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Advances in hybrid compression technology for ultra-low temperature refrigeration achievement.

Number: pap. 001

Author(s) : STAICOVICI M. D.

Summary

The Hybrid Compression (HC) technology, a synergy between an Absorption Technology Section (ATS) and a Mechanical Vapor Compression Technology Section (MVCTS), was successfully proposed recently for refrigeration and heating, Staicovici (2015a, b, c). In this work, HC advances in the ultra-low temperature refrigeration (ULTR), with emphasis in freeze drying applications, are disclosed. Two types thereof are in research. Both have the same ATS, but different MVCTS’s: a) 2 to 4 stage with discharge gas superheating recovery (TWRC, (Staicovici, 2014)) (HC1), and b) improved HC1 model (HC2). HC1 and HC2 are compared to a standard, 2 to 4 stage and interstage cooling, MVC unit. The MVC, HC1 and HC2 model considers NH3-H2O and NH3, seven evaporator temperatures, TE = -75, -70, ..., -45 oC, three sink source temperatures, Tss = 27, 36, and 45 oC, and four HC technology most relevant parameters: i) MVCTS maximum discharge gas temperature, TCpO; ii) refrigeration coefficient of performance (COP); iii) MVC vs. HC comparative compressed refrigerant volume, RV, and iv) exergy efficiency, ? E. Results show outstanding comparative HC vs. MVC and absolute values of i)-iv) parameters, for same Tss and TE: A) HC1 and HC2 are compatible with today compressor operation, because TCpO are smaller by 50 to 170 oC than those of MVC; B) HC COP’s are much higher than those of MVC, especially in the TE= -75 to -60 oC domain, e.g. by 43 to 65 %; C) HC reduces RV by 2.5 to 8 times as compared to MVC, promoting compressor physical size reduction; D) HC ? E has very high values, 0.62 = ? E = 0.78; E) T=he HC2 COP, RV and ? E values are better than those of HC1.

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Details

  • Original title: Advances in hybrid compression technology for ultra-low temperature refrigeration achievement.
  • Record ID : 30019490
  • Languages: English
  • Subject: Technology
  • Source: 2nd IIR Workshop on cold applications in life sciences.
  • Publication date: 2016/09/08
  • DOI: http://dx.doi.org/10.18462/iir.cals.2016.0001

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