( ) 1. Thermodynamic is a science of energy 2. Closed system is also called control volume 3. Steam power plant cycle is employed to produce a mechanical and electrical energy

A heat pump is used to maintain the interior of a building at 21 °C. At steady state, the heat pump receives energy by heat transfer from well water at 9°C and discharges energy by heat transfer to the building at a rate of 120000 kJ/h. Over a period of 14 days, an electric meter records that 1490 kW-h of electricity is provided to the heat pump.      1. Draw a schematic diagram(s)

4.5 thermodynamics

Derive the seven general property equation of the following thermodynamics processes:   a. POLYTROPIC PROCESS

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Describe the several phrases in common use today for energy transfer.

7. thermodynamics

4. Which thermodynamic property is the best measure of the molecular activity of a substance? a. Enthalpy b. Internal energy c. Entropy d. External energy 5. A substance whose properties are uniform throughout a sample is referred to as a. A solid b. An ideal substance c. A pure substance d. A standard substance 6. Which of the following statements is true for an isentropic steady-flow process? a. P1 b. Work = -V(P2 – P1) P2 - V1 C. %3! P1 V2 d. T1 T2

A cycle composed of three processes, 1-2: constant volume.2-3 expansion with PV = constant and 3-1: constant pressure, occurs in a piston cylinder assembly. V1=0.025 m^3. U2-U1= 26.4 kJ. P1= 1.8 bar. U2=DU3. Work of process 3-1 is equal to -12.3 kJ. Determine the relative increase in the value of Qcycle if the process 2-3 is replaced by a polytropic process with n=1.3. Select one: a. 68 % b. 70 % c. 38 % d. 51 % e. 46 %

I need questions d and e