Regarding screw refrigeration compressors

The difference between models with and without an economizer lies mainly in energy savings. In models with an economizer, part of the fluorine gas is subcooled in the economizer before entering the evaporator; the source of this energy comes from the fluorine gas in the liquid storage tank

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What aspects of screw refrigeration compressors would you like to know about?

Function of the economizer: A portion of the liquid exiting the condenser is throttled through a throttle valve to reduce its pressure, and this liquid then enters the economizer where it cools the rest of the refrigerant coming from the condenser. This increases the subcooling temperature and thereby boosts the cooling capacity of the unit.

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The main difference lies in energy savings; you can approach a manufacturer, consult their engineers, and request some samples, which come with detailed information!

Freon screw vapor compression chillers – The screw compressor was invented in 1934 by Alf Lysholm, a professor at the Royal Institute of Technology in Sweden, with the initial purpose of being used for pressurizing diesel and gas turbines. According to relevant statistics, during 3,000 hours of operation, the failures of piston-based units are 10 times those of screw-based units ； During 12,000 hours of operation, the failures of piston units were four times those of screw units. Screw compressors belong to the rotary type; their amplitude is 1/5 that of piston compressors, so vibration and noise levels are relatively low. Currently, screw compressors with injection have become the main type of equipment in the fields of aerodynamics and refrigeration and air conditioning. It holds a dominant share of the market in aerodynamic devices with moderate volumetric flow rates and refrigeration units with moderate cooling capacity. In industries such as food and pharmaceuticals, oil-free screw compressors are highly regarded as innovative, clean, and efficient process compressors. Composition and process flow of screw-type chiller units. The main equipment includes screw compressors, condensers, evaporators, dry filters, suction filters, oil separators, oil coolers, coarse oil filters, fine oil filters, oil pumps, and four-way solenoid valves. A screw compressor is a positive-displacement rotary compressor that has seen rapid development since the 1970s. It uses a male screw (male rotor) and a female screw (female rotor) that mesh with each other to form a pair of rotors that rotate inside the casing. A V-shaped sealed space is formed between the teeth of these rotors and the cylinder body; as the pair of rotors rotate in opposite directions, the volume of this space changes continuously, allowing a certain amount of gas to be periodically drawn in and compressed, thus completing the processes of intake, compression, and exhaust. Screw refrigeration compressors use oil injection for cooling; their oil circuit system is relatively complex, equipped with an oil separator and its associated components. The oil circulation process is as follows: Screw chillers are fitted with complete start-up and control cabinets, as well as various monitoring instruments. It is also equipped with automatic protection devices for conditions such as excessive exhaust pressure, insufficient suction pressure, low fuel supply pressure, excessive pressure difference across the oil filter inlet and outlet, high oil temperature, low temperature of the cold water output, and overload of the oil pump motor and compressor motor. The unit is equipped with a volume ratio control slide valve; by using this slide valve to adjust the effective compression stroke, stepless energy regulation is possible. Screw chillers have the following characteristics. 1. It has a simple and compact structure, small size, and light weight. Since the main moving parts of a screw-type refrigeration compressor are a pair of intermeshing rotors, and there is no reciprocating inertial force generated by the complex crank-slider mechanism found in piston compressors, its rotational speed is higher than that of piston compressors, resulting in a lower weight per unit of cooling capacity. 2. It operates smoothly, is safe and reliable, and is easy to use. It can operate at high compression ratios; it remains safe even at a condensation temperature of 456°C. 3. High volumetric efficiency. Due to oil injection cooling, the compressor’s exhaust temperature is low; moreover, the r model H41 has no clearance volume, resulting in high volumetric efficiency. 4. Moist vapor or a small amount of liquid refrigerant can enter the unit, with no risk of liquid slugging. 5. It has few vulnerable parts, a long operating cycle, and is easy to maintain. 6. The cooling capacity can be adjusted steplessly from 100% to 10% via a slide valve. However, screw compressors generate relatively high noise levels (usually above 80 dB), and their lubrication systems are complex and large-scale; they also consume a lot of fuel and electricity. As a result, although the rotation speed of screw compressors is higher than that of piston compressors, it is lower than that of centrifugal compressors. The capacity of single-unit refrigerators is currently below 1600 kW. Therefore, it belongs to the category of units with moderate cooling capacity. Recommended reading: Articles on lithium bromide expertise, Han Gong’s blog entries on the Hai-Chuan Forum: http://bbs.hcbbs.com/home.php?mod=space&uid=824057&do=blog&view=me&from=space