All Applications
Thermal Energy Measurement

BTU Energy Measurement Systems

Measure flow and the associated energy consumed or transferred across hot and chilled water, steam, natural-gas and other industrial energy systems.

Heating and Cooling Steam Energy Performance Verification
Cadillac Meter CMAG installed with temperature sensors in a hydronic BTU energy system
Cadillac Meter CMAG shown with temperature instrumentation in a hydronic BTU energy system.
Measurement Principle

How a BTU Energy System Works

In a hot or chilled water system, thermal energy measurement depends on three coordinated inputs: the volume of liquid moving through the system, the supply temperature and the return temperature.

The energy computer uses the measured flow and temperature difference to calculate the energy transferred or consumed. The accuracy of the complete result therefore depends on the flow meter, temperature sensors and energy calculation working together as one system.

Application distinction: Hot and chilled water systems normally calculate energy from liquid flow and the difference between supply and return temperatures. Steam and natural-gas energy applications require measurement systems configured for the properties and operating conditions of those media.

Measurement Accuracy

Accuracy Depends on the Complete Energy System

As energy costs rise and performance-verification requirements become more demanding, reliable measurement becomes increasingly important. A BTU system cannot be judged by the energy computer alone: each measurement component contributes to the final result.

Flow Measurement

The flow meter establishes how much carrier medium moves through the energy system.

Temperature Sensing

Precision-matched temperature assemblies measure the supply and return conditions.

Energy Computation

The energy computer converts the measured inputs into totalized energy information.

System Integration

Correct sizing, sensor placement and installation allow the components to operate as one system.

The Practical Outcome

Reliable energy data for performance verification, usage allocation, billing and conservation planning.

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Application Options

Energy Measurement by Carrier Medium

The appropriate BTU or energy measurement system depends first on the medium carrying the energy. Cadillac Meter provides dedicated approaches for liquid-based heating and cooling systems, saturated steam, superheated steam and natural gas.

Liquid Carrier Media

Hot and Chilled Water

Measure liquid flow together with matched supply and return temperatures to calculate heating or cooling energy.

Available system families

HEATX-2, HEATX, Energy CU-E and compact CU-TE energy systems.

Steam Energy

Saturated Steam

Measure saturated-steam flow and energy where steam is used as the process or heating medium.

Available system family

CDIS energy flow stations for saturated-steam energy measurement.

Mass and Energy

Superheated Steam and Natural Gas

Use an energy system configured to measure mass flow and energy consumption under the operating conditions of steam or gas service.

Available system family

Energy CMASS systems for superheated-steam and natural-gas applications.

Selection note: These system families are not interchangeable. Carrier medium, expected flow, temperature, pressure and the required energy calculation must be confirmed before selecting a product.

Selection Guidance

Information Needed to Select a BTU System

Selecting an energy measurement system requires more than matching a meter to the existing pipe diameter. The complete operating range and the intended use of the data must be considered together.

Supplying accurate application information allows the flow meter, sensing components and energy computer to be configured as a coordinated measurement system.

01 Carrier Medium

Identify hot water, chilled water, saturated steam, superheated steam, natural gas or another medium.

02 Measurement Objective

Define whether the data will support billing, allocation, performance verification or system monitoring.

03 Flow Conditions

Provide minimum, normal and maximum flow rather than relying only on nominal pipe size.

04 Temperature and Pressure

State normal and maximum operating temperature and pressure conditions.

05 Installation Details

Confirm pipe size, material, available straight run, sensor locations and installation space.

06 Data and Integration

Identify display, totalization, archiving, output and building-control integration requirements.

Cadillac Meter can review these conditions and help determine which energy-system family and measurement technology suit the application.

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Available Solutions

BTU and Energy Measurement Systems

Explore Cadillac Meter systems for hot and chilled water, saturated steam, superheated steam and natural-gas energy measurement. Open any product to review its operating principle, specifications, installation requirements and technical resources.

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