136 results about "Radiant heat transfer" patented technology

An apparatus is provided to remove heat from a heat-generating component of a computer, such as a processor. The apparatus comprises a first heat sink having a plurality of leader fins, wherein the first heat sink is thermo-conductively coupled to a heat-generating component that is coupled to a first portion of a chassis; and a second heat sink having a plurality of follower fins, wherein the second heat sink is thermo-conductively coupled to a second portion of the chassis, and wherein the plurality of follower fins are disposed in an interlaced configuration with the plurality of follower fins to promote radiative heat transfer from the leader fins to the follower fins. Optionally, one or more alignment structures may be used to facilitate the relative movement of the first and second chassis portions into an operative position in which the leader and follower fins are in the interlaced configuration. The apparatus may be used to remove heat from a heat-generating component in a closed system with little or no limited air flow.

The embodiment provided herein are directed to a pyroelectric (PE) energy converter which is capable of combining nanoscale thermal radiation and pyroelectric energy conversion for harvesting low grade waste heat. The converter advantageously makes use of the enhanced radiative heat transfer across a nanosize gap to achieve high operating frequencies or large temperature oscillations in a composite PE plate. The PE energy converter generally comprises a hot source, a cold source, and a PE plate, wherein the PE plate oscillates between the hot and cold source and the PE plate can be subjected to a power cycle in the displacement-electric field diagram. The hot and cold sources of the converter can be coated with SiO₂ absorbing layer to further enhance the radiative heat fluxes. The converter comprising a PE plate made of 60/40 P(VDF-TrFE) operated between 273 K and 388 K experiences a maximum efficiency of 0.2% and a power density of 0.84 mW/cm². The converter comprising a PE plate made of 0.9PMN-PT composite thin films achieve a higher efficiency and a larger power output namely 1.3% and 6.5 mW/cm², respectively, for a temperature oscillation amplitude of 10 K around 343 K at 5 Hz.

A cooking appliance for grilling food products has a griddle plate and a heating assembly that contains a non-contact infrared heating element to achieve uniform plate temperatures, fast initial warming times and fast recovery times. The heating element is situated in a cavity formed by thermal insulating material in the assembly. When the assembly is secured to the griddle plate, there is a space between the heater element and the griddle plate to allow infrared radiation heat transfer to heat the griddle plate. The insulating material has a relatively high insulating factor so as to minimize heat loss and reduce energy usage.

A step of preparing data of (1) material properties of a first part and so on and data of (2) an amount of solar radiation passing through the translucent member to reach a measuring device having a shape imitating a human body part, an amount of solar radiation to the structure, an amount of convection heat transfer in the structure, an amount of radiation heat transfer in the structure, humidity in the structure and/or a thermo-regulating function of the measuring device, and calculating at least one of the amount of heat loss from the surface of the measuring device, the temperature of the measuring device and/or the wettedness at the surface of the measuring device based on at least one in each of data (1) and (2), and a step (b) of calculating a thermal comfort index of the measuring device by using a result of the above calculation, are presented, whereby the thermal comfort of a structure is evaluated without using a laboratory equipment.

The invention relates to a commercially viable modular ceramic oxygen transport membrane system for utilizing heat generated in reactively-driven oxygen transport membrane tubes to generate steam, heat process fluid and/or provide energy to carry out endothermic chemical reactions. The system provides for improved thermal coupling of oxygen transport membrane tubes to steam generation tubes or process heater tubes or reactor tubes for efficient and effective radiant heat transfer.

A coating and method for overcoating a TBC on a component used in a high-temperature environment, such as the combustor section of an industrial gas turbine. The coating defines the outermost surface of the component and is formed of at least two layers having different compositions. An inner layer of the coating contains alumina in a first silica-containing matrix material that is free of zinc titanate. An outer layer of the coating contains alumina, a glass material, and zinc titanate in a second silica-containing matrix material. The outer layer of the coating has a surface roughness of not greater than three micrometers Ra and forms the outermost surface of the component. The coating reduces the component temperature by reducing the convective and radiant heat transfer thereto.

The invention discloses new nanometer ceramic high temperature resistant heat preservation paint and the preparing method and use. Its components part by weight are as follows: film forming matter 10-35, filling 50-75, ceramic micro-balloon 8-50, and modified nanometer material 3-12. The produced nanometer ceramic high temperature resistant heat preservation paint can prevent solid heat transfer and radiant heat transfer, thus it can greatly improve heat preservation effect. And its high temperature resistant can reach 1000 degree centigrade.

