ShareInvestigation on the effective use of glide and a suction-line liquid-line heat exchanger to improve performance in air conditioning and heat pump.
Number: 2262
Author(s) : KIMURA DE CARVALHO B. Y., SETHI A., RACHED W.
Summary
The escalating demand for low-GWP, high-efficiency refrigerants in air conditioning and heat pump applications has driven the adoption of blends capable of meeting technical and performance criteria. Zeotropic compositions, characterized by temperature glide, may necessitate heat exchanger redesign to counter pinching effects. However, this unique property presents an opportunity for performance enhancement. Leveraging the refrigerant glide, particularly in areas where a constant saturation temperature cannot suffice, offers a promising avenue for improvement.
This investigation explores the use of multi-row coils to align the glide with the temperature lift of the air and introduces the use of a suction-line liquid-line heat exchanger (SLHX) to exploit the glide to improve evaporator performance. Thermodynamic properties of HFO-based refrigerants show a need to increase overall heat transfer area and compressor displacement to match COP and capacity of R410A. By designing heat exchangers around a cross-counter flow arrangement and proper circuitry it’s possible to achieve similar performance to R32. Through modeling, the study assesses the impact of SLHX on pure (R32) and zeotropic (R454C) refrigerants. The results demonstrate significant performance enhancement for R454C, attributed to the relocation of the higher temperature saturation region from the evaporator to the SLHX. This enables operation at higher suction pressures without encountering evaporator pinching. The findings underscore the potential of SLHX in optimizing refrigerant performance, particularly in zeotropic compositions, for enhanced efficiency in air conditioning and heat pump systems.
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- Original title: Investigation on the effective use of glide and a suction-line liquid-line heat exchanger to improve performance in air conditioning and heat pump.
- Record ID : 30033099
- Languages: English
- Subject: Technology
- Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
- Publication date: 2024/07/17
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Indexing
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Themes:
Thermodynamics, transfer processes: general information;
Compression systems - Keywords: Refrigerant; Heat exchanger; Zeotropic mixture; Glide; COP; R410A; R32; HFO; Modelling
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