NATIONAL BUREAU OF STANDARDS REPORT

NB$ REPORT

February 19 , i960 667O

NBS PROJECT

1003 - 20-4891

CAPACITY TESTS OP TWO REMOTE AIR-COOLED

SIZE B REFRIGERANT CONDENSERS

Manufactured by

Kramer Trenton Company

Trenton, New Jersey

by

P. J, J, Drapeau and C, W. Phillips

Air Conditioning, Heating, and Refrigeration Section

Building Technology Division

to

Mechanical Engineering Division

Headquarters,

Quartermaster ResearOh and Engineering Command

Natick, Massachusetts

NATIONAL BUREAU OF ST/

Intended for use within the ( to additional evaluation and n

listing of this Report, either li the Office of the Director, Nal however, by the Government i to reproduce additional copie;

IMPORTANT NOTICE

Approved for public release by the

Director of the National Institute of

Standards and Technology (NIST) on October 9, 2015.

•ogress accounting .docurnents

nally published It Is subjected

eproductlon, or open-literature

Ion Is obtained In writing from

Such permission Is not needed,

)repared If that agency wishes

<NBp»

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

CAPACITY TESTS OP TWO REMOTE AIR-COOLED

SIZE B REFRIGERANT CONDENSERS

Manufactured by

Kramer Trenton Company

Trenton_, New Jersey

by

F. J. J. Drapeau and C. W. Phillips

I . INTRODUCTION

Capacity tests were made of two specimens of Size B remote

air-cooled refrigerant condensers manufactured by the Kramer

Trenton Company of Trenton^ New Jersey. These specimens were of

identical dimensions and were identified for testing purposes as

NBS 147-58 and NBS 146-58. Specimen NBS 147-58 was a Class I

condenser and consisted of a copper coil with aluminum fins.

Specimen NBS 146-58 was a Class 2 condenser and consisted of a copper coil with copper fins.

The tests were made with an apparatus conforming in most

details to that described in the proposed ASRE Standard for remote air-cooled condensers,, PS2.4. This apparatus provided a means for measuring the heat transfer capacity of the specimens

by the psychrometric method and by the refrigerant flow method.

2. TEST PROCEDURE

The capacity tests were made at an ambient temperature of

IIO°F^ established as a standard for QMR&E application.

These tests were a part of a series of tests planned under

the Condenser Standardization Project, QMREL-M P.O. 57-26, to

determine the possibility of standardizing air-cooled condenser

performance on the basis of maximum overall dimensions and minimum air flow rate.

These condensers were tested with a Torrington propeller fan

with air delivery capacity meeting the minimum requirement of the

QMR&E Purchase Description dated March 22, 1957-
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3. TEST RESULTS

The results obtained and the dimensional data describing

these condensers are attached. Figure 1 indicates the shape

and tube arrangement of both specimens,, and uses letter symbols to identify the dimensions of the specimens as summarized

in Tables 1 and 2. Table 1 describes the materials and construction of the Class 1 condenser with aluminum fins and lists

significant dimensions of coll, fins, and complete unit. Table 2

summarizes the corresponding information on the Class 2 condenser

with copper fins.

Tables 3 ^nd 4 summarize the test data, and the heat rejection capacity ratings and heat transfer coefficients computed therefrom. Figure 2 is a pressure-enthalpy diagram labeled

with the symbols used in the proposed ASRE Standard, PS2.4. This

diagram indicates the changes occurring in state conditions of the

refrigerant between the condenser inlet and outlet.

Two Size B, Class 1 condensers, NBS 135-57 ^nd NBS 147-58,

both manufactured by the Kramer Trenton Company, were received

under this standardization project. As indicated by letter

symbol K of item 1, in the section on Coil Dimensions of Table 1,

specimen NBS 147-58 consisted of a 2-section coll. The upper

section had 215 fins and the lower section had 218 fins. Specimen NBS 135-57^ examined for comparison purposes, consisted of a 3-sectlon coil with fins 16 in. high on the top section, 8 in.

high on the middle section, and 10 in. high on the bottom section.

The top section had 219 fins, the middle section had 216 fins, and

the bottom section had 214 fins.

In order to provide a further means for comparing the performance of the various types of fins, tube arrangements, etc.,

of the several condensers in this test program, two additional

coefficients were evaluated, which can be considered as Items 24

and 25 of Tables 3 and 4 as follows:

Item 24 Heat Rejection per Unit of Total Surface Area per

Degree F Log Mean Temperature Difference,

Btu/hr (ft2 )

( °F

)

Item *:2S,- Heat Rejection per Unit of Total Surface Area per

Degree F Log Mean Temperature Difference per cfm

of Standard Air, Btu/hr ( ft^) ( °F )

( cfm

)

-3-

Addition to Table 2

Item QMR&E High Ambient Temperature

Free Discharge

Specimen No. NBS 147-58 NBS 146-58

Fin Material Aluminum Copper

24. 5.32 5.55

25. 0.00166 0.00174

In comparing the results on the two condensers, it will

be noted that the Class 1 specimen with aluminum fins had about

2% more total surface area than the Class 2 specimen with copper

fins, but the heat transfer coefficients shown as items 24 and

25 above were about higher on the specimen having the copper

fins. The rating of the specimen with alumlnoim fins was about

92^ and that of the specimen with copper fins about 93^ of the

required value of 35^600 Btu/hr.

