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S8 Engenharia Aeroespacial |
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Title:
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EXPERIMENTAL SETUP TESTS FOR A MULTISTAGE PASSIVE CRYOGENIC RADIATOR FOR SPACE APPLICATIONS
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Summary :
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ABSTRACT. THE DEVELOPMENT OF PASSIVE CRYOGENIC RADIATORS (PCR) FOR SPACECRAFT APPLICATIONS IS ONE OF THE PROJECTS OF SUBSYSTEMS FOR SATELLITE THERMAL CONTROL UNDER THE FRAME OF A CONTRACT BETWEEN THE SATELLITE THERMAL CONTROL LABORATORY (NCTS) AND THE BRAZILIAN SPACE AGENCY (AEB). THIS DEVICE IS DESIGNED TO MEET THE REQUIREMENTS OF COOLING CAPACITY FOR INFRARED RADIATION SENSORS AND CHARGED COUPLED DEVICES (CCD CAMERAS) AT CRYOGENIC TEMPERATURE LEVELS. THESE EQUIPMENT WILL BE THE PAY-LOAD OF THE SMALL-SIZED BRAZILIAN SATELLITES PROPOSED AT THE NATIONAL PROGRAM FOR SPACE ACTIVITIES (PNAE). THE MAIN OBJECTIVE OF THIS WORK IS TO PRESENT THE EXPERIMENTAL SETUP AND DATA OBTAINED FOR TWO PROTOTYPES OF A SMALL SCALE MULTISTAGE PCR. THE PROPOSED DEVICE IS ABLE TO MEET THE NEED OF COOLING CAPACITY OF 0.1 W @ 150 K AT THE 1ST STAGE. DOUBLE AND TRIPLE CONFIGURATIONS ARE TESTED. EXPERIMENTAL DATA ARE COMPARED WITH ANALYTICAL RESULTS AND THE EXPERIMENTAL UNCERTAINTIES ARE DISCUSSED. THE MATHEMATICAL MODEL DEVELOPED TO PREDICT THE TEMPERATURE DISTRIBUTION AND THE HEAT TRANSFER RATE IN THE PCR IS BRIEFLY DISCUSSED.
KEY-WORDS: SATELLITE THERMAL CONTROL, RADIATOR, CRYOGENIC.
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Author :
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Couto, Paulo
Lopes, André A.
Mantelli, Marcia B. H.
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Paper View :
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