The invention relates to an improved method for producing silica aerogel in pure and flexible sheet form having effective suppression of radiative heat transport at high temperatures and increased thermal insulation property. The suppression of radiative heat transport was achieved by in-situ production of titanium dioxide nanoparticles in very minor concentrations during gelation of silica precursor, with nanoporous surface area more than 300 m2/g and acts as an infra red reflecting agent. When aerogel is subjected to heat during hot object insulation, it automatically turn into infra red reflecting material. Said silica aerogel can be incorporated into the inorganic fibre mat matrix individually or into two or more layers with organic sponge sheet placed in between and stitched together to form a sandwich sheet to form highly insulating flexible sheet.

A cooking structure which provide for two or more side-by-side ovens separated by vertical, movable, hinged partition(s) whereby the oven structure may function as one large oven or as two or more smaller independent ovens, wherein for each oven a tangential fan blows air substantially evenly over upper electrical heating elements strung generally from side-to-side of the oven, wherein a flow director functions as a radiant heat shield which is operator movable to either expose to or occlude from the oven cooking chamber to direct radiation from its heating elements depending on the need to roast, bake, or broil the food product. Also provided are lower electrical heating elements positioned below a ceramic cooking surface for ensuring evenness of radiant heat transfer therefrom. Also provided for is operator controlled top vs. bottom heating using a slide control that reciprocally affects the duty cycle of the top and bottom electrical heating elements, further allowing precision baking control.

A portable, durable, lightweight cooler system designed to maintain beverages, food, medical supplies, drugs, and other heat sensitive products at existing temperatures with substantially reduced heat gain or loss from the surrounding environment for extended periods of time, when no power source is available. This container is designed to greatly reduce radiant heat transfer along with conductive and convective heat transfer while diminishing decomposition effects of stored items and thus maintaining freshness. This system includes a cooler housing, a reinforced lid, a radiation reflective material application, and a system to remove air from the containment area, thus creating a vacuum within the cooler itself and sealing the lid to the cooler housing. Upon actuation of a vacuum release device, air is reintroduced into the containment area thus allowing the lid to be removed and the stored products be accessed.

A transport robot including a release-side high radiation ratio portion and a receive-side high radiation ratio portion that face each other. Heat in a substrate conducted to a base portion due to thermal conduction is released as radiant heat from the release-side high radiation ratio portion, and the radiant heat is absorbed by the receive-side high radiation ratio portion. The receive-side high radiation ratio portion is formed on a heat-receiving plate that is thermally connected to a vacuum chamber so that radiant heat absorbed by the receive-side high radiation ratio portion is transferred to the vacuum chamber. As a result, even in the case where the high-temperature substrate is transported in a vacuum atmosphere, heat from the substrate is not accumulated in a transport system, and the transport system hardly reaches a high temperature.

The present invention provides a method for drying a coating film comprising drying a coating film of an organic solvent-containing coating liquid applied to a running band-shaped flexible substrate, the drying method comprising the steps of: providing a heater at a position opposed to the band-shaped flexible substrate at a running position immediately after coating; and heating the band-shaped flexible substrate by the heater; wherein when T_W (° C.) denotes the surface temperature of the band-shaped flexible substrate; T_H (° C.) denotes the surface temperature of the heater; λ (W/m·K) denotes the heat-transfer coefficient of air; d(m) denotes the distance between the heater and the band-shaped flexible substrate (web); η denotes the efficiency of heat transfer; and σ denotes the Stefan-Boltzmann constant (5.670×10⁻⁸ W/m²K⁴), the ratio of radiant heat transfer represented by Q_R/(Q_R+Q_C) is 0.25 or more and 0.6 or less, wherein Q_C and Q_R are represented by the following equations, respectively: Q_C=λ/d·(T_H−T_W) where Q_C denotes heat transfer by air, and Q_R=η{(T_H+273)⁴−(T_w+273)⁴} where Q_R denotes heat transfer by radiant.

