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Steady-state modeling of condensing units with an economizer loop.

Number: pap. 2617

Author(s) : MURGHAM H., MYSZKA D., BAHEL V., et al.

Summary

This paper presents an engineering model that simulates the steady-state operation of air-cooled condensing units. Packaged, air-cooled condensing units include a compressor, condensing coil, tubing, and fans, fastened to a base or installed within an enclosure. A standard condensing unit system simulation model is assembled from conventional, physics-based component equations. Specifically, a four-section, lumped-parameter approach is used to represent the condenser, while well-established equations model compressor mass flow and power. To increase capacity and efficiency, enhanced condensing units include an economizer loop, configured in either upstream or downstream extraction schemes. The economizer loop uses an injection valve, brazed-plate heat exchanger (BPHE) and scroll compressor adapted for vapor injection. An artificial neural network is used to simulate the performance of the BPHE, as physics-based equations provided insufficient accuracy. The capacity and power results from the condensing unit model are generally within 5% when compared to experimental data.

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Pages: 10

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Details

  • Original title: Steady-state modeling of condensing units with an economizer loop.
  • Record ID : 30024689
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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