کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
787125 | 1466442 | 2012 | 11 صفحه PDF | دانلود رایگان |
Three groups of alternative absorption heat pumping processes (AHP) with different natural working fluids are being analyzed in this paper: Absorption heat transformer (AHT) process using partially miscible working mixtures; AHP-processes using a condensable auxiliary fluid (Einstein–Szilard cycle, Rojey cycle); NH3/H2O-AHP-process using strong bases as additives (e.g. NaOH).The thermodynamic simulations have shown that a NH3/H2O absorption cycle using a strong base as additive seems to be promising for applications using low-grade heat sources and the Rojey cycle offers higher COPs than a conventional NH3/H2O-AHP at high generator temperatures and low temperature lifts. The investigated AHT-process and the Einstein–Szilard process seem presently not to be competitive compared to conventional technologies.At present the influence of strong bases on a conventional NH3/H2O-AHP is being investigated at the Institute of Thermal Engineering, Graz University of Technology.
► We analyze different alternative absorption heat pumping processes.
► The NH3/H2O/NaOH AHP-process is promising at low generator temperatures.
► The Rojey cycle is promising at low temperature lifts.
► Tests on the NH3/H2O/NaOH AHP test rig are being carried out.
Journal: International Journal of Refrigeration - Volume 35, Issue 3, May 2012, Pages 594–604