##### ‏The ceiling of an ice skating rink should have a high reflectivity to avoid condensation on...

‏The ceiling of an ice skating rink should have a high reflectivity to avoid condensation on the ceiling . If condensation forms on the ceiling , water may drip ca ice . The rink has a diameter of 50m and a height of 12m . The temperature of the ice and walls are -5 ° C and 15 ° C respectively . The air in the rink is also at 15 ° C Neglect the convective losses to the outside air . If the ceiling is a diffese - gray surface and the ice and walls can be approximated as black bodies , perform an energy balance on the ceiling to calculate the ceiling temperature . If the relative humidity of the rink air is 70 % and the dew point is 9c , will condensation occur if a coating is added that provides an emissivity of 0.05 ?

In: Mechanical Engineering

##### Air enters the turbine of a gas turbine at 1400 kPa, 1400 K, and expands to...

Air enters the turbine of a gas turbine at 1400 kPa, 1400 K, and expands to 100 kPa in two stages. Between the stages, the air is reheated at a constant pressure of 350 kPa to 1400 K. The expansion through each turbine stage is isentropic.

Determine:

(b) the heat transfer for the reheat process, in kJ/kg of air flowing.

(c) the increase in net work as compared to a single stage of expansion with no reheat.

In: Mechanical Engineering

##### hi please elaborate axial flow pumps working principle with labelled and the flow image , application...

hi please elaborate axial flow pumps working principle with labelled and the flow image , application and limitation .

In: Mechanical Engineering

##### Hello! In Ansys Fluent, how can I calculate the molar concentration (kmol/m^3) of a species and...

Hello! In Ansys Fluent, how can I calculate the molar concentration (kmol/m^3) of a species and molar fraction (dimensionless) of a species in fluent after I put an exact amount of the mass (kg) of a species at a boundary? Thank you, I will thumb you up!

In: Mechanical Engineering

##### Make a mindmap that contain: a- Relationship between Mechanical Energy Equation and internal flow analysis. b-...

Make a mindmap that contain:

a- Relationship between Mechanical Energy Equation and internal flow analysis.

b- Flow regimes - Search on the turbulent, laminar and transitional flow regimes. Describes them and give example when/where they occurs.

c- Region in pipe flow - Search on hydrodynamic entrance length, boundary layer region/viscous flow region, hydrodynamically developing region and hydrodynamically fully developed region. Describes them and show how to calculate them.

In: Mechanical Engineering

##### Give two practical examples for following concepts/principles. Also write where these are used with brief explanation:...

Give two practical examples for following concepts/principles. Also write where these are used with brief explanation: (a) Centroid (b) Moment of inertia (c) General plane motion (d) Work energy principle (e) Impulse-momentum principle

In: Mechanical Engineering

##### Force (N) time (s) Elongation (t*0.05 mm/s) Engineering stress(Mpa) Engineering Strain 0 0 0 0 0...

 Force (N) time (s) Elongation (t*0.05 mm/s) Engineering stress(Mpa) Engineering Strain 0 0 0 0 0 1500 5 0.25 53.05978069 0.00625 5000 10 0.5 176.8659356 0.0125 9250 20 1 327.2019809 0.025 11250 25 1.25 397.9483551 0.03125 11750 30 1.5 415.6349487 0.0375 11500 32.5 1.625 406.7916519 0.040625 12000 35 1.75 424.4782455 0.04375 14250 50 2.5 504.0679165 0.0625 15250 60 3 539.4411036 0.075 16000 70 3.5 565.970994 0.0875 16750 85 4.25 592.5008843 0.10625 17250 100 5 610.1874779 0.125 17500 132.5 6.625 619.0307747 0.165625 17250 170 8.5 610.1874779 0.2125 17000 180 9 601.3441811 0.225 16500 190 9.5 583.6575875 0.2375 16250 195 9.75 574.8142908 0.24375 16000 200 10 565.970994 0.25 15000 210 10.5 530.5978069 0.2625 13250 220 11 468.6947294 0.275 12697.1 222.5 11.125 449.1368942 0.278125 Initial Length (mm) Initial Diameter(mm) Area = pi*r^2 40 6 28.27

Maximum load capacity: 50,000 N Test rate: 3 mm/min - 0.05 mm/s Steel A Steel B Initial length, Lo 40 mm 40 mm Initial diameter, do 6 mm 6 mm Final length, Lf 48 mm 52 mm Final diameter, df 4.2 mm 3.1 mm

From the data given in excel file, calculate:

(b) Tensile strength, modulus of elasticity, modulus of resilience, % elongation and % reduction in area.

