The compression/absorption cycle - influence of some major parameters on COP and a comparison with the compression cycle

摘要: Abstract This article concerns two main studies: a parameter study and comparison. In the study, CAHP is focused upon. Its COP sensitivity to changes in absorber desorber falling-film tube length, heat exchanger area distribution, concentration change of solution studied. The relative distribution between found have little impact on COP. distributed large when examined separately, but they are studied together, with optimized for each total low. It shown that tubes should be designed as long possible order increase comparison involves new procedure comparing performance (COP) compression/absorption pump (CAHP) compression (CHP). local transfer coefficients pressure drop taken into account. Further, performed various heating applications specified investment level. typically industrial or district cases chosen three different kinds: size sink source temperature (glide), lift given glide level glide. Ammonia/water used working fluid isobutane CHP. A relevant design assumed CHP (including an indirect economizer coupling, suction gas exchanger, sub-cooler surface enhancements evaporator condenser), which not case previous comparisons this type. modeled vertical tube-and-shell exchangers. results are: (1) good glides 10 K; (2) increased 20 K, has 12% better than CHP; (3) give relatively worse Some COP-increasing parameters further proposed CAHP.