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A freezer is 1m wide and deep and 2m high and must operate at -10C when the ambient air is at 30C. What thickness of polysterene is required if the load on the refrigeration unit should not exceed 2
A secondary settling tank is to be designed for a municipal wastewater treatment facility. List one advantage and one disadvantage to circular tanks.
Some nitrogen is allowed to escape until the pressure in the tank drops to 400 kPa. If the temperature at this point is 20°C, determine the amount of nitrogen that has escaped.
Determine the total amount of heat transfer from the environment to the tank to vaporize the entire propane in the tank.
The bars are subjected to equal twisting moments. Determine the ratio of the maximum shear stresses in the two bars, assuming that they are elastic.
If the engines provide a constant thrust of T=300 kN, determine the power output of the engines as a function of time. Neglect the effect of drag resistance and the loss of fuel mass and weight.
A fan drawing electricity at a rate of 1.5 kW is located within a rigid enclosure, measuring 3m x 4m x 5m. Determine for the air final temperature after 30 minutes, in degrees C.
If the work during the process is +300 kJ, determine (a) the mass of the water, in kg, and (b) the heat transfer in kJ.
A secondary settling tank is to be designed for a municipal wastewater treatment facility. Determine the diameter of the settling tank if it were circular (1 ft increments)?
A primary settling tank is to be designed for a municipal wastewater treatment facility. The average design flow is 2 MGD (peaking factor 2.1). Determine the diameter of the settling tank.
Determine a) The initial and final temperature, b) the mass of the liquid water when the piston first starts moving, and c) work done during the process. Also, show the process on a P-v diagram.
What is the new position of the bottom of the block ? Assume that the tank containing the fluid is of infinite dimensions.
The signal at the sensor is 10V and thee current in the wire is about 10 mA. Find the voltage of the signal at the controller.
The lever is 10ft and the fulcrum is 2 ft from the rock. How much force must be applied on the other end of the lever to lift the rock.
Considering air inside the cylinder as the system, calculate the work done by the system and the percentage of the work done against the spring.
During the process, the spring exerts a force that varies linearly from an initial value of 0 N to a final value. Find the has pressure pg if the system is in equilibrium before adding the heat.
Water (cp= 4182 J/kg.K) at a flow rate of 5000 kg/hr is heated from 10* C to 35* C in an oil cooler by engine oil (cp = 2072 J/kg.K) What are the areas required for Parallel flow.
The same thermophysical properties as air enter at 350* C and exit at 175* C. Determine the overall heat transfer coefficient based on the outside surface area.
Calculate the true mean temperature difference for two-shell-pass-and-four-tube passes and one-shell-pass-and-two-tube passes shell-and-tub heat exchangers
Find the total turbine work and the total heat transfer to the boiler for this process. Assume the turbine is adiabatic and the change in the kinetic and potential energy across the turbine is negli
Derive an expression for the net work transfer for the cycle. Prove that for a Stirling Cycle, the net work transfer is always from the system to the surroundings. Do not attempt to put numbers in.
The piston pressure is released in three stages, first to 5 x 10^6 Pa then to 1 x 10^6 Pa, and then to 1 x 10^5 Pa Calculate the work done by the gas during these irreversible, isothermal expansions
If the power generated by the turbine is 4 MW, determine the rate of entropy generation for this process. Assuming the surrounding medium is at 25?.
Indicate how you would predict this new shower temperature (assume the shower faucet is not adjusted.) State any assumptions needed in your analysis.
Show the T-S diagram with respect to saturation lines and determine a) The rate of heat supply to the house b) The volume flow rate of the refrigerant at the compressor inlet and COP of this heat pu