Interview with Huang Shixian Da Zhang Wenzhong: Parallel controller wins

At the Tenth Qianghua Refrigeration Exhibition held in Hangzhou, China in December 2009, the new XBJ series parallel controllers exhibited by Huangshi Xianda were highly concerned by industry insiders and held in Beijing on April 7th. This new product of the 22nd China Refrigeration Exhibition was also enthusiastically received by the participants. For this reason, the reporter interviewed the head of the Huangshi Xianda Electronics Research Institute Zhang Wenzhong at the China Refrigeration Exhibition.

Reporter: Can you tell us why your XBJ series parallel controllers have become popular at China's two largest refrigeration exhibitions?

Zhang Zhang: This is the first time that it has caught up with the current parallel group in the large and medium-sized refrigeration equipment market is gradually replacing single-unit units. This is a good time for the market to need how many parallel groups will require the controller of the number of parallel groups, so the market needs of parallel controllers The amount is very large.

Reporter: Is this "catch-up" a careful analysis and is it prepared to close your eyes and "hit on"?

Zhang: Of course it is the former. It can be said that after many years of observation and in-depth market research, we have scientifically predicted this trend, and then developed the XBJ series parallel controllers in advance.

Reporter: Can you tell us what basis you are predicting that the parallel group will gradually replace single-unit units in the large and medium-sized refrigeration equipment market?

Zhang Zong: There are two main aspects: First, from the perspective of the product itself, the parallel group has many advantages over the single unit. The parallel refrigeration unit adopts the advanced refrigeration design concept—through the parallel connection of multiple compressors, under the group control of a dedicated controller, the number of the compressor's worktables is automatically adjusted to match the ever-changing demand for refrigeration, so that the refrigeration system is always maintained The most efficient state. Therefore, the average efficiency of the parallel connection group is 30-60% higher than that of the stand-alone unit, depending on the cooling system.

In addition to high-efficiency energy-saving, the parallel group also has compressors, accumulators, oil separators, gas return manifolds, and liquid supply manifolds, all of which are grouped together to minimize the space occupied by the equipment after ensuring sufficient operating space, and to fully save energy. Room area; Highly integrated, reducing the consumption of pipelines and cables, shortening the construction period; Multiple units running in parallel, can automatically balance the running time of each machine head, so that the life of the unit can be extended by more than 30% compared with the single unit and at a certain station. When the compressor fails, other compressors can still work normally, guaranteeing customers' unique advantages such as normal production.

Reporter: What about the second aspect?

Zhang Zhang: That is the change in market trends. In recent years, China's commercial refrigeration systems have begun to develop in the medium-to-large-scale, that is, manufacturers and contractors of refrigeration units usually talk about the past, the past refrigeration units are to do small, now the refrigeration unit is to do bigger. Stand-alone systems have gradually been unable to adapt to the needs of medium and large-scale refrigeration applications.

Reporter: What are the specific aspects of performance?

Zhang Zong: As in the past, most of our country's rural areas were farmers who built small cold storages to store fruits, vegetables and meat. In recent years, large-scale cold stores have been established by professional breeding households and refrigeration engineering companies in fruit, vegetable, and meat production areas. Farmers store their own fresh food in these cold storages to pay rent. Such a cold storage is many times larger than the cold storage of a single farmer. For instance, Beijing Hongyuan is a manufacturer and engineering supplier of refrigeration units. In recent years, it has relied on Beijing Xindi Market to build some large-scale cold storages, and it has been renting fruit and vegetable meat for business households and local farmers. They are now mainly engaged in the design and installation of large and medium-sized cold storage facilities. In 2009 alone, they had done nearly 10 large-scale cold storage of more than 1,000 square meters. Obviously, such a large-scale cold storage is extremely uneconomical if it is operated with ordinary single-units, regardless of the economical or equipment-use life.

On the other hand, commercial refrigeration equipment used in supermarkets and other industries is also growing. In recent years, most of them have merged traditional stand-alone systems into large-scale central freezing stations and a parallel compressor system (commonly referred to as Rack in foreign industries). The compressors are connected in parallel on a common rack and share components such as the suction and exhaust manifolds, condensers, and reservoirs to provide refrigerant to the evaporation ends of the entire refrigeration system. This is even more difficult for a single flight crew.

Reporter: These two points are sufficient to fully illustrate that the parallel group will gradually replace single-unit units in the large and medium-sized refrigeration equipment market. This is the general trend, but why this trend has not been prominent in the market in recent years.

Zhang Zong: Because the trend is still not clear, the domestic parallel controller market is still dominated by foreign products. High prices of foreign products and unsatisfactory after-sales services make our products particularly welcome. But I think from this year onwards, this trend of replacing individual units with on-line groups will start to become clear – some manufacturers of refrigeration units we are working with or familiar with are planning to put large-scale production parallel groups this year, such as Tianjin Daming’s production of parallel groups for many years. , The largest 8 parallel machines, but has not been mass production, only tailored to find customers, but now is preparing for large-scale production. Tianjin Danhua also plans to mass-produce screw parallel units this year.

Reporter: It seems that scientifically predicting the trend of this market change early on does not mean that you have seized the opportunity and won the time.

Zhang Zong: It was an important condition for the product to open up the market when it was won. However, to occupy the market for a long time, it depends on the internal things of the product itself. In this regard, our XBJ series parallel group controller has its unique advantages.

Reporter: Then please brief us about it.

Zhang Zong: The most outstanding advantage of the XBJ series parallel controller is that it is controlled by pressure (it has 7 temperature sensors, of which 6 exhaust temperatures - 1 suction temperature - 1 exhaust pressure transmitter , - 1 suction pressure transmitter to regulate the operation of the unit, and most of the parallel controllers in the domestic market are temperature controlled. Pressure control is more precise than temperature control, making the parallel group more energy efficient. For example, a large-scale cold storage facility that Beijing Hongyuan did last year adopted a parallel-connected group controller. It is estimated that the energy savings of the single-unit unit will be 50-60%. If the temperature-controlled parallel group controller is compared with an ordinary unit controller, the parallel group energy saving is also more than 10%.

Clear and intuitive display is also a feature of XBJ series parallel controllers, such as YA type pressure transmitter specially developed for refrigeration units, dual digital display controllers using large size digital tubes, clear and intuitive display, each press in the unit The working status and alarm status indicators can be visually displayed at a glance. At present, the refrigeration units used in the market are basically mechanical pressure switches. The pressure display is inaccurate, inconvenient, and single-function.

In general, XBJ series parallel controllers have the same advantages in terms of price and service as their counterparts in foreign countries. Compared with similar products in China, they have powerful functions and advantages.

Reporter: In addition to the two points mentioned above, what function does it have?

Zhang Zong: The first is the control function. It can control the compressor's equilibrium operation, and uses the measured return pressure value to control the number of on/off operations. The return air temperature value can also be used to control the number of on/off operations to measure the exhaust temperature of the compressor and control the condensation. The fan is on or off. The second is the protection function of the unit, including: high exhaust pressure protection, oil pressure protection of each unit, module protection, overload and phase protection.

Reporter: Through your introduction, we have relatively clear understanding of the XBJ series parallel controller. Thanks to Huangshi Xianda for launching such a good product for the refrigeration industry.