Gambar halaman
PDF
ePub

DECIDE WHETHER SCHEME IS OR IS NOT FEASIBLE

1. l'e heating of buildings is impracticable unless current can be sold very cheaply

*

? Heng a bathroom should not be considered impracticalde The use of a large quantity of electricity for a short time about 5. Pess is all that is necessary to give the desired temperature Vat four watts per cu ft is a fair basis to figure on For a bath, where a little auxiliary heat is necessary, a radiant

het heater placed on a chair in front of the baby will Every satisfactory This style of heater is also to be recommended for ti ket booths in moving picture theatres, for hot hers etc, where a lile beat is wanted m spots with twarming up the entire place

The heat g of large bodies of water is impracticable, unless rrent is very che.p. A rough rule is: Three watts will raise

Ka on one degree in one hour, in a vessel of which the three mensions are aproximately the same Do not think that water 1 heat in a vessel 6 feet long, 2 feet wide and 1 inch deep, eit a cover, as quickly as in a vessel 1 foot by 1 foot by The 11-4, with a cover, the quantity of water being the same

[ocr errors]

was for this is that there is more radiation from t'e 6 foot

[ocr errors][ocr errors]

2: ty 1 inch vessel, and the lack of a cover means a lig Exam; le Io heat hity gallons to 150 degrees in an hour, starting with water at 60 deg fähr in a vessel »e tree durensions are approximately the same world be red as foll wa

[merged small][merged small][merged small][ocr errors]
[ocr errors]
[ocr errors]

one ha'f four malt, ly the kilowatta ky irs divide b. 2 for lon, er peroks 1 tell y

[merged small][ocr errors][merged small][merged small][ocr errors][ocr errors][merged small][merged small]

(4) Learn why the customer wants to use electric heat. A great many people will reply that coal or gas is too expensive, yet we all know that a heat unit of electricity costs more than either coal or gas in a majority of cases. Of course there are factors that make electricity cheaper for doing certain work than either of the other two methods. If it affects the insurance, an electric heater can often be applied just where it is wanted, while with coal or gas the apparatus is bulky and much heat has to be generated which is wasted. Example: A steam boiler might be placed in a power house 700 or 800 feet away from a factory in which glue is to be heated. The size of the boiler might be 50 horsepower and if six glue pots were needed, the cost of a man's time in running the steam boiler, leaving out the question of coal, would be more than the cost of electricity at almost any

rate.

(5) Get a photograph or cut if possible, or make a rough sketch of the machine with dimensions of the part to be heated.

(6) Describe the operation of the machine in detail, stating the class of work. Example: Is the material fed automatically or by hand. If an oven, do not simply state that it is for drying skins, state how they are put in, i. e., are they hung on racks, tacked to boards, or how.

(7) Amount of material per charge. How many yards of goods go through machine per hour; how many parts and their weight go into oven at once; how many gallons of liquid are put in tank at once; how many articles are stamped per hour. (8) Maximum time for heating up. The salesman can help greatly by getting the maximum time required for heating by asking for more time. Usually a customer wants to heat up quickly. This means greater cost for apparatus, larger apparatus and extra wiring. Example: To come to work at 8 A. M. and start work at the heater within ten minutes might require 100 amperes. It is the salesman's duty to show this customer that it will be to his advantage to have his watchman or one of his men come in earlier and start the heater at 7 o'clock. This will allow seventy minutes instead of ten, and 18 amperes will do the work, with much less expense for heaters and wiring, and less danger of overheating, if forgotten.

(9) Accurate temperatures must be given, since wattage can

n4 be figured otherwise. Use a thermometer, do not guess. If an oven or a liquid is to be heated put a thermometer into it; if a part is to be heated put a thermometer on it and cover the end of te bulb with putty to get its temperatures, if it is heated by steam give the pressure, and the manufacturer can figure his temperatures approximately.

[ocr errors]

The rate of production per hour is very important, as the re material that comes in contact with the part heated the more beat is taken away

11) If water is to be evaporated from material get the percage, and sam; les of the material. If it is something like a rol to iron or press goods, state whether the goods are wet or dy, and get some idea of how they are moistened, if wet. Get sales of the goods.

