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An energy-efficient house has been constructed so tightly that there is no air exchange with the outside. While this airtight construction greatly reduces heating and cooling needs for the house, building codes specify that for the health of the occupants there should be an air exchange rate of 10 m3/min. In order to comply with code yet preserve the energy efficiency of the house, a heat exchanger is installed. (See picture below.) Assume the temperature of the outside air is 0oC and the temperature of the inside is maintained at 21oC and the heat exchanger heats the outside air to 19oC. 1. If the mass flow of incoming air is the same as outgoing air, what is the temperature of the air exiting the heat exchanger to the outside? 2. What is the heat loss rate for the properly-vented house with the heat exchanger installed? 3. What is the heat loss rate if an el-cheapo vent fan were installed in the wall to deliver the exchange rate?
a specimen of aluminum having a rectangular cross section 9.7 mm times 12.4 mm0.3819 in. times 0.4882 in. is pulled in
water is the working fluid in an ideal rankine cycle. superheated vapor enters the turbine at 8 mpa 480 degrees
a child drops a rock into a well and hears it splash into the water at the bottom exactly 2 seconds later. if she is at
an insulated piston-cylinder device initially contains 0.3 m3 of carbon dioxide at 200 kpa and 27 ordmc. an electric
consider the constant -property steady laminar flow illustrated in fig 2p-4 a fluid flow through a very long tube in
finding the time interval for the motorcyclist to reach a given acceleration if the motorcyclist starts from rest
the friction force acting at the chip-tool interface the main (tengential ) cutting force is 1500N . Find the orthogonal rake angle of the cutting tool?
problem 1 the u-tube manometer shown below is open to the atmosphere and partiallynbspfilled with water so that the
coast guard pararescue jumpers are trained to leap from helicopters into the sea to save boaters in distress. the
in water at a depth of 7 m the absolute pressure is read to be 164 kpa. determine a the local atmospheric pressure and
Solve for the pressure of a gas using both equations at a temperature of 400K and a molar volume of 1x 10-4 m3/mol. For the van der Waals EOS, use parameters of a= 4.1x10-1 (m3/mol)2 Pa, and b=4.3x10-5 m3/mol.
A square 3m x 3m gate is located in the 45* sloping side of a dam. Some measurements indicate that the resultant force of the water on the gate is 500kN.(a)Determine the preassure at the bottom of the gate.(b)Show on a sketch where this force acts..
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