52 results about "Convection zone" patented technology

A combination convection and radiant cooking appliance includes an oven cavity, broil and bake radiant heating elements, a convection cover defining a rear wall of the oven cavity, a back panel, and a dual fan convection heating system mounted between the convection cover and the back panel. Each combination fan / heater of the dual convection heating system includes a multi-speed fan and an associated electric heating element, with the fans being vertically disposed in the oven cavity. Controls are provided to enable a user to select between at least a bake mode, a no preheat convection bake mode, a rapid preheat convection bake mode, a preheat convection bake mode and a convection roast mode.

A drying apparatus includes a hollow main body having an inside defining a water collection zone located at a lower portion thereof, a heat convection zone located above the water collection zone, and a drying zone located above the heat convection zone for drying an article to be dried. Thus, the drying apparatus produces hot air that is formed by a heat convection effect so as to dry the article placed in the drying zone efficiently, thereby enhancing the drying effect of the drying apparatus. In addition, the pivotable covers are pivoted outward to open the drying zone to allow the solar rays directly entering the main body so as to dry the article placed in the drying zone by the solar rays.

A process and apparatus are provided for steam cracking heavy feeds, including steam cracked tars. The invention heats a steam cracked tar feed to provide a depolymerized steam cracked tar containing lower boiling molecules than the steam cracked tar feed, hydrogenates the depolymerized steam cracked tar using a hydrogenating catalyst, e.g., a downward flow fixed bed hydrotreater, to provide a hydrogenated steam cracked tar. At least a portion of the hydrogenated steam cracked tar is steam cracked in a steam cracking furnace comprising a convection zone and a radiant zone.

The invention relates to a measurement method for separation of convection heat and radiant heat for a wall surface. The measurement method is performed in a rectangular room with constant-temperature regulation and control, uniform air flow of supply air and return air by an indoor air conditioner and adjustable air sending volume and air sending temperature of the air conditioner, wherein one wall is taken as the measured wall surface, the surface temperature is higher than the temperature of other wall surfaces, the heat transfer quantity of the measured wall surface and the net heat radiation quantity of the measured wall surface and other wall surfaces are respectively measured by utilizing a heat flux density meter and a net radiometer, the convection heat of the measured wall surface is obtained by using the heat transfer quantity measured by the heat flux density meter to subtract the net heat radiation quantity measured by the net radiometer according to the heat balance principle of the wall surface, and the convection heat and the radiant heat of the measured wall surface are further separated. According to the measurement method provided by the invention, the load of a wall body is directly obtained by measuring the heat transfer quantity and the net radiation quantity of the wall body, the method is simple and convenient, the physical significance is clear, and errors between theory and reality caused by the load of the wall body when a reaction coefficient of theoretical calculation is adopted for calculation can be avoided.

The invention relates to a tube heating furnace low-calorific value fuel gas stable combustion method. The method comprises following steps: a fuel gas low-dropout pre-heater is added to a convection zone of a tube heating furnace, low-calorific value fuel gas is pre-heated to 100-500 DEG C through the fuel gas low-dropout pre-heater firstly, and then the low-calorific value fuel gas is introduced into the tube heating furnace; high-calorific value fuel gas is employed as the auxiliary blending fuel gas and is introduced into the tube heating furnace through an auxiliary blending fuel gas pipeline; normal temperature air is employed as the combustion air, is not required to be re-heated, and is sent to the tube heating furnace through a negative pressure suction manner or a blower fan; and finally stable combustion is carried out in the tube heating furnace. Compared with the prior art, the method has obvious application values in the field of the tube heating furnace combusting low-calorific value fuel gas, an operation period is long, the reliability and the security are high, the engineering investment is saved, and an improved method is provided for stable combustion for the tube heating furnace employing the low-calorific value fuel gas.

A vapor chamber and a method of manufacturing same are disclosed. The vapor chamber includes a main body internally defining a chamber. The chamber internally has a plurality of flow guides and contains a working fluid; and at least one flow passage is formed between any two adjacent flow guides, such that the flow guides and the flow passages together define a flow guiding zone in the main body. The flow guiding zone has two opposite ends respectively connecting with a first convection zone and a second convection zone, such that the flow passages and the first and second convection zones communicate with one another. With the main body and the internal flow passages for a vapor chamber being integrally formed by aluminum extrusion, the time, labor and material costs for the vapor chamber can be largely reduced.

A system to reduce drafts in front of a window is described. The system includes a window covering and a motor and gearbox that adjust the window covering. The system also includes a first temperature sensor, a second temperature sensor, and a microcontroller networked to the motor and temperature sensors. The first temperature sensor is positioned above the window covering within a thermal convection zone of a window associated with the window covering, and the second temperature sensor is positioned below the window covering within the thermal convection zone. The microcontroller instructs the motor to adjust the window covering based on a temperature gradient from the first temperature sensor to the second temperature sensor.

The invention discloses a heat exchanger for slow cooling and preheating of an isothermal normalizing furnace. An upper layer of combustion flue and a lower layer of combustion flue are arranged in a furnace body of the isothermal normalizing furnace; a preheating section is arranged at the front end of the upper layer of combustion flue; a heating insulation section is arranged at the middle and rear end of the upper layer of combustion flue; a slow cooling section is arranged at the front end of the lower layer of combustion flue; a rapid cooling section and an isothermal section are sequentially arranged on the middle and rear end of the lower layer of combustion flue along the conveying direction of materials; and transmission net bands are arranged inside the upper layer of combustion flue and the lower layer of combustion flue. Particularly, the furnace body forms a heat convection zone at the front ends of the upper and lower layers of combustion flues in a penetrating manner while the heat exchanger is arranged inside the heat convection zone, and is provided with a fan at the top of the heat convection zone, and an air flue which extends to the lower layer of combustion flue in a semi-closed manner; and air inside the heat convection zone flows through the upper layer of combustion flue, the fan and the air flue from the lower layer of combustion flue in an internal cycle. By application of the heat exchanger disclosed by the invention, the internal cycle speed for slow cooling and preheating of the isothermal normalizing furnace can be controlled, full recycling utilization of heat energy is greatly improved, and the industrial production requirements of outstanding energy conservation and emission reduction are met.