METHOD FOR CONTROLLING A VAPOUR COMPRESSION SYSTEM DURING START-UP
First Claim
1. A method for controlling a vapour compression system during start-up, the vapour compression system comprising a compressor, a condenser, an expansion device having a variable opening degree, and an evaporator arranged along a refrigerant path, the method comprising the steps of:
- starting operation of the vapour compression system,monitoring a first temperature, T1, of refrigerant entering the evaporator,monitoring a second temperature, T2, of refrigerant leaving the evaporator,deriving a first rate of change, Δ
T1, of the first temperature, and a second rate of change, Δ
T2, of the second temperature,comparing the first rate of change, Δ
T1, to the second rate of change, Δ
T2,based on the comparing step, determining a refrigerant filling state of the evaporator, andcontrolling the opening degree of the expansion device according to a first control strategy in the case that it is determined that the evaporator is full or almost full, and controlling the opening degree of the expansion device according to a second control strategy in the case that it is determined that the evaporator is not full.
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Accused Products
Abstract
A method for controlling a vapour compression system during start-up is disclosed. The rate of change, ΔT1, of the temperature of refrigerant entering the evaporator, and the rate of change, ΔT2, of the temperature of refrigerant leaving the evaporator are compared. Based on the comparing step, a refrigerant filling state of the evaporator is determined. The opening degree of the expansion device is then controlled according to a first control strategy in the case that it is determined that the evaporator is full or almost full, and according to a second control strategy in the case that it is determined that the evaporator is not full. Thereby it is ensured that a maximum filling degree of the evaporator is quickly reached, without risking that liquid refrigerant passes through the evaporator.
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Citations
20 Claims
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1. A method for controlling a vapour compression system during start-up, the vapour compression system comprising a compressor, a condenser, an expansion device having a variable opening degree, and an evaporator arranged along a refrigerant path, the method comprising the steps of:
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starting operation of the vapour compression system, monitoring a first temperature, T1, of refrigerant entering the evaporator, monitoring a second temperature, T2, of refrigerant leaving the evaporator, deriving a first rate of change, Δ
T1, of the first temperature, and a second rate of change, Δ
T2, of the second temperature,comparing the first rate of change, Δ
T1, to the second rate of change, Δ
T2,based on the comparing step, determining a refrigerant filling state of the evaporator, and controlling the opening degree of the expansion device according to a first control strategy in the case that it is determined that the evaporator is full or almost full, and controlling the opening degree of the expansion device according to a second control strategy in the case that it is determined that the evaporator is not full. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification