Fouling monitoring apparatus of heat exchanger and method thereof
First Claim
1. An apparatus for monitoring a fouling resistance or a cleanliness factor of a heat-transfer surface, comprising:
- a fouling sensor for measuring an average temperature of heat-transfer surface as a resistance value of metal wire which is uniformly wound inside the heat-transfer surface;
an electrical resistance measuring means for measuring an electrical resistance of the metal wire;
a temperature measuring means for measuring water temperatures of inlet/outlet portions of the apparatus;
a flow rate measuring means for measuring the water flow rate flowing into the apparatus;
a data calculation means for computing a fouling resistance or a cleanliness factor of the heat-transfer surface with using analog output signals from the electrical resistance measuring means of the fouling sensor, the inlet/outlet water temperature measuring means and the water flow rate measuring means.
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Accused Products
Abstract
An apparatus for measuring a fouling resistance and a cleanliness factor of heat-transfer surface and which is capable of continuously and accurately monitoring a build-up degree of deposits on a heat-transfer surface of a heat exchanger includes a fouling sensor having a given length of metal wire wound inside the heat-transfer surface for measuring an average temperature of the heat-transfer surface, a direct current voltage supply member for supplying a voltage to a heating wire of the fouling sensor, an accurate resistance measuring member connected with a temperature measuring metal wire of the fouling sensor for measuring an electrical resistance of the metal wire, an inlet/outlet portion water temperature measuring member for measuring the temperatures of the inlet/outlet portions of the apparatus, a water flow rate measuring member, and a data calculation apparatus for computing a fouling resistance and a cleanliness factor of a heat-transfer surface.
38 Citations
10 Claims
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1. An apparatus for monitoring a fouling resistance or a cleanliness factor of a heat-transfer surface, comprising:
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a fouling sensor for measuring an average temperature of heat-transfer surface as a resistance value of metal wire which is uniformly wound inside the heat-transfer surface; an electrical resistance measuring means for measuring an electrical resistance of the metal wire; a temperature measuring means for measuring water temperatures of inlet/outlet portions of the apparatus; a flow rate measuring means for measuring the water flow rate flowing into the apparatus; a data calculation means for computing a fouling resistance or a cleanliness factor of the heat-transfer surface with using analog output signals from the electrical resistance measuring means of the fouling sensor, the inlet/outlet water temperature measuring means and the water flow rate measuring means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for measuring a fouling resistance or a cleanliness factor of a heat-transfer surface, comprising the steps of:
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disposing a metal wire having a high resistance temperature coefficient around a heat-transfer surface; measuring an electrical resistance variation of the metal wire; measuring an average temperature of a heat-transfer surface based on the electrical resistance value of the metal wire; and computing a fouling resistance or a cleanliness factor of the heat-transfer surface.
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10. An apparatus for monitoring scale build up on a heat transfer surface exposed to water flowing thereover which comprises:
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a housing defining an inlet and an outlet to enable water to flow therethrough, an inlet temperature-measuring means for measuring the temperature of water flowing into said housing, an outlet temperature-measuring means for measuring the temperature of water flowing out of said housing, a flow rate-measuring means for measuring the flow rate of water flowing through said housing, a fouling sensor located in said housing between said inlet and said outlet, said fouling sensor defining a heat-transfer surface and containing within said heat-transfer surface a coiled heating wire and a coiled metal wire, said coiled metal wire being located between said coiled heating wire and said heat-transfer surface, an electrical power supply means connected to said heating wire, a resistance-measuring means connected to said metal wire, and a data calculation means to which said inlet temperature-measuring means, said outlet temperature-measuring means, said flow rate-measuring means, said electrical power supply means and said resistance-measuring means are connected, said data calculation means computing scale built up on said heat transfer surface.
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Specification