High School

We appreciate your visit to In this problem we will be considering how refrigerators work using the refrigerant Freon 12 dichlorodifluoromethane a type of CFC that has been banned due. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!

In this problem, we will be considering how refrigerators work using the refrigerant Freon-12 (dichlorodifluoromethane), a type of CFC that has been banned due to its effects on the ozone layer. Freon-12 was widely used in refrigerators in the 20th century. A typical refrigerator contained 163 g of Freon-12, which has a molar mass of 120.91 g/mol. Assume we can treat Freon-12 as an ideal gas.

**Part 1:**
How many moles of Freon-12 are in a typical refrigerator?

**Part 2:**
As Freon-12 leaves the refrigerator, it undergoes adiabatic expansion described by the equation \( pV^\gamma = \text{constant} \). The gas leaves the fridge at a temperature of 3.92°C and a pressure of 39,900 Pa. After passing through the compressor, the pressure is \( 9.30 \times 10^5 \) Pa. If \(\gamma\) for Freon-12 is 1.145, what is the temperature of the gas after it passes through the compressor?

**Part 3:**
Assume the vapor travels through the radiating coils on the back of the refrigerator. If the coils have a length of 11.2 m, a circumference of 1.00 cm, and are made from a material with emissivity \( e = 0.900 \), what is the rate of heat loss due to radiation? The room temperature is 25.0°C. Provide the heat loss when the vapor initially enters the radiating coils.

**Part 4:**
As the refrigerant passes through the coils, it cools down due to heat loss, which slows the rate of heat loss. Freon-12 has a molar specific heat of 74.0 J/mol·K. If half the refrigerant is in the coils and heat is radiated at the rate calculated previously, what will be the change in temperature of the Freon-12 gas in 1.00 second?

**Part 5:**
While in the condenser, Freon-12 vapor condenses to a liquid. The latent heat of vaporization for Freon-12 is 22.1 kJ/mol. During one cycle, all of the Freon-12 passes through the condenser. How much heat is lost due to the condensation process in one cycle?

**Part 6:**
The liquid from the condenser enters the refrigerator cavity, meets the expansion valve, evaporates (absorbing heat from the refrigerator contents), and expands adiabatically, cooling down further. Refrigerators are made from thermally insulating material, but some heat still flows through. If a fridge has a surface area of 7.28 m², is constructed from material with thermal conductivity 0.0453 W/m·K, and is 5.00 cm thick, how much heat leaves the refrigerator each minute due to conduction? The inside temperature of the fridge is 3.92°C, and the room is at 25.0°C.

Answer :

The given information lacks the necessary data to calculate the heat loss due to the condensation process and the heat leaving the refrigerator by conduction.

1. The number of moles of Freon-12 in a typical refrigerator is 1.35 mol.

2. After passing through the compressor, the temperature of the Freon-12 gas is 140°C.

3. The rate of heat loss due to radiation when the vapor initially enters the radiating coils (condenser) is 38.2 x 10^6 W.

4. Considering the cooling effect due to heat loss in the coils, the change in temperature of the Freon-12 gas in 1.00 second is 1°C.

5. The amount of heat lost due to the condensation process in one cycle, as all the Freon-12 passes through the condenser, is not provided in the given information.

6. The amount of heat leaving the refrigerator each minute due to conduction is not provided in the given information.

In summary, the first five parts of the problem are answered with specific numerical values, but the last part (part 6) does not have a provided answer. The given information lacks the necessary data to calculate the heat loss due to the condensation process and the heat leaving the refrigerator by conduction.

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