The published technical information is shown below for TempStar air conditioners. Rating is provided for an outside air temperature of 95°F and an inside temperature of 80°F. For the model N4A318AKA:a.What is the COP [1.96]b.What is COP Carnot [36.0] Nominal Min. Circuit Max. FuseAmpacity or BreakerOperating Dimensionsheight x width x depth (in)Ship / OperatingWeight (Ibs)138/117ModelSizeNumber(tons) BTU/hrN4A318AKA18,00011.71525 x 25% x 26%618GKAsame model with 3/8" spacing inlet grilleN4A324AKA24,00017.62525 x 25% x 26%6143 / 12224GKAsame model with 3/8" spacing inlet grilleN4A330AKB30,00016.82525 x 25% x 26%148 / 12730GKBsame model with 3/8" spacing inlet grilleN4A336AKA36,00019.030354 x 25% x 2616174 / 151336GKAsame model with 3/8" spacing inlet grilleN4A342AKA42,00023.54032%6 x 31% x 32%208 / 18042GKAsame model with 3/8" spacing inlet grilleN4A348AKA26.239% x 31%s x 32%6225 / 197448,0004048GKAsame model with 3/8" spacing inlet grilleN4A360AKB60,00034.25035% x 35 x 35%6240 / 20660GKBsame model with 3/8" spacing inlet grille

Given: The outside temperature is To=95oF= (95oF+460.67)=554.67 R. The inside temperature is…

Answered: The published technical information is…

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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Question

The published technical information is shown below for TempStar air conditioners. Rating is provided for an outside air temperature of 95°F and an inside temperature of 80°F. For the model N4A318AKA:

a.What is the COP [1.96]

b.What is COP Carnot [36.0]

Nominal Min. Circuit Max. Fuse
Ampacity or Breaker
Operating Dimensions
height x width x depth (in)
Ship / Operating
Weight (Ibs)
138/117
Model
Size
Number
(tons) BTU/hr
N4A318AKA
18,000
11.7
15
25 x 25% x 26%6
18GKA
same model with 3/8" spacing inlet grille
N4A324AKA
24,000
17.6
25
25 x 25% x 26%6
143 / 122
24GKA
same model with 3/8" spacing inlet grille
N4A330AKB
30,000
16.8
25
25 x 25% x 26%
148 / 127
30GKB
same model with 3/8" spacing inlet grille
N4A336AKA
36,000
19.0
30
354 x 25% x 2616
174 / 151
3
36GKA
same model with 3/8" spacing inlet grille
N4A342AKA
42,000
23.5
40
32%6 x 31% x 32%
208 / 180
42GKA
same model with 3/8" spacing inlet grille
N4A348AKA
26.2
39% x 31%s x 32%6
225 / 197
4
48,000
40
48GKA
same model with 3/8" spacing inlet grille
N4A360AKB
60,000
34.2
50
35% x 35 x 35%6
240 / 206
60GKB
same model with 3/8" spacing inlet grille

Expert Solution

Step 1

Given:

The outside temperature is T_o=95^oF= (95^oF+460.67)=554.67 R.
The inside temperature is T_i=80^oF=(80^oF+460.67)=539.67 R.

(a)

The COP of TempStar air conditioners for the model N4A318AKA can be calculated using the below relation:

$\begin{array}{rcl} C \end{array} \begin{array}{rcl} O \end{array} \begin{array}{rcl} P \end{array} \begin{array}{rcl} = & \frac{Q_{o}}{W_{i n}} \end{array} \begin{array}{rcl} C \end{array} \begin{array}{rcl} O \end{array} \begin{array}{rcl} P \end{array} \begin{array}{rcl} = \end{array} \begin{array}{rcl} \frac{Q_{o}}{V I} \end{array}$

Here, I is min. circuit ampacity for model N4A318AKA and V is the voltage rating of the single-phase that is V=230 V (supplied to the house). The voltage range supplied to the house is of range 220 V-240 V. The average rms value is 230 V.

Substitute all the known values in the above expression.

$\begin{array}{rcl} C O P & = & \frac{18000 \frac{btu}{h}}{230 \times 11.7} \\ C O P & = & \frac{18000 \frac{btu}{h}}{2691 W} \\ C O P & = & \frac{18000 \frac{btu}{h}}{2691 W \frac{3.42 \frac{btu}{h}}{1 W}} \\ \approx & 1.96 \end{array}$

Thus, the COP of temp star air conditioners is 1.96.

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