Cold salt brine at -2°C is used in a packing plant to chill food slabs from 40°C to 3.4°C in 18 hours. Determine the mass of brine required to cool 100 food slabs of 225 kg each if the final temperature of the brine is 1.7°C.

Q: For a certain gas, R=0.277 kJ/kg-K and k=1.384.   What mass of this gas would occupy a volume of…

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Q: A 10 cm diameter aluminum ball is to be heated from 94°C to an average temperature of 140°C in 30…

A: Given that ,  Diameter D=10cm Radius r=5cm T1=94°CT2=140°Ct=30min=30×60s=1800sCp=0.91kJ/kgK

Q: A mass of 1.37 kg of air in a piston-cylinder device is heated from 20.6°C to 250.1°C. During the…

A: Data given-  m = 1.37 kg  P = 111.04 kPa  T1 = 20.6 + 273.15 = 293.75 K T2 = 250.1 + 273.15 = 523.15…

Q: change in molar specific enthalpy

A: Given; Determine chnage in molar specific enthalpy ?Where, Molar specific heat at constant volume of…

Q: An iron block cools down from 200°C to the room temperature of 27°C, when outdoor is 5°C, heating…

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Q: Figure 1 shows a piston-cylinder device. Initially it is filled with the volume of 0.334713 m³…

A: Initial specific volume at the temperature of 100oC. v1=n1×vg=0.4×1.672=0.6688 m3/kg Final specific…

Q: Initially, a rigid tank contains 500L of water at 300°C. By volume, the tank contains60% liquid and…

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Q: A Covid-19 patient whose weight is 65 kg has a body temperature of 38°C due to the ever caused by…

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Q: A brick wall, 225 mm thick and having a thermal conductivity of 0.60 WI(m K), measures 10 m long by…

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Q: Consider a glass of ice water at 0 °C. Moisture from the air is observed to condense on the outer…

A: To find: The mass of ice melt. Given: The mass of water condensed is mw=6.6 g1 kg1000 g=0.0066 kg.…

Q: 0.5 kg of superheated steam (2bar and 200°C is compressed isothermally until it becomes saturated…

A: Mass of steam = 0.5 kg Superheated state = 2 bar, 200°C

Q: Before the widespread use of mechanical refrigeration, cooling was provided by ice, which was…

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Q: An insulated container is partly filled with oil. The lid of the container is removed, 0.107 kg of…

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Q: A frictionless piston-cylinder device initially contains 200L of saturated liquid refrigerant-134a.…

A: 1. Given, V1=200LP1=P2=900KPaT2=70°CFrom the steam table Properties of refrigerant R-134a at…

Q: 0.05 kg of steam at 5 bar is contained in a rigid vessel of volume 0.0076m³. What is the temperature…

A: Given:m=0.05 KgP=5 barV=0.0076 m3From steam table at P=5 bar:Tsat=424.986 KLatent heat, L.H.=2107.92…

Q: Determine the heat energy required to convert 20 kg of water at 30°C completely to steam at 120°C,…

A: Let's solve the proble step by step as explained in next step.

Q: 2.33-kg of saturated liquid at 180°C is contained in a closed, rigid container. The tank is heated…

A: Given  M= 2.33kg T= 180°c = 453k From first law of thermodynamics  Q= U+W W=0 ( rigid tank volume…

Q: ) The properties of air at the exit of the cooling coil, -) Cooling coil load.

A: Given: V= 1.5 cmm =1.5 m3/min DBT=28oC WBT=20oC Sensible cooling to 16oC To determine: The…

Q: Determine the final temperature of 0.8kg of glass with heat capacity of C = 0.092 cal/g°k and…

A: Given data as per the question mass of glass= 0.8 kgheat capecity of glass=0.092 cal/g.k=385…

Q: A mass of ice at -7 C is needed to cool 224 kg of vegetables (Cp = 3.35 KJ /kg.K )in  a bunker for…

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Q: How many grams of coffee must evaporate from 800 g of coffee in a 180 g glass cup to cool the coffee…

A: Given data: The mass of coffee in the cup is, mc = 800 g. The mass of cup, mg = 180 g. The initial…

Q: A rigid container with a volume of 2000 liters contains 4 kg mixture of saturated water and steam at…

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Q: For a certain gas, R=0.277 kJ/kg-K and k=1.384.   What mass of this gas would occupy a volume of…

A: Given Data V=0.475 m3 P=518.14 kPa T=27.8°C=300.8 K R=0.277 kJ/kg-K

Q: magine that we have a sample of nitrogen gas confined to a cylinder by a movable piston. The…

A: The given question includes three processes which are- Process 1-2: Adiabatic compression of the gas…

Q: In an experimental determination of specific heat capacity of air at constant pressure, 50 gm of air…

A: We have, m=50 gm=50×10-3 kgt1=14°C,t2=74°Cγ=CpCv=1.4

Q: Consider a 1.36-kg solid spherical aluminum with a cylindrical hole. It is supported by an…

A: Given: Mass of the aluminum sphere is 1.36 kg. The temperature of the cylinder is  235°C. Mass of…

Q: ne hundred fifty kilograms of Fish-Cod is to be cooled from 0°c to -10°c. Using enthalpy relations,…

A: Given, mass of fish cod= 150 kg Temperatures cooled from 10 degrees C to - 10 degrees C

Q: For bacteriological testing of water supplies and in medical clinics, samples must routinely be…

A: (a) The heat is taken as Q that is used to fuse the wax. So, the mass of wax is written as There…

Q: A 166 g block of ice is cooled to -78°C and is then added to 500 g of water in an 80 g copper…

A: Write the values of specific heats of water, ice, and copper and the latent heat of fusion of ice…

Q: heat. of 0.8 k

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Q: mass of ice at -4°C is needed to cool 115 kg of vegetables in a bunker for 24 hours. The initial…

A: Given                           Mass, m = 115 kg       Specific heat of water = 4.22 kJ/kg.K…

Q: A 0.2-m³ rigid tank is filled with saturated liquid water at 340°C. A valve at the bottom of the…

A: GivenV=0.2 m3T1=340oCmout=50% m1

Q: A rigid tank contains 2kg of saturated water vapor mixture at temperature of 50 degrees C and…

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Q: Steam at 100°C is used to warm 350 g of water contained in a 300 g aluminum container.  The initial…

A: The mass of the steam.Given:The mass of the water is .The mass of the aluminum is .The initial…

Q: What is the underlying mechanism for the observed deviation from ideality in non-ideal solutions,…

A: This question is based on the thermodynamic properties.

Q: Stainless steel ball bearings (p = 8085 kg/m³ and cp = 0.480kJ/(kg °C)) having a diameter of 1.5 cm…

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Q: A piece of steel of mass 0.9 kg has a temperature of 95°C. It is immersed in a copper calorimeter…

A: Given data: Mass of steel  = 0.9 kg Initial temperature of steel = 95°C Specific heat capacity of…

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.