ICE BOX TEST RESULTS OF TWO IDENTICAL BOXES,
ONE LINED INTERNALLY WITH THE HEAT SHIELD REFRIGERATION LINER
Most significant of the results is not only the extended time the liner provides, but the flat line temperature below 40 degrees for much longer than standard insulation. This means that your cold storage area remains well with in the food safe storage area until the very last few hours of the life of your ice. There is not a fluxing rising and falling temperature within the cold storage area. the ice or refrigeration unit is able to only cool down the immediate area inside the storage box without having to worry about excess heat gains thru the insulation.
TEST CONDITIONS
1. A temperature chamber was maintained at 80 degrees during daylight hours and 74 degrees at night. the average temperature was 77 degrees F.
2. Temperature probes were calibrated and tested over the range of the test for tracking accuracy. probe uncertainty is not more than 0.5 degree F.
3. two blocks of ice of identical weight 8 lb., were inserted into each box at the start time of 0700 on day 1.
4. Insulating value was measured by determining when all of the ice was melted. This occurred when both ice boxes reached 50 degrees F.
5. Results show ; a. The box with out the liner made a linear progression from the temperature of the ice, 27 degrees to 50 degrees over 55 hours. b. The box with the liner inserted in two parts (not sealed together), made a non linear progression from 27 degrees to 40 degrees over 100 hours and then lost ~1 degree / hour to reach 50 degrees at 110 hours.
6. The unlined cooler gained 2.09 Btu/sq. ft/hr x 24 = 50.16 Btu at an average temperature difference of 32.5 degrees inside to outside, the equivalent of 2 inches of urethane foam insulation.
7. The lined cooler gained 1.05 Btu/sq. ft/hr x 24 = 25.2 Btu at an average temperature difference of 42.5 degrees inside to outside, the equivalent of 6 inches of urethane foam insulation, subtracting the 2 inches provided by the ice box leaves you with adding 4 inches of insulation by installing the liner. BTU gain is measured based on the external sq ft. surface area of the box.
Test results show that adding the liner to the inside of the ice box is the equivalent of adding 4 inches of urethane foam. This liner is 1/2 inch thick.
