US 6,178,758 B2Granted

Refrigerating system

AssigneeElectrolux Siegen GmbH

InventorUwe Schwarzpaul

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Abstract

A refrigerating system is proposed which comprises a cooling circuit 7 for cooling a cooling room 3, the cooling circuit 7 comprising an evaporator 9 arranged in the cooling room 3 and passed by a coolant and the power to be supplied to the cooling circuit 7 being adjustable, a control device 23 for making available to the cooling circuit 7 a performance value stating the power to be supplied, a temperature sensor 27 for making available to the control device 23 a temperature measurement value essentially stating the temperature of the coolant in the evaporator 9, a clock 29 for making available to the control device 23 a predetermined first time interval and a pre-determined second time interval following the first time interval, wherein the control device 23 during the first time interval makes available a first performance value stating an essentially constant first power to be supplied and after the end of the first time interval makes available a second performance value stating a second power to be supplied which is greater than the first power to be supplied, wherein the control device 23 at the beginning of the second time interval detects a first temperature value and at the end of the second time interval detects a second temperature value and issues a defect signal when the absolute value of difference between the first and the second temperature values is less than a pre-determined value of difference.

Claims12

Dependent claims

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 (υe) 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 (t1, t2) and a pre-determined second time interval (t3, t4) following said first time interval (t1, t2),
wherein said control means (23) during said first time interval (t1, t2) makes available a first performance value (P1) stating an essentially constant first power to be supplied and after the end of said first time interval (t1, t2) makes available a second performance value (P2) stating a second power to be supplied which is greater than said first power to be supplied, and
wherein said control means (23) at the beginning (t3) of said second time interval detects a first temperature value (υ1) and at the end (t4) of said second time interval detects a second temperature value (υ2) and issues a defect signal (S) when said absolute value of difference between said first and said second temperature values (υ1, υ2) is less than a pre-determined value of difference (DIFF).

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/276,286Filed 25 Mar 1999 · continuation in part
Priority: DE 196 42 74516 Oct 1996
Granted: 30 Jan 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F25B 49/005
Arrangement or mounting of control or safety devices: of safety devices
F25B 15/10
Sorption machines, plants or systems, operating continuously, e.g. absorption type: with inert gas
F25B 2700/2104
Temperatures: of an indoor room or compartment
F25B 2700/2106
Temperatures: of fresh outdoor air