You are discussing solar PV installation options with a homeowner who is considering a grid-tied system for their suburban home, and an off-grid system for their vacation home. Thinking about the PV system components you outlined for a grid-tied system in the project quiz, describe how the components differ for an off-grid installation. What components from the grid-tied system would not be needed in an off-grid situation? What other components would be added on?

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?

Wiy doeres rere okhn a pump whon working betwon the same pressure range?

To design a steam turbine to produce 12,000 hp power. a engineer comsiders using a steady state stean low st 1160fr and engineer considers using a steady state steam flow at 1160°r and 450 psia to drive this steam turbine. the exhaust of the steam is cooled by the lake (vacuum). heat losing to the surroundings is measured at a rate of 555.55 btu/s. (a) sketch the system with the given conditions. (b) neglecting kinetic and potential energy changes from inlet to exit, determine the volumetric flow rate of the steam at the inlet, (ft'/hr). must clearly show unit conversions at crtical terms.