COMPRESSORS
HallScrew:
& E Hall has pioneered the development and application of refrigeration technologies for more than 130 years and the single screw compressor under the HallScrew brand has been at the heart of our compressor products for the past 40 years.
The HallScrew compressor is employed in a wide range of cooling applications around the world and we have been able to build on its outstanding reputation for quality, durability and energy efficiency with the release of our latest New Generation HallScrew compressors. They enhance the existing range of models and in doing so offer our customers unprecedented benefits in terms of minimising their carbon footprints and maximising efficiency and energy savings. The new HallScrew compressors are available in three
series: ■ HSO 4200 series - 4225 (898m3 4227 (1108m3
/h).
■ HSO 5200 series - 5228 (1273m3 ■ HSO 6200 series - 6231 (1728m3
/h), 5230 (1500m3 /h), 6233 (2100m3
The HallScrew range up to 2486m3 models with a capacity of 898-2100m3
/h). /h).
/h now includes new /h with fixed or
variable volume ratio. As with all HallScrew open drive compressors, the new models can operate on all refrigerants including ammonia and other natural options. They also have a smaller footprint which allows system designers greater flexibility.
Two of the new models have similar capacity to existing ones but there are five sizes that we did not have before, filling in capacity gaps, giving our customers more choice and increasing our ability to match their requirements. In the current range, four models are certified to be used in hazardous areas with more models to be added in the near future.
At J & E Hall we work in partnership with our customers 30 July 2019 /h), 4226 (980m3 /h),
the next generation J
J & E Hall technical manager John Shennan introduces the seven new models introduced to its HallScrew compressor range.
which allows us to understand fully their processes and, in turn, their technical needs. All of the new models have carefully introduced features and maximising efficiency has been at the forefront of our thinking. Aluminium-coated rotors now make internal clearances much closer. Efficiency is dependent on how close you can make the clearance between the rotor – turning at up to 3600rpm – to the casing which is surrounding it.
The bigger the clearance, the more inefficiency or volumetric loss you have, wasting swept volume of cubic metres per hour and losing pumping capability. Advances in machining technology since the existing models were introduced mean that we were able to do the machining of the parts to much closer tolerances as well. The new models are designed to operate in a higher- pressure environment, which helps us to specifically address the growing market for heat pumps. They are designed for 40 bar, allowing them to condense gases at a much higher temperature. For example, our existing models were designed for 28 bar which can do most of what you want for refrigeration, but when it comes to heat pumps we need more capacity.
Our work often involves ammonia systems and this high- pressure zero-ozone depleting refrigerant needs 40 bar when used in heat pumps. To allow for this, we decided to make 40 bar a standard feature in our New Generation HallScrew compressors to cater for ammonia and other high-pressure refrigerants.
To handle this high pressure, the metal that the casing is made of has to be a higher strength material. The seven new models feature nodular iron casing as standard and this allows them to deal with 40 bar design pressure. Innovation is at the heart of what we do at J & E Hall. Traditionally, all screw compressors are oil-injected but our new range does not require an oil pump. You need the oil for
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