DE442029C - Device for electrical measurement of the amount of heat supplied or removed by a flowing substance, consisting of two electrical resistance meters located in front of and behind the heat transfer point - Google Patents

Device for electrical measurement of the amount of heat supplied or removed by a flowing substance, consisting of two electrical resistance meters located in front of and behind the heat transfer point

Info

Publication number
DE442029C
DE442029C DEF57348D DEF0057348D DE442029C DE 442029 C DE442029 C DE 442029C DE F57348 D DEF57348 D DE F57348D DE F0057348 D DEF0057348 D DE F0057348D DE 442029 C DE442029 C DE 442029C
Authority
DE
Germany
Prior art keywords
amount
heat
behind
electrical
heat transfer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEF57348D
Other languages
German (de)
Inventor
Dr Karl Boedeker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEF57348D priority Critical patent/DE442029C/en
Application granted granted Critical
Publication of DE442029C publication Critical patent/DE442029C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K17/00—Measuring quantity of heat
    • G01K17/06—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device
    • G01K17/08—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device based upon measurement of temperature difference or of a temperature
    • G01K17/10—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device based upon measurement of temperature difference or of a temperature between an inlet and an outlet point, combined with measurement of rate of flow of the medium if such, by integration during a certain time-interval
    • G01K17/12—Indicating product of flow and temperature difference directly or temperature
    • G01K17/16—Indicating product of flow and temperature difference directly or temperature using electrical or magnetic means for both measurements

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Description

Einrichtung zur elektrischen Messung der von einem strömenden Stoff zu- oder abgeführten Wärmemenge, bestehend aus zwei vor und hinter der Wärmeumsatzstelle liegenden elektrischen Widerstandsmessern. Um die von einem Wärme übertragenden, strömenden Stoff einem andern Körper übermittelte Wärmemenge angeben zu können, ist es erforderlich, jeweils das Produkt aus der Temperaturdifferenz des Wärmeträgers vor und nach Durchströmen der Wärmeumsatzstelle und der gleichzeitig strömenden Menge zu kennen. Die Lösung der Aufgabe ist beispielsweise wichtig für Warmwasserheizungen, aber auch für Kühlanlagen mit Wasser- oder Kühllaugedurchfluß.Device for the electrical measurement of a flowing substance Heat quantity supplied or removed, consisting of two in front of and behind the heat conversion point lying electrical ohmmeters. In order to transfer heat from a, to be able to indicate the amount of heat transferred to another body in the flowing substance, it is necessary to calculate the product of the temperature difference of the heat transfer medium before and after flow through the heat conversion point and the simultaneously flowing Amount to know. The solution to the task is important for hot water heating systems, for example, but also for cooling systems with water or cooling liquor flow.

Es ist bekannt, diese Aufgabe in der Weise mittels .elektrischer Meßgeräte zu lösen, daß unter Verwendung einer Stromquelle von konstanter Spannung durch « einen Flüssigkeitsmesser Widerstände in den Stromkreis des Widerstandsthermometers geschaltet werden,. so daß die Anzeige eines Meßinstrumentes so-. wohl der durchströmenden Flüssigkeitsmenge als auch der Differenz der Temperaturen in Zu und Ablauf des Wärmeträgers proportional ist. Nach diesen früheren Vorschlägen soll eine in ihrer Höhe von der Strömung beein-$ußte Quecksilbersäule Widerstände, die in die Zuleitung zum Widerstandsthermometer eingebaut sind, teilweise kurz schließen. Die praktische Ausführung derartiger Anordnungen stößt auf grundsätzliche und erfahrungsgemäß unvermeidliche Schwierigkeiten. Zunächst ist eine gleichstufige und proportionale Veränderung eines Stromes von Null bis zu einem Höchstwert durch Vorschaltwiderstän:de grundsätzlich nicht erreichbar. Außerdem aber sind bei Quecksilberkontaktstellen störende übergangswiderstände technisch unvermeidlich. Schließlich ist die ganze Meßanordnung ihrem Wesen nach nur für Durch$ußmengenmesserbrauchbar. Die übertragung auf Schwimmermesser ist nicht möglich oder wenigstens ohne praktische Bedeutung.It is known to do this by means of electrical measuring devices to solve that using a current source of constant voltage through « a liquid meter resistances in the circuit of the resistance thermometer be switched. so that the display of a measuring instrument so-. well the amount of liquid flowing through as well as the difference in temperatures in The inlet and outlet of the heat transfer medium is proportional. According to these earlier proposals should a mercury column, whose height is influenced by the flow, have resistances, which are built into the supply line to the resistance thermometer, partially short-circuit. The practical implementation of such arrangements encounters fundamental and experience inevitable difficulties. First is an equal and proportional Change of a current from zero to a maximum value by means of series resistors generally not available. In addition, there are mercury contact points disturbing contact resistances are technically unavoidable. Finally the whole The nature of the measuring arrangement is only usable for flow meters. The transfer on float knife is not possible or at least of no practical importance.

