Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Refrigerant 134-a enters the coil of the condenser of a residential heat pump at 500kPa and 400C and leaves at the same pressure as a saturated liquid at a rate of 0.05kg/s. Determine the power of a compressor required to run the heat pump if heat absorption from the outside air is 200kJ/kg.
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- Refrigerant 134 A enters in a condenser of a heat pump at 180 kPa and -4 0C and exits with a quality of 0.8 and the same pressure of 180 kPa. The mass flow rate of the refrigerant is 65 kg/h, and the heat pump compressor consumes 45 kJ/min of power. Determine the coefficient of performance of the heat pump. Type your answer in the first box.arrow_forward4. Steam enters the condenser of a steam power plant at 20000 kPa and a quality of 95 percent with a mass flow rate of 20 Mg/h. It is to be cooled by water from a nearby river in circulating the water through the tubes within the condenser. To prevent thermal pollution, the river water is not allowed to experience a temperature rise above 10°C. If the steam is to leave the condenser as saturated liquid at 20000 Pa, determine the mass flow rate of the cooling water required.arrow_forwardA car wash service uses 150 litre of pressurized (3 bar) warm water (45oC) to wash each car. It takes 10 min to wash each car. The service has 10 washing lanes, and it is open from (14:00 to 21:00) every day and 360 day per year. Each day 400 cars are washed. Fresh water at 1 bar pressure and 15oC is pressurized in a pump and then heated to desired temperature. Assume pump operates adiabatically and its efficiency is 85%, which is defined as the ideal power input divided by the actual power input. The ideal power input is the product of the volumetric flow rate times the pressure drop across the pump. All the other equipment of the car wash uses 5 kW of power during operation. Current (first alternative) is to buy electricity from the utility and use a natural gas fired boiler to heat the water. Assume natural gas furnace used in heating has 90% overall efficiency defined as heating provided water to heating released from fuel. The heating value of the natural gas (CH4) is 55.5 MJ/kg,…arrow_forward
- Problem 4 A 0.15-m rigid tank initially contains R-134a as saturated vapor R-134a at 0.6 MPa. The tank is connected by a valve to a supply line that carries R-134a at 1 MPa and 26°C. The valve is now opened, allowing the refrigerant to enter the tank, and is closed when it is observed that the tank contains only saturated liquid at 0.8 MPa. Neglecting kinetic and potential energy changes, determine, 1 MPa 26°C R-134a 0.15 m a) The mass of the refrigerant that entered the tank, in kg b) The amount of heat transfer to or from the surroundings in kJarrow_forwardThe vapour compression cycle below (Figure Q4) utilises the refrigerant R134a flowing at 0.05 kg s¹. Assuming that the compression is adiabatic and reversible. If the actual input power to the compressor is 2 kW, determine the following: a. The theoretical input power to the compressor and the heat transfer (4) to the evaporator. Take the enthalpies h₁, h₂, and h3 to be 238.41, 263.68 and 81.5 kJ kg-¹, respectively. b. The coefficient of performance (COP) based on your answer to (a). c. The compressors mechanical efficiency. d. The COP based on the actual power input. P @ 5.673 bar 3 T @ 15 °C 4 P @ 0.8071 bar T@ -35 °C Warm condenser Cold evaporator Dout Din 2 P@ 5.673 bar T @ 50 °C Compressor 1 P@ 0.8071 bar T@ -20 °Carrow_forward15- R134a enters a compressor with a heat loss of 200 W as saturated steam at -24 ºC and after compressing to 0.8 MPa, it exits the compressor at 60 ºC. The mass flow of R134a is 1.2 kg/s. Calculate the volumetric flow of the refrigerant at the compressor inlet. A-0,129 m3/sB-0,293 m3/sC-0,163 m3/sD-0,209 m3/sE- 0,347 m3/s (Note: This Turkish I'm using translate) orginal; R134a ısı kaybı 200 W olan bir kompresöre doymuş buhar olarak -24 ºC sıcaklıkta girmekte ve 0.8 MPa basınca sıkıştırıldıktan sonra kompresörden 60 ºC sıcaklıkta çıkmaktadır. R134a’nın kütlesel debisi 1.2 kg/s’dir.Soğutucu akışkanın kompresör girişindeki hacimsel debisini hesaplayınız.arrow_forward
- A completely insulated mixing vessel is designed to deliver water at 60 ⁰Cand atmospheric pressure at a rate of 4 kg/s by mixing two streams of incomingwater in an environment at 25 ⁰C. Saturated steam at atmospheric pressure isinserted on the hot side. Two options are being considered for the cold side: (a)chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both atatmospheric pressure).(i) Determine the mass flow rate of steam and chilled water in each case.(ii) Determine the thermal efficiency of each process.(iii) Determine the exergetic efficiency of each process, defined here as exergy outdivided by exergy in.(iv) Based on the previous answers, discuss which process makes better use ofavailable resources and why.arrow_forwardA completely insulated mixing vessel is designed to deliver water at 60 ⁰Cand atmospheric pressure at a rate of 4 kg/s by mixing two streams of incomingwater in an environment at 25 ⁰C. Saturated steam at atmospheric pressure isinserted on the hot side. Two options are being considered for the cold side: (a)chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both atatmospheric pressure). 1. Determine the thermal efficiency of each processarrow_forwardI need help on the following question: The vapour compression cycle (picture provided), utilises the refrigerant R134a flowing at 0.05 kg s-1. Assuming that the compression is adiabatic and reversible. If the actual input power to the compressor is 2 kW, then: 1. You need to determine the theoretical input power to the compressor and the heat transfer (Φ) to theevaporator. Take the enthalpies h1, h2, and h3 to be 238.41, 263.68 and 81.5 kJ kg-1 (use the 'NH3 Refrigeration Table' where you can find online). 2. You need to determine the coefficient of performance based on your answer to the previous question (1). 3. You need to determine the compressors mechanical efficiency.arrow_forward
- Exercise 6.1 (20%) Refrigerant R-134a at 700 kPa and 70°C (condition 1) is cooled/condensed at constant pressure using cooling water in a condenser (heat exchanger). The refrigerant (R-134a) flows out of the condenser at 6.69°C subcooled at 700 kPa (state 2). The conditions of the cooling water at the inlet and outlet of the heat exchanger are 150 kPa, 15°C (condition 3) and 150 kPa, 25°C (condition 4). The mass flow of the cooling water is 10 kg/min a) Draw a sketch of the device (remember to put numbers for conditions and relate to these in your use of symbols) and calculate the mass flow of refrigerant R-134a in kg/min. b) How much heat power is transferred between the fluids in kW? Exercise 6.2 (30%) Subcooled water first flows through an adiabatic choke valve and then into an adiabatic separator. Before the throttle valve, the water is at 5 MPa and 180°C and the mass flow is 200 kg/s. The throttle valve reduces the pressure to 300 kPa. This is also the pressure in the mass flows…arrow_forwardAir goes through a Brayton cycle gas turbine, entering the compressor at 11 °C and 108 kPa. When it reaches the turbine inlet, the air is at 1,061 °C and 1.23 MPa. What is the net change in specific enthalpy of the working fluid after going through the compressor and heat addition processes? You may assume that the specific heat capacity c, is a constant 1.005 --1. kJ-kg 1.K1 throughout the whole cycle. Give your answer in kJ-kg1 to one decimal place.arrow_forwardCan you show me how to solve thisarrow_forward
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