Knowing if a HVAC system or fan is working efficiently for your customer is important and can be determined by the airflow it produces. Here are several techniques to measure airflow in an HVAC system ...

The simple system in Figure 1 shows the application of the Second Law of Thermodynamics. The compressor (A) adds energy to the refrigerant, and it becomes hot, just the way a hand operated tire pump ...

Journal of Urban and Environmental Engineering, Vol. 8, No. 1 (January to June 2014), pp. 3-10 (8 pages) Abstract: At this study an attempt for the theoretical approach of the Reynolds number effect ...