Modeling and Numerical Simulation of Heat Transfers in a Metallic Pressure Cooker Isolated with Kapok Wool

In this work, a numerical study of heat transfers in a metallic pressure cooker isolated with kapok wool was carried out. This equipment works like a thermos, allowing finishing cooking meals only thanks to the heat stored at the beginning of cooking, which generates energy savings. Cooked meals are also kept hot for long hours. In our previous work, we have highlighted the performances of the pressure cooker when making common dishes in Burkina Faso. Also, the parameters (thickness and density) of the insulating matrix allowing having such performances as well as the influence of the climatic conditions on the pressure cooker operation were analyzed in detail in this present work. The numerical methodology is based on the nodal method and the transfer equations obtained by making an energy balance on each node have been discretized using an implicit scheme with finite differences and resolved by the Gauss algorithm. Numerical results validated experimentally show that the thickness of the kapok wool as well as its density play an important role in the pressure cooker operation. In addition, equipment performances are very little influenced by the weather conditions of the city of Ouagadougou (Burkina Faso).

Optimum Inclination Angles of Booster Mirrors and Solar Radiation Availability on the Horizontal and Inclined Box Type Solar Cookers

Mathematical relations are developed to compute optimum inclination angle of booster mirror for horizontally placed cooker (λ) and for optimally inclined cooker (ψ) during all months (selected day) of the year at 30°N latitude for maximizing the reflected component of solar intensity onto the absorber plate of the cooker. A solar radiation model is also developed and used to compute the ratio of various solar intensities on horizontal, inclined and normal surface of the absorber plate for all months at 30°N latitude. These ratios give a clear indication of greater solar radiation availability on the optimally inclined cooker as compared to the horizontally placed cooker for faster cooking especially during winter months when solar radiation capture is small. Experimental validations have also been performed to access the accuracy of the developed relations and model.

Performance Assessment of a Box Type Solar Cooker Using Jatropha Oil as a Heat Storage Material

Solar cookers are a good option in developing countries with high solar potential for environmentally friendly cooking and reduced pressure on forests. However, they are still affected by the intermittency of the sun. In order to overcome this problem, in this work, a box type solar cooker integrated Jatropha oil as a heat storage material is fabricated and experimented with. The design was examined with a maximum stagnation temperature of 157.7°C. The recorded cooking power vanished between 78.4 and 103.6 W, while thermal efficiency varied from 41.26% to 58.78%. The energy transfer cycle test, including charge and discharge revealed that 91.18% of the heat lost through the cooker could be recovered by the heat storage unit and a large amount is restored to the system during cloudiness or a temperature perturbation.

Numerical Study of a Cylindro-Parabolic Cooker “Blazing Tube”

The objective of this work is to numerically determine the thermal performance of the parabolic cylinder cooker commonly “blazing tube”. These performances were determined by establishing heat balances at the different levels of the system. The equations obtained have been discretized;simplifying assumptions have been made to facilitate their resolution. We adopted Gauss Seidel’s method using MATLAB software to solve these equations. The temperatures of the coolant, the glass and the absorber were determined as a function of time and along the tube. The thermal efficiency was also determined. It emerged that the different temperatures evolve linearly as a function of the length of the tube. Yield and temperatures depend on the amount of sunshine.

Theoretical and Experimental Studies of a Box-Type Solar Cooker in Unfavorable Climatic Conditions

A box-type solar cooker with an inclined surface, equipped with a concentration reflector to allow maximum energy to be collected, enabled cooking tests to be carried out in the rainy season. Different thermocouples were implanted on various places of the cooker. The temperature measurements from these sensors were taken every 10 minutes. The tests presented in this article relate to the preparation of eggs and rice. The absorber temperatures during the tests exceeded 100°C. The cooking times were between 1 h 50 min and 2 h 20 min despite the numerous cloudy periods. The cooker made it possible to reach sufficient temperatures for healthy cooking of food. The results obtained for these first tests are satisfactory and very encouraging.

