A refrigeration unit maintains the interior temperature of a walk-in meat locker at a temperature of – 5°C. The rate of heat transfer to the locker from the outside air is 8000 kJ/hr. The air outside the locker is at 22°C. The coefficient of performance [COP] for the actual refrigeration unit is 2.5 to maintain the locker temperature. Assume [3]: Max [TH,Tc] : BMax [TH,Tc] : YMax [TH,Tc] :

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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**Refrigeration Cycle Analysis**

A refrigeration unit maintains the interior temperature of a walk-in meat locker at a temperature of –5°C. The rate of heat transfer to the locker from the outside air is 8000 kJ/hr. The air outside the locker is at 22°C. The coefficient of performance (COP) for the actual refrigeration unit is 2.5 to maintain the locker temperature. 

**Assumptions:**

\[
\begin{align*}
\eta_{\text{Max}}[T_H, T_C] &= \\
\beta_{\text{Max}}[T_H, T_C] &= \\
\gamma_{\text{Max}}[T_H, T_C] &= \\
\end{align*}
\]

**Multiple Choice Questions:**

1. **The maximum coefficient of performance (COP) for the refrigeration cycle is equal to:**
   - a. 2.50
   - b. 9.93
   - c. 10.93
   - d. none of the above

2. **The heat transfer to the locker from the outside air to the locker is equal to:**
   - a. \(Q_{\text{Net}}\)
   - b. \(Q_c\)
   - c. \(Q_H\)
   - d. none of the above

3. **The required power input \(W_{\text{Actual}}\) for the cycle in kJ/hr is:**
   - a. 3,200
   - b. 8,000
   - c. 20,000
   - d. none of the above

4. **The minimum power input \(W_{\text{Min}}\) for the cycle in kJ/hr is:**
   - a. 730
   - b. 805
   - c. 3200
   - d. none of the above

5. **The required power input \(W_{\text{Actual}}\) for a cycle with a COP of 5 in kJ/hr is:**
   - a. 1,600
   - b. 4,000
   - c. 10,000
   - d. none of the above

**Explanations:**

- This material discusses the thermal dynamics involved in refrigeration cycles, particularly emphasizing the mechanics of heat transfer and energy efficiency.
- Assumptions for maximum efficiencies are presented
Transcribed Image Text:**Refrigeration Cycle Analysis** A refrigeration unit maintains the interior temperature of a walk-in meat locker at a temperature of –5°C. The rate of heat transfer to the locker from the outside air is 8000 kJ/hr. The air outside the locker is at 22°C. The coefficient of performance (COP) for the actual refrigeration unit is 2.5 to maintain the locker temperature. **Assumptions:** \[ \begin{align*} \eta_{\text{Max}}[T_H, T_C] &= \\ \beta_{\text{Max}}[T_H, T_C] &= \\ \gamma_{\text{Max}}[T_H, T_C] &= \\ \end{align*} \] **Multiple Choice Questions:** 1. **The maximum coefficient of performance (COP) for the refrigeration cycle is equal to:** - a. 2.50 - b. 9.93 - c. 10.93 - d. none of the above 2. **The heat transfer to the locker from the outside air to the locker is equal to:** - a. \(Q_{\text{Net}}\) - b. \(Q_c\) - c. \(Q_H\) - d. none of the above 3. **The required power input \(W_{\text{Actual}}\) for the cycle in kJ/hr is:** - a. 3,200 - b. 8,000 - c. 20,000 - d. none of the above 4. **The minimum power input \(W_{\text{Min}}\) for the cycle in kJ/hr is:** - a. 730 - b. 805 - c. 3200 - d. none of the above 5. **The required power input \(W_{\text{Actual}}\) for a cycle with a COP of 5 in kJ/hr is:** - a. 1,600 - b. 4,000 - c. 10,000 - d. none of the above **Explanations:** - This material discusses the thermal dynamics involved in refrigeration cycles, particularly emphasizing the mechanics of heat transfer and energy efficiency. - Assumptions for maximum efficiencies are presented
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