(c) Plot both engineering stress strain curve and true stress strain curve.

(d) Compare the tensile behaviour of steel A and B in one paragraph

In: Mechanical Engineering

##### For an ideal gas-turbine cycle with two stages of compression and two stages of expansion, the...

For an ideal gas-turbine cycle with two stages of compression and two stages of expansion, the pressure ratio across each stage of the compressor and turbine is 3. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1200K. Using variable specific heats, determine the back work ratio and the thermal efficiency of the cycle, assuming

(a)no regenerator is used,

(b)a regenerator with 75% effectiveness is used.

In: Mechanical Engineering

##### Write a detailed understanding about the history, current trends and future research of 'Ground Support Vehicles...

Write a detailed understanding about the history, current trends and future research of 'Ground Support Vehicles for Guided Missile Programme' pertaining to India and also the international scenario. Include case studies.

In: Mechanical Engineering

##### As a person serving in the role of a safety practitioner, how would you explain to...

As a person serving in the role of a safety practitioner, how would you explain to a new worker the difference between engineering and administrative controls and how they relate to a specific work environment? Be specific in your response, and include examples of your work environment.

 l
 t)

In: Mechanical Engineering

##### A single-cylinder, four stroke research engine operates on Otto cycle. The specification of the engine is...

A single-cylinder, four stroke research engine operates on Otto cycle. The specification
of the engine is shown as below:-
Displacement volume of the cylinder = 540 cm3
Clearance volume of the cylinder = 60 cm3
Minimum temperature = 200°C
Minimum pressure = 200 kPa
Net work output = 1000 kJ/kg
Sketch the process on a P-V diagram and by using constant specific heat at room
temperature, determine:
i) the temperature and pressure at each process,
ii) the thermal efficiency of the engine, and
iii) the Mean Effective Pressure (MEP).

In: Mechanical Engineering

##### An Otto Cycle engine operation at cold-air standard has a volume of 0.1908 at the beginning...

An Otto Cycle engine operation at cold-air standard has a volume of 0.1908 at the beginning of isentropic compression. If the compression ratio is 12.5, how much heat is released from the fuel per kg of fuel burned if the fuel consumption is 0.02 kg/min? The mean effective pressure is 350kPa.

In: Mechanical Engineering

##### heat transfer question, show equations, assumptions, calculations and steps clearly. will give thumbs up rating if...

heat transfer question, show equations, assumptions, calculations and steps clearly. will give thumbs up rating if solved correctly in 30 minutes

Define thermal diffusivity (α) and give its mathematical expression.

In: Mechanical Engineering

##### A double pane window consists of two pieces of glass each of 8 mm thick that...

A double pane window consists of two pieces of glass each of 8 mm thick that enclose an air space of 8 mm thick. The window separates room air at 18°C from outside ambient air at -8°C. The convection coefficient associated with the inner (room-side) surface is 12W/m2 .K. The thermal conductivity of the glass is kg=1.35 W/m. K and that of the air is ka=0.027 W/m. K Q1- If the outside air convection coefficient is ho = 76 W/m2 .K what is the heat loss through a window that is 0.8 m long by 0.5 m wide? Neglecting radiation and assume the air enclosed between the panes to be stagnant. Q2- We consider now that the heat transfer in the air gap is transferred by conduction and radiation and that the radiation coefficient hrad = 3 W/m2 K . Show the thermal circuit representing the steady state situation and define the new heat transfer loss through the window.
(Non-anonymous question )
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In: Mechanical Engineering

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