|Title:||Optimal Sizing of Two-Phase Heat Exchangers
|Author(s):||Dobson, M.K.; Wattelet, J.P.; Chato, J.C.
|Subject(s):||refrigerant-side evaporation condensation studies
|Publisher:||Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
|Citation Info:||Correlations for two-phase heat transfer and pressure drop developed by ACRC
Project 01 are presented and discussed. In particular, these correlations are used to assess
the impact of the tube diameter on the required length of heat exchanger to perfonn
phase-change processes. The correlations are integrated into a spreadsheet for
evaporation and condensation that predicts the required length of two-phase heat
exchanger when supplied with the operating conditions. The spreadsheets and macro
sheets which provide needed thennodynamic and transport properties are included with
the report. The spreadsheets were used to study the impact of tube diameter on the
required length of condenser and evaporator tube to transfer a flXed amount of heat as
mass flow rate and air side resistance were held constant. The results revealed that over a
wide range of diameters, the required length was relatively insensitive to the tube
diameter. In this region, the required length increased slightly as the diameter was
decreased. As the diameter became sufficiently small, pressure drop destroyed much of
the driving temperature difference. At diameters below this, the required length of heat
exchanger increased greatly with further decreases in diameter.
|Series/Report:||Air Conditioning and Refrigeration Center TR-42
|Sponsor:||Air Conditioning and Refrigeration Center Project 01
|Date Available in IDEALS:||2009-03-13