Gemäß vorliegender Erfindung werden diese Schwierigkeiten dadurch vermieden, daß man zur Messung der strbanenden Menge des Wärme ,-trägers eine Wheatstonesche Brücke anwendet. Dies geschieht nach der Abbildung beispielsweise so, daß in der Brücke 3 Wider= stände fest sind, während der vierte Wider= stand verstellbar eingerichtet wird, wobei die' Verstelivorric'htung von dem nicht dargestellten Mengenmesser betätigt wird. Die Widerstände können so gewählt werden, daß die an den Punkten C und D abgreifbare Spannung der durchgießenden Menge des Wärmeträgers proportional ist. Diese so veränderliche Meßspannung dient zum Betriebe einer, zweiten Wheatstoneschen Brücke, in der T1 und T2 zwei Widerstandsthermometer, W1 -und W2 zwei feste Widerstände bedeuten. Das Ableseinstrument Gr gibt alsdann einen Ausschlag, der proportional dem Produkt aus strömender Menge und seiner Temperaturdifferenz im "Vorlauf und Rücklauf ist. Statt des Ablesegerätes kann auch ein Registriergerät dienen, so daß die Planimetrierung des von. ihm aufgezeichneten Diagrammes über eine bestimmte Zeit die insgesamt während dieser Zeit von dem Wärmeträger abgegebene oder aufgenommene Wärmemenge darstellt.In accordance with the present invention, these difficulties are eliminated avoided the need to use a Wheatstone ash to measure the amount of heat, heat carrier Bridge applies. This is done according to the figure, for example, so that in the Bridge 3 resistors are fixed, while the fourth resistor is adjustable is, the 'adjustment device' operated by the flow meter, not shown will. The resistances can be chosen so that those at points C and D can be tapped off Voltage is proportional to the amount of heat carrier pouring through. This so changeable one Measurement voltage is used to operate a second Wheatstone bridge in T1 and T2 are two resistance thermometers, W1 and W2 are two fixed resistances. The reading instrument Gr then gives a reading that is proportional to the product from the flowing volume and its temperature difference in the "flow" and "return". Instead of the reading device, a recording device can also be used, so that the planimetry of. it recorded diagram over a certain time the total during this time represents the amount of heat given off or absorbed by the heat transfer medium.

Claims (1)

PATENTANSPRUCH: Einrichtung zur elektrischen Messung der von einem strömenden Stoff zu- oder abgeführten Wärmemenge, bestehend aus zwei vor und hinter der Wärmeumsatzstelle liegenden elektrischen Widerstandsthermometern, welche in zwei Zweigaa einer Wheatstoneschen Brücke liegen, dadurch gekennzeichnet, daß der Mengenmesser des Stoffes einen oder mehrere der Widerstände der einen Brücke (Bl) so beeinflußt, daß die Brückenspannung proportional zur Strömungsmenge wird und, ,als Stromquelle für die andere die Temperaturmeßwiderstände (T1, T2) enthaltende Wheatstonesche Brücke (B2) dient. Claim: Device for the electrical measurement of the amount of heat supplied or removed by a flowing substance, consisting of two electrical resistance thermometers in front of and behind the heat conversion point, which are in two branches of a Wheatstone bridge, characterized in that the flow meter of the substance has one or more of the Resistances of one bridge (B1) influenced so that the bridge voltage is proportional to the flow rate and,, serves as a power source for the other Wheatstone bridge (B2) containing the temperature measuring resistors (T1, T2).
DEF57348D 1924-11-15 1924-11-15 Device for electrical measurement of the amount of heat supplied or removed by a flowing substance, consisting of two electrical resistance meters located in front of and behind the heat transfer point Expired DE442029C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF57348D DE442029C (en) 1924-11-15 1924-11-15 Device for electrical measurement of the amount of heat supplied or removed by a flowing substance, consisting of two electrical resistance meters located in front of and behind the heat transfer point

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF57348D DE442029C (en) 1924-11-15 1924-11-15 Device for electrical measurement of the amount of heat supplied or removed by a flowing substance, consisting of two electrical resistance meters located in front of and behind the heat transfer point

Publications (1)

Publication Number Publication Date
DE442029C true DE442029C (en) 1927-03-17

Family

ID=7108244

Family Applications (1)

Application Number Title Priority Date Filing Date
DEF57348D Expired DE442029C (en) 1924-11-15 1924-11-15 Device for electrical measurement of the amount of heat supplied or removed by a flowing substance, consisting of two electrical resistance meters located in front of and behind the heat transfer point

Country Status (1)

Country Link
DE (1) DE442029C (en)

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