Temperature controlled thawing method and apparatus

A thawing apparatus for thawing organic material, comprising:

• a housing;
• a thawing compartment configured to receive organic material provided inside said housing;
• a fan configured to circulate a thawing medium through said thawing compartment and a circulation channel inside said housing;
• a heating element configured to heat said thawing medium being circulated;
• a heat exchanger configured to cool said thawing medium being circulated;
• one or more temperature sensors, which measure the temperature of said thawing medium;
• and
• a controller communicating with said one or more temperature sensors, said heating element and said heat exchanger;
• wherein said controller is configured to:
• control said heating element and said heat exchanger to reduce the temperature of said thawing medium from a first temperature, T1, to a second temperature, T2, lower than T1;
• monitor a heat transfer resistance of said organic material by monitoring temperature variations from T1 of said thawing medium during circulating and by monitoring a frequency or an amplitude of said temperature variations of said thawing medium from T1 during circulating;
• and
• detect a shift between outer heat resistance transferal and inner heat resistance transferal of said organic material, said shift being detected when said monitoring shows that said monitored frequency or amplitude of said temperature variations from T1 differs at least by 5% from an average amplitude value or an average frequency value, wherein the average amplitude or frequency is calculated after measured temperature has over-shot or under-shot T1 at least two times for a specific time frame.