Finite Element Modeling of a Solar Box Cooker: Temperature and Fluid Velocity Distributions

We studied the temperature distribution and fluid velocity in a box-type solar cooker by using the Finite Element Method (FEM) in Ziguinchor southern of Senegal. Indeed, this is one of the sunniest countries in the world: more than 3000 hours of sunshine per year with an average temperature of around 30˚C. This abundant and exploitable solar energy contributes to the development of more efficient, profitable and clean sources of energy. This will help to satisfy the increasing demand of energy. This numerical model was validated by comparing the numerical results with those of the experiment carried out on a single day. The relative error obtained is below 3%. The model results confirmed the performance of this cooker as its cooking temperature is available for more than seven hours. They have shown that the temperature and internal fluid velocity fields are not homogeneous. The results, although preliminary and encouraging, are a first step towards the complete simulation of a solar cooker integrated into a drying column.

Experimental Study of a Metallic Pressure Cooker Insulated with Kapok Wool

This work is devoted to an experimental study of metallic pressure cooker insulated with kapok wool, a vegetal biodegradable fiber. Experiments conducted on the cooling of hot water in the equipment revealed very low heat losses and a time constant of 60 hours on average. As a result, the equipment makes it possible to finish cooking meals only thanks to the heat stored at the beginning of cooking and keeps cooked dishes warm for long hours. The thermal phase shift of the pressure cooker is around 7?h. Cooking tests conducted on some local dishes revealed about 70% butane gas savings for cooking cowpea and white rice, 38% for cooking fatty rice, 75% for pasta and couscous, and 30% for cooking potato stew. These results show that this technology can contribute to minimizing?energy consumption in the restaurant sector.

Solar Cookers for Fish Village

Collecting wood was areal pain in the fore-head. We used to goto the forest to collectwood thirty times or so eachwinter regardless of the snowor wind. We had to get up anhour or so after midnight andafter doing our chores wewould head off to the forest.We didn’t return until dusk,"said Ms.Zhongcujia,aged 52and a resident of Niamu orFish Village,located in JiancaCounty,Malho TibetanAutonomous Prefecture,Qinghai Province,China. FishVillage is nestled on a denud-ed west-facing mountainslope.

实施生产许可的压力锅产品产业情况报告

通过对压力锅产品情况,行业状况的和市场情况的概述,对压力锅产品的产业政策情况,标准情况,技术发展状况和生产许可对行业的技术要求的调研。提出了对实施生产许可的压力锅产品质量安全风险,生产加工过程风险分析,产品质量安全风险因子分析,产业风险情况,产业政策风险,公众安全风险的情况分析。

电饭煲中桶模具设计

对电饭煲中桶结构进行分析,设计了1副两板模,定模部分对多种不同结构的扣位进行成型,在定模设计了相应的滑块机构,为了驱动定模滑块脱模,在模架侧面安装辅助开模机构,将第1次开模设在定模座板与定模板之间。根据动模部分成型不同结构的扣位,分别设计了内滑块脱模结构和斜推脱模结构。模具采用普通流道浇注系统,从待成型塑件上端圆孔的内壁以4个潜伏式浇口进料。为了使模具温度均匀,在定模设置了直通水路,在动模设置了隔片式水井水路。

电磁炉骚扰电压不合格的应对措施

电磁炉在日常监督抽查中经常出现骚扰电压不合格的情况,。本文主要研究电磁炉骚扰电压测试不合格的原因及其抑制对策,通过增加滤波器等方式可以使其满足标准GB4343.1-2018的要求。本文从实际情况出发,为厂家提供一些解决方案,使其产品能通过电磁兼容测试。

谐波导致电磁炉加热失效的机理研究

近年来,谐波畸变导致电磁炉加热失效的问题时有发生,但机理不明。针对上述问题,从仿真和实验测试的角度探讨了电磁炉加热失效原因,首先搭建了电磁炉控制模型,分析了电磁炉保护配置对电磁炉正常工作的影响;其次,基于可编程电源开展了电磁炉谐波适应性测试,验证了浪涌保护动作是导致电磁炉无法正常工作的直接原因,而谐波产生的瞬时过电压是导致浪涌保护动作的根本原因。研究结论对于解决谐波导致电磁炉加热失效问题具有重要理论价值。

浅述新版GB4706.19第19.4条对电压力锅过压保护的影响

新版GB 4706.19对不同结构的电压力锅考核内容发生了很大变化。新版标准要求电压力锅的过压保护装置必须满足更高的安全和质量要求,以保障用户的使用安全。本文分别对两种非弹性结构压力锅和两种弹性结构压力锅的工作原理进行了详细分析,并提出了如何应对新版标准的过压保护措施。

An Economic Pressure Cooker

China’s PPI growth continues to risers its CPI growth keeps dropping. What does this mean for industry and the economy?

