Answered: An office space of 12 ft x12 ft x10 ft…

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%3D0.4 Btu/hr.ft2.F * O True O False

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter42: Heat Gains And Heat Losses In Structures

Section: Chapter Questions

Problem 7RQ: The typical indoor design temperature used for heat loss calculations is A. 65F. B. 70F. C. 75F. D....

See similar textbooks

Related questions

Q: Sheet -2- QI/ Complete the following table for water NO T kpa p m/kg phase 125 0.53 2 1000…

Q: Q1. Find the heat flow rate through the composite wall as shown in Fig. below. Assume one…

A: Given: The Thermal conductivity of layer A, KA = 152 W/moC The Thermal conductivity of layer B, KB =…

Q: The minimum force P in KN should be applied to keep the gate closed, A= 9m² , I= 6.75 m is 132.3

A: Surface Area of gate, A= 9m2Moment of inertia of gate, I = 6.75 m4γ= 9800 N/m3

Q: Question: Consider the following thermal system. The input is T in, and the output is the…

A: Given : To find : State space model

Q: An office space of 15 ft x12 ft x10 ft height. The heat loss through roof is (8820 Btuh) if Tb.l.=80…

Q: t-lb 7. One pound of air R = 53.3 is compressed isothermally in a closed system from 15 psia and…

Q: H.w.: As shown in figure below, determine the pressurt at point A. H9 Ans. : (2.164 Kfa Vacuum Water…

A: This is a classical problem of pressure difference across two ends of the tube. It can be calculated…

Q: Q. In a belt transmission dynamometer, the distance between the center of driving pulley and the…

A: The answer is given below

Q: 14. When an individual is in water, the convective heat loss term is grea:ty increased. For water…

A: Given, Kc=16.5 kcal/m2hr°C. Water heat loss, Q˙=72kcal/hr Effective area, Ac=1.75m2 Temperature of…

Q: 2 m Steam T-80 C m-0.3 kg/s X-0.9 P1-0.1bar P2-0.8 bar D-20mm (hin) Water Water T-20 C Water…

A: Given data To determine What is the condenser pressure in [bar]Determine the air pressure inside…

Q: Air flows through a 10- inside diameter tube, at an average temperature condition of 300'F. The…

Q: The specific internal energy of water at 10 psia and 220 °F is Btu/lbm. Numeric Response

A: Given: To determine specific internal energy of water.

Q: b. One thousand cfm of outdoor air enters a building in Riyadh on very cold day. The indoor air…

A: given; mass(m)=1000cfmdry bulb temperature (db)=720FRh=40%outdoor RH=99.6%loss of latent heat(LH)=??

Q: W=1900.N/m 4450 2.2 1.5m

Q: VII- can be employing to measuring flow rate at a fixed temperature. a) Rotameter b) Orometer e)…

A: It is required to choose correct answer

Q: 19.12 A certain double-pane window consists of two glass sheets, each 80 cт х 80 ст х 0.30 ст,…

A: The heat passes through the window each second is Q = 69 cal/sec.

Q: XIV- NTC and PTC are where the first with negative and second one with positive coefficient. a)…

A: Problem is based on basic electrical and can be solved as

Q: A closed vessel contains water up to a height of 2 m and over the water surface there is air having…

Q: Convert each temperature. 0.00 K to °F (coldest temperature possible, also known as absolute zero)

A: Given: The temperature is T1=0.00 K. The expression to convert the temperature from Kelvin into…

Q: Q1. Find the heat flow rate through the composite wall as shown in Fig. bele Assume one dimensional…

A: Given Data KA=152 W/m°C KB=31W/m°C KC=68 W/m°C KD=53 W/m°C Now LA=3 cm=0.03 mLB=LC=8 cm=0.08…

Q: (e) 1740 psf to Pa and kPa (f) 2.8 kips/ft? to kPa (g) 247 pcf to kN/m³ 3

A: a) convert psf to pa and kpa. b) convert kips/ft^3 to kpa c) convert pcf to KN/m^3

Q: Suppose a person with skin area 1.5 m and daily food intake of 2.63 x 10° kcal has skin temperature…

A: Given data Skin area (A) = 1.5 m2 daily food intake (E) = 2.63*103 kcal…

Q: The rate of heat transferred between air and condensing refrigerant in a condenser is 70 kW. The…

Q: A 10 ft vessel contains a gas with an absolute pressure of 2102.893 kPa. An outside work is added to…

A: Given:volume of vessel, V=10 ft3=0.283168 m3initial pressure of gas, P1=2102.893 kPa final pressure…

Q: Q1. Find the heat flow rate through the composite wall as shown in Fig. below. Assume one…

A: Given: The width of each layer, b = 10 cm The thermal conductivity of layer A, KA = 152 W/moC The…

Q: A 3,500-seat auditorium is to be air-conditioned using window units 10 kW nominal value. Assume that…

Q: Qi: (50 marks) Find the total heat flux of the composite wall when: KA = KC = KF = 15 m. K KB = KD =…

Q: Q2: Find the cooling load of a barber shop due to infiltration and ventilation. The inside…

A: Given data Inside room outside room DBT=24°C DBT=48°C Relative humidity =50% Relative…

Q: PC are:- E, = 140J/kg K pr = 0.0248

Q: Tesistal 2h If you include air resistance, then vs0 will appear and the equation dv m –mg + kv² v(0)…

A: You have asked a multipart question. Here t= time V = velocity h = height of apple from ground

Q: An air-cooled condenser has an h value of 30 W/m2-K based on the air-side area. The air-side heat…

