Wednesday, July 17, 2019

Energy Metering Through Flow Measurement in District Energy Systems

Energy Metering in District Energy

Modern power plants operate according to the environmentally friendly principle of combined heat and power (CHP), where electricity and heat are generated in a single process. Combined heat and power utilizes wasted heat from electric generation to increase the efficiency of power plants. In many cities the heat is transported in the form of hot water via pipelines to the respective districts. Implementation of CHP is often driven by reliability requirements for critical facilities such as hospitals, data centers, or research labs. Flow and thermal energy metering at these pipelines is crucial for fulfilling their safety functions in case of necessary line shut downs, as well as for network balancing and pump regulation.

Energy Metering in District EnergyWhether you are running an entire facility, optimizing a central power plant or developing a plant for the next expansion of your campus, precise measurement of existing utilities is essential in making the choices necessary to operate your present scheme or designing for future needs. Accurate flow measurement starts with the selection of the correct technology for the implementation, the correct installation of the meter and controllers, with the return of the data to the building automation system (BAS) and energy management software (EMS).

Goals for an Efficient Energy Metering Scheme
  • Reduce energy costs
  • Measure energy use
  • Improve reliability of system
  • Improve space conditions
KEP Flow Computer
KEP Flow Computer
The flowmeter and flow computer are ideal for metering energy consumption in heated / chilled water and steam applications, and are often teamed together to provide an accurate system that provides mass flow information, corrects volume flow, and computes heat flow. This data is then provided to the BAS/EMS for further analysis.

A flow computer is a special purpose device which computes a corrected flow based on information derived from raw input signals and stored sensor and fluid properties information.

A number of flow metering devices are available, each having strengths and weaknesses in connection with specific applications. The types include:
Many of these flow sensors require linearization from the flow computer to improve accuracy. The flow computer is also used for data logging, communication, remote metering, alarming and control functions.

New standards require that measurement devices be installed to monitor the electrical energy use for total energy used for heating, ventilating, and air-conditioning (HVAC) systems. Working with experts who fully understand the accuracy, reliability, and affordability of the flow metering equipment is critical to a successful implementation.

For more information, contact Flow-Tech, Inc. by calling 410-666-3200 in Maryland or 804-752-3450 in Virginia. Or, stop by the website at https://flowtechonline.com.