Q31 Calculate the total cooling load for a building at 32° North latitude at time 14 of July,outdoor design temperature 35 °C, daily range DR-11.1 °C and indoor designtemperature 25.5 °C. The building has the following data:A-The ceiling is constructed from 152.4 mm lightweight concrete (I.W concrete) and witha suspended ceiling, dark colour (k-1) and no mechanical ventilation (f= 1). Area= 25 m².B-South window consists of 3 mm one layer without internal shading, area=4 m², U=4.5W/m2 °C. Assume shading coefficient SC=1 and cooling load temperature differenceCLTD=7 °C and cooling load factor CLF=0.55.C- West wall is constructed from 101.6 mm heavyweight concrete wall+finish (H.W.concrete wall+Finish) (group E) and medium colour (k=0.83). Area= 17.5 m².D- There is another window that has one hinge that causes an infiltration rate of 5 L/(s.m)of infiltrated air. The moving window has a height of 1.5 m and a width of 1 m.E- Four occupants in the building. The measured change in the enthalpy is Ah-20 kJ/kg.Assume the building is used as a meeting hall with 15 L/s per person.

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Answered: Q31 Calculate the total cooling load…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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10) A heating system is to be designed for a house with the following specifications Location: Bekaa Outdoor air: 50'F Indoor air. 68F The floor is 80 in 64 in. Type of building house Number of floorsI Floor area: 64 x 80n Floor height: 12 t Window area 25% of wall area Windows: double glazed (U value-0.70) Ait Plaster Outside air Face brick Layer Styrofoam Concrete Inside air Wall space board properties 1.75 0.97 0.44 0.17 0.44 6.62 0.68 (n "F hr/Btu) Acoustic tile Outside Air Tur- gravel Insulation Concrete Inside air Roof Layer air space properties R 0.17 0.33 14.29 1.75 0.97 7.14 0.68 (ft "F hr/Btu) Calculate the total conduction heat loss.
PROBLEMS 1. Accumulation represents the change in mass in the reactor per change in time. For a constant-volume system, it can be simply formulated as ,dc Accumulation = V“ dt (28.1) where V = volume and e = concentration. Thus, a mathematical formulation for accu- mulation is volume times the derivative of e with respect to t. Solution. Equations (28.1) and (12.1) can be used to represent the mass balance for a single reactor such as the one shown in Fig. 28.1: dc V = Qcm - Qc (28.2) dt Accumulation = inputs – outputs Equation (28.2) can be used to determine transient or time-variable solutions for the reactor. For example, if c = co at t = 0, calculus can be employed to analytically solve G = 50 mg/m², Q = 5 m'/min, V = 100 m²., and co = 10 mg/m², Use Euler's method to find the solution of e from t = 0 to 40 s with a step size (h) of 10 s.
State true or false 1. The thermal boundary layer will be thicker than the velocity boundary layer if Pr>1. 2. For laminar flow in a tube subjected to a uniform heat flux, the fluid temperature decreases linearly along the tube. 3. Gravity force rather than buoyancy force plays a more important role in free convection. 4. Reynolds number is the ratio of the buoyancy force and viscous force. 5. The hydraulic diameter of annulus is D2-D .
1. A building exhaust fan for a large commercial bullding weighs 180 pounds and operates at a speed of 600 rpm. Due to manufacturing tolerances, it may have a rotating imbalance. It is desired to limit force transmissibility to 2.5 as the fan passes through resonance during startup and wind-down. In addition, an Isolation of 90% is required at the operating speed of the fan. The fan's framework will be supported from the floor at 4 corners. Design, select, and specify vibration isolators at the four corners. It is acceptable to assume the center of gravity is symmetrical with respect to all four corners, enabling you to treat this as a single DOF system without pitch or yaw.
Point out the similarities and differences between the pressurized water reactor (PWR) and the boiling water reactor (BVR) . Analyze the advantages and disadvantages of selecting Gas coolant over Liquid-Metal coolant in fast breeder reactor (FBR)
92. An office space of 35'x 25'x15' high. The space contains three (ó'x 2-5') poorly fitt ed doors made af nominal z? wood, and three double- huny mebal un Locked, windows, weather- stripped, (4x 4), the bottom of the lower sash is ea ch 3.5' from the floor. A temperature of 80 F at breath line when it is 10 f outside. is maintained in the space Compute the total heat,loss if, Vwin=15 mph, Uwall0.35 Btu/hr ft?. f Uroof = 0:3 B tu/ hre ft'. f , u,=1.13
Based on solar energy design and explain a cooling system that could be used in summer.
Q.2//B// Give the reasons for each of the following: 1- Why use waste heat in air conditioning system? 2- Why during winter season the temperature of supply air must be above form room condition space? 3- Why calculate the metabolic rate of the occupants? 4- Why during the sensible heating process, the relative humidity increase? 5- Why during cooling and de-humidification process involves both latent and sensible heat transfer processes? "20min"
Part b. MATLAB coding. Hot air for a large scale drying operation is to be produced by routing the air over a tube bank, while products of combustion are routed through the tubes. The surface area of the cross-flow heat exchanger is A = 25 m2, and for the proposed operating conditions, the manufacturer specifies and overall heat transfer coefficient of U = 35 W/(m2 K). The air and the combustion gases may each be assumed to have a specific heat of cp = 1040 J/(kg K). Consider conditions for which combustion gases flowing at 1 kg/s enter the heat exchanger at 800 K, while air at 5 kg/s has an inlet temperature of 300 K. (a) What are the air and gas outlet temperatures? (b) Explore the effect of changes in surface area and heat transfer coefficient on the air outlet temperature for UA values from 500 to 2500 W/K. Discuss the implications and back up the discussion with an appropriate plot
Perform a simple mass balance on the completely mixed reactor below to identify the recycled sludge concentration, X, as a -- I -- function of the recycle ratio, R, and the mixed liquor concentration, x. Draw the system control boundary across which your mass balance is performed. a. b, Set-up your mass balance equation. Make sure to clearly identify inflows, outflows, rates of growth/consumption, etc., within your system; Identify ALL assumptions; c. d. e. Solve your mass balance equation for the recycle sludge concentration; If your recycle ratio, R, is 45% and your wasting rate is 5% of the average daily flow, what is the expected recycle sludge concentration, X, with respect to the mixed liquor concentration, X? Influent Effluent Clarifier WAS RAS Completely mixed reactor system
Numerical Method Answer (in 2 decimal places) :_____min
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