EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
9th Edition
ISBN: 9781119321453
Author: Sonntag
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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An ammonia compressor of an ice plant is driven by 175 kW electric motor. The belt
transmission efficiency is 94.5% while the mechanical efficiency of the compressor is 85%.
The water used in making ice is supplied to the 300-lb block ice per can at 18OC
temperature and ice leaves the plant at -6.5OC. The coefficient of performance is 2.0.
Heat losses conducted into the brine are 15% of the chilling and freezing load.
Calculate:
a) The refrigeration capacity
b) The ice plant capacity
c) The number of ice cans needed if brine temperature is -7.50OC.
Note : Use the relevant chart for each problem
3. A vapour compression refrigerator uses R-12 as refrigerant and the liquid evaporates in
the evaporator at - 15 °C. The temperature of this refrigerant at the delivery from the
compressor is 15°C when the vapour is condensed at 10°C. Find the coefficient of
performance if (i) there is no undercooling , and (ii) the liquid is cooled by 5°C before
expansion by throttling.
Take specific heat at constant pressure for the superheated vapour as 0.64 kJ/kg.K and for
liquid as 0.94 kJ/kg.K. (Same as Example 12)
Please solve the question on a piece of paper and using tables with illustrations
The coefficient of performance (COP) for a vapor compression cycle chiller is 8.7. If the chiller can produce 58 tons of cooling. If the chiller operates for a total of 3568 hours annually, and the cost of electricity is $0.15 per kWh, how much does it cost to operate the chiller?
Fill in the operating cost of the chiller in one year in $.
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- In the following setup, heat engineoutput is utilized to run a refrigeration cycle.(a) Calculate QL1, (b) Is the heat enginereversible, irreversible or impossible? (Brieflyexplain), (c) Calculate QH2, and (d) Is therefrigeration cycle reversible, irreversible orimpossible? (Briefly explain). Clearly explaineach step!arrow_forward3. An ice plant produces 10 tonnes of ice per day at 0°C, using water at room temperature of 20°C. Estimate the power rating of the compressor motor if the C.O.P. of the plant is 2.5 and overall electromechanical efficiency is 0.9. Take latent heat of freezing for water = 335 kJ/kg Specific heat of water = 4.18 kJ/kg. [Ans. 21.44 kWIarrow_forwardRefrigeration Engineering. What is the rate of refrigeration in kW of an ideal heat-operated refrigeration cycle that receives the energizing heat at a rate of 1 kW from a solar collector at a temperature of 70 K, perform refrigeration at 15 K, and rejects heat to atmosphere at a temperature of 35 K?arrow_forward
- (4 blanks) An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 oC and rejects heat to a room at 24.0 oC. Suppose that 85.0 kg of water at 0.0 oC are converted to ice at 0.0 oC. How much energy (in Joules) must be supplied to the machine to achieve this task?arrow_forwardi need the answer quicklyarrow_forwardA refrigeration unit utilises ammonia as the refrigerant. The diagram for the circuit isshown in Figure Q3 below, with the following conditions: point (1) is a saturated liquidat –30 oC, points (3), (4) and (7) is a saturated liquid at 10 oC and point (5) is a saturatedvapour at –30 oC. The isentropic efficiency of the compressor and pump is 80% and itis assumed there are negligible heat losses to the surroundings. The liquid ammoniahas a specific volume of 0.0015 m3 kg-1. (a) Discuss which factors must be considered when selecting an appropriate refrigerant?(b) Calculate the coefficient of performance (COP) of the cycle.(c) If the effect of refrigeration is 10 kW, determine the required mass flow rate.arrow_forward
- Will the COP of a refrigeration unit likely be larger when it chills room-temperature air to 3°C (as in your kitchen’s refrigerator) or when it chills room-temperature air to -18°C (as in your kitchen’s freezer)arrow_forwardExplain the terms - thermo - property - state - process - cyclearrow_forwardI need answer in handwrittenarrow_forward
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