NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

1003-20-4891 May 27, 1959 6420

CAPACITY TEST OP A REMOTE AIR-COOLED

SIZE B, CLASS I REFRIGERANT CONDENSER

Manufactured by

McQuay, Incorporated

Minneapolis^ Minnesota

by

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

Air Conditioning, Heating, and Refrigeration Section

Building Technology Division

to

Mechanical Engineering Division

Headquarters,

Quartermaster Research and Engineering Command

Natick, Massachusetts

IMPORTANT NOTICE

NATIONAL BUREAU OF SD

intended for use within the ( to additional evaluation and r listing of this Report, either i the Office of the Director, Na

however, by the Government

to reproduce additional copie

Approved for public release by the

Director of the National Institute of

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

rogress accounting documents

mally published it is subjected

reproduction, or open-literature

ion is obtained In writing from Such permission is not needed,

prepared if that agency wishes <NB^

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
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CAPACITY TEST OF A REMOTE AIR-COOLED

SIZE B, CLASS I REFRIGERANT CONDENSER

Manufactured by

McQuay^ Incorporated

Minneapolis^ Minnesota

by

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

I . INTRODUCTION

A capacity test was made of a remote air-cooled refrigerant condenser,, Size Class Ij manufactured by McQuay,, Inc.,,

of Minneapolis, Minnesota. This specimen was identified for

testing purposes as NBS 19 ^- 59 - This test was made with an apparatus conforming in most

details to that described in the proposed ASRE Standard for

remote air-cooled condensers, PS 2.4. This apparatus provided

a means for measuring the heat transfer capacity of this specimen by the psychrometric method and by the refrigerant flow

method

.

2. TEST PROCEDURE

This capacity test was made at an ambient temperature of

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

This test is a part of a series of tests planned under the

Condenser Standardization Project, QMREL-M P. 0. 57-26, to

determine the possibility of standardizing air-cooled condenser

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

This condenser was 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

this condenser are attached. Eig. 1 indicates the shape and

tube arrangement^ and uses letter symbols to identify the dimensions of the specimen as summarized in Table 1. Table 1

describes the materials and construction of the condenser and

lists significant dimensions of coll^ flns^ and complete unit.

Table 2 summarizes the test data_, and the heat rejection

capacity ratings and heat transfer coefficients computed therefrom. Fig. 2 is a pressure-enthalpy diagram labeled with the

symbols used in the proposed ASRE Standard, PS 2.4. This diagram indicates the changes in state conditions of the refrigerant

occurring between the condenser inlet and outlet.

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 which can be considered as Items 24 and 25 of Table

2 are as follows:

Item 24 Heat Rejection per Unit of Total Surface Area

per Degree F Log Mean Temperature Difference,

Btu/hr (ft2)(°Fj

Item 25 Heat Rejection per Unit of Total Surface Area

per Degree F Log Mean Temperature Difference

per cfm of Standard Air, Btu/hr (ft2 )

( °F) (cfm)

Addition to Table 2

Item QMR&E High Ambient Temperature

Free Discharge

24 7.08

25 0.00214

It should be noted that the heat rejection capacity of this

condenser was 90 percent of the required value of 35^600 Btu

per hour.
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specimen

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194-59

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PRESSURE - ENTHALPY

DIAGRAM

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LABELED IN ACCORDANCE

WITH AS RE PS 2.4

CONDENSER SPECIMEN

blAGRAM

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CONDENSER SPECIMEN

MFR. McQuay, Inc. OIZE - B

A//36 NO. 194-59 CLASS - 1

ITEM PROPERTY REMARKS

COIL TUBE CHARACTERISTICS

1 MATERIAL Copper Type L

2 NUMBER OF /e0lV3 DEEP 3

3 NUMBER OF TUBES HIGH 24

4 NUMBER OF CIRCUITS IN PARALLEL 3

5 NUMBER OF TUBES PER CIRCUIT 24 . 6 TUBE DIAMETER , 0. D. ,/N. 1/2

7 TUBE WALL THICKNESS , IN. 0.036

B TUBE RETURN BEND DIAMETER , O. D.

IN. 1/2

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

10 LIQUID OUTLET CONN . DIAMETER , O.D ,IN. S/8

II VERTICAL TUBE SPACING , IN. S 1.3

12 PRIMARY SURFACE AREA , SQ.FT. 20.0

COIL FIN CHARACTERISTICS

1 MATERIAL Aluminum

2 TYPE OF FIN Corrugated Rolled Collar

S FIN SPACING , PER INCH 7 164 Fins

4 FIN THICKNESS , IN. 0.011

s5 SECONDARY SURFACE AREA , 3Q.fr. 1Q7.4

COIL DIMENSIONS

1 FINNED HEIGHT, IN. K 30.0

2 FINNED WIDTH , IN. F PS.

3 FINNED DEPTH , IN. V 3.1

4 COIL HEIGHT , IN. H pq.4

S COIL WIDTH , IN. W 28.8

G COIL DEPTH , IN. D i

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CVJ 7 COIL DEPTH , OVERALL , IN. N 10-8

a FACE AREA , 3Q. FT. S.3 i. 9 TOTAL SURFACE AREA, SQ.FT. 217.5 j 10 DISTANCE BETWEEN CONN., IN. T 29.4 1 OVERALL CONDENSER DIMENSIONS

1 WIDTH , OVERALL , IN. 3? . S

2 WIDTH , SHROUD , IN. B 27.0

S HEIGH T , IN. C 34.1

4 DEPTH , IN. E 11.0

S BELLMOUTH ORIFICE DIAMETER , IN. A 24 S/8 ± 1/2 inch

6 BELLMOUTH RADIUS , IN. R 11/16 i 7 HEIGHT, SHROUD, IN. . L 30.0

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