Go to GlobalSpec.com Home
Toolbar   The Engineering Toolbar
The Ultimate Resource for Engineering and Technical Research. (Learn More)

Quantifying Heat Losses from Buried District Heating Piping via Infrared Thermography

From Flir Systems Incorporated
 

 
We have known for some time that surface temperature measurements via infrared thermography could find problem areas in the buried piping of district heating systems. While such information is useful for locating areas of major failures, for planning purposes some quantification of the results is needed. Some progress has been made towards this end by two International Energy Agency (IEA) District Heating projects (Jönsson and Zinko, 1993, and Zinko et al., 1996). The objective of these projects was to develop a method that would allow quantification of heat losses from the temperature profile of the ground's surface above the buried heat distribution pipeline. Basically, the method uses the integral of the temperature distribution at the ground's surface along with climatological and system data to get an empirical estimate of the heat loss. The IEA projects developed and proposed several models that correlated heat loss from buried district heating pipes to the temperature distribution at the ground surface above those pipes.
Product Announcements
Heraeus Noblelight, Inc. - Infrared Heaters for Plastic Staking & Welding
Infrared Welding & Heat Staking Infrared Heaters and Systems for Infrared Welding can be a beneficial replacement for certain traditional hot-plate and vibration welding applications. The use of a... (read more)
Vibration Specialty Corporation - Infrared Thermography Services
Regular periodic inspections drastically reduce unexpected failures and downtime by detecting abnormal temperature patterns that may signify corrosion, damag wiring, loose connections, and/or... (read more)
Heraeus Noblelight, Inc. - Fast Medium Wave Infrared Heater
Fast Medium Wave infrared Heaters transfer large amounts of energy in a short time. Infrared heaters from Heraeus work well with thin foils and large surface areas, and solid, small, or complex... (read more)
Glenro Inc. - Gas Infrared Systems
Rapid response process performance is what you can expect with our gas infrared system designs. Glenro Radplane® Rapid Response Gas Infrared heater technologies provide process flexibility and... (read more)
CCI Thermal Technologies Inc. - Cata-Dyne™ Cata-Fan™ Forced Convection Fan
The Cata-Fan™ enhances the space heating performance of our industry-leading Cata-Dyne™ Infrared Gas Catalytic Heaters by adding forced convection capabilities, promoting uniform heat... (read more)
Spence Engineering Company, Inc. - Type ED Series Pressure Regulator
CAST IRON or STEEL- PRESSURES to 600 PSIG at 750°F... (read more)
Heraeus Noblelight, Inc. - Medium Wave Infrared Heater
Medium wave Infrared heater for plastics, water and other solvents absorb medium wave radiation especially well. The use of medium wave infrared heaters helps in the effective drying of paints and... (read more)
Heraeus Noblelight, Inc. - Fast Medium Wave Infrared Heaters
Fast Medium Wave Infrared Heaters from Heraeus Noblelight feature exceptional stability and high power density. Fast response medium wave IR heaters can be supplied in all lengths up to around 6m. (read more)
Topics of Interest
In East Germany, there are many old factory buildings which were built in an era where thermally insulating buildings and equipment was not regarded as particularly important. Meanwhile, rising energy... (Read More)
There has been little discussion about infrared ("IR") thermography's ability to determine the temperatures of heating liquids and gas within piping assemblies. Determining accurate emissivity values... (Read More)
There are many applications where thermal thermography is really helpful, for instance: Determination of external surface temperatures in the building, which will allow for the analysis of heat... (Read More)
Plastics piping can be joined by different methods (see Table D1.8) depending on the characteristics of the material. For example, ABS, PVC, and CPVC can be solvent cemented. However, polyolefins... (Read More)
In September of 2006, the Central Kitchen for Puyallup School District (henceforth, PSD), in Puyallup, Washington experienced a heaving failure with a concrete freezer slab. The slab had risen to a... (Read More)