Analyze the effect of critical time on temperature changes in medicine storage refrigerators by opening the cabinet

Abstract

Background: developed a monitoring equipment for Thammasat University Hospital Medical Equipment Division monitoring temperature by embedded microprocessors to survey, record, and report temperatures of refrigerators storing solutions for the Medical technology laboratory. Solution testing was done by the Thammasat University Hospital Medical Technology Laboratory. Users and administrators of this innovation noted that the embedded microprocessors device, occupationally reported data more frequently than necessary, It caused wasting of storage space and energy used to measure temperatures.

Objective: To find the critical time causing refrigerated solutions to rise to specified temperatures and use that information to adjust notification time for displaying information to store data correctly and identify an appropriate time for opening and closing the refrigerator containing solutions.

Methodology: Developmental research was done to ascertain time and duration of opening and closing of refrigerators containing solutions by embedded microprocessors to monitor, record, and report refrigerator temperatures. In addition, the time used to examine solutions was measured by doing 20 retests each, with results employed to ascertain average critical time by average value calculation methods. Equipment used included: 1) temperature notifying equipment using embedded microprocessors; 2) refrigerator storing solutions; 3) solutions; 4) test tubes; 5) test tube stand; and 6) digital thermometer. Data was analyzed by the time recorded from temperature-notifying equipment by embedded microprocessors to calculate critical time for improving notification timing and find safe timing for opening the refrigerator without raising solution temperatures above standard storage levels.

Results: Six minutes was the critical time for causing refrigerated solution temperature to rise, hitting the standard temperature line. Every two minutes was the notification and recording time for temperature recording equipment by embedded micro-processors. (1/3 of critical time) and three minutes is the maximum time that the refrigerator may be left open.

Conclusion: Six minutes is the time causing solutions to rise in temperature until the set temperature (8 degrees Celsius) when opening the refrigerator. Two minutes is the time used for recording and notification, while three minutes is the maximum time for left the refrigerator open.