ࡱ> (*'~M Ebjbj== "<WWq l*:::N8DV$N$H $8 Xn:  ::  : :   & ;:: z aTN S0$[,p x NN::::CHE312: Problem set #1 1. (1.37) The energy consumption associated with a home water heater has two components: (i) the energy that must be supplied to bring the temperature of ground water to the heater storage temperature, as it is introduced to replace hot water that has been used, and (ii) the energy needed to compensate for heat losses incurred while the water is stored at the prescribed temperature. In this problem, we will evaluate the first of these components for a family of four, whose daily hot water consumption is approximately 100 gallons. If ground water is available at 15oC, what is the annual energy consumption associated with heating the water to a storage temperature of 55oC? For a unit electrical power cost of $0.08/kWh, what is the annual cost associated with supplying hot water by means of (a) electric resistance heating or (b) a heat pump having a COP of 3 and a compressor efficiency of 85% (conversion from electrical energy to mechanical work). Water density = 993 kg/m3 at 0.5(15 + 55) = 35oC = 308 K, Cpw = 4.187 kJ/kg(K, 100 gal = 0.3785 m3 (a) Annual cost associated with supplying hot water by means of electric resistance heating Resistance heating cost = (6369 kWh)($0.08/kWh) = $510 (b) Annual cost associated with supplying hot water by means of a heat pump Heat pump cost = (2498 kWh)($0.08/kWh) = $200 Operating costs are lower for a heat pump, capital costs are higher. 2. (1.491) Liquid oxygen, which has a boiling point of 90oK and a latent heat of vaporization of 214 kJ/kg, is stored in a spherical container whose outer surface is of 500-mm diameter and at a temperature of (10oC. The container is housed in a laboratory whose air and walls are at 25oC. (a) If the surface emissivity is 0.20 and the heat transfer coefficient associated with free convection at the outer surface of the container is 10 W/m2(K, what is the rate, in kg/s, at which oxygen vapor must be vented from the system? (b) Moisture in the ambient air will result in frost formation on the container, causing the surface emissivity to increase. Assuming the surface temperature and convection coefficient to remain at (10oC and 10 W/m2(K, respectively, compute the oxygen evaporation rate (kg/s) as a function of surface emissivity over the range 0.2  EMBED Equation.3  (  EMBED Equation.3  0.94. (a)  EMBED Equation.DSMT4  = 1.41(10-3 kg/s (b) Compute the oxygen evaporation rate (kg/s) as a function of surface emissivity over the range 0.2  EMBED Equation.3  (  EMBED Equation.3  0.94.  3. (1.551) The roof of a car in a parking lot absorbs a solar radiant flux of 800 W/m2, while the underside is perfectly insulated. The convection coefficient between the roof and the ambient air is 12 W/m2(K. (a) Neglecting radiation exchange with the surroundings, calculate the temperature of the roof under steady-state conditions if the ambient air temperature is 20oC. (b) For the same ambient air temperature, calculate the temperature of the roof if its surface emissivity is 0.8. (c) The convection coefficient depends on airflow conditions over the roof, increasing with increasing air speed. Compute and plot the roof temperature as a function of h for 2  EMBED Equation.3  h  EMBED Equation.3  200 W/m2(K. Solution (a) 86.7oC (b) 47oC (c) Compute and plot the roof temperature as a function of h for 2  EMBED Equation.3  h  EMBED Equation.3  200 W/m2(K.  4. (1.591) A surface whose temperature is maintained at 400oC is separated from an air flow by a layer of insulation 25 mm thick for which the thermal conductivity is 0.1 W/m(K. If the air temperature is 35oC and the convection coefficient between the air and the outer surface of the insulation is 500 W/m2(K, what is the temperature of this outer surface? T2 = 37.9oC 5. (1.611) An experiment to determine the convection coefficient associated with airflow over the surface of a thick steel casting involves insertion of thermocouples in the casting at distances of 10 and 20 mm from the surface along a hypothetical line normal to the surface. The steel has a thermal conductivity of 15 W/m(K. If the thermocouples measure temperatures of 50 and 40oC in the steel when the air temperature is 100oC, what is the convection coefficient? h = 15,000/(100 ( 60) = 375 W/m2(K 6. (1.651) Plate glass at 600oC is cooled by passing air over its surface such that the convection heat transfer coefficient is h = 5 W/m2(K. To prevent cracking, it is known that the temperature gradient must not exceed 15oC/mm at any point in the glass during the cooling process. If the thermal conductivity of the glass is 1.4 W/m(K and its surface emissivity is 0.8, what is the lowest temperature of the air that can initially be used for the cooling? Assume that the temperature of the air equals that of the surroundings. T( = 618 K = 345oC 7. A cylinder of radius ro, length L, and thermal conductivity k is immersed in a fluid of convection coefficient h and unknown temperature T(. At a certain instant the temperature distribution in the cylinder is T(r) = a + br2, where a and b are constants. Obtain expressions for the heat transfer rate at ro and the fluid temperature. q|ro = ( 2(roLk EMBED Equation.DSMT4  = ( 2(roLk(2bro) = 2(roLh(T|ro ( T() (2bkro) = h(T|ro ( T() ( T( = a + bro2 (  EMBED Equation.DSMT4  8.2 In the two-dimensional body illustrated, the gradient at surface A is found to be (T/(y = 30 K/m. What are (T/(y and (T/(x at surface B?  Solution  EMBED Equation.DSMT4  = 0,  EMBED Equation.DSMT4  = 0 Energy balance over the body qA = qB ( qy,A = qx,B ( k(1)(wA) EMBED Equation.DSMT4 = ( k(1)(wB) EMBED Equation.DSMT4   EMBED Equation.DSMT4  = EMBED Equation.DSMT4   EMBED Equation.DSMT4  = (2)(30) = 60 K/m  Fundamentals of Heat Transfer by Incropera and DeWitt  Fundamentals of Heat Transfer by Incropera and DeWitt      !"ST %&;<K O h i k l O P Q l m o p | } ~      ! " . / F » jEHUjA CJUVaJ je jEHUj~A CJUVaJ jU j- 5H*\5 jH*6]H*j0J5U\5\5CJ\aJ@=>! 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"2~eOxQa1/7}Zq`!ReOxQa1/7}@ (+ xڥS1o@Fi1.AC%( 0M Pqj RҠ$ E(%_W JG7V 3B|'Gd}WxE!1mµьOzEB_y9֔T.(^0,-J^ONןhm&+Y$#pimc4BkgS%|J#f Lk('h.o_q2󇵭 ,=&3L^ks˝u]l;תѾ aӹ"٩mV` au ؏܂7-`]lG>`x4Yl*XU9MhMB%|"VQӠB1]@:+A&r^ ufޓa.1#iufU]A{+7(W5ᡢwN/ΈP̿1TableSummaryInformation(BdDocumentSummaryInformation8l4CompObjqjuyenet kngkng Normal.dot  Thuan Nguyen13uaMicrosoft Word 9.0@V@XA@FT@ȝTK՜.+,0 hp  Cal Poly Pomona(  Problem set #1 Title  FMicrosoft Word Document MSWordDocWord.Document.89q i8@8 NormalCJ_HaJmH sH tH <A@< Default Paragraph Font6@6  Footnote TextCJaJ8&@8 Footnote ReferenceH* E8psE<=>!"PQ) * [ \ v y z cd \]679<?BF00000000000000000000000000000000000000000000000000000000000000000000@0@0 0@0@0@0@0 0 F s1E ED   ! . F H ; O Q U i k s13@XZ^vx{E::::::::::::::::::!!) ) * I ; R U l z z cds4@[^y{67799::<=?@BCFQz|de7799::<=?@BCF333333333!!) ) * I ; R U l z z cds4@[^y{F Thuan NguyencC:\Documents and Settings\tknguyen\Application Data\Microsoft\Word\AutoRecovery save of Set1sol.asd Thuan NguyencC:\Documents and Settings\tknguyen\Application Data\Microsoft\Word\AutoRecovery save of Set1sol.asd Thuan NguyenQC:\Documents and Settings\tknguyen\Desktop\swim2001\che312\hwsolution\Set1sol.doc Thuan NguyencC:\Documents and Settings\tknguyen\Application Data\Microsoft\Word\AutoRecovery save of Set1sol.asd Thuan NguyencC:\Documents and Settings\tknguyen\Application Data\Microsoft\Word\AutoRecovery save of Set1sol.asd Thuan NguyencC:\Documents and Settings\tknguyen\Application Data\Microsoft\Word\AutoRecovery save of Set1sol.asd Thuan NguyenQC:\Documents and Settings\tknguyen\Desktop\swim2001\che312\hwsolution\Set1sol.doc Thuan NguyenQC:\Documents and Settings\tknguyen\Desktop\swim2001\che312\hwsolution\Set1sol.doc Thuan NguyenQC:\Documents and Settings\tknguyen\Desktop\swim2001\che312\hwsolution\Set1ans.doc Thuan NguyenQC:\Documents and Settings\tknguyen\Desktop\swim2001\che312\hwsolution\Set1ans.doc+ j808^8`0o(()^`.pLp^p`L.@ @ ^@ `.^`.L^`L.^`.^`.PLP^P`L.+ ruG        5F@ddpZdcEp@UnknownGz Times New Roman5Symbol3& z Arial] MS MinchoArial Unicode MS"1h\\2lK ( .y$0d) 2QHPProblem set #1tknguyen Thuan Nguyen