K - Value

The K-Value of an item provides you with information relative to the amount of heat or cold that is lost through the item.

In order to determine the K-Value of an item (cabinet) the following tests must be conducted:

	First Step is to place the cabinet into a "Hot Room"; the temperature of this "Hot Room" must be kept at 20^oC.
	At least three temperature sensors are placed inside the cabinet in order to measure the temperature inside the cabinet.
	A heater is placed inside the cabinet in order to stabilize the temperature inside the cabinet to 35^oC. The difference between the inside and outside of the cabinet is called the "Delta T". For example 35 - 20 = 15. Usually this test must be repeated several times while varying the heat output of the heater in order to achieve exactly 35^oC.
	The heat input (expressed in Watts) which gives you the 35^oC inside the test cabinet is the figure you use in the K-Value Formula.
	Formula: k = heat input (W) divided by the mean surface (m2) of the cabinet times the Delta T (15). k = W/Sx Delta T.

The K-Value of a good insulated cabinet, or a very well insulated home should be low; the lower the K - Value the better it is. For Blood Refrigerators the K-Value must be below 0.35

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