A study on automatic optimal operation of a pump for solar domestic hot water system

Performance Assessment of Tank Fluid Purging and Night Cooling as Overheating Prevention Techniques for Photovoltaic-Thermal (PV-T) Solar Water Heating Systems

“…where the primary energy factors for PV electricity (fpv), parasitic energy (fpar) and auxiliary energy (faux) were all set to 2.5 (general purpose electricity) [16]. Moreover, the backup heater (i.e., an immersed electrical heating element) efficiency to 100%, the power converter efficiency to 95% and the pump power (Ppump) defined as a cubic function of the collector array mass flow rate (mc) according to (2), where the pump power coefficient (Kp) was set to 1000 W 1 Kg -3 s 3 after [17]. Ppump = Kp*mc 3 .…”

Performance of variable flow rates for photovoltaic-thermal collectors and the determination of optimal flow rates

“…Studies on flow optimization have been performed for systems incorporating thermal storage. Nhut and Park (2013) performed an analysis of evacuated tube collectors to provide domestic hot water heating through a thermal storage tank in South Korea. They performed simulations to determine the optimal flow coefficient to control flow rate based on the outlet temperature from the collectors and the tank temperature, which provided the largest net energy balance between useful solar heat gains and pump electrical consumption.…”

Solar Water Heating

“…A project that focused on the control variables for a pump in a solar domestic water system was reported by Nhut and Park (2013). The study considered the trade-offs between useful heat gain of the system and the electrical use of the pump.…”