公开(公告)号：WO2009039850A1

公开(公告)日：2009-04-02

申请号：PCT/DK2008/000333

申请日：2008-09-24

Applicant: DANFOSS A/S ,  ALNOR, Harald ,  BENDTSEN, Christian

Inventor： ALNOR, Harald ,  BENDTSEN, Christian

IPC: F25B49/02

CPC classification number: F25B41/062 ,  F25B49/022 ,  F25B2500/18 ,  F25B2500/19 ,  F25B2600/21 ,  F25B2600/2513 ,  F25B2700/21172 ,  F25B2700/21173 ,  F25B2700/21174 ,  F25B2700/21175

Abstract: A method for controlling an opening degree of a valve arranged in a vapour compression system, such as a refrigeration system or a heat pump. The vapour compression system comprises a compressor, a condenser, a valve and an evaporator arranged in a refrigerant flow path. According to a first aspect, the method comprises the steps of obtaining a superheat value for the system and comparing it to a reference superheat value, determining a maximum opening degree of the valve, and controlling the opening degree of the valve in accordance with the comparing step, and in such a manner that the opening degree does not exceed the maximum opening degree. The maximum opening degree is determined dynamically as a function of a mean temperature difference across the evaporator. Thereby the it is ensured that it is possible to open the valve as much as possible, while keeping the operation of the system safe in the sense that the risk that liquid refrigerant is allowed to pass through the evaporator is minimised due to the maximum opening degree. According to a second aspect, an adjustment value is calculated on the basis of the superheat value, the reference superheat value and a generated control signal. Thereby a faster response to changes in the operating conditions for the vapour compression system is obtained.

Abstract translation: 一种用于控制配置在诸如制冷系统或热泵的蒸气压缩系统中的阀的开度的方法。 蒸气压缩系统包括布置在制冷剂流动路径中的压缩机，冷凝器，阀和蒸发器。 根据第一方面，所述方法包括以下步骤：获得所述系统的过热值并将其与参考过热值进行比较，确定所述阀的最大开度，以及根据所述比较来控制所述阀的开度 并且以使开度不超过最大开度的方式。 最大开度作为蒸发器两端平均温度差的函数动态地确定。 从而确保尽可能地打开阀，同时保持系统的操作安全，因为允许液体制冷剂通过蒸发器的风险由于最大开度而被最小化 。 根据第二方面，基于过热值，参考过热值和产生的控制信号来计算调整值。 从而获得对于蒸汽压缩系统的操作条件的变化的更快响应。

公开(公告)号：WO2004036170A1

公开(公告)日：2004-04-29

申请号：PCT/DK2003/000701

申请日：2003-10-14

Applicant: DANFOSS A/S ,  THYBO, Claus ,  BENDTSEN, Christian

Inventor： THYBO, Claus ,  BENDTSEN, Christian

IPC: G01M19/00

CPC classification number: B60H1/00978 ,  B60H1/3227 ,  F25B49/005 ,  F28B11/00 ,  F28F27/00 ,  F28F2200/00 ,  G01M99/002

Abstract: A method and a device for detecting an abnormality of a heat exchanger exchanging heat between a first fluid flow flowing in a conduit and a second fluid flow flowing along a flow path, said conduit and said flow path each having an inlet and an outlet, whereby the method comprises the steps of: establishing at least one parameter representative of the temperature conditions of the heat exchanger, establishing a second fluid inlet temperature, establishing a parameter indicative of expected heat exchange between the heat exchanger and the second fluid, processing the heat exchanger temperature, the second fluid temperature and the parameter indicative of expected heat exchange for establishing an estimated second fluid outlet temperature, employing the estimated second fluid outlet temperature for evaluating the heat exchange between the first and second fluids by comparing the estimated second fluid outlet temperature, or a parameter derived therefrom, with a reference value.

Abstract translation: 一种用于检测热交换器在管道中流动的第一流体流与沿流动路径流动的第二流体流之间交换热量的异常的方法和装置，所述导管和所述流路各自具有入口和出口，由此 该方法包括以下步骤：建立代表热交换器的温度条件的至少一个参数，建立第二流体入口温度，建立指示热交换器和第二流体之间预期热交换的参数，处理热交换器 温度，第二流体温度和指示预期热交换的参数，用于建立估计的第二流体出口温度，采用估计的第二流体出口温度来评估第一和第二流体之间的热交换，通过比较估计的第二流体出口温度， 或由其导出的参数，具有参考值。