12 If insulated, learn the thickness and what material is used aan moulator This important as heat will pass through thin walls or non insulated walls easily.

13. If there is ventilation to carry off fumes, give the size of the opening. This has to be known as heat is lost through this If the ventilator is connected with a chimney this will vik heat faster than an exhaust into the room. Get the ap1x ately height of the chimney from the flue connection, and the length of the pipe from oven to flue

14. Give the dimensions of an oven, box or receptacle, inside a. outde, and if a liquid, how deep, so that the heating engi A tank 2 by 2 eer can figure current consumption Example 1y 2 feet with 6 in hes of water in it, differs from a tank 2 by 2 * 2 feet, as in the latter case an engineer would figure on a full

[ocr errors]

Ascertain the dimensions and the form of the space availe fra heater The smaller the heater the ter the wire and e sorter the life, the larger the heater the Leavier the wire and the Lager the lite therefore, get from the customer the out 1 le dimensiÓTIN There are certain limitations to follow, such as biles etc, in order to make it easy to c test to a machine then the beater van pro est on one side or extent higher up so as to get the necessary room

16 Pe sure to give the line voltage and state the kind of cur test, whether alternating or direct

(17) Ask if the heater would be subject to vibration. If so, extra precautions will have to be taken in constructing it. Explain fully about vibration.

GENERAL INFORMATION

If a branding iron is wanted, get the size of the brand, and a sample of the article to be branded. Learn whether the brand. is for wood or skins, whether the wood or skins are wet or dry, whether the wood is hard or soft. A sample of the branded article is necessary. The rate of speed must be given.

If a commercial place needs what is known as standard goods, such as tailors' irons, glue pots, soldering irons, etc., get the size, weight or capacity of the articles now in use; e. g., measure the glue receptacle (the part that holds the glue); if a flat iron, lay it on a piece of paper, outline the bottom, weigh it, and note the class of goods to be pressed.

In a good many cases standard apparatus can be installed provided the heater recommended is to be used for work similar to that for which is was made. Do not use a stove, grill, luminous radiator or flatiron to heat an oven; they were not made for that purpose. Recommend the purchase of an oven heater. Do not use a stove to heat a flatiron, as the stove will not last, is wasteful of current and does not heat the iron properly.

Machines that operate red-hot (about 1200 degrees fahr.) it is usually impracticable to heat.

All commercial and industrial apparatus must be properly installed, with proper wiring, etc. Example: A flatiron in the home is used about 200 hours a year, in the factory about 2000 hours a year, hence different wiring is necessary. All irons to be used in factories should have the cord permanently attached with the disconnecting plugs at the receptacles. A cord support should be strongly recommended, whether a spring, elastic, or one of the many on the market for this purpose. To say nothing of trouble and dissatisfaction, the cost of repairs for cords, plugs and parts on flatirons installed without such supports will in a year's time more than equal the cost of a support.

It is very important after an article has been installed in a factory to have some means of inspecting it to make sure that it

is in service and is entirely satisfactory to the customer. To do v je gerly a repair and maintenance department is necessary; means service to the customer and dollars and cents to the

1

An information sheet or card is recommended on which the an should enter the necessary information obtained on the -er's prenases. It can also be used for filing purposes, to referred to in case a similar installation is to be figured on A complete office record should be kept of all installations, data regarding meter and current consumption per per year. The records of one central station that might ef show that irons average 644 kilowatts per iron per in factories. This result is not estimated It was obtained test on nire factories that have used flatirons for several in the irons being counted and the meter read.

[ocr errors][ocr errors]
[ocr errors]

INFORMATION SHEET

[ocr errors]

to be accomplished

dot why existing method of heating is unsatisfac

oder whether electric heating world tend to overcome

Amenities and would offer other advantages

raph or cut with all dimensions of part to be Weight

Size

gerati n of machine with class of work in detail

[blocks in formation]

her is to be evaporate 1 from material, what per.entage

[ocr errors][merged small][ocr errors][merged small][ocr errors][merged small][ocr errors][merged small][merged small][merged small][ocr errors]
« SebelumnyaLanjutkan »