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Your neighbor lives in a 2500-square-foot (about 250 m2) older house heated by natural gas. The current gas heater was installed in the early 1970s and has an efficiency (called the Annual Fuel Utilization Efficiency rating, or AFUE) of 65 percent. It is time to replace the furnace, and the neighbor is trying to decide between a conventional furnace that has an efficiency of 80 percent and costs $1500 and a highefficiency furnace that has an efficiency of 95 percent and costs $2500. Your neighbor offered to pay you $100 if you help him make the right decision. Considering the weather data, typical heating loads, and the price of natural gas in your area, make a recommendation to your neighbor based on a convincing economic analysis.
a four-cylinder four-stroke internal combustion engine has a bore of 6.5 cm and a stroke of 5.3 cm. the clearance
a closed tank v 10 l containing 5 kg of water initially at 25degc is heated to 175degc by a heat pump that is
The member has a square cross section and is subjected to a resultant internal bending moment of M = 850 Nm as shown. Determine the stress at each corner and sketch the stress distribution produced by M. Set theta = 30 (dimensions 250mm by 250 mm)
A solar energy collector produces a maximum temperature of 100°C. The collected energy is used in a cyclic heat engine that operates in a 5°C environment. Estimate the thermal efficiency if the engine operates at 40% of Carnot efficiency. How would t..
an air standard diesel cycle has a compression ratio of 17 the pressure at the beginning of the compression stroke is
air enters an insulated diffuser operating at steady state with a pressure of 105 nm2 and a temperature of 57 degrees
A vapor-compression refrigeration system, using ammonia as the working fluid, has evaporator and condenser pressures of 30 and 200 lbf/in.2, respectively. The refrigerant passes through each heat exchanger with a negligible pressure drop.
A 20-mm diameter rod made of a ductile material with a yield strength of 350 MPa is subjected to torque of 100 N.m and a bending moment of 150 N.m. An axial force is then gradually applied. Determine the value of force when the rod begins to yield..
Water enters a 2 meter diameter pipe at a temperature of 23 deg C. The water leaves the pipe at a temperature of 97 deg C The laminar flow rate is such that the Reynolds number is 800. What is the mass flow rate?
at the beginning of the compression stage in an air-standard diesel cycle the conditions are p 200 kpa and t 380k. the
consider steady two dimensional heat transfer in a square cross section 3cm x 3cm with the prescribed temperatures at
the 22 kg block is towed up the ramp of the 43kg cart using the motor mounted on the side of the cartif the motor winds
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