USCOMM-NBS-DC I

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§ Figure 1

USCOMM-NBS-DC

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PRESSURE - ENTHALPY

DIAGRAM

NO SCALE

ENTHALPY (BTU/lb)

NOTE > LAOCLED IN ACCORDANCE

• W/r« A3RE PS Z .-4 CONDENSER SPECIMEN

DIAGRAM

Figure 2

CONDEN6ER 3PECMEN

MFR. Kramer Trenton Company size - b ^ MBS NO. 147-58 - 1

ITEM PROPERTY REMARKS

COIL TUBE CHARACTERISTICS

1 MATERIAL Conner Type L

2 NUMBER OF ROWS DEEP s 3 NUMBER OF TUBES HIGH 34 , 4 NUMBER OF CIRCUITS IN PARALLEL 3

5 NUMBER OF TUBES PER CIRCUIT 34

6 TUBE DIAMETER , 0. D. , IN. 3/8

7 TUBE WALL THICKNESS , IN. 0.030

a TUBE RETURN BEND DIAMETER , O. D. . IN

3/8

9 G/»a INLET CONNECTION DIAM . ,O.D. , IN. 7/8 1 10 LIQUID OUTLET CONN . DIAMETER, O.D, IN. 5/8

II VERTICAL TUBE SPACING t IN. S 1.0

12 PRIMARY SURFACE AREA , SQ.FT. 22.6

COIL FIN CHARACTERISTICS

1 MATERIAL Alumimmn

2 TYPE OF FIN Embossed Rolled collar

'' S FIN SPACING , PER INCH 8 215 fins on upper sec.

4 FIN THICKNESS , IN. O.OOQ 218 fins on lower sec.

S SECONDARY SURFACE AREA , SQ.FT. 283.2

COIL DIMENSIONS

1 FINNED HEIGHT, IN. K 34.0 fins in 2 sec. vertical!

2 FINNED WIDTH , IN. F 27.1 upper sec. 22 in. high ' 3 FINNED DEPTH, IN. V 3.0 lower sec. 12 in. high i 4 COIL HEIGHT , IN. H . 33.0 1

I S COIL WIDTH , IN. W 29.5

!

1 6 COIL DEPTH , IN. D 2.0 I 7 COIL DEPTH , OVERALL , IN. N 10.6

a FACE AREA , SQ. FT. 6.4 ! 9 TOTAL SURFACE AREA, SQ.FT. 305.8 1

1 10 distance between connections t 31.0 1

1 OVE/SALL CONDENSER. DIMENSIONS

/ WIDTH , OVERALL , IN. A 32.5

2 WIDTH , SHROUD , IN. B 27.4

HEIGHT , IN. C 34 . 1 ,

' T 4 DEPTH , IN. E 11.0 1

! BELLMOUTH ORIFICE DIAMETER , IN, A 2^ 5/8 , j 6 BELLMOUTH RADIUS , IN. R 1

'

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CONDEN6ER SPECIMEN

MFR. Kramer Trenton Company SIZE - B

NBS NO. 146-58 CLASS - 2

ITEM PROPERTY REMARKS

COIL TUBE CHARACTERISTICS

1 MATERIAL Copper Type L

2 NUMBER OF ROWS DEEP 3

3 NUMBER OF TUBES HIGH 34

4 NUMBER OF CIRCUITS IN PARALLEL 3

5 NUMBER OF TUBES PER CIRCUIT 34

e TUBE DIAMETER , 0. D. , IN. 3/8

7 TUBE WALL THICKNESS , IN. o.oso

& TUBE RETURN BEND DIAMETER , O. D. . IN

3/8

9 GAS INLET CONNECTION DIAM . ,O.D. , IN. 7/8 1

10 LIQUID OUTLET CONN . DIAMETER, 0.0, IN. 5/8

II VERTICAL TUBE SPACING , IN. S o

I

—

12 PRIMARY SURFACE AREA , SQ.FT. 22.6

COIL FIN CHARACTERISTICS

1 MATERIAL Copper

2 TYPE OF FIN Embossed Rolled collar

S FIN SPACING , PER,INCH 8 211 fins on unoer sec. i 4 FIN THICKNESS , IN. 0,009 212 fins on lower sec.

S SECONDARY SURFACE AREA , SQ.FT. 277.0 . .

. COIL dimensions

1 FINNED HEIGHT, IN. K S4.0 fins in 2 sftc . verticallyJ

2 FINNED WIDTH , IN. F 27.1 upper sec. '22 In. high i 3 FINNED DEPTH , IN

V' 3.0 lower sec. 12 in. high i 4 COIL HEIGHT , IN. H 33.0 1 3 COIL WIDTH , IN. W _ 29.5

1

1 e COIL DEPTH , IN. D OJ o

1

1 1 COIL, DEPTH , OVERALL , IN. N 10.6 . - -

. 1 Q FACE AREA , 3Q. FT, 6.4 i 9 TOTAL SURFACE AREA, SQ.FT. 299.7 .

. 10 DISTANCE BETWEEN CONNECTIONS T 31.0 . . ....

' OVERALL CONDENSER DIMENSIONS

1 WIDTH , OVERALL , IN. A 32.5

>

2 WIDTH , SHROUD , IN. B 27.4

S HEIGH T , IN. C 34. .1

I 4 DEPTH , IN. E 11.0 i

! s BELLMOUTH ORIFICE DIAMETER , IN

X 24.6

6 BELLMQUTH RADIUS , IN. R

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