Method of optimising the performance of refrigerant vaporizers including improved frost control method and apparatus
First Claim
1. A method of optimizing performance of a refrigeration device operated with a refrigerant and fed via an expansion valve, characterized in that:
- in addition to a supply air temperature, both a vaporization temperature and an air cooler outlet temperature at an outlet tube are measured and a first temperature difference value measured between said supply air temperature and said vaporization temperature is determined;
said difference value is multiplied by a factor to provide a computed temperature value and said computed temperature value which is obtained is compared with a second temperature difference value measured between said air cooler outlet temperature at an outlet tube and said vaporization temperature to provide a comparison value; and
the expansion valve at an inlet side of the refrigerator device is controlled responsive to said comparison value in such a way that said air cooler outlet temperature provides said second temperature difference value at least substantially the same as said computed temperature value.
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Abstract
A method is described for the performance optimization of refrigeration devices fed with refrigerant, in particular of air refrigeration devices in which a setting value is formed for an electrically or electronically operatable expansion valve in dependence on different temperature measurements continually ensures the ideal filling of the vaporizer. The invention includes a method of optimising the performance of a fan air refrigerator and of determining the ideal timepoint for defrosting is described, with the time for defrosting being determined by a comparative monitoring of a temperature difference, on the one hand, and a time related monitoring of the refrigerant throughflow, on the other hand. In addition the cold room temperature is regulated by the supply air sensor by switching on and switching off the compressor.
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Citations
31 Claims
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1. A method of optimizing performance of a refrigeration device operated with a refrigerant and fed via an expansion valve, characterized in that:
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in addition to a supply air temperature, both a vaporization temperature and an air cooler outlet temperature at an outlet tube are measured and a first temperature difference value measured between said supply air temperature and said vaporization temperature is determined; said difference value is multiplied by a factor to provide a computed temperature value and said computed temperature value which is obtained is compared with a second temperature difference value measured between said air cooler outlet temperature at an outlet tube and said vaporization temperature to provide a comparison value; and the expansion valve at an inlet side of the refrigerator device is controlled responsive to said comparison value in such a way that said air cooler outlet temperature provides said second temperature difference value at least substantially the same as said computed temperature value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of operating a refrigeration device, comprising the steps of:
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determining a first difference temperature between an air supply temperature and a vaporization temperature; multiplying said first difference temperature by a predetermined factor to provide a computed temperature; determining a second difference temperature between an air cooler outlet temperature at an outlet tube and said vaporization temperature; comparing said computed temperature with said second difference temperature; and controlling an expansion valve of the refrigeration device to provide said second difference temperature at least about equal to said computed temperature. - View Dependent Claims (19, 20)
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21. A refrigerator, comprising:
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means for measuring a first temperature difference between and air inlet temperature of a refrigerator and a vaporization temperature of a refrigerant of said refrigerator; means, coupled to said first temperature measuring means, for computing a temperature value from said first temperature difference by multiplying said first temperature difference by a predetermined factor; means for measuring a second temperature difference between a vaporizer outlet temperature and said vaporization temperature; and means, coupled to said second temperature difference measuring means and to said computing means, for controlling a temperature of said refrigerant such that said second temperature difference approximately equals said computed temperature difference.
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22. Method of optimising the performance of refrigeration devices which are operated with a refrigerant and are fed via an expansion valve, in particular the performance of fan air refrigerators, in which, in addition to the air entry temperature or the supply air temperature (tL 1), both the vaporization temperature (tO) and also the temperature at the air refrigerator outlet (tOh) are measured continuously or periodically and the difference value (δ
- tl) between the supply air temperature (tL
1) and the vaporization temperature (tO) is determined, in which this difference value (δ
t1) is multiplied by a factor between 0.6 and 0.7, and the computed temperature value which is obtained is compared with the difference value (δ
toh) of the temperature at the air refrigerator outlet (toh), and the vaporization temperature (to), and in which the expansion valve (EV) at the inlet side of the air refrigerator is then controlled continuously or periodically in dependence on the result of the comparison in such a way that the temperature at the vaporizer outlet (tOh ) is at least substantially the same as the computed temperature value, characterized in that the difference value (δ
t1) between the supply air temperature (tL
1) and the vaporization temperature (tO) is monitored for the purpose of determining the ideal defrosting time point of the refrigeration device with respect to exceeding a predeterminable boundary value;
in that, in the case of exceeding this boundary value, a compressor and fan are switched off and a defrosting heating device is switched in until the air refrigerator has reached a predeterminable temperature corresponding to the ice-free state; and
in that the compressor is then switched on again and also the fan with a time delay relative to the compressor. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
- tl) between the supply air temperature (tL
Specification