Suppose you want to operate an ideal refrigerator with a cold temperature of −20°C, and you would like it to have a coefficient of performance of 5.55. What is the hot reservoir temperature (in °C) for such a refrigerator?
Suppose you want to operate an ideal refrigerator with a cold temperature of −20°C, and you...
Suppose you want to operate an ideal refrigerator with a cold temperature of -20 degree C, and you would like it to have a coefficient of performance of 6.50. What is the hot reservoir temperature for such a refrigerator? degree C
Suppose you want to operate an ideal refrigerator that has a cold temperature of -11°C, and you would like it to have a coefficient of performance of 8.5. What is the temperature, in degrees Celsius, of the hot reservoir for such a refrigerator?
A Carnot refrigerator has a coefficient of performance of KC=4. If the temperature of the hot reservoir is TH=400K, what is the temperature of the cold temperature reservoir, TC?
A real refrigerator works between two temperature reservoirs, one at 277 Kelvin, and one at 345 Kelvin. In order to maintain a constant heat flow, during one cycle 350 Joules of heat is transferred from the cold reservoir, while the net work in one cycle is 500 Joules. (a) Obtain the coefficient of performance for this refrigerator. (b) Compare the result in (a) with the ideal case. That is, what is the maximum coefficient of performance if this was an...
Second Law of Thermodynamics Learning Goal: To understand the implications of the second law of thermodynamics. The second law of thermodynamics explains the direction in which the thermodynamic processes tend to go. That is, it limits the types of final states of the system that naturally evolve from a given initial state. The second law has many practical applications. For example it explains the limits of efficiency for heat engines and refrigerators. To develop a better understanding of this law,...
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. isothermal Problem Shown in the figure to the right is a cyclic process undergone by a refrigerator. Your refrigerator shall use 8.0 moles of helium gas...
A)How much mechanical work is required to operate the refrigerator for a cycle? B)How much heat does the refrigerator discard to the high-temperature reservoir during each cycle? A refrigerator with a coefficient of performance of 1.77 absorbs 3.64x104 J of heat from the low- temperature reservoir during each cycle.
Imagine you have a hot reservoir at a temperature of 89.0 °C, and cold reservoir at a temperature of 15.0 °C. Given their vast size, it is reasonable to assume the reservoirs\' temperatures will not change significantly if heat flows into or out of them. These reservoirs are then brought into thermal contact, during which 39210 J of heat flows from the hot reservoir to the cold reservoir. As a result of this heat exchange, what is the total change...
Exercise 4 In the ideal vapour-compression refrigerator using refrigerant 134a, the evaporator temperature is -20 C, and the inlet temperatu enters the compressor. Calculate: re to the condenser is 30°C. Saturated vapour a. The work of the compressor b. The heat transfer from the condenser c. The heat transfer to the evaporator d. The coefficient of performance
Paragraph Styles 1) Steam engines operate between a cold temperature reservoir at 30°0c and a hot temperature reservoir at 565°C. a. What is their maximum possible efficiency? b. A steam locomotive is an example of steam engine. The real efficiency of these locomotives was about 8%. Can you list a number of causes that bring the efficiency down so dramatically?