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3.2. Energy Savings with Addition of Work Recovery Device A couple of studies have been conducted by researchers to compare the use of an expansion work recovery device in comparison to an expansion valve. Robinson & Groll (1998) in their study, derived that the expansion valve is the component with the largest percentage of total irreversibility. The study concludes that replacing the valve with an expansion work recovery turbine with an isentropic efficiency of 60% reduces the process’s contribution to total cycle irreversibility by 35%. There is a notable increase in the Coefficient of Performance (COP) of the system as well. The model discussed in Chapter 2 is used to compare the primary energy savings of the system with an expansion valve and a work recovery turbine with an isentropic efficiency of 70% . The results are shown in the Figure 3-3. The light green bar in Figure 3-3 shows the primary energy savings in percentage of the system with an expansion valve over an entire year and the dark green bar shows the primary energy savings of the system with an expander. The annual primary energy savings of the system increases to ~28% from ~19% in the case of an expansion valve. This is a significant improvement of ~40%. The results show that a work recovery expansion device will lead to more significant primary energy savings. 28PDF Image | CO2 HEAT PUMPS FOR COMMERCIAL BUILDING APPLICATIONS
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