Complex Energy Saving Solution
In recent years, with economic development and change of life style of people, the business form of shopping malls has been shifting from pure selling of commodities to an integration of leisure, entertainment, shopping and catering. This change has resulted in more complicated and variable A/C load of shopping malls.
Related data indicate that for a shopping mall, energy consumption for lighting accounts for about 40% of the total consumption. Lift and A/C system respectively account for about 10% and 50% of the total energy consumption. A/C load in shopping malls has the following characteristics:
The large-area curtain wall looks quite appealing. However, it increases daytime lighting load; sufficient indoor lighting guarantees premium shopping experiences of customers. However, it increases generation of heat. Visit flow in shopping malls is heavy, and the humidity load is also high.
In order to create a pleasant shopping and consumption environment for customers, the A/C system often operates for an extended period of time in shopping malls.
Significant Variance of Load:
The A/C load is closely related to a number of factors including the operation function of the zone, whether it is used for catering or cinema. The thermal and humid loads vary greatly in different time periods. The open-type courtyard of large shopping malls facilitates vertical circulation of air. However, it also aggravates temperature stratification, which means lower floors usually have a lower temperature.
As a globally leading supplier of one-stop building solutions, Guolian Green Technology provides top-quality heating/ventilation and automatic control equipment including chiller, automatic control system and air handling unit to guarantee a comfortable indoor environment for the shopping mall. At the same time, Guolian Green Technology has been focusing on high-energy-efficiency solutions, which aim to reduce overall energy consumption of A/C system and contribute to environment protection and energy conservation of shopping mall customers.
Considering the characteristics of A/C systems in a shopping mall, Guolian Green Technology carries out overall optimization of the A/C system in a targeted manner for the chilling station, distribution and transmission system and end system, so as to lower the energy consumption of A/C system in shopping malls to the greatest extent.
For the Metasys system of Guolian Green Technology, the integrated high-efficiency machine room control strategy is adopted. Based on its rich experience and expertise on chillers, the chiller, water pump and cooling tower are controlled in a centralized way. Parameters such as the number of operating chillers, outlet water temperature, number of operating water pumps, operation frequency and cooling water temperature are adjusted, so as to achieve the optimal energy efficiency of the chiller plant.
Furthermore, the flow balance valve of Guolian Green Technology is able to adjust flow of chilling water within the control range automatically depending on change of the end load, so as to effectively prevent regional over-cooling and overheating and reduce excessive transmission of water pump, thus lowering energy consumption of distribution and transmission system.
For operation and management of the end system, commonly used adjustment modes are embedded into DDC of the Metasys system of Guolian Green Technology. Through optimization of start/stop time, variable-frequency control of fan delivery and fresh air volume control by enthalpy value, and other adjusting measures, the energy consumption of end system is remarkably reduced. The adjustment effect of the system will not be compromised due to difference of commissioning operators.
In the energy conserving transformation projects of commercial buildings implemented across the world, engineers of Guolian Green Technology would personally visit the site to gain a better understanding of customer needs, system configuration and existing issues, and would analyze the equipment operation data. This way, they would be able to present each customer with a customized comprehensive solution that involves frequency conversion renovation of chilling unit, optimized control of terminals, fresh air system renovation, garage exhaust system control, machine room group control, heat recovery renovation, commissioning of water balance and wind balance, lighting system upgrading, lighting control system, transformation of garage intelligent monitoring system and fire fighting and security transformation. After implementation of the projects, a great amount of operation expense is being saved for customers. The energy conserving efficiency has been well received by our customers.
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