czas-i-pomiary: Heat pipe

Evidence: 91 • authority: 72

A heat pipe is a heat-transfer device that employs phase transition to transfer heat between two solid interfaces. At the hot interface of a heat pipe, a volatile liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface. The vapor then travels along the heat pipe to the cold interface and condenses back into a liquid, releasing the latent heat. The liquid then returns to the hot interface through capillary action, centrifugal force, or gravity, and the cycle repeats. Due to the very high heat-transfer coefficients for boiling and condensation, heat pipes are highly effective thermal conductors. The effective thermal conductivity vari…

Evidence: 38 • authority: 92

Performance and cost-benefit analysis of an integrated earth-air heat exchanger and air handling unit system.. Earth-Air Heat Exchanger (EAHE) systems present a sustainable solution to reduce the energy consumption of HVAC systems by utilizing stable subsurface temperatures for passive air conditioning. This study investigates the performance of an EAHE integrated with a central air conditioning system, focusing on the effects of pipe geometry, burial depth, cross section of pipe and thickness on thermal efficiency and economic viability. Despite extensive studies on EAHE systems, gaps remain in understanding the combined impact of pipe cross-section, thickness, and burial depth on system p…

Evidence: 38 • authority: 90

Hybrid Heat Pipe-PCM-Assisted Thermal Management for Lithium-Ion Batteries. A hybrid cooling method for 18650 lithium-ion batteries has been investigated using both experimental and numerical approaches for electric vehicle applications. The experimental setup includes a heater section, a phase change material (PCM) reservoir, and a cooling section. The heater section simulates battery heat generation with two cylindrical aluminum housings, each sized to match an 18650 battery, two cartridge heaters, and an aluminum heat sink. An airflow channel is incorporated into the cooling section. Heat transfers sequentially from the heaters to aluminum housings, the heat sink, through three copper-wa…

Evidence: 38 • authority: 90

Design and test of a heat pipe for geothermal applications. Heat pipes are typically used in the semiconductor industry. This means that the scale of these heat pipes is typically in the order of centimeters. Zijm suggests that heat pipes could be used for geothermal applications, but literature is lacking. To further investigate the geothermal application of heat pipes, a large scale heat pipe is built. This thesis gives an insight in the typical design challenges that one faces when constructing a heat pipe of this scale. The heat pipe that is constructed can support a heat flow of 10 kW. The heat pipe is constructed from mainly 54 millimeter copper and glass pipes. The evaporator section…

Evidence: 38 • authority: 90

A Review of Working Fluids and Flow State Effects on Thermal Performance of Micro-Channel Oscillating Heat Pipe for Aerospace Heat Dissipation. A MCOHP (micro-channel oscillating heat pipe) can provide lightweight and efficient temperature control capabilities for aerospace spacecraft with a high power and small size. The research about the heat flow effects on the thermal performance of MCOHPs is both necessary and essential for aerospace heat dissipation. In this paper, the heat flow effects on the thermal performance of MCOHPs are summarized and studied. The flow thermal performance enhancement changes of MCOHPs are given, which are caused by the heat flow work fluids of nano-fluids, gas…

Evidence: 22 • authority: 80

Thermal Conductivity of Heat Pipe Container and Wick Materials

Evidence: 22 • authority: 80

Thermal conductivity of heat pipe container and wick materials

Evidence: 22 • authority: 80

Thermal Conductivity of Heat Pipe Container and Wick Materials

Evidence: 22 • authority: 80

Thermal Conductivity of Heat Pipe Container and Wick Materials

Evidence: 22 • authority: 80

Thermal conductivity of heat pipe container and wick materials

Evidence: 22 • authority: 92

Mixed and forced convection heat transfer and pressure drop in inclined tube with twisted tape in transition flow.. Understanding the influence of angular orientation on mixed convection heat transfer and pressure drop in circular tubes with swirl generators is crucial for optimizing thermal performance in various engineering applications, including heat exchangers and energy systems. This study aims to investigate the impact of angular orientation on heat transfer enhancement and pressure drop characteristics in a uniformly heated circular tube equipped with a twisted-tape longitudinal swirl generator. An experimental approach was employed, varying key parameters such as Reynolds number (4…