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] :
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
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe801909c-59c9-4b6d-8f92-02e1e3a7b70b%2Fafe85f1d-89ea-4da0-9341-cdae1354fa5a%2F0pyfe3q_processed.png&w=3840&q=75)
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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