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Cold storage and refrigeration system building automation and control approach


Lessons learned and problems 4-1, the need for reliable control tools and monitoring methods. Majesty ammonia refrigeration system require a higher security, automation and control of its control than for other industrial complex, so I chose a reliable, advanced control equipment and control is very important. PL ~ is a mature industrial controller, to replace the traditional control model of effective tools; surface based on PLC, SCADA (SupervimryContldAndDataAequisitim) system, a 37 - \Supervisory Control and Data Acquisition System, provides us with a reliable, flexible monitoring methods. Programming is a delicate and difficult and important work. Requires close coordination with the technology staff to the device for the controlled object as a whole, considering the operation of the association between various parameters and influence to ensure that in any conditions, it is a realistic,[link widoczny dla zalogowanych], safe and energy saving Best operating procedures. 4-2, the controllability of automatic system control components, reliability is the key to the safe operation of the system automatically. Danfbss the company's valve quality, reliable, and have good technical support and after-sales service, using the company's products, is the ideal choice; but the higher capital investment. On the contrary, there are other manufacturers to install the product, such as Siemens Water solenoid valve, solenoid valve made of water and water relays have some problems, and some can not even use. 4-3, the use of automatic control, requires that the system must be very clean. To this end, we all made the pipe pickling, passivation. Even so, there are also impurities, as well as a PI ~-L valve apart and wash six, seven, is still closed lax, seals may be damaged,[link widoczny dla zalogowanych], for further examination. Danfoss valve wearing parts (such as the coil) to have spare parts, because the import procedure is very cumbersome and takes a long time, and a small quantity, firms are unwilling to accept, so this must be well prepared. 4-4, automation design and installation to select the strength, experience, turnkey contractors, and asked them to have good a good after-sales service for technical support. Even better cabinet construction and the production by the company responsible for laying the cable to reduce the wrangling between the construction unit. We have a pump cabinet, as is another semi-automatic unit designed and manufactured according to the original, and the master control cabinet and the network had difficulties. 4-5, refrigeration system, automatic operation easier, the automatic freezing of the system is relatively cumbersome and difficult. Ask, do not often use because of freezing, the pressure of the system usually higher, and produced by manufacturers 'match low-level' with a small motor, requires Te ≤ a 25 ℃ (0.5bar) to run only when fully loaded, you need to use high-pressure machine for single-stage pull cryogenic system, and then, and then converted to two-stage pull in the cold. Doing so may soon be pulled in the cold pressure of 0.5bar, the pressure is so low in the cold, low-voltage loop barrels more difficult for the liquid. Therefore, the use of a 35 ℃,[link widoczny dla zalogowanych], the need for manual intervention, before the pressure of the system down. The system is not used, to be proven, and then corrected according to the situation. We can only units in the targeted group to play with between the two-stage, between units can engage in any \38 can be a PIE interface due to a lack of energy can only be done 'manually' put upon, the point with the mouse. 4-6, automation and electricity averting a conflict. Automated procedures require the storage temperature for the command start and stop equipment, while the unit most of the time required low power consumption. Of course, human intervention can be done off-peak operation, but fully automated to some extent meaningless. 4-7, the original design of the compressor single exhaust is too large, so that the displacement ratio of the level of press different economic rationality. Generally,[link widoczny dla zalogowanych], in the Te ≥ -40 ℃, the high and low level of displacement of the appropriate ratio of 1:3, and we can only be assigned to 1:2. If more than several LG16 units installed, can make the mixture more flexible. 4-8, defrost operation although you can select the 'automatic' manner, but there are some hot ammonia defrosting and prevent the danger of frost when the pipe water will overflow and other issues,[link widoczny dla zalogowanych], the general or to manually defrost appropriate. 4-9, have a certain theoretical basis and practical experience of electrical engineers and electricians for maintenance services in order to achieve effective support. 5, the refrigeration system control program 5 to l, cold storage refrigeration system block diagram with the following computer-controlled 5-2, the refrigeration system automation and control process :5-2-1: The system automatically control program: <refrigeration technology) 2o06 years June 2 (total 115) 5-2-2: compressor from control theory: a 39 -

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