Abstract
The paper presents the results of experimental studies of heat pipes and their thermo-technical characteristics (heat power, conductivity, heat transfer resistance, heat-transfer coefficient, temperature level and differential, etc.). The theoretical foundations and the experimental methods of the research of ammonia heat pipes made of aluminum section АS – КRА 7.5 – R1 (made of the alloy AD - 31) are explained. The paper includes the analysis of the thermo-technical characteristics of heat pipes as promising highly efficient heat transfer devices, which may be used as the basic elements of heat exchangers - heat recuperators for exhaust ventilation air, capable of providing energy-saving technologies in ventilation systems for housing and public utilities and for various branches of industry. The thermo-technical characteristics of heat pipes (HP) as the basic elements of a decentralized supply-extract ventilation system (DSEVS) and energy-saving technologies are analyzed. As shown in the test report of the ammonia horizontal HP made of the section АS-КRА 7,5-R1-120, this pipe ensures safe operation under various loads.
Highlights
IntroductionThe purpose of this research is to create the scientific and technical basis for the design, manufacturing technology and tests of energy-saving decentralized supply-extract ventilation systems (DSEVS) based on new generation HP with tear-drop structure of the core and optimal constructive-processing and performance characteristics [1].The objective of this research is to select optimal constructive-processing characteristics [2] for creating DSEVS based on high conductivity ammonia heat pipes (HP).Special attention is paid to the rational and complex use of a flat HP with biphase heat-transfer fluid as a partition, and the organization of heat input in the case of flow-over of warm, exhausted air (the evaporation zone below) and heat removal (the condensation zone above), using fin fan computer heat exchangers (aluminum, aluminumcopper radiators ) [3, 4]
The purpose of this research is to create the scientific and technical basis for the design, manufacturing technology and tests of energy-saving decentralized supply-extract ventilation systems (DSEVS) based on new generation HP with tear-drop structure of the core and optimal constructive-processing and performance characteristics [1].The objective of this research is to select optimal constructive-processing characteristics [2] for creating DSEVS based on high conductivity ammonia heat pipes (HP).Special attention is paid to the rational and complex use of a flat HP with biphase heat-transfer fluid as a partition, and the organization of heat input in the case of flow-over of warm, exhausted air and heat removal, using fin fan computer heat exchangers [3, 4]
As the results of testing the HP made of the section AS-KRA7.5-R1-120 or R2 show, the symmetrical distribution of thermal power between two simulators of heat-emitting equipment lengthwise in horizontal position and heightwise in vertical position, when Q1=Q2=5; 10; 15; 20 W contributes to the increase in the degree of isothermality of the honeycomb panel’s temperature pattern
Summary
The purpose of this research is to create the scientific and technical basis for the design, manufacturing technology and tests of energy-saving decentralized supply-extract ventilation systems (DSEVS) based on new generation HP with tear-drop structure of the core and optimal constructive-processing and performance characteristics [1].The objective of this research is to select optimal constructive-processing characteristics [2] for creating DSEVS based on high conductivity ammonia heat pipes (HP).Special attention is paid to the rational and complex use of a flat HP with biphase heat-transfer fluid as a partition, and the organization of heat input in the case of flow-over of warm, exhausted air (the evaporation zone below) and heat removal (the condensation zone above), using fin fan computer heat exchangers (aluminum, aluminumcopper radiators ) [3, 4]. The purpose of this research is to create the scientific and technical basis for the design, manufacturing technology and tests of energy-saving decentralized supply-extract ventilation systems (DSEVS) based on new generation HP with tear-drop structure of the core and optimal constructive-processing and performance characteristics [1]. The objective of this research is to select optimal constructive-processing characteristics [2] for creating DSEVS based on high conductivity ammonia heat pipes (HP). The objects of the research are HP and fans-heat recupretors based on high-conductivity heat pipes [5]. Notation system σ coefficient of surface tension ρl liquid density ρv steam density μl liquid dynamic viscosity μv steam dynamic viscosity dhp outside diameter of the pipe din inside diameter of the pipe le length of evaporation zone lc length of condensation zone lhp geometrical length (height) of the heat pipe ladd, e length of evaporation zone under additional or bottom heater ladd, c length of condensation zone under additional heater Т1 temperature of evaporator shell (Т1=Ти) Т2 temperature of condenser shell (Т2=Тк) λl heat conductivity of ammonia L evaporation heat g intensity of gravity Q heat transfer ability of the thermal syphon or heat pipe ΔPs capillary pressure of liquid ΔPf capillary pressure of film Dv diameter of steam passage channel G amount of heat-transfer fluid put in the interior of the heat pipe
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