Cooling Load Estimate Form - Sharp AF-05CML Service Manual

Table of Contents

AF-05CML

INSTRUCTIONS FOR USING COOLING LOAD ESTIMATE FORM FOR ROOM AIR CONDITIONERS

(AHAM PUB. NO. RAC-1)

A. This cooling load estimate form is suitable for estimating the cooling load for comfort air conditioning installations

which do not require specific conditions of inside temperature and humidity.

B. The form is based on an outside design temperature of 95˚F dry bulb and 75˚F wet bulb. It can be used for areas in

the continental United States having other outside design temperature by applying a correction factor for the

particular locality as determined from the map.

C. The form includes "day" factors for calculating cooling loads in rooms where daytime comfort (such as living rooms,

offices, etc.).

D. The numbers of the following paragraphs refer to the correspondingly numbered item on the form:

1. Multiply the square feet of window area for each exposure by the applicable factor. The window area is the area

of the wall opening in which the window is installed. For windows shaded by inside shades or venetian blinds, use

the factor for "Inside Shades". For windows shades by outside awnings or by both outside awnings and inside

shades (or venetian blinds), use the factor for "Outside Awnings". "Single Glass" includes all types of single

thickness windows, and "Double Glass" includes sealed air space types, storm windows, and glass block. Only

one number should be entered in the right-hand column for item 1, and this number should represent only the

exposure with the largest load.

2. Multiply the total square feet of all windows in the room by the applicable factor.

3a. Multiply the total length (linear feet) of all walls exposed to the outside by the applicable factor. Doors should be

considered as being part of the wall. Outside walls facing due north should be calculated separately from outside

walls facing other directions. Walls which are permanently shaded by adjacent structures should be considered

as being "North Exposure". Do not consider trees and shrubbery as providing permanent shading. An insulated

frame wall or a masonry wall 8 inches or less in thickness is considered "Light Construction". An insulated frame

wall or a masonry wall over 8 inches in thickness is considered "Heavy Construction".

3b. Multiply the total length (linear feet) of all inside walls between the space to be conditioned and any unconditioned

spaces by the given factor. Do not include inside walls which separate other air conditioned rooms.

4. Multiply the total square feet of roof or ceiling area by the factor given for the type of construction most nearly

describing the particular application. (Use one line only.)

5. Multiply the total square feet of floor area by the factor given. Disregard this item if the floor is directly on the

ground or over a basement.

6. Multiply the number of people who normally occupy the space to be air conditioned by the factory given. Use a

minimum of 2 people.

7. Determine the total number of watts for lights and electrical equipment, except the air conditioner itself, that will

be in use when the room air conditioning is operating. Multiply the total wattage by the factor given.

8. Multiply the total width (linear feet) of any doors or arches which are continually open to an unconditioned space

by the applicable factor.

NOTE: Where the width of the doors or arches is more than 5 feet, the actual load may exceed the calculated

value. In such cases, both adjoining rooms should be considered as a single large room, and the room air

conditioner unit or units should be selected according to a calculation made on this new basis.

9. Total the loads estimated for the foregoing 8 items.

10. Multiply the sub total obtained in item 9 by the proper correction factor, selected from the map, for the particular

locality. The result is the total estimated design cooling load in BTU per hour.

E. For best results a room air conditioner unit or units having a cooling capacity rating (determined in accordance with

the NEMA Standards Publication for Room Air Conditioners, CN 1-1960) as close as possible to the estimated load

should be selected. In general, a greatly oversized unit which would operate intermittently will be much less

satisfactory than one which is slightly undersized and which would operate more nearly continuously.

F. Intermittent loads such as kitchen and laundry equipment are not included in this form.