udvikling af markedsfremmende værktøjer og best practice
Contents
1. FORE WORD ne 3 AC KNOW EF DOP MENTS aon eh 4 TRON e a ern E E E A E een 5 L SNZERODURHON zes ee nee 6 2 DESCRIPTION OF THE EQUIPMENT euere ei 7 3 PROCEDURE TORRECUEEN TRI see ee 11 3 1 Measurement of Undisturbed Ground Temperature oocccccncccnnnnnnnnnnnnnnonononanonononcnnnnnos 12 3 1 1 Equipment 1 thermometer with taped cable 00000 essen 12 3 1 2 Equipment 2 Hydrotechnik Water Meter oooooonnnnncnnnnnnnnnnnnnnnnnnnnnnnnnonononoss 14 32 Cleaning he BHE before the TRI een 15 33 Preparing parameters for the PRT ee een ne 17 3 SWUM BP AAA ee 19 34 1 CC Ce lit ee ee 19 342 PR are 19 3 4 3 Connect the hoses to the BHE ee 20 3 4 4 Connect to the power and start the pump occccccnnnnnnnnnnnonononononononononononanininnnos 20 345 Start recording Aal rial 21 3 4 6 Set the heater temperature and start the TRT eeeeen 21 33 Dina TRE aaa 22 36 AA N 22 3 7 UAE DER HO RO data nn enn nr Pe RE en 22 4 REFERENCES ee De nee rein lata cenando 21 D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEQENERGY Closed loop boreholes knowledge tools and best practice FOREWORD Heat pump systems based on closed loop geothermal boreholes has a potential for CO2 reduction and energy efficiency The application in Denmark however s limited compared to our neighbouring countries and we still lack know how and experience The objec2. A being A the surface of the pipe section 0 001002 Pars at 20 C Test length Following the international guidelines established n Geotrainet 1 and the advices by Gehlin 2 at least 48 50 hours long tests must be performed Considered borehole depth Realize that corrections are required to consider the depth affected by the ambient conditions or the superficial layers However in order to simplify the calculations all the borehole length could be considered Preparing for data collection The measurement devices need to be configured following the user manuals Testo 176T4 This is the device for the temperature data logs The software Testo Comfort Basic 5 0 should be downloaded for the computer from http www testo com download center The program is used to configure and retrieve the data from the 176T4 D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 17 GEQENERGY Closed loop boreholes knowledge tools and best practice The input canals are set channel 1 Tin inlet temperature to the BHE warm water channel 2 Tout outlet temperature from the BHE colder water channel 3 Theater temperature of the heater and channel 4 Tambient ambient temperature In order to connect the data logger to the computer for the parameter set up an ordinary USB connection cable will be required Burkert 8619 This is the unit for the flow data logs The mult
3. Insulation for the pipes Yellow tent Submersible pump Check the place where the test is going to be done Is there enough space to place the equipment Do we have a tri phasic connection 3 4 2 Place the equipment The TRT equipment has to be placed as close as possible to the BHE in order to reduce the length of the connection pipes Either these connection pipes or the pipes coming out from the BHE have to be insulated with insulating foam Besides in order to protect the equipment an impermeable tent is recommended to be mounted covering the test rig Fig 3 7 Be aware that the borehole is full of water before the equipment is connected D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEQENERGY Closed loop boreholes knowledge tools and best practice Fig 3 7 a TRT equipment and insulated connection pipes b TRT equipment already connected and placed inside the protection tent 3 4 3 Connect the hoses to the BHE Consider the direction of the water flow and do the connection using the appropriate tools Be aware that the borehole is closed to ease the filling of the hydraulic circuit corresponding to the device heater pump and the connection pipes This filling process could be done as follows use the submersible water pump to introduce water into the system by connecting the pump to the specific connection in the equipment number 1 5 in Fig 2 2 3 4 4 Connect to
4. energy consumption has to be noted as well Then take the pipes apart let the water out of the equipment and close the keys of the BHE Roll up the power cable and clean it if t is necessary Pick up the equipment and the tent clean them and store them in the GeoLab Once the test has been executed collect the data from the multt CELL SD card and the 176T4 and store them on your own PC or laptop for further processing It is recommended to gather them all in the same excel file in order to analyse the TRT 3 7 Interpretation of data For the interpretation of the TRT data the Infinite Line Source ILS approach is the most widely used method due to its simplicity The basic assumptions of the Infinite Line Source approach are Signorelli et al 2007 Infinite constant strength line source Homogeneous isotropic and infinite medium Negligible vertical heat flow along the BHE Constant lateral heat flow Temperature field around the BHE is dependent on time t and radial distance r From the consideration of a line source of heat in an infinite homogeneous medium with constant thermal properties and an initial ground temperature the temperature variation around the line source in space and time can be described as Banks 2008 1 Plet T dr D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 22 GEQENERGY Closed loop boreholes knowledge tools and best practice
5. kan jordens varmeledningsevne beregnes Figur 2 1 viser princippet 1 opstilling og m ling Vejledningen er del 2 af EUDP projektets Deliverable 8 Guidelines for equipment methods and calibration Medens introduktionen til rapporten her er skrevet p dansk er sproget 1 de folgende kapitler engelsk da vejledningen anvendes b de af VIA s danske og internationale studerende Rapporten er derfor samtidig en del af projektets Deliverable 18 Udstyr til thermal respons test er bygget op fra grunden i VIA s v rksted i l bet af 2011 og 2012 Det best r af en rekke komponenter der er nermere gennemg et 1 rapportens kap 2 P figur 1 1 ses det sammenbyggede udstyr Udover det hjemmebyggede udstyr rader VIA nu ogs over et kommercielt tilgengeligt udstyr produceret af UBeG Wetzlar Tyskland Dette udstyr har veeret brugt til ca 400 tests 1 Tyskland u i Fig 1 1 Thermal Response Test udstyr bygget pa VIA University College D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEQENERGY Closed loop boreholes knowledge tools and best practice 2 DESCRIPTION OF THE EQUIPMENT This is a user manual for the Thermal Response Test equipment assembled at VIA University College s GeoLab It is not therefore a report describing the theoretical background of the analysis methodologies for the interpretation of the data obtained from the TRT The main components in the system are the fo
6. Where To indicates the initial undisturbed ground temperature and r the borehole radius It is assumed that the grouting material around the borehole pipes 1s infinitely conductive For a time range of several hours a simplification of the previous equation 1 can be done This time period is called minimum time criteria tp This time criteria sets the length of the initial period of data that must be discarded it involves the short time data affected by the borehole heat exchanger I e the time criteria allows the study of the optimum data where steady state situation can be assumed Gehlin 2002 2 or Sec lt t Applying the time criteria the formulation for a line source of length z can be simplified Therefore the average BHE temperature 7 in a borehole with a radius of r provoked by a specific radial heat flow rate g and considering the effect of the borehole thermal resistance R between the circulating fluid and the BHE wall is Gehlin 2002 3 To Er m r TH Ta Where 7 corresponds to the average of inlet and outlet temperatures of the carrier fluid 4 _ Tig t Tout p From equation 3 it can be deduced that 5 Te k mnit m Being k the slope of the function along the horizontal axis as logarithm of time Hence the soil thermal conductivity can be derived from the slope k of the linear relation 6 q lnt Ine _ A 7 Ta oT Once the thermal c
7. GEQOENERGI Lukkede jordvarmeboringer viden v rkt jer og best practice Energianlaeg baseret pa jordvarmeboringer udvikling af markedsfremmende vaerktojer og best practice Energiteknologisk Udviklings og Demonstrations Program EUDP Omrade Energieffektivisering Program EUDP 10 Il J nr 64011 0003 D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEGENERGY Closed loop boreh knowledge fonte eae best practice GeoEnergy Tools for ground source heating and cooling based on closed loop boreholes Energiteknologisk Udviklings og Demonstrations Program EUDP Theme Energieffektivisering Programme EUDP 10 Il J nr 64011 0003 Project start 2011 03 01 Duration 3 years D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test Revision 1 Lead partner for this deliverable VIA UC u er nenes aad A e VWiA gt i ene ankak GEUS D riiai a iia aie Pa ee Harta 2 IVT GenBrilling uR GEQENERGY Closed loop boreholes knowledge tools and best practice Deliverable D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test Work package WP2 Equipment and Measurements Lead partner VIA UC 10 09 2014 Name organisation 7 gt OOOO Maria Alberdi Pagola VIA UC maap via dk Henrik Bjorn VIA UC HBJ via dk GEGENERGY Closed loop boreh knowledge fools eae best practice TABLE OF CONTENTS Cia
8. a loggers and the electric frame In the following figures from Fig 2 2 to 2 4 the specific parts of each section are named Hydraulic part of the equipment Fig 2 2 1 13 1 12 1 4 O ON 1 11 SEN ua 1 2 p E UI 00 N Fig 2 2 Hydraulic section of the TRT equipment 1 1 Heater connected to the controller TLZ 11 1 2 Circulation pump Grundfos MAGNA 25 100 1 3 Expansion vessel 1 4 Flow meter 8081 connected to multi CELL 8619 for monitoring the flow and collecting the data Both from Burkert 1 5 Connection for water pump to fill and pressurize the circuit 1 6 Valve to release air and water from the system 1 7 Valve to release air from the system 1 8 1 9 Connections to BHE red inlet to BHE blue outlet from BHE 1 10 1 12 Manometers D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEQENERGY Closed loop boreholes knowledge tools and best practice 1 11 Power cable 13 Metallic box for controllers and data loggers Controllers and data loggers Fig 2 3 Fig 2 3 Data Loggers and heater controllers of the TRT equipment 2 1 TLZ 11 heater controller 2 2 MultiCELL type 8619 flow meter data logger 2 3 TESTO 176T4 temperature logger D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEC Closed loop boreholes knowledge tools and
9. best practice Electric frame of the TRT equipment Fig 2 4 31 3 4 3 3 y Fig 2 4 TRT Electric Frame 3 1 Automatic fuses 3 2 3 Power outlets 240 Vac 13 Amp 3 3 2 Power outlets 3 x 400 Vac 16 Amp On the opposite side of the equipment a primary meter to measure the total power consumption has been placed 3 4 A secondary portable energy meter in one of the outlets to measure the power consumption of the electronics D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 10 GEQENERGY Closed loop boreholes knowledge tools and best practice 3 PROCEDURE TO EXECUTE A TRT A common TRT follows the subsequent process proposed for the boreholes in VIA Energy Park 1 Measurement of the undisturbed ground temperature before the TRT 11 Cleaning the borehole heat exchanger before starting the TRT 24 hours before 111 TRT Injection of a constant heat power during the test at least 48 hours iv Optional Observation of the recovery of the ground allowing the water circulation without heating during 48 hours more v Optional Logging of temperature profiles after the execution of the TRT without executing step iv For the determination of the soil thermal properties just the data logged n phases 1 and 111 can be taken into consideration The recovery test can be analysed n the same way as the heating process is evaluated From now on
10. ement SIGNORELLI S BASSETTI S PAHUD D amp KOHL T 2007 Numerical evaluation of thermal response tests Geothermics 36 141 166 D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 27
11. emperature which can be changed by pressing the arrows up increase or down decrease When no button it is touched for a period of 15 to 20 seconds the display will return to the initial display showing the temperature DO NOT UNDER ANY CIRCUMSTANCES HOLD THE BUTTON IT WILL CHANGE THE FUNDAMENTAL CONFIGURATION OF THE CONTROLLER The manual of the controller is placed in the GeoLab The TRT has already started The test procedure is automatic and works by itself once it starts D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 21 GEQENERGY Closed loop boreholes knowledge tools and best practice 3 5 During the TRT Whereas the test is being performed along the 48 50 hours the following data will be logged Circulating water flow Temperature of the input flow Temperature of the output flow Temperature of the heater Ambient temperature It s recommended a periodic visit to the site while taking measurements in order to be sure that the flow meter is measuring all the data is being recorded and there has not been any pressure drop working pressure 2 bars 3 6 Once the TRT is finished When the TRT has been running for the required period of time turn off first the multiCELL datalogger second the heater and finally the pump The temperature data loggers are turned off when the data is downloaded into the computer Besides as it has already been stated the final
12. evel never goes completely down For that try to have a hose close to the working place so that the continuous filling of the bucket is possible The whole process must be repeated until the water going out of the BHE is totally clean 15 20 min approx D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 16 GEQENERGY Closed loop boreholes knowledge tools and best practice 3 3 Preparing parameters for the TRT Before going on site and run the TRT some initial decisions and assumptions need to be done Besides information about the BHE length pipe diameter to be tested is required Power supply It has been considered taking onto account previous tests that the heater at 30 C is able to produce heat injection rates around 25 W m for 100 m depth BHE In some situations the 25 W m has turned to be too little The up to 50 80 W m mentioned n 1 is therefore advised Flow The flow has to be turbulent for the execution of a TRT Hence the Reynolds number Re had to be higher than 4000 in order to ensure the turbulence inside the pipes ame Hz Eb Where pis the density of the carrier fluid kg m v is the speed of the carrier fluid inside the pipes m s is the inner diameter of the pipe m and is the dynamic viscosity of the carrier fluid Pa s for the temperature we are going to deal with around 20 C For the calculations could be considered a 1000 kg m w
13. holes knowledge tools and best practice 3 2 Cleaning the BHE before the TRT After the Undisturbed Ground Temperature measurement a cleaning of the BHE must be carried out in order to extract all the possible dirtiness For this the following equipment is proposed which is available in the GeoLab Fig 3 4 A submersible pressure pump to make the water circulate through the borehole A bucket for water to put the pump inside A hose to link one of the pipes of the borehole to the pump Fig 3 4 a Submersible pressure pump b Water buckets c Hose with stortz connections After filling one of the buckets with water the pump must be placed inside Then one of the pipes of the BHE must be linked to the water pump with the hose Fig 3 5 After the water pump must be connected to the electric grid Fig 3 5 Connection of the pump to the BHE Before the pump runs the keys of the BHE must be opened Fig 3 6 a In order to make the pump work the floating switch has to be elevated This way the pump takes the water from the bucket and circulates it through the BHE going out from the opposite free end Fig 3 6 b D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 15 GEQENERGY Closed loop boreholes knowledge tools and best practice Fig 3 6 a Closed connection keys to a Single U BHE b Water flowing out of the BHE in order to clean it Make sure that the water l
14. iCELL has a SD card to store the data The card is inserted at the back of the unit The slot is just above the orange terminal bar at the left hand side The data is stored in a csv file which can be transferred to an excel worksheet To transfer the data remove the SD remember to stop data storing before removing the card and insert it into the PC in a compatible card reader Before starting the test the SD card must be empty Be aware to set the data logging interval the same in both for example 10 seconds By default the Burkert 8619 it is configured that way Later the data can be processed n order to reduce the data quantity making mean values for each 10 minutes D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEQENERGY Closed loop boreholes knowledge tools and best practice 3 4 Setting up and starting the TRT The following steps must be followed in order to execute a correct TRT with the VIA UC equipment 3 4 1 Check list Before we go to the site we should remember to take all the required tools and make the necessary checks Tools for connections keys screwdrivers bridles Water Buckets Hoses connections for the hoses Power cable extension SD card for flow meter Testo temperature data logger cable Thermocouple cables well placed Laptop Notebook pencil Parameters prepared temperature for heating flow in litres min
15. ity from 2 16 literature MJ m K Average Water Volumetric Flow m h 1 554 TRT Duration h 49 83 Average Heat Input Rate W m 57 19 Table 1 TRT main parameters The following figure 1 shows the measured inlet outlet and average temperatures over the TRT 28 26 24 IN NO NO Temperature C oo 0 0 20 30 Time h D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 24 GEQENERGY Closed loop boreholes knowledge tools and best practice Figure 1 Measured input and output temperatures over the TRT For the time criteria calculation an approximation for the thermal conductivity and the volumetric heat capacity of the soil has to be done from the literature In this case the data before 9 hours has to be discarded Steps 3 and 4 are shown in Figure 2 25 5 T 25 ani ne eee ee A SEES SEE SES SE SE SEES SS NO Eh y 2 12In x 16 62 Temperature C N oo 21 E E E gt 10 10 Time s 5 10 Figure 2 Least square trend line calculation for the TRT data Applying the provided equations A 57 19 W m 4 1 2 12 K 2 14 W m K R 0 114 Km W Finally figure 3 shows the fit between the calculated and the measured values This way comparing the values along the time the deviations can be calculated and subsequently the error estimated D8 Guidelines for equipment methods and calibration Part 2 Thermal Re
16. llowing and they are shown in the scheme in Fig 2 1 Temperature sensors Flow meter Heater Circulation pump Expansion vessel Air vent valves Data loggers Connection hoses The software required for the data loggers are described later DATA LOGGING TRT EQUIPMENT FLOW METER Lee YY CIRCULATION PUMP EXPANSION VESSEL Y HEATER INLET FLOW TEMPERATURE SENSOR OUTLET FLOW TEMPERATURE SENSOR CONNECTION ELECTRIC POWER V AIR VENT W HOSE CONNECTION CONNECTIONS BOREHOLE HEAT EXCHANGER Fig 2 1 Scheme of the main components of the TRT equipment D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEC HENERGY Closed loop boreholes knowledge tools and best practice The two temperature sensors that measure the fluid temperature in the inlet and outlet pipes are thermocouple sensors connected to a data logger The ultrasonic flow meter has a 0 001 m h accuracy and there is a consumption meter as well in the electric frame The data 1s recorded each 10 s The heater has a nominal power of 3kW and generates a supply of constant warm water The amount of energy injected to the ground is a function of the measured flow the temperature difference and the heat capacity of the liquid The equipment can be divided in 3 sections the hydraulic section the controllers and dat
17. m length c Cable extension The temperature logging of the borehole is recorded each meter along the pipe through all the BHE depth using a temperature sensor linked on a graduated cable and taking an average of all the executed measurements This way the readings are used to calculate the arithmetic mean of the undisturbed borehole temperature In Fig 3 2 the measurement process is shown D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 12 GEQENERGY Closed loop boreholes knowledge tools and best practice x Pif N en O Fig 3 2 a Connection of all the devices and probe insertion into the BHE b Undisturbed temperature measurement in progress The first step 1s to prepare a sheet of paper to note the starting date and time the initial ambient temperature the depth of the BHE and the temperature measurement each meter or what it is considered In order to take an accurate measurement a 4 minute period has to be waited per each meter so as to leave the thermometer stabilize Note that there will be no problem in the first few meters but as more meters are measured the cable will be heavier so the cable must be held Notice that if the BHE is 100 m depth 100 m multiplied by 4 min per measurement makes 400 minutes which means more than 6 hours of test This requires a good planning of the works Besides consider that 1 day before the measurement the BHE should be filled wi
18. mary meter After the test is done the final consumption data has to be noted as well The logging of the flow and the temperature is done by two different devices The clocks in the devices have to be synchronized Start 176T4 temperature logger as t has been configured To start the multiCELL you need to access the Parameters menu and choose Datalogger Now there are 5 choices Status and Period are the only ones that have to be modified Status provides the choice between turning the data logger ON and OFF Period provides the opportunity to decide how often the data should be stored It is possible to change the period when the data logging is on it just creates a new file while storing the first The multiCELL remembers how many files has created and it numbers them continuously The maximum logging capacity is 15 000 rows Notice that the multiCELL gathers data just if the flow meter is measuring Before the heater is turned on the water should be circulating at least during 30 minutes with the data loggers on and the flow meter measuring 3 4 6 Set the heater temperature and start the TRT Adjust the temperature of the heater on the TLZ 11 controller The display normally shows the current temperature in the heater Once it is modified the heater starts working A short push lt 1 sec to the button marked P will make SP flash in the display alternating with a value The value is the Set Point t
19. onductivity has been estimated the thermal borehole resistance R can be calculated using the next equation 7 OR L fy BE sem mE Sve The undisturbed soil temperature To has been measured previously and for the calculation of the trend line the least squares method 1s followed D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 23 GEQENERGY Closed loop boreholes knowledge tools and best practice The following algorithm steps should be followed in order to obtain the thermal conductivity and the borehole resistance Monz 2011 Calculate the average fluid temperature 7 Equation 4 Calculate the minimum time criteria t Equation 2 Discard the initial data and plot Trin a log scale of time Use least square method to calculate the trend line Equation 5 Calculate A Equation 6 Calculate R over time Equation 7 Determine the average value of Rp Plot the calculated mean temperature Equation 3 together with the measured one and determine the error Yt Do OF a a fe In the following an example corresponding to a TRT in a 100 m depth BHE is given The measured temperatures are provided in Figure 1 and parameters about the test are available in table 1 Heat Exchanger Type Single U Borehole Diameter mm 160 Active Length m 100 External Pipe Material Polyethylene Average Undisturbed Soil Temperature 2C 9 63 Expected Soil Volumetric Heat Capac
20. rmal conductivity in soil samples in the laboratory with the Thermal Needle Probe Method D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEQENERGY Closed loop boreholes knowledge tools and best practice ACKNOWLEDGEMENTS The author wants to do a special mention to Adrian Holgado Gomez Claudia Gomez Garcia and Alejandro Rodriguez Pozo They have been working with the equipment and improving the manual during their Bachelor Final Project Besides acknowledgement goes to Hans Erik Hansen and Carl Johan Runge Andersen who are the ones that have continuously developed and improved the equipment D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEQENERGY Closed loop boreholes knowledge tools and best practice ACRONYMS BHE Borehole Heat Exchanger TRT Thermal Response Test D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEC HENERGY Closed loop boreholes knowledge tools and best practice 1 INTRODUKTION N rv rende rapport er en vejledning til den m leprocedure der er udviklet p VIA UC ved udf relse af en termisk respons test Princippet 1 en termisk responstest er at en v ske der cirkulerer 1 en jordvarmeborings lukkede r rsystem p f res en kendt energim ngde 1 form af varme 1 et givet tidsrum Ved at m le responsen fas et udtryk for afs tningen af varme 1 jorden Gennem analyse af data
21. sponse Test 25 GEQENERGY Closed loop boreholes knowledge tools and best practice o T measured M T calculated E SE E KE RE SS Temperature C 21 Figure 3 A MI E y u rra XQ as OE Es Es sqi 2 E Km AN ar EE EEEE E EEEE E E D E EAE EE ENE Hr rr Er PPE EE E DEDE DELETE TELE eee eee EB eee eee eee eee eee eee eee DE GEDE LE TELE TELE eee eee eee eee eee eee DELE LEE DEDE LOE EET TE eee 10 15 20 25 30 35 40 45 50 Time h Measured average temperatures VS calculated average temperatures D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 26 GEQENERGY Closed loop boreholes knowledge tools and best practice REFERENCES Geotrainet Geotrainet Training Manual for Design of Shallow Geothermal Systems S b l E Europe Editor 2011 Geotrainet Geo Education for sustainable geothermal heating and cooling market BANKS D 2008 An Introduction to Thermogeololy Ground Source Heating and Cooling Oxford Blackwell Publishing GEHLIN S 2002 Thermal Response Test Method Development and Evaluation Doctor of Philosophy Lulea University of Technology MONZO P M 2011 Comparison of different Line Source Model approaches for analysis of Thermal Response Test in a U pipe Borehole Heat Exchanger Master of Science Thesis Energy Technology 2011 Master of Science Thesis KTH School of Industrial Engineering and Manag
22. th water In addition take care of dirt and be careful that no soil or any kind of particles are inserted into the BHE This could lead into the breaking of the circulation pump n the TRT equipment Moreover while enrolling the cable again try to clean n the process D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 13 GEQENERGY Closed loop boreholes knowledge tools and best practice 3 1 2 Equipment 2 Hydrotechnik Water Meter A new equipment has just been received at VIA University College but just one BHE has been measured with t As Equipment 1 has been used during all the GeoEnergy project t has also been described n th s report The new device is a Hydrotechnik GmbH Water Meter Type 110 Fig 3 3 for level and temperature measurements 150 meter depth and with a bottom sensor Fig 3 3 Well Temperature logger This equipment allows a lower measurement period so time is saved The measurement process is the same as for Equipment 1 However it does not require any connection to the grid and the temperatures are displayed in the small screen placed on the frame Another way to calculate directly the average undisturbed temperature is making circulate the carrier fluid through the borehole for about 30 minutes before starting the heating for the TRT D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEQ ENERGY Closed loop bore
23. the power and start the pump Unroll the cable gathered in the side of the equipment find a power outlet 3 x 400 N earth 16 A and plug it in In VIA Energy Park the connection to the grid must be taken from the EcoLab It has to be ensured that no air is trapped in the system So the BHE is opened and once the circuit is filled and closed the same connection could be used to release air together with the valves placed for this aim The circulation pump can start running and it will help in the process of getting rid of the air Once all the trapped air has been released the circuit has to be pressurized up to 2 bars by means of the submersible water pump same procedure as for filling the circuit The manometers will ensure the control of this parameter and it can be checked that the pressure is the same in the input and output sides D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test 20 GEQENERGY Closed loop boreholes knowledge tools and best practice The starting of the pump is simple since once the system is connected to the grid it is about pressing the arrows and choosing the required position flow Notice that if an exact flow which cannot be achieved by the pump adjustment is desired it is possible to insert a valve into the circuit to adjust the flow 3 4 5 Start recording data The first value to note is the initial total energy consumption kWh readable from the pri
24. the process will be described step by step D8 Guidelines for equipment methods and calibration Part 2 Thermal Response Test GEQENERGY Closed loop boreholes knowledge tools and best practice 3 1 Measurement of Undisturbed Ground Temperature It is important to consider that before taking the undisturbed ground temperature measurements the borehole must be filled with water or brine at least one day before the measurements are taken so that the liquid takes the temperature of the ground Note that the drilling process will change the temperature in and around the borehole It is recommended 1 to wait at least 5 days between installing the BHE and the measurement The devices used for this type of measurements could be different but they are produced to do measurements in liquids VIA University College owns two equipments in its Energy Lab 3 1 1 Equipment 1 thermometer with taped cable The equipment is shown n Fig 3 1 and consists of Thermal sensor or thermometer connected in the free end of the graduated cable Data logger ALMENO 2590 2 3S 4S by AHLBORN which requires electric connection to the grid and it is connected to the thermometer Graduated cable with marks each meter and which is connected to the data logger Cable extension to connect the data logger to the electric grid Fig 3 1 a Data Logger for the thermal probe placed in the free end of the taped cable b Rolled taped cable 125
25. tive of the project GeoEnergy Tools for ground source heating and cooling based on closed loop boreholes is to pave the way for a wider use of the technology by acquiring know how and developing tools and best practice for the design and installation of plants as well as providing training and dissemination The project is co financed by the partners and the EUDP programme of the Danish Energy Agency Energistyrelsen and the duration is 3 years starting from 2011 03 11 The partners are De Nationale Geologiske Unders gelser for Danmark og Gr nland GEUS VIA University College Horsens VIA UC Geologisk Institut Aarhus Universitet GIAU Den Jydske Handveerkerskole DJH Dansk Miljo amp Energistyring A S DME GeoDrilling A S GeoD Br dstrup Fjernvarme AMBA BrFj DONG Energy Power A S DONG Robert Bosch A S IVT Naturvarme BOSCH The work in GeoEnergy is structured in 8 work packages WPI Database and dissemination WP2 Equipment and measurements WP3 Temperature gradients and surface temperatures WP4 Drilling methods and grout techniques WP5 System design and energy balance WP6 Training and education WP7 Interaction w th ambient groundwater system WP8 Guidelines and final dissemination This document is Part 2 of deliverable D8 Guidelines for equipment methods and calibration dealing with guidelines for use of equipment for thermal response test of boreholes Part 1 contains guidelines for measurement of the
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