A cooking tray (optionally interstices-defining, microwave-transparent and providing an appropriate view factor) has a one-piece, integral, unitary construction formed of a food-grade, non-stick material suitable for use in a rapid cook oven which cooks by a combination of at least two heat transfer mechanisms selected from the group consisting of radiant heat transfer, convection heat transfer and microwave energy transfer. The construction defines a base and an upstanding peripheral sidewall about the base for the collection of solid debris created during cooking. Preferably the material is food-grade fiberglass with a non-stick coating.

On part of a surface of a metal plate that is to be heated by radiant heat transfer with a near-infrared ray, a region where reflectance for a radiant ray is made lower than that of the original surface of the metal plate is formed. As reflectance reducing treatment, painting or thermal spraying in a blackish color, plating in a blackish color, treatment for increasing roughness of the surface of the metal plate, blasting, etching, blackening, surface layer quality changing treatment of the metal plate, or the like can be adopted. The metal plate is turned into a heated metal plate partially having a different temperature by being heated by radiant heat transfer, and thereafter, the heated metal plate is subjected to thermal processing accompanied by cooling, for example, by hot stamping.

The invention discloses high-manganese medium-carbon peritectic steel continuous casting crystallizer casting powder and a preparation method thereof. 2%-8% of MnO is added into the casting powder, infrared transmitting performance of the casting powder is obviously reduced, infrared light transmittance of the casting powder is reduced, radiant heat transfer performance of the casting powder is reduced, the cracking rate can be reduced and can be effectively controlled under 0.8%, and therefore production cost is greatly reduced. Through effective control on crystallization performance of the casting powder, the condition that crystallization occurs in liquid flux films can be effectively avoided, and therefore the production accidents such as bonding and even bleed-out can be effectively avoided.

A radiation heat transfer suppressor for inhibiting heat transfer by infrared rays is provided on the external surface of the enveloping member of a vacuum heat insulator. In heat-blocking or keep warm using a vacuum heat insulator, a surface having a radiation heat transfer suppressor is faced to a high-temperature side. Thus, the vacuum heat insulator exhibits excellent heat-insulating performance in a temperature range of 150° C. or higher.

A multi-stage harvest dryer (10) is provided for drying an agricultural harvest product (12), such as, for example, corn, sunflowers, beans, seeds, etc. The dryer (10) includes multiple drying stages (14a-14d) connected in sequence to dry a volume of harvest product (12) passed from one drying stage (14) to the next. Heat exchangers (16a, 16b, 18a, 18b, 18c) are located in the stages (14a-14c) to transfer heat to the harvest product (12) in each of the corresponding stages (14a-14d). The heat exchangers (16a and 16b) are radiant heat exchangers that efficiently heat the harvest product (12) via radiant heat transfer, with heaters (19a, 19b) being provided to maintain the heat exchangers (16a, 16b) within a desired temperature range. The heat exchangers (18a-18c) are condensers that efficiently recycle the heat within the dryer (10) by transferring heat back to the harvest product (12) by condensing water that has been evaporated from the harvest product (12) elsewhere in the dryer (10).

The present invention relates to a method for forming an article having a protective ceramic coating which reduces radiation heat transport through the ceramic coating. The protective ceramic coating includes one or more embedded reflective metallic layers for reducing the radiation heat transport. The method for forming the protective coating broadly comprises the steps of forming a ceramic coating on a substrate and embedding at least one reflective metallic layer within the ceramic coating.

An inexpensive, readily visible indicator for liquid levels in a vacuum bottle that includes a coating of reflective material to minimize radiation heat transfer from the interior of the vacuum bottle to the exterior of the assembly. The vacuum bottle assembly includes a container receiving the vacuum bottle and a transparent or translucent window is located in the side wall of the container and in alignment with an interruption in the reflective coating. An indicator is located within the vacuum bottle and is aligned with both the windows and the interruption so as to be visible therethrough to provide an indication of the level of the liquid contained within the inner liner of the vacuum bottle.

A heat shield adapted to protect an engine mount is disclosed. The heat shield has a substrate positionable substantially surrounding the engine mount. The substrate has a heat reflecting surface facing outwardly away from the engine mount to block radiant heat transfer to the mount. An attachment member is attached to the substrate. The attachment member is positionable between the engine and the engine mount to fix the substrate in position. The invention further concerns a method including providing a heat shield formed of a flexible substrate, forming the substrate so as to surround the engine mount with the heat reflecting surface facing outwardly from the engine mount and attaching the substrate to the engine mount.