COMPRESSORS
and maintaining multiple traditional compressor units, it can be argued that using these same sums to finance hardware prototypes is even more inadvisable. This is especially the case when considering that compared to existing compressor unit technologies, there is less performance data available for new models using lower-GWP refrigerants. Performance metrics such as torque, flow rates and volumetric efficiency are therefore harder to measure and predict, and can only be accurately gauged once models are built. Yet with no guarantee of success, the possibility of wasted expense could be unconscionable for some manufacturers. Similarly, REMs interested in new technologies but unable to commit to the design, manufacturing and testing burden associated with full long-term projects may require a proof-of-concept study ahead of this step. However, with innovation a must in order
to overcome the issue of existing compressor technologies using greener refrigerants, this challenge will need to be addressed. Not doing so could lead to an unenviable situation for REMs, in which they may become more reliant on less efficient compressor technologies and the waning performance levels that could ensue.
The ‘middle step’
This is not to say that building hardware prototypes will become outmoded, as it is a vital and necessary part of the design process for refrigeration solutions. What is instead required is a ‘middle step’ between the concept and the model-building stage, in which performance can be more accurately predicted and analysed. In this, innovative rotor modelling software may provide a solution.
A combination of historic data, experience and customer specifications around outlet pressure, shaft power and flow rates are used to inform both virtual and physical prototypes. Yet where effective rotor modelling software can provide the difference is in the ability to input process parameters alongside required geometric requirements. Importantly, this bolsters existing design
processes and as such, the software allows design engineers to make informed choices ahead of manufacturing and testing hardware, with greater knowledge of performance variables including different speeds, outlet pressures, refrigerant and coolant flow rate.
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Swift modelling Significantly, these methods can more quickly create multiple models, as manual measurements for manufactured prototypes are unnecessary. At Vert, this has allowed swift analysis of multiple compressor sizes to gauge thermodynamic performance ahead of production. Alongside this, the ability to extrapolate performance in this way can allow design engineers to more effectively anticipate maintenance requirements for models ahead of when they are built. When exploring new and innovative refrigeration technologies where less historic data is
available, such a consideration may be vital. In conclusion, the compressor may offer REMs an effective route to navigate constantly tightening sustainability legislation. However, the ability to do so hinges on having the capacity to quickly model and test prototype unit designs that can achieve the compression levels required for low-GWP refrigerants. By engaging with forward-thinking
organisations capable of this approach, companies can put themselves in the best possible position to adapt to this industry megatrend.
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