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Cork insulation; a complete illustrated textbook on cork insulation ...

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382 CORK INSULATION<br />

at the daily expense of labor and ice ; and some improvement I<br />

may be effected by the manufacturer through a change in {<br />

the interior design of the refrigerator that will locate the ice<br />

compartment in a top-center positi<strong>on</strong>, and at no additi<strong>on</strong>al<br />

expense; but by increasing the thickness of permanently effi-<br />

cient <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> in the walls of the refrigerator, at a low per- ><br />

centage of increase in manufacturing cost, the food compartment<br />

may be so effectively isolated from outside heat influ-<br />

ences as to make the maintenance of correct temperatures by<br />

the melting of ice a practical matter even <strong>on</strong> the hottest and<br />

the most humid days of the year. Experience has safely fixed<br />

this <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> at three inches of pure <strong>cork</strong>board, when prop-<br />

erly incorporated in the c<strong>on</strong>structi<strong>on</strong> of the refrigerator.<br />

From these few observati<strong>on</strong>s, it would appear to be of but<br />

limited value to test poorly designed and badly c<strong>on</strong>structed<br />

refrigerators that are to be cooled with ice. C<strong>on</strong>sequently,<br />

the first point to cover in planning for a test of an ice refrig-<br />

erator should be a careful investigati<strong>on</strong> into the design and<br />

c<strong>on</strong>structi<strong>on</strong> of the unit; and if this research reveals a lack<br />

of reas<strong>on</strong>able c<strong>on</strong>siderati<strong>on</strong> for basic principles of design and<br />

c<strong>on</strong>structi<strong>on</strong>, as they are then generally known and under-<br />

stood, there probably will be good reas<strong>on</strong> to aband<strong>on</strong> the<br />

intenti<strong>on</strong> to perform the test. Otherwise, the following test<br />

c<strong>on</strong>diti<strong>on</strong>s should be observed<br />

:<br />

(a) Refrigerators of identical shape and size must be selected for<br />

comparative test purposes. It is suggested that standard sizes be determined<br />

up<strong>on</strong> for a top-icer apartment refrigerator, a side-icer small residence<br />

refrigerator and a center-icer large residence refrigerator, and that<br />

all future tests be run <strong>on</strong> refrigerators as near those sizes as possible.<br />

(b) A c<strong>on</strong>stant temperature room should be used, the temperature<br />

held uniform to within <strong>on</strong>e degree Fahr. by electric heater placed within<br />

hollow walls of the test room and c<strong>on</strong>trolled by thermostat. A room tem-<br />

perature of at least 85° F. is suggested for test purposes.<br />

(c) C<strong>on</strong>trol of the humidity of the c<strong>on</strong>stant temperature room should<br />

be effected by suitable means, tests having dem<strong>on</strong>strated that a c<strong>on</strong>sider-<br />

able increase in the percentage of ice melting is effected by increasing the<br />

percentage of relative humidity in a c<strong>on</strong>stant temperature room from a low<br />

to a high point.<br />

(d) The ice should be carefully regulated <strong>on</strong> the basis of weight, and<br />

of <strong>on</strong>e piece, of size or shape suitable for the ice compartment of the<br />

class of unit tested.<br />

(e) The ice should be <strong>on</strong>ly hard, "black" ice.<br />

j

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