Then θ is a complete congruence relation iff θ is a chain transitive congruence relation;(2) If θ is a chain transitive relation,then θ is a complete congruence relation iff θ satisfies the substitution property.

Based on sustainable development,CO_2 emerges as one of the most likely alternatives to the synthetic fluids in heat pump water heaters.

This paper discusses a simple method which is able to provide the COP and the capacity of a theoretical refrigerating cycle using alternatives as working fluids, by means of some new relative factors such as the reduced difference of the cycle temperature, the reduced suction temperature and subcooling temperature.

Experimental study on performance of air source heat pumps with alternative refrigerants;

In this paper, experimental studies are carried out on the suitability of alternative refrigerants of R32/R134a and R407C with polyester type lubricants of different models.

The refrigerator performance tests have been carried out using refrigerant CFC12 and its alternative refrigerant HFC152a/HCFC22.

Based on the steady state distributed parameters model of the condensers which was put forward in the previous related reference the heat transfer and flow characteristics of four different two-rows condensers which used the refrigerant replacement(R407C,R410A,R134A)of R22 were studied.