Show the heat pump that operates on the ideal vapor-compression refrigeration cycle, with refrigerant-134a as the working fluid, on T-s diagram as in Figure (1). T House 1.4 MPa 3 Win 320 kPa 4 S step: 2 of 8 For the given ideal vapor-compression refrigeration cycle, with refrigerant-134a as the working fluid,specific entropy, specific enthalpy, pressure, and specific volumeat state are $1, ", i, and Yrespectively. Also, the saturated liquid state is denoted by the subscript f, the saturated vapor is denoted by the subscript g, and the properties at latent stage are denoted by the subscript fg. step: 3 of 8 (a) Use â€œsaturated refrigerant-134a

Show the heat pump that operates on the ideal vapor-compression refrigeration cycle, with refrigerant-134a as the working fluid, on T-s diagram as in Figure (1). T House 1.4 MPa 3 Win 320 kPa 4 S step: 2 of 8 For the given ideal vapor-compression refrigeration cycle, with refrigerant-134a as the working fluid,specific entropy, specific enthalpy, pressure, and specific volumeat state are $1, ", i, and Yrespectively. Also, the saturated liquid state is denoted by the subscript f, the saturated vapor is denoted by the subscript g, and the properties at latent stage are denoted by the subscript fg. step: 3 of 8 (a) Use â€œsaturated refrigerant-134a

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A heat pump with refrigerant-134a (R-134a) as the working fluid is used to keep a space at 21 °C by absorbing heat from geothermal water that enters the evaporator at Ti,water = 60 °C at a rate of 0.067 kg/s and leaves at To,water = 40 °C. The specific heat of liquid water is 4.18 kJ/(kg∙K). Refrigerant enters the evaporator at TR-134a = 10 °C with a quality of x = 12 % and leaves at the same pressure as saturated R-134a vapor at the same temperature. The compressor consumes 1.4 kW of power. 1)Determine the mass flow rate (in kg/s) of the refrigerant. 2)Determine the rate of heat (in kW) supplied to the space. 2)Determine the COP of the heat pump. 4)Determine the ideal minimum power input (in kW) to the compressor for the same rate of heat supply
A reversible heat pump is working between 9°C and 28°C. The minimum power required per ton on heating effect is W.
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B- A steam generation unit in power plant operates at a constant pressure of (10 bar) and the water evaporates at the rate of (0.9 from the total mass flow rate of water). Inlet and leaving water enthalpy are (200 kJ/kg) and (2000 kJ/kg) respectively. The inlet and outlet velocity are (10 m/s) and (25 m/s) respectively. If 80% of the heat energy supplied to the steam generation unit is used in evaporating the fluid. Determine the heat evaporation and work done if the inlet and outlet diameter are the same level. The fuel produces 28000 kJ of heat energy for one kg and the mass flow rate of water is 1000 kg/h.
For each control volume analyzed, the thermodynamics model is the steam tables, the process is SSSF (steady state, steady flow), and the changes in kinetic and potential energies are negligible. Consider a reheat cycle utilizing steam. Steam leaves the boiler and enters the turbine at 4 Mpa, 400°C. After expansion in the turbine to 400 kPa, the steam reheated to 400ºC and then expanded in the low pressure turbine to 10 kPa. Determine the cycle efficiency.
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Using the ideas in heat pumps under cyclic process, thoroughly explain the following(with diagram if possible)
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A steam power-plant, with a power of "Wnet", is working according to the Rankine cycle. Steam enters the system in "P3"MPa pressure and 500 C degree temperature, and cooled down in condenser at 10 kPa pressure. Take Source temperature as "TH", and sink temperature 290 K. According to the information given. P3 = 6 MPa, %3D Wnet = 201 MW, TH = 1600 K Determine: 1.Heat generated (MW)(Not Heat given) 2.Pump entrophy generation (MW/K) 3.Combustion chamber entrophy generation (MW/K) 4.Turbine entrophy generation (MW/K)
Consider the re-heat regenerative cycle as shown in the figure below:Suppose that the boiler operates at a constant pressure of 15MPa. The High Pressure turbine expands steam until 4MPa. The Low-pressure turbine then achieves expansion to 700 kPa and 20 kPa. Determine the specific work of Pump II in kJ/kg. a.3.66 b.0.69 c.15.23 d.15.84