Cold Storage and Release Characteristics of a Thermal Battery Unit Using Solid Nitrogen and Solid Nitrogen Impregnated in Metal Foam
Large cold storage capacity is very important to maintain the stable working condition of a superconducting magnet. Solid nitrogen is frequently used for cold storage at cryogenic temperatures. In this paper, we report the experimental investigation of the cold storage and cold release characteristics of a thermal battery unit using solid nitrogen, as well as the combination of solid nitrogen and copper foam under different conditions. In order to enhance the heat transfer without significantly compromising the cold storage capacity, the copper foam is adopted to enhance the effective thermal conductivity of solid nitrogen. It is found that the copper foam can effectively enhance the cold release process, making the cold energy stored effectively utilized.
Smart Cold Storage and Inventory Monitoring System
Internet of things technology is adopted in every field. Our proposed Smart cold storage and inventory monitoring system uses sensor-based IoT technology to offer remote monitoring and tracking the produce. Our paper proposed methodology is early warning alerts and notifications in critical conditions. It enables end-end visibility and accountability across the entire product value chain. The perishable goods are often required to travel thousands of miles by land, air, water transport facilities to reach their final destination. It creates a lot of pressure on tracking the companies using the cold storage supporters for the distribution of the food and maintain a certain temperature during the entire journey. This mainly causes a panic situation for the business owners, stakeholders and industrialists. It may also cause damage to the inventory system and time. Our system enables endless real time monitoring. It helps in controlling the losses which occur for business. As per the research India has 7645 cold storage facilities, out of these about 68% is used to store vegetables. And remaining 32% is used for storing other commodities. In the proposed cold storage system Temperature and Humidity sensor, Ultrasonic sensor, Wi-Fi enabled microcontroller board and Mobile application are used.
Impregnation of porous material with phase change material for thermal energy storage
Abstract In order to efficiently recover waste heat in the form of latent heat, we studied the impregnation of a porous material with a phase change material (PCM); erythritol was selected as the PCM and expanded perlite (EP), diatom earth (DE), and gamma-alumina (GA) were selected as porous materials. Effects of vacuum in impregnation, pore size of porous materials, holding time and cyclic test on thermal properties of composites; latent heat, melting temperature, were mainly examined by using DSC. The following results were obtained. (1) The pores of EP were completely filled with liquid erythritol by the vacuum impregnation treatment, and the latent heat of the EP/erythritol composite reached 83% of the theoretical latent heat of pure erythritol (294.4 J g−1). (2) Porous materials with small pore sizes showed a low melting temperature for phase change composites. (3) The pores of EP were completely filled with erythritol at 1.8 ks immersion in the vacuum impregnation treatment. (4) EP/erythritol composite retained 75% of the impregnated PCM, even in a cyclic process of heating and cooling. In conclusion, the impregnation of porous material with erythritol is a promising method for conserving latent heat with high thermal storage density.