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The rated flow rate for both pumps is 120 kg/hr (264. Investigating the performance of two types of solar domestic water heating (SDWH) systems with drain water heat recovery through computer simulation and experimental analysis
The most efficient of these is pump speed con-. trol. When a pumpâs speed is reduced, less energy is imparted to the fluid and less. energy needs to be throttled or bypassed. Speed can be controlled in a number of. ways, with the most popular type of variable speed drive (VSD) being the variable. frequency drive (VFD). Pump speed adjustment is not appropriate for all pumping systems, however.