The completion and delivery of the cold storage construction project for the Xizang specialty agricultural and livestock products trading market

The Xizang Specialty Agricultural and Livestock Products Trading Market Cold Storage Construction Project is a large-scale aquatic and meat wholesale market's core low-temperature storage facility developed by our company based on the high-altitude regional characteristics and industrial development needs of Xizang Lhasa. With the core objectives of ensuring the quality of specialty agricultural and livestock products and facilitating cold chain logistics channels, the project establishes a modern cold storage system adapted to the high-altitude environment of western regions through customized cold storage design, advanced refrigeration technology applications, and stringent construction standards for plateau areas. This initiative injects strong momentum into the cold chain industry development of Xizang and the entire high-altitude western region.

I. Core Types of Cold Storage: Detailed Analysis of Low-Temperature Storage Cold Stores for Large Aquatic and Meat Wholesale Markets

The cold storage facility constructed for this project is a dedicated low-temperature storage facility for large-scale aquatic and meat wholesale markets, with a capacity exceeding 5,400 square meters and a storage capacity of 7,000 tons. It serves as a core hub facility within the cold chain logistics system. Its primary function is to provide long-term, stable deep-freezing storage environments for temperature-sensitive products such as aquatic products and meat, maintaining a constant temperature below-18°C. This temperature control effectively inhibits microbial proliferation and enzyme activity, delaying product oxidation and spoilage. As a result, the shelf life of meat products can be extended to 6-12 months, while aquatic products retain their freshness and nutritional value, ensuring food safety from the source.

This type of cold storage facility boasts three core advantages: First, large-scale storage capacity, which meets the needs of bulk procurement and centralized storage for large wholesale markets, thereby reducing unit storage costs; Second, end-to-end quality assurance through deep low-temperature environments and intelligent temperature control systems, effectively blocking the spread of pathogenic bacteria such as Salmonella and Listeria, while enabling real-time monitoring of temperature and humidity data with cloud-based traceability, complying with HACCP food safety certification requirements; Third, supply chain buffering functionality, allowing centralized stockpiling during peak seasons for aquatic and meat products, followed by stable market release during off-seasons to balance supply and demand, mitigate price fluctuations, and provide stable warehousing support for Xizang's specialty agricultural and livestock products to "leave Tibet and enter the market."

II. Core Technology: Bucket Pump Liquid Supply Refrigeration System, Demonstrating Extreme Energy Efficiency Advantages

The refrigeration system in this project employs an industry-leading drum pump liquid supply method, featuring core advantages of "high-efficiency circulation, precise liquid delivery, and energy conservation," making it perfectly suited for large-scale low-temperature cold storage requirements. Its working principle involves: After throttling, the low-temperature refrigerant liquid first enters a fluorine drum equipped with gas-liquid separation capabilities. A fluorine pump then forcibly delivers multiple times the evaporation volume of low-temperature liquid to evaporators in various storage rooms. Part of the liquid vaporizes upon heat absorption in evaporators, returning to the fluorine drum along with unvaporized liquid. After gas-liquid separation, the gas is absorbed by the refrigeration compressor, while the separated liquid re-enters the circulation process with newly replenished refrigerant. Compared to traditional direct expansion liquid supply methods, this system demonstrates significant energy-saving benefits, specifically manifested in the following aspects:

Firstly, it enhances heat transfer efficiency and reduces energy consumption losses. The drum pump liquid supply system enables full liquid operation of the evaporator, with the refrigerant circulation rate exceeding three times the evaporation capacity. This significantly increases the refrigerant flow velocity within the tubes, ensuring thorough contact with the evaporator's inner surfaces and substantially improving heat transfer coefficients. Simultaneously, it effectively reduces the heat transfer temperature difference across the evaporator, expands the effective heat exchange area, and achieves notable improvements in refrigeration efficiency compared to traditional systems. Data indicates that this system can significantly boost the refrigeration system's coefficient of performance (COP), with compressor operational efficiency increasing by over 5%.

Secondly, optimizing system operational conditions reduces unnecessary energy consumption. The gas-liquid separation function of the fluorocarbon tank prevents refrigerant liquid from entering the compressor, thereby avoiding wet stroke issues and significantly lowering suction superheat. This not only enhances compressor stability but also markedly reduces exhaust temperature and minimizes energy waste. Additionally, the system enables precise load regulation through adjustable fluorocarbon pump operation and compressor output, offering multi-level capacity control (25%,50%,75%,100%). This smart adjustment precisely matches refrigeration demands across varying storage volumes and ambient temperatures in cold storage facilities, effectively addressing the energy inefficiency common in traditional systems characterized by "full-load operation with low-demand consumption."

Thirdly, the defrosting process is simplified to reduce energy consumption. The drum pump liquid supply system can be equipped with thermal fluorocarbon defrosting functionality, utilizing the heat released from compressor-discharged fluorocarbon vapor to melt frost layers on evaporator surfaces. This solution effectively addresses two key challenges: the high energy consumption of traditional electric defrosting methods and the risk of ice formation during low-temperature water flushing. Compared to electric defrosting, thermal fluorocarbon defrosting reduces energy consumption by over 60% during the defrosting phase while preventing significant temperature fluctuations in storage environments that could compromise product quality.

Fourth, long-term operation demonstrates significant energy-saving benefits. Calculations show that large-scale cold storage facilities using drum pump liquid supply systems can achieve annual electricity savings of 15%-20%. Based on the project's scale, this translates to over 130,000 kWh of energy conservation annually. At Lhasa's local electricity rates, the additional equipment investment can be recouped within one and a half years, yielding substantial long-term energy and economic returns. Additionally, oil from refrigerant can be effectively separated in fluorine drums and recycled to compressors, preventing lubricant buildup on evaporator surfaces that would compromise heat exchange efficiency. This design not only extends equipment lifespan but also reduces operational and maintenance costs.

III. Construction Challenges: Confronting the High Altitude Environment of Lhasa and Overcoming Multiple Construction Difficulties

The project location, Xizang Lhasa, is located in a high-altitude area with an average elevation exceeding 3,600 meters. The extreme natural environment has brought numerous unprecedented challenges to the installation and construction of cold storage facilities.

IV. Project Value: Promoting High-Quality Development of Cold Chain Industry in High-Elevation Regions of Western China

The implementation of the Xizang characteristic agricultural and livestock product trading market cold storage construction project not only fills the gap of large-scale specialized aquatic and meat low-temperature storage cold storage in Lhasa, but also plays a milestone role in promoting the development of cold chain industry in high-altitude areas of western China.

From the perspective of regional industrial development, the project provides professional low-temperature storage support for Xizang yak meat, Tibetan fragrant pigs, cold-water fish, and other specialty agricultural and livestock products, effectively addressing the pain points of "difficult storage, high loss rates, and narrow distribution range" for specialty agricultural products, and promoting the large-scale and standardized development of "exporting Tibetan products." Leveraging the supply chain buffering function of cold storage, it can establish a cold chain channel from "origin procurement to centralized storage and nationwide distribution," facilitating the connection of Xizang's specialty agricultural and livestock products with the national market, enhancing product value-added, increasing farmers' and herders' income, and injecting momentum into rural revitalization.