Patent ID: 6178758
Filing Date: 2001-01-30
Classification: F25B,F25D

Abstract:
Refrigerating system comprising:a cooling circuit (7) for cooling a cooling room (3), said cooling circuit (7) comprising an evaporator (9) arranged in said cooling room (3) and passed by a coolant and the power to be supplied to said cooling circuit (7) being adjustable,a control means (23) for making available to said cooling circuit (7) a performance value (P) stating the power to be supplied,a temperature sensor (27) for making available to said control means (23) a temperature measurement value (.upsilon..sub.e) essentially stating the temperature of said coolant in said evaporator (9),a clock (29) for making available to said control means (23) a pre-determined first time interval (t.sub.1, t.sub.2) and a pre-determined second time interval (t.sub.3, t.sub.4) following said first time interval (t.sub.1, t.sub.2),wherein said control means (23) during said first time interval (t.sub.1, t.sub.2) makes available a first performance value (P.sub.1) stating an essentially constant first power to be supplied and after the end of said first time interval (t.sub.1, t.sub.2) makes available a second performance value (P.sub.2) stating a second power to be supplied which is greater than said first power to be supplied, andwherein said control means (23) at the beginning (t.sub.3) of said second time interval detects a first temperature value (.upsilon..sub.1) and at the end (t.sub.4) of said second time interval detects a second temperature value (.upsilon..sub.2) and issues a defect signal (S) when said absolute value of difference between said first and said second temperature values (.upsilon..sub.1, .upsilon..sub.2) is less than a pre-determined value of difference (DIFF).