Q: Q1: the pressure at point A is 172 pa. All fluids are at 20°C. The air pressure in the closed…

A: For the given arrangement The pressure at A = 172 Pa the specific weight of water (ω) = 9790 N/m3…

Q: 7. Determine the heat loss through a ventilated attic under the following conditions: indoor…

Q: nit of thermal conductivity in S.I. units is (A) J/m² sec

A: Given: Thermal conductivity

Q: Solve for Q in Watts. The dimension of the wall into the page is 24 mm and the temperature…

Q: 2. An unknown gas (with PVT conditions of; 101 kPa, 2.83 m & 23°C) is to be transferred into a…

Q: How much will an air leak cost during three monthes? the hole has a diameter 6.35mm at line pressure…

A: Given that , Air leak time T=3 month Hole diameter D=6.35 mmLine pressure P=690kPaElectricity cost…

Q: An office space of 15 ft x12 ft x10 ft height. The heat loss through walls is (6949.8 Btuh) if…

A: An office space of 15 ft x12 ft x10 ft height. The heat loss through walls is (6949.8 Btuh) if…

Q: A retrofitted space-heating system is being considered for a small office building. The system can…

A: In a cost-benefit analysis, a benefit-cost ratio (BCR) is a ratio that summarises the overall…

Q: Q2 Show if the following statements are (true) or (false) :/ 1- The value of thermal conductivity…

A: Dear student, According to the guidelines I am allowed to answer only three…

Q: A thick-walled cylinder with closed ends is subjected to internal pressure p; and external pressure…

A: The data from the question has been provided to us are: a=0.6 m,b=1 m,σall=140 MPa=140×106…

Q: Temperature differences for Thermal efficiencies do not have to be converted to absolute…

A: If the thermal efficiencies of a cycle is expressed in terms of temperature difference, then it is…

Q: bläs 3 Determine the air pressure in\ the sealed left tank if EA = N+39 m, where N is your…

Q: Hot Reservoir HE 1 HE 2 Он e QL Cold Reservoir W₁ net,out, 1 W₁ net,out, 2 Let's calculate for the…

Q: A closed vessel contains air at a pressure of 140 kPag and temperature of 20oC. Find the final gauge…

A: Given Data The initial pressure is: P1=140 kPa The initial temperature is: T1=20°C The final…

Q: Perform the following temperature unit conversions: (a) Convert a temperature of 52°C to °F. °R, and…

Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

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%3D0.4 Btu/hr.ft2.F *
True
False

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1 Given Data

VIEW

Step 2 Calculation

VIEW

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

The typical indoor design temperature used for heat loss calculations is A. 65F. B. 70F. C. 75F. D. 80F.
A manufacturer in the United States wants to sell a refrigeration system to a customer in Germany. The standard measure of refrigeration capacity used in the United States is the ton (T); a 1 T capacity means that the unit is capable of making about 1 T of ice per day or has a heat removal rate of 12,00 Btu/h. The capacity of the American system is to be guaranteed at 3 T. What is this guarantee in SI units?
An office space of 15 ft x12 ft x10 ft height. The heat loss through roof is (8820 Btuh) if Tb.l.=80 F , To= -10 F , and Uroof=0.5 Btu/hr.ft2.F ? True or false
An office space of 15 ft x12 ft x10 ft height. The heat loss through walls is (6949.8 Btuh) if Tb.l.=80 F , To= -10 F , and Uwall=0.143 Btu/hr.ft2.F ? True or false
The rate of heat transferred between air and condensing refrigerant in a condenser is 70 kW. The condenser has an air-side area of 210 m2 and a U value based on this area of 0.037 kW/m2 -oC. It is supplied with 6.6 m3/s of air which has a density of 1.15 kgm/m3. If the condensing temperature is 55 oC, Determine the temperature of inlet air. (for decimal places for final answer)
An air-cooled condenser has an expected U value of 30 W/m2∙K based on the airside. The condenser is to transfer 60 kW with an airflow rate of 15 kg/s entering at 35°C. If the condensing temperature is to be 48°C, what is the required airside area in m2? Round your answer to 2 decimal places. heat transfer
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.
Q.5 A petrol engine with 6 cylinder of 82.55 mm bore and 79.5 mm stroke delevers 48 kW.If the compression ratio is 7.8 , mechanical efficiency is 80% and thermal efficiency is 21.1%, determine a)Total swept volume in cubic cm b) Clearance volume of each cylinder c)Indicaed power d)Friction power e)Indicated thermal efficiency
An air-cooled condenser has an expected U value of 30 W/m2∙K based on the airside. The condenser is to transfer 60 kW with an airflow rate of 15 kg/s entering at 35°C. If the condensing temperature is to be 48°C, what is the required airside area in m2? Round your answer to 2 decimal places.
A retrofitted space-heating system is being considered for a small office building. The system can be purchased and installed for $120,000, and it will save an estimated 300,000 kilowatt-hours (kWh) of electric power each year over a seven-year period. A kilowatt-hour of electricity costs $0.120, and the company uses a MARR of 15% per year in its economic evaluations of refurbished systems. The market value of the system will be $8,200 at the end of seven years, and additional annual operating and maintenance expenses are negligible. Use the benefit–cost method to make a recommendation.
An office heater puts out 2090 Btu (British thermal units) of energy in the form of heat per hour. Given that 1 Btu=1.055 kJ,how many megajoules of energy in the form of heat can be produced per year (365 days) by the heater, assuming continuous operation?
A particular frost-free refrigerator uses about 745 kWh of electrical energy per year. Express this amount of energy in unit cal.