基于感性工学的智能电饭煲CMF设计研究

为满足消费者多元需求,对产品设计提出更高要求,尤其是在物质满足基础上,人们开始产生更多情感诉求。由此,使得感性工学得到广泛应用,在实际应用中更加注重产品感觉和体验,目的在于凸显个性化、差异化设计目标。本文在明确感性工学和CMF设计后,分析消费电子产品CMF设计原则,并结合智能电饭煲展开具体探讨和研究。

使用压缩空气测量家用燃气灶具热负荷的试验设备设计

设计了一种使用压缩空气测量家用燃气灶具热负荷的试验设备,与使用明火测量灶具的热负荷相比,该设备更安全、环保、简单、准确、快速、经济。此外,阐述了设计过程中遇到的一些技术要点,如灶具旋钮机械手的设计、热负荷测量部分内部阀门的设计、流量采集和参数处理、空气干燥和密度修正等。

智能电饭锅软件功能安全评估案例分析

本文以典型产品智能电饭锅为案例,探讨智能电饭锅在执行GB 4706.1/IEC60335-1及产品特殊标准第19章非正常工作试验过程中过热保护电子电路及其评估试验,并分别从硬件电路实现和软件功能保护设计两个部分分析其在标准要求的非正常工作条件下的安全保护技术要求,为典型智能电饭锅产品的软件功能安全评估工作提供了借鉴和参考。

高效节能厨卫电器产品减碳评价方法研究

随着我国双碳政策的推进,厨卫电器产品也正面临着向节能低碳转型。然而,目前减碳评价技术和标准还不够完善。本文针对产品全生命周期最重要的环节“使用阶段”进行减碳评价方法研究,并在现有“减碳量”核算模型基础上,提出了基于“碳效比”概念的厨卫电器产品低碳评价方法。本文以电磁灶、电饭锅典型产品为例,通过研究基于热效率的能效表征参数方法核算产品减碳量和碳效比,核算结果表明该类产品减碳量可以比较直观反映产品低碳效果,但不能真实反映产品低碳技术的高低,需要“减碳量”和“碳效比”两者的结合,才能更好地客观评价高效节能厨卫电器产品减碳能力。

PRESSURE COOKER

Many children in China have been robbed of childhood joys and developed emotional problems Cen Cheng, a primary school student in Beijing, is only seven years old, but, at his parents' direction, he is already making preparations for entering university 10 years from now. Things are not going smoothly. Recently, his attention has begun to wander. He often feels uncomfortable. Sometimes he loses his appetite and sometimes he is gluttonous. A medical checkup indicates he has no physical disease, and his pe...

基于计算机视觉的电饭煲内胆缺陷检测系统设计

针对目前电饭煲生产企业的高度自动生产线,电饭煲内胆在生产过程中偶尔会存在一些瑕疵,人工检测无法理想地检出问题,文中提出一种基于计算机视觉的检测系统,结合人工智能技术,构建先进电饭煲内胆缺陷检测系统,代替人工检测。该缺陷检测系统包含工业快速照相机、光源、镜头、支架和视觉检测软件,将采集电饭煲内胆有缺陷数字图像,通过图像标注、神经网络进行深度学习训练,获取最佳检测模型,对实时生产线上的电饭煲内胆进行检测,并通过算法不断优化、迭代,找到最优方案。最后应用到具体企业生产线上,使用真实电饭煲内胆数据集对系统进行测试,测试结果表明:智能缺陷检测系统能有效代替人工检测电饭煲内胆有碰伤、刮花、麻点、堆油等缺陷,检测速度、检测准确率明显提高,且满足生产线对于实时性的要求。