storage is maintained at -5°C and the fruits get cooled to the storage temperature in 10 hours The latent heat of freezing is 105 kJ/kg and specific heat of fruit is 1.256 kJ/kg K. Find the refrigeration canacity of the plant.
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- Define the specific heat capacity with equation? How much thermal energy is required to change a 40 g ice cube from a solid at -10 oC to steam at 110 oC?8. A 110-volt electrical heater is used to warm 0.3 m3/s of water from 19°C to 98°C . Assume heat conversion loss of 25% of the total heat supplied, how much current in amperes must be supplied to this heater? draw a figure also, and explain each step by step solution.Goal Solve for the performance coefficient of a refrigerator using a five-step process the includes:1. Making a state table.2. Making a process table.3. Calculating the totals for Work, Heat, and Internal-Energy-Change.4. Identifying the heat input (cold reservoir) and output (hot reservoir).5. Calculating the performance coefficient of the refrigerator.Problem Shown in the figure to the right is a cyclic process undergone by a refrigerator. Your refrigerator shall use 5.0 moles of helium gas (monatomic). During the process a->b, the volume increases by a factor of 3.0. Solution- (1) Fill in the State Table (all pressures in Pascals, all volumes in cubic meters, all temperatures in K). Pressure Volume Temperature a b c (2) Fill in the Process Table (all entries in Joules). Work Heat dU a->b b->c c->a (3) Find the Totals: Work = J Heat = J dU = J (4) Find the heat input (from "cold…
- 10 kg of frozen chicken at an initial temperature of -20°C is to be thawed and raised to a temperature of 10°C before cooking. The freezing point of the meat is -1.7°C and the specific heats above and below the freezing point are 3.1 kJ/kg-K and 1.6 kJ/kg-K, respectively. The heat of fusion (the amount of heat needed per unit mass to thaw chicken at the freezing point) is 233 kJ/kg. Find the total amount of heat that must be transferred to complete this the process.Assume that cream has a specific heat of 2900 J/kg· ◦C and has the same heat of fusion (3.34 × 105 J/kg) and melting point as water, and that ice cream has a specific heat of 2200 J/kg· ◦C. If two kilograms of cream are initially at 10◦C, how much liquid nitrogen, which has a latent heat of vaporization of 2.00 × 105 J/kg, must be vaporized to cool, freeze, and further cool the cream to -10◦C? Assume that the liquid nitrogen is kept at 77 K, the temperature of its liquid-gas phase transition, and that the gas floats away into the room at that temperature (so no heat goes to heating up the nitrogen gas).A polished stainless steel sphere (r= 5cm) is at a temperature of 540 C. The ambier air is at 20 C. What is the instantaneous heat transfer rate?
- Determine the amount of heat removed from 1.5 kg of bologna (sausage)when cooled from 24C to -7C. Assume MC of 59% and at -7C, 22% won’t be frozen.17.Calculate the number of solar thermal collectors of 2m2 area each, required to design a solar water heater that produce a 1000 kg/day of hot water with temperature of 50oC from a cold water of temperature of 10oC, suppose the specific heat of water is 1.2 Wh/kg. K and the useful heat is 2400 Wh/m2/day:(a) An incoming stream of 1500kmol/min consists of saturated water with 65% liquid water and 35% steam at 40 bars. This steam is heated at constant pressure to 600°C. Using the steam tables, what is the heat transfer requirement for this step in kW? (Note: Steam tables in the bottom page)(b) This steam is then compressed isothermally to steam at 200 bars in a second step. What is the heat transfer requirement for this step in kW?
- A long rectangular steel bar (10cm x 5 cm) is kept in an environment such that two 10cm faces are maintained at 30 ⁰C, one 5cm face is at 30 ⁰C and other is at 130 ⁰C. The steady state temperature along the center line of the bar is ?The front door of an oven is made up of walls made up of materials A, B and C, juxtaposed. The walls that make up the door have thermal conductivities, kA= 20 W/(m.K), kB= 0.027 W/(m.K) and kC= 50 W/(m.K) and known thicknesses LA=0.30 m and LC=0.15 m. At steady state operation, measurements indicate that the air temperatures inside the oven and its inner walls are equal to 600 oC (the temperature of the inner surface of the door is not known). The convective coefficient of air (inside and outside the oven) is 25 W/(m2.K) and the radiation coefficient is hr=25 W/m2K. outside the air is at 25oC. Based on this information:(a) schematic the thermal circuit for the system;(b) estimate the minimum thickness of wall B to ensure that thetemperature of the outer surface of the door (exposed to ambient air)is ≤40oC in order to ensure the safety of operators;(c) estimate the temperature of the surface of the oven's inner wall Answer: (b) 40 mm; (c) 592.5oCWhen an ice is being heat up, it will undergo a series of thermodynamic process. Explain with a diagram that how ice will undergo latent heat of fusion, latent heat of vaporization and temperature changes under heat transfer process.