How to make hot temperature to cold?5 answersTo convert hot temperature to cold, various innovative methods have been developed. One approach involves utilizing a cold and hot noise source designed with a low noise amplifier and a switch to achieve different temperature outputs. Another method includes the use of a hot and cold double-temperature bracelet, where a hot bracelet contains a heater strip and a cold bracelet utilizes a substance that absorbs heat through a chemical reaction with water. Additionally, a hot temperature or cold temperature keeping container has been designed, utilizing a thermoelectric element to maintain the desired temperatures for beverages like coffee or juice. These diverse technologies showcase different ways to manipulate temperatures effectively, catering to various needs and applications.
How cold room works?4 answersA cold room operates by utilizing various mechanisms to maintain low temperatures for storage purposes. Different inventions provide insights into the functionality of cold rooms. For instance, a cold room simulator assesses thermal loads, cooling cycles, compressor work, and energy consumption. Another invention introduces a cold-resistant ice room that forms ice blocks using molds, creating cavities for ice chippings, and preserving cold through vacuum heat preservation. Additionally, a variable-size cold storage adjusts room size and blower load based on stored goods, enhancing energy efficiency. Furthermore, a tobacco leaf sampling device automates sampling above a mesh belt in a cooling area, ensuring efficient and accurate sampling. Lastly, an evaporative cooling system reduces indoor temperatures by circulating water through a heat storage structure, achieving effective cooling in summer.
What is cold room warehouse?5 answersA cold room warehouse is a storage facility designed to maintain low temperatures for the storage of various products. These warehouses are equipped with features to control temperature and humidity levels, ensuring the freshness and quality of stored items. The warehouses described in the abstracts include different features and technologies to achieve this goal. For example, Park Ki Ju et al. describe a dry and cold storage warehouse that uses carbon heater panels and a condenser to dry and maintain the freshness of agricultural and livestock products. Huang He and Liu Ping propose an aseptic low-temperature cold storage warehouse that kills microorganisms in the air and decomposes hazardous gases, preventing bacterial growth and improving storage time. Qian Yong and Wei Yong present a cold storage warehouse storing framework that facilitates automated transfer of cardboard boxes, saving manpower and enabling efficient storage. Toshinori Noda introduces a cold storage house with independently cooled storage rooms of different humidity levels, providing optimal storage conditions. Choi Jung Hoon suggests a low-temperature storage with uniform cool air supply and humidity regulation for maintaining freshness of agricultural products.
What is cold dwell fatigue?5 answersCold dwell fatigue refers to a phenomenon in titanium alloys where the presence of a dwell period at relatively low temperatures during cyclic loading leads to a significant reduction in the fatigue life of the material. This reduction in fatigue life can be as much as an order of magnitude or more. The dwell period involves holding the applied peak stress for a certain period of time. The exact mechanism of dwell fatigue is still being studied, but it is believed to be related to microstructural configurations, such as microtextured regions, rogue grain pairs, and twist grain boundaries. The presence of defects and facet formation in the α laths can also contribute to crack initiation and failure. Cold dwell fatigue has been a concern in aerospace applications, particularly in aircraft engine components, and efforts have been made to design alloys with improved dwell fatigue resistance.
How do air-cooled liquid chillers work?5 answersAir-cooled liquid chillers work by rapidly reducing the water temperature through the process of liquefying and condensing refrigerant fluid. This is achieved through various mechanisms and components such as water cooling mechanism, compression bottle, cooling box, condenser pipes, and filtering mechanism. The chiller also includes a baffle plate and drain pans to accommodate drained water. In terms of control and operation, the chiller utilizes a refrigerant pump and bypass valve to regulate the flow of refrigerant, and the condenser fan is controlled based on power consumption and ambient conditions. Additionally, the evaporator set point is adjusted to meet load conditions, and the expansion valve is controlled based on chilled water temperature or information from an air handling unit. The chiller can also be equipped with innovative control strategies to improve energy savings and increase building flexibility.
Why water can be used for cold fluid in heat exchangers?5 answersWater can be used as a cold fluid in heat exchangers due to its high specific heat capacity and density, which allows it to receive, store, and carry higher amounts of energy compared to air. Water's incompressibility and low specific volume also require smaller amounts of mechanical work for fluid circulation. Additionally, water has desirable thermal transport properties that make it a viable alternative to traditional refrigerants in heat pipes, enhancing the effectiveness of the arrangement. The heat transfer performance of a cold-water phase-change heat exchanger is significantly affected by changes in the intermediary side inlet water temperature, intermediate water flow rate, and cold water flow rate. Water is also used as heat exchange water in cooling systems to prevent oxidation and deterioration of metal materials, suppress the growth of algae and microorganisms, and reduce environmental impact. Overall, water's properties and characteristics make it an ideal choice for cold fluid in heat exchangers.