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Summary of Contents for Hukseflux HFP01
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Page 1: User Manual
HFP01 & HFP03 Heat Flux Plate Heat Flux Sensor USER MANUAL HFP01/ HFP03 manual version 0612 Edited & Copyright by: Hukseflux Thermal Sensors http://www.hukseflux.com e-mail: info@hukseflux.com... -
Page 2: Table Of Contents
Installation of HFP01 in building physics Maintenance of HFP01 Electrical connection of HFP01 Appendices 11.1 Appendix on cable extension for HFP01 11.2 Appendix on trouble shooting 11.3 Appendix on heat flux sensor calibration 11.4 Appendix on heat transfer in meteorology 11.5 Appendix on heat transfer in building physics... -
Page 3: List Of Symbols
Subscripts Property of the sensor Property of air Property during calibration Property of the object on which HFP01 is mounted Property at the soil surface surf H F P 0 1 / H F P 0 3 m a n u a l v e r s i o n 0 6 1 2... -
Page 4: Introduction
By using a ceramics-plastic composite body the total thermal resistance is kept small. HFP01 serves to measure the heat that flows through the object in which it is incorporated or on which it is mounted. The actual sensor in HFP01 is a thermopile. This thermopile measures the differential temperature across the ceramics-plastic composite body of HFP01. - Page 5 H u k s e f l u x T h e r m a l S e n s o r s Figure 1 Drawing of HFP01 sensor Figure 2 HFP01 heat flux plate dimensions: (1) sensor area, (2) guard of ceramics-plastic composite, (3) cable, standard length is 5 m.
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Page 6: General Theory
H u k s e f l u x T h e r m a l S e n s o r s 1 General Theory General heat flux sensor theory As in most heat flux sensors, the actual sensor in HFP01 is a thermopile. This thermopile measures the differential temperature across the ceramics-plastic composite body of HFP01. - Page 7 The two different alloys are represented in different colours 1 and 2. The thermopile is embedded in a filling material, usually a plastic, in case of HFP01 a special Ceramics- plastic composite. Each individual sensor will have its own...
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Page 8: Detailed Description Of The Measurement: Resistance Error, Contact Resistance, Deflection Error And Temperature Dependence
H u k s e f l u x T h e r m a l S e n s o r s Detailed description of the measurement: resistance error, contact resistance, deflection error and temperature dependence As a first approximation, the heat flux is expressed as: ϕ... - Page 9 The result of these experiments is laid down as the so-called thermal conductivity dependence E . The order of magnitude of E λ λ constant for one sensor type. For HFP01, E is given in the list of λ specifications. (1+E (λ...
- Page 10 H u k s e f l u x T h e r m a l S e n s o r s Figure 1.2.3 The deflection error. The heat flux (1) is deflected in particular at the edges of the sensor. As a result the measurement will contain an error;...
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Page 11: Application In Meteorology
Users should be aware of the fact that the soil heat flux measurement with HFP01 in most cases is not resulting in a high accuracy result. The main causes are: 1 the fact that measurement at one location in the soil will have only limited validity for a larger area;... - Page 12 A typical HFP01 has a thermal conductivity of 0.8 W/mK, while soils can vary between extremes of 0.2 and 4 W/mK.
- Page 13 See the appendix for more details. Summary: In case of use of HFP01 in meteorological applications, the use of 2 sensors per station is recommended. This creates redundancy and a better possiblity for judging the quality of the measurement accuracy.
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Page 14: Application In Building Physics
In a perfect environment, the initial calibration accuracy of heat flux sensors is estimated to be +3 /- 3%. In case of use of HFP01 on walls (insulating as well as bricks and cements) the overall expected measurement accuracy for 12 hr totals is +5 / -5 %. - Page 15 H u k s e f l u x T h e r m a l S e n s o r s In case of analysis of thermal resistance of building envelopes, the minimum recommended measurement time is 48 hours. Hukseflux also offeres a complete measurement system for analysis of building envelopes: TRSYS. Figure 3.1 Estimation of convective, radiative and conductive heat flux in building physics.
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Page 16: Specifications Of Hfp01
H u k s e f l u x T h e r m a l S e n s o r s 4 Specifications of HFP01 HFP01 is a heat flux sensor that measures the local heat flux perpendicular to the sensor surface in the medium in which it is incorporated or the object on which it is mounted. - Page 17 Low thermal resistance walls require correction for the resistance error. Table 4.1 List of HFP01 specifications. (started on previous page, continued on next page) H F P 0 1 / H F P 0 3 m a n u a l v e r s i o n 0 6 1 2...
- Page 18 5m), AC100 amplifier, LI 18 hand held readout, extended temperature range Table 4.1 List of HFP01 specifications. (started on previous 2 pages) H F P 0 1 / H F P 0 3 m a n u a l v e r s i o n 0 6 1 2...
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Page 19: Short User Guide
H u k s e f l u x T h e r m a l S e n s o r s 5 Short user guide Preferably one should read the introduction and first chapters to get familiarised with the heat flux measurement and the related error sources. -
Page 20: Putting Hfp01 Into Operation
Table 6.1 Checking the functionality of the sensor. The procedure offers a simple test to get a better feeling how HFP01 works, and a check if the sensor is OK. The programming of data loggers is the responsibility of the user. -
Page 21: Installation Of Hfp01 In Meteorology
H u k s e f l u x T h e r m a l S e n s o r s 7 Installation of HFP01 in meteorology HFP01 is generally installed at the location where one wants to measure at least 4 cm depth below the surface. A typical depth of installation is 5 cm. -
Page 22: Installation Of Hfp01 In Building Physics
H u k s e f l u x T h e r m a l S e n s o r s 8 Installation of HFP01 in building physics HFP01 is generally installed on the surface of a wall, or alternatively it is integrated into the wall. Typically 2 sensors are used per measurement location in order to promote spatial averaging, and to have some redundancy for improved quality assurance. - Page 23 Independent attachment of the cable can be done to an object that can resist strain in case of accidental force. HFP01 sensors can be put electrically in series to create a sensor with higher sensitivity of better spatial resolution using only one single readout channel.
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Page 24: Maintenance Of Hfp01
In case of use in building physics, re-calibration can be done in the field by monting a second “reference” HFP01 on top of the “field” sensor, and by measuring the ratio of the outputs over a longer time. - Page 25 H u k s e f l u x T h e r m a l S e n s o r s Requirements for data acquisition / amplification Capability to measure Preferably: 5 microvolt accuracy microvolt signals Minimum requirement: 50 microvolt accuracy (both across the entire expected temperature range of the...
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Page 26: Electrical Connection Of Hfp01
A typical connection is shown in table 11.1. HFP01 is a passive sensor that does not need any power. Cables generally act as a source of distortion, by picking up capacitive noise. It is a general recommendation to keep the distance between data logger or amplifier and sensor as short as possible. -
Page 27: Appendices
H u k s e f l u x T h e r m a l S e n s o r s 11 Appendices 11.1 Appendix on cable extension for HFP01 HFP01 is equipped with one cable. It is a general recommendation to keep the distance between data logger or amplifier and sensor as short as possible. Cables generally act as a source of distortion, by picking up capacitive noise. -
Page 28: Appendix On Trouble Shooting
3 Check the condition of the sensor cable. Table 11.2.1 Trouble shooting for HFP01. H F P 0 1 / H F P 0 3 m a n u a l v e r s i o n 0 6 1 2... -
Page 29: Appendix On Heat Flux Sensor Calibration
The method that is generally applied during production is described below. Figure 12.3.1 The calibration method for HFP01; a heat flux sensor (2) is calibrated by mounting it on a metal heat sink (1) with a constant temperature. A film heater (3) is used to generate a well known heat flux. -
Page 30: Appendix On Heat Transfer In Meteorology
H u k s e f l u x T h e r m a l S e n s o r s 11.4 Appendix on heat transfer in meteorology Note: All units used in this appendix are clarified in the text. Not all units in this appendix are mentioned in the list of symbols. - Page 31 H u k s e f l u x T h e r m a l S e n s o r s S = (T ). C .d / (t 11.4.2 Where S is the storage term, T is the temperature change in the measurement interval, C the volumetric heat capacity, d the depth of installation of the soil heat flux sensors, t...
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Page 32: Appendix On Heat Transfer In Building Physics
H u k s e f l u x T h e r m a l S e n s o r s 11.5 Appendix on heat transfer in building physics Note: All units used in this appendix are clarified in the text. Not all units in this appendix are mentioned in the list of symbols. -
Page 33: Appendix On Hfp03
0.8 kg m cable Table 11.6.1 Differences between HFP01 and HFP03 H F P 0 1 / H F P 0 3 m a n u a l v e r s i o n 0 6 1 2 p a g e 3 3 / 3 5... - Page 34 H u k s e f l u x T h e r m a l S e n s o r s Figure 11.6.1 HFP03 heat flux plate dimensions: (1) sensor area, (2) guard of ceramics-plastic composite, (3) cable, standard length 5 m. All dimensions are in mm. H F P 0 1 / H F P 0 3 m a n u a l v e r s i o n 0 6 1 2 p a g e 3 4 / 3 5...
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Page 35: Ce Declaration Of Conformity
11.7 CE declaration of conformity According to EC guidelines 89/336/EEC, 73/23/EEC and 93/68/EEC Hukseflux Thermal Sensors Declare that the products: HFP01 and HFP03 Is in conformity with the following standards: Emissions: Radiated: EN 55022: 1987 Class A Conducted: EN 55022: 1987 Class B Immunity: ESD IEC 801-2;...
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