How do (In room) hotel smoke alarms work and differ from home units? And does it differ between age and types of motels such as Best Western vs an off brand in your town for only 80$ a night? Also who keeps maintaining them? Is it possible for a guest to PUT IN a Lithium battery if they discover one missing (either at their own expense or perhaps take it off the room bill later) after notifying the front desk they made the non working alarm now suddenly working and prove it to them?

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater