Capabilities of a New Pressure Controller for Gas-Controlled Heat Pipes

Giunta, Salvatore; Merlone, A.; Marenco, S; Marcarino, P.; Tiziani, A.

doi:10.1007/s10765-008-0464-3

Cited by 11 publications

(12 citation statements)

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“…A new pressure control system has been designed and manufactured at INRiM [9]. It is based on the use of a standard platinum resistance thermometer (SPRT) to sense the temperature inside the heat pipe.…”

Section: Control Systemmentioning

confidence: 99%

A New Mercury Gas-Controlled Heat Pipe for Temperature Amplifier and as Calibration Facility

2008

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At the Italian National Research Institute of Metrology the activities and studies on the Gas Controlled Heat Pipes are constantly increasing in terms of involved personnel, instrumentations and devices available. In last two years, among the other activities, a totally new Gas-Controlled Heat Pipe operating with mercury as working fluid has been designed, manufactured and completely characterised. \ud \ud This Heat Pipe is made in stainless steel and provided with three thermometers wells. A dedicated furnace has been constructed too and specific software algorithms have been implemented for the temperature and pressure control. This device will be used as low temperature reference for the new “Temperature Amplifier” and, at the same time, as calibration facility for thermometers calibrations by comparison in the field between 220 °C and 450 °C. All details regarding this Heat Pipe, including assembly, filling and testing procedures, and the complete characterisation campaign are here summarised. \ud \ud Results in terms of temperature stability, uniformity, time response are reported, and demonstrate the capabilities of this Gas Controlled Heat Pipe to be a useful device for researches and applications in contact thermometry. \ud \ud A further Gas Controlled Heat Pipe operating with mercury has been manufactured, provided with six thermometer wells and will be characterised for the contact thermometry calibration laboratory on INRiM and for other calibration groups; this device is presented too

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Section: Control Systemmentioning

confidence: 99%

A New Mercury Gas-Controlled Heat Pipe for Temperature Amplifier and as Calibration Facility

2008

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“…During the experiment, first, it is necessary to find appropriate heating powers for the mercury heat pipe and sodium heat pipe in order to obtain good temperature uniformity along their thermometer wells. When the temperature uniformities along the thermometer wells in the sodium heat pipe and mercury heat pipe meet the experimental needs, the dedicated controlling systems are used to control the set-point value, using an SPRT as a pressure sensor in the mercury GCHP [2,3]. Temperature data (stability and uniformity) are then recorded for both low and high temperatures, using the same SPRT for the mercury, while an HTSPRT in the sodium GCHP records the higher temperatures.…”

Section: Starting Activitiesmentioning

confidence: 99%

INRIM and NIM Cooperation on the Temperature Amplifier

et al. 2008

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In August 2006, a scientific cooperation agreement between the Italian National Research Institute of Metrology (INRiM) and the National Chinese Institute of Metrology (NIM) was signed. The cooperation will last at least 3 years and has several goals in the field of contact thermometry. First of all, the Chinese Thermometry Division intends to have a temperature amplifier (TA) operative in its laboratories. The cooperation will begin with the manufacture of two new gas-controlled heat pipes by INRiM for NIM: one for lower temperatures and the other for higher temperatures, up to the silver fixed point. The know-how required for the use of those devices will be transferred from INRiM to NIM, since some young Chinese researchers will spend several months working in the Gas-Controlled Heat Pipes Laboratory of INRiM, learning all working principles of the TA and of the involved devices, such as the pressure controller, pressure lines, heater control, and cooling systems. Next, the heat pipes will be filled at INRiM with the working fluids (mercury and sodium) and sent to NIM. NIM will manufacture part of the required accessory devices, such as furnaces, pressure lines, and cooling systems, while a new pressure controller will be manufactured at INRiM for NIM. The acquired and assembled new devices will allow NIM to cooperate in several research activities related to contact thermometry, such as phase transition studies, new temperature standard proposals, and calibration capabilities evaluation. The paper reports all details of this cooperation, the first results achieved, and those expected.A. Merlone (B) · S. Giunta

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“…As a result, these heat pipes can be maintained isothermally. These heat pipes are also called variable conductance heat pipes (VCHPs) and are applied to precision spacecraft thermal control [2], electronics temperature control, and accurate temperature measurements [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…According to the working principle of GCHPs [3,22], liquid-vapor transition temperatures of pure substances, such as water, sodium, potassium, cesium, and mercury, can be determined by the corresponding vapor pressures. Moreover, the temperature stability of the GCHPs depends on controlling pressure stability.…”

Section: Introductionmentioning

confidence: 99%

NIM gas controlled sodium heat pipe

Yan¹,

Zhang²,

Merlone³

et al. 2013

AIP Conference Proceedings

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Gas controlled heat pipes (GCHPs) provide a uniform, stable and reproducible temperature zone to calibrate thermometers and thermocouples, and to realize defining fixed points using a calorimetric method. Therefore, to perform such investigations, a GCHP furnace using sodium as its working fluid was constructed at the National Institute of Metrology (NIM), China. Also, investigations into the thermal characteristics of the NIM gas controlled sodium heat pipe were carried out. The temperature stability over 5 hours was better than ±0.25 mK while controlling the pressure at 111250 Pa. The temperature uniformity within 14 cm from the bottom of the thermometer well was within 0.3 mK. While keeping the pressure stable at the same value, 17 temperature determinations were performed over 14 days, obtaining a temperature reproducibility of 1.27 mK. Additionally, the NIM gas controlled sodium heat pipe was compared with the sodium heat pipe produced by INRiM. The temperature in the INRiM sodium heat pipe operating at 111250 Pa was determined, obtaining a difference of 21 mK with respect to the NIM GCHP. This difference was attributed to sodium impurities, pressure controller capabilities and reproducibility, and instabilities of high temperature standard platinum resistance thermometers (HTSPRTs). Further investigations will be carried out on extending the pressure/temperature range and connecting both GCHPs to the same pressure line.

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Capabilities of a New Pressure Controller for Gas-Controlled Heat Pipes

Cited by 11 publications

References 1 publication

A New Mercury Gas-Controlled Heat Pipe for Temperature Amplifier and as Calibration Facility

A New Mercury Gas-Controlled Heat Pipe for Temperature Amplifier and as Calibration Facility

INRIM and NIM Cooperation on the Temperature Amplifier

NIM gas controlled sodium heat pipe

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