6.5 An engine manufacturer has decided to change one of its engines from a spark ignition type to a compression ignition type. If the swept volume is unchanged, what effect will the change have on:

(i) maximum torque?

(ii) maximum power?

(iii) the speed at which maximum power occurs?

(iv) economy of operation?

In a solar hot water heater, oil is used Using the "effectiveness - NTU" function in the EES Heat Transfer options, calculate the length of pipe and the exit temperature of the water for the following heat exchanger configurations: counter-flow, parallalel-flow, and a 2-pass shell and tube HX. Use the operating conditions listed below to rank the 3 HX configurations based on effectiveness.

Fluids (water: Cp=4.189 kJ/kg-K, oil: Cp=1.75 kJ/kg-K)
mass flow rate (water: 0.5 kg/s, oil: 0.1 kg/s)
pipe diameter = 1 inch
overall heat transfer coefficient = 75 W/m²-K
Ti_water=25 C Ti_oil=120 C To_oil=75 C

Provide a schematic for each of these HX configurations

In a winter season when outside temperature is –1oC, the inside of house is to be maintained at 25oC. Estimate the minimum power required to run the heat pump of maintaining the temperature. Assume heating load as 125 MJ/h.

What would be maximum efficiency of engine that

     can be had between the temperatures of 1150oC

      and 27oC ?

1.A heat engine is supplied with 278 kJ/s of heat at a constant fixed temperature of 283°C and the heat rejection takes place at 5°C. The following results were reported :

(i) 208 kJ/s are rejected, (ii) 139 kJ/s are rejected, (ii) 70 kJ/s are rejected.

    Classify which of the results report a reversible cycle or irreversible cycle or impossible results.

In a winter season when outside temperature is –1oC, the inside of house is to be maintained at 25oC. Estimate the minimum power required to run the heat pump of maintaining the temperature. Assume heating load as 125 MJ/h.

What would be maximum efficiency of engine that

     can be had between the temperatures of 1150oC

      and 27oC ?

1.A heat engine is supplied with 278 kJ/s of heat at a constant fixed temperature of 283°C and the heat rejection takes place at 5°C. The following results were reported :

(i) 208 kJ/s are rejected, (ii) 139 kJ/s are rejected, (ii) 70 kJ/s are rejected.

    Classify which of the results report a reversible cycle or irreversible cycle or impossible results.

Determine whether the following measurements are intrusive or non-intrusive.

(a) Measuring amperage of current in a wire using clamp-on-ammeter

(b) Measuring flow of fluid in a pipe by installing an orifice meter in the pipe

(c) Measuring composition of gases in an exhaust using a device which optically measures transmitted infrared radiation

(d) Determining the surface temperature of a pipe using a thermometer that measures the emitted infrared radiation

(e) Rotational speed of a shaft indicated by a strobotachometer

so I am applying to a field engineer position at Schlumberger, if asked, what do you usually do in your free time? what's a best answer for this? also, what's the biggest decision you have made in your life or biggest challenge? consider I am an international student

With the aid of a diagram explain how a thermal desorption-gas chromatography-mass spectrometer functions for the analysis of VOCs.

Refrigerant 134a enters an air conditioner compressor at 4 bar, 20°C, and is compressed at steady state to 12 bar, 80°C. The volumetric flow rate of the refrigerant entering is 7.5 m3/min. The work input to the compressor is 112.5 kJ per kg of refrigerant flowing. Neglecting kinetic and potential energy effects, determine the magnitude of the heat transfer rate from the compressor, in kW.

One kilogram of water in a piston-cylinder assembly undergoes the two internally reversible processes in series. P₁ = 0.1 MPa, T₁ = 100C, s₁ = s_2​ = 7.3164 kJ/kg*K​, P₂ = 0.5 MPa, T₂ = T₃, P₃ = 1.5 MPa, and u₁ = 2506.7 kJ/kg. Find T₂. Legibly show and explain all work, units, and formulas.

Water at a local bulk temperature of 24°C flows at 0.8 m/s through a smooth, 1.5-cm-ID tube that is kept at 30°C and the flow is fully developed.

a) The system is extremely clean and quiet; therefore, the flow stays laminar regardless of the magnitude of ReD, until a noisy air compressor is turned on in the laboratory. Then the flow suddenly goes turbulent. Calculate the ratio of turbulent to laminar heat transfer coefficients. Use the Gnielinski correlation for turbulent flow.

b) Air at 227°C flows across the pipe at 20 m/s. Find the pipe wall temperature assuming the water flow to be turbulent, h from part a). You may assume a thin-walled pipe. This calculation is performed at the local point where the bulk temperature is 24°C.

Prove that raising the pressure will increase melting point (T_m) of a metal. Use the Clausius-Clapeyron eqn., and remember that the enthalpy of a liquid is larger that the enthalpy of solid. Then consider the difference in molar volumes of the liquid and the solid

Air expands through a turbine operating at steady state. At the inlet, p₁ = 150 lbf/in.², T₁ = 1400°R, and at the exit, p₂ = 14.8 lbf/in.², T₂ = 900°R. The mass flow rate of air entering the turbine is 11 lb/s, and 65,000 Btu/h of energy is rejected by heat transfer.

Neglecting kinetic and potential energy effects, determine the power developed, in hp.