KNOWN: Thickness of basement wall. Inner and outer wall temperatures. Thermal conductivity of aerated concrete. FIND: Thickness of polystyrene insulation needed to reduce heat flux through the stone mix concrete wall to that of the aerated concrete wall. Lost annual rental income associated with specification of the stone mix concrete wall. SCHEMATIC: To=0°C T₁ = 20°C Aerated concrete L = 200 mm L = 200 mm To q" q" T₁ Polystyrene Stone mix concrete

KNOWN: Thickness of basement wall. Inner and outer wall temperatures. Thermal conductivity of aerated concrete. FIND: Thickness of polystyrene insulation needed to reduce heat flux through the stone mix concrete wall to that of the aerated concrete wall. Lost annual rental income associated with specification of the stone mix concrete wall. SCHEMATIC: To=0°C T₁ = 20°C Aerated concrete L = 200 mm L = 200 mm To q" q" T₁ Polystyrene Stone mix concrete

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.74P: A manufacturer in the United States wants to sell a refrigeration system to a customer in Germany....

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8
Q1. Find the heat flow rate through the composite wall as shown in Fig. bele Assume one dimensional flow & the area is variable for each layer. Where: 60°C kA = 152 W/m°C, kB = 31 W/m°C, %3D 3 cm kC = 68 W/m°C and 7 cm %3D kD = 53 W/m °C. 400°C A 10 cm 5 cm 8 cm 3 cm D. BC
2. Calculate the heat loss for the structure described below. Use the indoor design setpoint of 70°F. ● . . . ● ● Hint: Utilize the Q=U*A*(ti-to) & Q = U'*P*(ti-to). Make sure to reference the following tables and examples to help assist you solve this problem; Table 5-5a, Table 5-8, Table 5-4a, Example 5-3, Eq. 5-23, and Fig 5-8. Given: i. Location: Des Moines, IA @ 99% winter OAT ii. Walls: Table 5.7, Construction 2 iii. Floor: Concrete slab with 2-ft, R-5.4, vertical edge insulation iv. Windows: Double-Insulating Glass; 1/4-in. air space; e = 0.6 on surface 2, 3x4-ft, double hung, reinforced vinyl frame; three on each side v. vi. Roof-Ceiling: Same as Example 5.3, height of 8-ft vii. House Plan: Single story, 36-ft x 64-ft Doors: Wood, 1-3/4-in. panel doors with metal storm doors, three each, 3x6.75-ft Qwindows = Qdoors= Qwalls = Qroof/ceiling= Qfloor = QTOTAL = Btu/(hroft²0F) Btu/h Heat Loss Btu/h Heat Loss Btu/h Heat Loss Btu/h Heat Loss Btu/h Heat Loss
1
Solve correctly please. Water with a bulk temperature of 70 F flows through a 2-inch chart 80 steel pipe. The temperature of the steam condensing outside the pipe is 210 F and the heat transfer rate is 1600 Btu/h F Rr. If the heat transfer coefficient of the current flowing through the pipe is 400 Btu/hr F, calculate the heat transfer rate in kW for 1 m of pipe. (Gpt/ ai wrong answer not allowed)
A 1 cubic meter of water inside a one kg ahminum container is heated from 20°C to 30°C. Find the heat supplied to the system if CA1 = 0.22 cal / gm Note: Assume that there is no heat loss and temperature of water is always equal to the temperature of ahuminum container. а. 20,002,200 cal b. 10,002,200 cal °C. c. 30,002,200 cal d. 40,002,200 cal
A composite wall is made up of 10 cm of common brick against 15cm of concrete with 1.5 cm of plaster on inside of wall. Assume still air in room at 25 °C. The outside air at 40 °C the wind velocity is 25 km/hr. Note: Use standard tables for values of thermal conductivities and film co-efficient. Find: a) The thermal resistance of wall b) The overall heat transfer cop-efficient. c) The steady state heat transfer rate per unit area of wall d) Heat transfer if the outside and inside film resistances are disgraded
An office space of 12 ft x12 ft x10 ft height. The heat loss through roof is (4780.8 Btuh) if Tb.l.=80 F, To= 5 F, and Uroof=D0.4 Btu/hr.ft2.F * O True O False
Find the amount of heat lost per hour through a square foot ofbuilding wall composed of 18-in. sandstone and 3/4-in. metal lath andplaster separated by a 1 1/4-in. air space, when the temperature of theroom is 70 °F, the outdoors is 10 °F, and the wind velocity is 15 mph.
Solve correctly all subparts please. (Gpt/Ai answer not allowed)
Number 16.
Requirements: 1. Fill the tables. 2. Calculate the thermal conductivity and the thermal resistance. Comment on results. 3. Plot the measured values for temperature difference over the electrical power. please don't reject the question. Thank you