Engineering, 19.03.2020 20:14 NostalgicErasXy
Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.2 MPa and 200 kPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where the pressure in the upper and lower cycles are 0.4 and 0.5 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet, and the isentropic efficiency of the compressor is 80 percent. If the mass flow rate of the refrigerant through the lower cycle is 0.15 kg/s, determine (a) the mass flow rate of the refrigerant through the upper cycle, (b) the rate of heat removal from the refrigerated space, and (c) the COP of this refrigerator.
Answers: 2
Engineering, 03.07.2019 14:10
The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite
Answers: 3
Engineering, 04.07.2019 18:10
Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?
Answers: 3
Engineering, 04.07.2019 18:10
Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.
Answers: 3
Engineering, 04.07.2019 18:20
Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above
Answers: 1
Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.2 MPa a...
Mathematics, 20.12.2020 17:40
Physics, 20.12.2020 17:40
Arts, 20.12.2020 17:40
Chemistry, 20.12.2020 17:40
English, 20.12.2020 17:40
Mathematics, 20.12.2020 17:40
Computers and Technology, 20.12.2020 17:40
Computers and Technology, 20.12.2020 17:40
Health, 20.12.2020 17:40
Mathematics, 20.12.2020 17:40
Social Studies, 20.12.2020 17:40
Mathematics, 20.12.2020 17:40
Mathematics, 20.12.2020 17:40
Biology, 20.12.2020 17:40
Arts, 20.12.2020 17:40