Engineering, 11.01.2021 03:00 mckinleesmomp6qj1e
Consider a Carnot-cycle heat pump with R - 134a as the working fluid. Heat is absorbed into the R - 134a at 0 degree C, during which process it changes from a two-phase state to saturated vapor. The heat is rejected from the R - 134a at 60 degree C and ends up as saturated liquid. Find the pressure after compression, before the heat rejection process, and determine the COP for the cycle. Note that this is a refrigeration cycle run in the counterclockwise direction
Answers: 3
Engineering, 04.07.2019 18:10
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
Answers: 3
Engineering, 04.07.2019 18:10
Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.
Answers: 2
Engineering, 04.07.2019 18:20
Water vapor initially at 10 bar and 400 °c is contained within a piston-cylinder assembly. the water lost heat to the surrounding according to isochoric (iso-volumetric) process until its temperature is 150 °c. the water is then condensed isothermally to saturated liquid. for the water as a system, calculate the work in kj/kg
Answers: 2
Engineering, 04.07.2019 19:20
To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.
Answers: 1
Consider a Carnot-cycle heat pump with R - 134a as the working fluid. Heat is absorbed into the R -...
English, 01.07.2019 09:00
Mathematics, 01.07.2019 09:00
Mathematics, 01.07.2019 09:00
English, 01.07.2019 09:00
Advanced Placement (AP), 01.07.2019 09:00
Mathematics, 01.07.2019 09:00