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所在平台: Udemy |
课程主页: https://www.udemy.com/course/hvac-learn-load-calculations-for-cold-room-and-cold-storage/
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**课程名称：HVAC：学习冷藏室和冷库的负荷计算** **课程概述：** 本课程专注于冷库的设计，特别是冷藏室的制冷负荷计算。冷库是一种能够将产品冷冻、冷藏或保持在低温的系统，其设计目的是维持适合产品质量的温度和湿度平衡，从而延长易变质产品的保质期。 课程重点讲解以下几点： * **产品负荷：** 产品负荷通常占制冷负荷的55%-75%，包括新产品进入冷库时引入的热量，以及将产品冷却、冷冻和冷冻后进一步降温所需的能量。 * **显热与潜热：** 如果只是冷却产品，只需考虑显热负荷；如果需要冷冻产品，则需要考虑潜热，因为此时会发生相变，尽管温度变化不大。 * **包装材料：** 包装材料本身也需要被冷却，因此也需要计入负荷计算。 * **农产品呼吸热：** 对于水果和蔬菜等鲜活产品，它们会自行产生热量，这部分热量也需要被考虑在内。 课程将通过详细的公式、技巧以及实际案例研究（包括2°C冷藏室和鱼类冷冻厂的负荷计算）来阐释这些概念。 **课程结构：** * **Lecture 1:** 冷库简介 * **Lecture 2:** 冷藏室制冷负荷计算概述 * **Lecture 3:** 冷库制冷负荷计算实用技巧 * **Lecture 4:** 2°C冷藏室负荷计算案例分析 * **Lecture 5:** 鱼类冷冻厂负荷计算案例分析
Cold storage is a system that allows the product to be kept frozen or cold or at low temperatures. The purpose of the cold storage design is to maintain temperature and humidity balance appropriate to the quality of product. In this way, products with deterioration risk can be preserved for a long time.This course on cold storages focusses on design of cold storages especially the cooling load calculations for cold rooms Product loads account for typically 55-75% of the cooling load. This accounts for the heat that is introduced into the cold room when new products enter. Its also the energy required to cool, freeze and further cool after freezing. If you're just cooling the products then you only need to consider the sensible heat load. If you're freezing the product then you need to account for the latent heat also as a phase change occurs. During this time energy is used but you will not see a temperature change while the product changes between a state of liquid and ice. There is additional energy required to further chill this food down below the freezing point which is again sensible heat. You also need to account for the packaging as this will inherently be cooled also. Lastly if you're cooling fruit and vegetables then these products are alive and they will generate some heat so you'll need to account for the removal of this too.All these concepts are explained long with the formulas and tips in the below mentioned lecture series Lecture 1:Introduction to Cold StoragesLecture 2:Overview of Cooling Load Calculations for Cold roomsLecture 3:Cooling load calculations for cold storage some useful tipsLecture 4:Load Calculations of cold storage at 2 deg Celsius: Case studyLecture 5:Load Calculations case study:Fish freezing plant
