A Scroll Economiser Cycle for use in Multi-temperature Indirect Transport Refrigeration Systems. Shane Smyth, Donal P. Finn, Barry Brophy and David J. Timoney School of Electrical, Electronic and Mechanical Engineering University College Dublin, Ireland
19
Embed
A Scroll Economiser Cycle for use in Multi-temperature ... SIRAC...A Scroll Economiser Cycle for use in Multi-temperature Indirect Transport Refrigeration Systems. Shane Smyth, Donal
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
A Scroll Economiser Cycle for use in Multi-temperature Indirect Transport
Refrigeration Systems.
Shane Smyth, Donal P. Finn, Barry Brophy and David J. Timoney
School of Electrical, Electronic and Mechanical Engineering
University College Dublin, Ireland
Presentation Outline
1. Context
2. Objective and Approach
3. Experimental Test Facility
4. Experimental Programme and Test Matrix
5. Results – Influence of Injection Ratio on Economiser Pressure
6. Algorithm Development and Evaluation
7. Algorithm Evaluation Results
8. Conclusions
Context
Direct Expansion System Economised Indirect System
Compressor/ Condenser Unit
Primary Circuit Multiple Pumps
Economiser Cycle
Approach
Objective
• The capacity and COP of an economised multi-temperature indirect can be maximised by control of the economiser injection ratio.
• This method of control necessitates mass-flow instrumentation
which is impracticable for field applications.
• An alternative method of control is described based on the more
easily-measured economiser pressure as the primary control
parameter, thereby eliminating the requirement of mass-flow
instrumentation.
Approach
• Experimental Test Rig and ATP Test Matrix
• Influence of Injection Ratio on Economiser Pressure
• Identification of Key Trends and Development of Control Algorithm
Optimum Injection Pressures Exist for control and maximisation of:
Cooling CapacityCOPCompressor Power
Optimum injection pressures are dependent on setpoint conditions.
Two Optima exist for optimisation of COP
Optimisation under high capacity conditions
Optimisation under low compressor power conditions.
Pressure Control Algorithm provides comparable performance to INJR controlled system.
Pressure control algorithm can be used to maximise either capacity or COP, depending on the requirements
This control algorithm can be used as part of an economiser cycle to compensate for parasitic losses associated with increased pressure lift on indirect systems.
A Scroll Economiser Cycle for use in Multi-temperature Indirect Transport
Refrigeration Systems.
Shane Smyth, Donal P. Finn, Barry Brophy and David J. Timoney
School of Electrical, Electronic and Mechanical Engineering