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Heat Calculators

The Contrec Heat Calculators are popular among control and instrumentation engineers, offering a straightforward solution for measuring energy consumption in heating and cooling systems (including air conditioning) across various settings such as hospitals, residential apartment blocks, and commercial or industrial buildings.
These BTU meters/heat calculators from Contrec utilize flow readings from a wide range of flowmeters, along with temperature measurements from supply and return lines, to accurately determine the volume flow, energy, power, mass, and temperatures of the fluid being measured.
Operating in line with international metrology standards for accuracy, Contrec's heat calculators work with pulse or analog-generating flowmeters, including ultrasonic, electromagnetic, or traditional mechanical meters. By inputting temperature measurements from both the flow and return lines, these instruments can precisely calculate the fluid's volume flow, energy, power, mass, and temperatures.
Moreover, for applications involving specialized fluids with enhanced thermal properties, such as Glycol for anti-freeze or Therminol® heat transfer fluid for efficiency, Contrec's BTU energy calculators can accommodate these custom fluid properties, enabling precise measurements tailored to the specific process.


CONTREC 515 – HC01 – Heat Calculator - Frequency Flow (Volume)

The 515 HC01 application, which seems to be a versatile tool for measuring volume, mass, and energy content of fluid in heating or cooling systems. It's great that it offers compatibility with various flowmeter frequency outputs and supports different fluid types and modes, making it suitable for a wide range of applications.
The use of the IAPWS Industrial Formulation for water and internal enthalpy and density tables for other industry fluids indicates a robust approach to calculating mass flow and energy based on the specific characteristics of different fluids.
 

 

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CONTREC 515 – HC02 – Heat Calculator - Analogue Flow (Volume)

The 515 HC02 application shares similar functionalities with the 515 HC01 in terms of measuring volume, mass, and energy content of fluid in heating or cooling systems. The flexibility in selecting different fluid types and modes makes it suitable for various applications.
The ability to accommodate different flowmeter input signals such as 0-5V, 1-5V, or 4-20mA, along with the option to program minimum and maximum points and use non-linear correction points, reflects a high level of customization and adaptability to different flowmeter behaviors.
Just like the 515 HC01, the use of the IAPWS Industrial Formulation for water and internal enthalpy and density tables for other industry fluids indicates a robust approach to calculating mass flow and energy based on the specific characteristics of different fluids.
 

 

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CONTREC 515 – HC03 – Heat Calculator - DP Meter (Mass Span)

The 515 HC03 application is designed to measure the volume, mass, and energy content of fluid in heating or cooling systems using single or stacked differential pressure mass flow inputs in combination with feed and return temperature inputs.
Similar to the other applications, this one also offers a selection of fluid types and modes, making it suitable for diverse heating and cooling applications. The calculation of mass flow and energy is carried out according to the IAPWS Industrial Formulation for water, while internal enthalpy and density tables are utilized for other industry fluids, showcasing its adaptability to different fluid types.
The incorporation of specific conditions at which the flowmeter was calibrated ensures accurate measurements and reflects a commitment to precision in its operation.
 

 

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CONTREC 515 – HC04 – Heat Calculator for stacked DP meters (ISO 5167 and V-Cones)

The 515 HC04 application is designed to measure the volume, mass, and energy content of fluid in heating or cooling systems using single or stacked differential pressure flow inputs in combination with feed and return temperature inputs.
Similar to the other applications, this one also offers a selection of fluid types and modes, making it suitable for diverse heating and cooling applications. Notably, the flow calculation method is based on equations for ISO 5167 or V-Cone meters, ensuring accurate measurements and accounting for thermal expansion.
Moreover, the instrument's calculations are based on the IAPWS Industrial Formulation for the thermodynamic properties of steam, with temperature values used to determine density and specific enthalpy. Additionally, the instrument calculates the isentropic exponent and absolute viscosity, which are essential for the differential pressure calculations, showcasing its comprehensive approach to fluid measurement.
 

 

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CONTREC 515 – HC06 – Heat Calculator - DP Meter (Volumetric Span)

The 515 HC06 application is designed to measure the volume, mass, and energy content of fluid in heating or cooling systems using single or stacked differential pressure volumetric flow inputs along with feed and return temperature inputs.
Similar to the other applications, this one also provides a selection of fluid types and modes, making it suitable for various heating and cooling applications. The calculation of flow is performed according to generic differential pressure equations, while considering the conditions at which the flowmeter was calibrated, ensuring accuracy in its measurements.
Furthermore, when the fluid type is water, the instrument calculates the mass flow and energy according to the IAPWS Industrial Formulation (1997), whereas internal enthalpy and density tables are utilized for other industry fluids, demonstrating its versatility in handling different fluid types.
 

 

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CONTREC 515 – HC12 – Heat Calculator - Heat Calculator - Analogue Flow (Mass)

The 515 HC12 application, which is used to measure the volume, mass, and energy content of fluid in heating or cooling systems. It utilizes an analog mass flow input along with analog feed and return temperature inputs. The flexibility to select from a range of fluid types and modes makes it suitable for various heating and cooling applications.
Additionally, the flowmeter input signal can be chosen as 0-5V, 1-5V, or 4-20mA. The device allows for programming minimum and maximum points, and it can utilize non-linear correction points to better represent the flowmeter's behavior.
When the fluid type is water, the instrument calculates mass flow and energy according to the IAPWS Industrial Formulation (1997).
 

 

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CONTREC 212 – Heat Calculator

The 212 is quite versatile as it comes complete with temperature probes and is designed to interface with a variety of flowmeters. These include positive displacement and inferential water meters, magnetic flowmeters with pulse outputs, as well as turbine and paddle wheel flowmeters. This flexibility makes it suitable for a wide range of applications
 
 

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