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Find the ratio QH2/QH1 as a function of the temperatures. Is this a better set-up than direct room heating from the furnace?
What is the maximum thermal efficiency? What is it if the collector is redesigned to focus the incoming light to produce a maximum temperature of 300ºC?
A household freezer operates in a room at 20ºC. Heat must be transferred from the cold space at a rate of 2 kW to maintain its temperature at -30ºC.
The exit conditions are 500 kPa, 1000°C. Kinetic and potential energy changes are negligible. Calculate the required heat transfer per kg of nitrogen.
The specification is that the percent reduction is to be equal on each pass. Determine what is the minimum number of passes required and what the draft for each pass is?
Calculate the power required to drive the compressor and the heat loss. Consider the pipe diameter at the inlet is 5 cm and that at the exit is 2 cm.
The rate of flow of steam is 0.5 kg/s. Calculate the quality or temperature of the steam leaving the nozzle and the exit area of the nozzle.
Calculating the velocity gradient across the 80 cm height of the vessel. Solve the problem using cyclindrical coordinates but you do not need to use the full Navier-Stakes equation.
Calculate the energy efficiency of a continuous glass melter that uses room temperature air for burning methane gas. Assume 0% excess air.
The drive sprocket has 27 teeth and the sprocket on the escalator has 68 teeth. Determine the speed of the driven sprocket, the chain speed and the recommended lubrication method.
Calculate the actual belt speed and the actual center distance. the motor sheave diameter must be 4.5 inch and the sheaves should be about 40 inch apart.
The duct surface is maintained at 100 degrees C. Assuming fully developed flow through the duct, determine the air outlet temperature. (Evaulate the air pressure properties at 325K to avoid iteratio
Determine the mass flow rate of the steam, in kg/h, the heat transfer rates for the working fluid passing through the boiler and condenser, each in kW, and the thermal efficiency.
At the exit, P2 = 15 bar, and the velocity is 665 m/s. The mass flow rate is 2 kg/s. Determine the exit area of the nozzle, in m2.
The pipe in problem above is subject to 2500 in lb bending moment and 800 in lb torsion. Compute the maximum shear stress in the pipe.
Determine the speed at the pump exit and the pressure drop p1-p2. Note, of course, that a similiar sitatuion could exist within an artery due to a high velocity flow through a needle or catheter.
Assume no slipping of the cylinder and determine the velocities of points D, E and C on cylinder A. If B drops 4m, how far does cylinder A move to the right. Cylinder A diameter 0.90 m. Slot diamete
Design the condenser of a steam power plant that has a thermal efficiency of 40 percent and generates 10 MW of net electric power.
Find: Considering only loss of heat from water heater, what is total energy loss for 6 months continuous operation (do not include energy to heat water initially or to heat water as is used)
Find the centroid and moment of inertia (Ix) of a composite steel structure. The structure is built out of a 2" thick by 20" long steel plate welded to a piece of 1" thick pc of "c" channel.
The pressure is held constant as the air cools to 50°C. Assuming that the rate of flow entering the compressor is 0.15 kg/s, determine the total rate of entropy generation.
Develop a schedule for gasoline consumption and maximum cycle temperature versus power production for an Otto cycle with a compression ratio of 8.
Consider oxygen undergoing a steady-state, steady-flow, polytropic process (n = 1.2) from an initial temperature and pressure of 300 K and 100 kPa to a final temperature of 750 K.
Determine the work required to compress steam isentropically from 100 kPa to 1 MPa, assuming that the steam exists as (a) saturated liquid and (b) saturated vapor at the initial state.
Compressed air is to be supplied by a compressor which takes in atmospheric air at Po = 100 kPa and To = 300 K. Determine the minimum amount of work (i.e. the process is reversible) required for this