medium-sized units, 3 for larger units and 4 for super-large units. The possibility of standby and switching between units should be considered. In the same computer room, different types of units with different capacities can be combined to save energy. In parallel operation, at least one unit with high automation, good regulation performance and high efficiency under partial load should be selected. When choosing piston chiller, priority should be given to multi-head automatic joint control chiller.
4. When choosing power-driven chillers, centrifugal chillers should be selected when the refrigeration capacity of single air conditioner is greater than 1163 kW; centrifugal chillers or screw chillers should be selected when the refrigeration capacity of single air conditioner is between 582 and 1163 kW; piston chillers should be selected when the refrigeration capacity of single air conditioner is less than 582 kW.
5. The refrigeration coefficient COP of electric driven refrigerators is higher than that of absorption refrigerators, and the former is more than twice that of the latter. The order of energy consumption from low to high is centrifugal type, screw type, piston type and absorption type. However, each type of unit has its own characteristics, and its advantages are applied.
6. When choosing refrigerators, we should consider their pollution to the environment: firstly, noise and vibration should meet the requirements of the surrounding environment; secondly, the harmfulness of refrigerant CFCs to the atmospheric ozone layer and the size of greenhouse effect, and pay special attention to the prohibition schedule of CFCs. Absorption refrigerators have obvious advantages in preventing CFCs from polluting.
7. Modular chillers can be used in the retrofit and installation of air conditioning without special room location.
8. Choose domestic units as far as possible. The refrigeration equipment industry of our country has developed rapidly in recent ten years. The performance of most products has approached the advanced international level, especially the small and medium-sized water chillers, which are comparable to the imported products and have incomparable advantages in price. Therefore, under the same conditions, domestic chillers should be preferentially selected.