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GB/T 14813-2008: Life testing method for heat pipes
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 14813-2008	English	279	Add to Cart	3 days [Need to translate]	Life testing method for heat pipes
GB/T 14813-1993	English	239	Add to Cart	2 days [Need to translate]	Life testing method for heat pipe

GB/T 14813-2008: Life testing method for heat pipes

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Life testing method for heat pipes ICS 27.060.30 J75 National Standards of People's Republic of China Replacing GB/T 14813-1993 Heat pipe life test method Posted 2008-06-26 2009-01-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard replaces GB/T 14813-1993 "Standard Test Method for heat pipe life." This standard and GB/T 14813-1993 compared to the main changes as follows. --- Original standard "heat pipe" to "gravity heat pipe and tubular heat pipe has a die"; --- Gravity heat pipes and tubular specimens have die heat pipe heat pipe straight clear; --- Original standard "heat treatment" to "insulated"; --- Identified two different test heating power control mode; --- Have increased tubular die and gravity heat pipe heat pipe different test status can be employed; --- Clear method to determine the gravity heat pipe and tubular die there are non-condensable heat pipe gas quantity; --- Clear position of the evaporating section gravity heat pipes and tube heat pipe die in a vertical state test; --- Increased life test method loop heat pipe content. This standard Annex A, Annex B and Annex C is informative appendix. The standard proposed by China Aerospace Science and Technology Corporation. The standard by the China Aerospace Science and Technology Corporation. This standard drafting unit. China Academy of Space Technology in general, Chinese Academy of Sciences Institute of Engineering Thermophysics, China Shipbuilding Industry Corporation Companies seventh eleven Institute. The main drafters of this standard. Shaoxing Guo Lu Wei, Miaojian India, Sun Quanping, Houzeng Qi, Qu Wei. This standard replaces the standards previously issued as follows. --- GB/T 14813-1993. Heat pipe life test method

1 Scope

This standard specifies the principles of heat pipe life test, specimen preparation, test equipment, test environment, test results processing, gravity heat pipe and tubular There are non-condensable die of heat pipe to determine the amount of gas, the loop heat pipe life assessment. This standard applies to gravity heat pipe, tubular die has heat pipes, loop heat pipes and other non-condensable gases and produce life test compatibility related Other types of heat pipe life test compatibility can refer to these standards.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 14811 term heat pipe

3 Terms and Definitions

Terms and definitions GB/T 14811 apply to this standard established.

4 Test principle

4.1 the working fluid and the shell, die materials and welding materials produced according to the degree of non-condensable gases to determine the life of the heat pipe. 4.2 For the gravity heat pipe and tubular heat pipe has a die, non-condensable gas accumulated in the heat pipe condenser section, and with the increase of working hours, non-condensable gas Accumulation of body area gradually expanded, reducing the area of \u200b\u200bthe condensing heat exchanger, heat transfer capacity of the heat pipe gradually decline, eventually leading to failure of the heat pipe. 4.3 For the loop heat pipe, non-condensable gas accumulates in the normal flow of fluid channels and compensation, increased with the number of non-condensable gases, heat pipe Heat transfer performance gradually decline, resulting in heat pipe failure. Specimen Preparation 5 5.1 specimen materials and technology Life test specimens must meet the technical requirements of the product, with its shell, and die varieties and grades of welding materials, refrigerants Composition and purity, and related heat pipe manufacturing process must be consistent with the product. 5.2 specimen structure 5.2.1 gravity heat pipe and tubular heat pipe has a die Specimen generally 1000mm length of straight pipe heat for different lengths of the specimens, except as otherwise provided, an aspect ratio of 30 to 100. Full length into the evaporator section A, section B and the adiabatic condensation section C of three parts, see Figure 1. External specimens usually light tube, but may be needed in the trial Member mounted fins. Adiabatic section B length 200mm, according to the heating and cooling needs, under the same conditions the total length of the selected segment A and evaporation C is the length of condensation section. 5.2.2 loop heat pipe Loop heat pipe evaporator, a condenser, the same compensation from the actual product. Catheters and length of pipe loop heat pipe should be at least as practical 1/3 ~ 1/2-length applications, the condenser loop heat pipe specimens shall ensure reflux loop heat pipe heat transfer Maximum specimen in the specimen Under power supercooling degree, the cooling capacity of 3 ℃ ~ 5 ℃ still guarantee the normal work of the specimen evaporator temperature is maintained within the design values, the loop heat Compensator containment tube specimens should ensure that the vapor in the condenser to occupy at maximum heat transfer power of the test piece does not exceed the total area of \u200b\u200bthe condensing area 3/4 loop heat pipe specimens compensation should be positioned with the requirements of practical use of the same position. Specimen pattern is shown in Figure 2. ...