Figure: Large Air Conditioning System For Energy Saving - Energy Saving, Air-conditioning - Hc Net

Two-On Shopping Centre, Beijing Case Studies Overview Beijing is a double-On Shopping Centre

, shopping, entertainment, food for the integrated services building. Built in 1994, shopping malls building high five with a total construction area of 21000 square meters, in 1997 was named "the highest rate of Beijing's top ten customers to patronize shopping centers" one.

The shopping area of 18,000 square meters using air conditioning, air-conditioning system for a typical summer cooling and winter heating design. Market opening run, it was found in the transitional business district in winter season and the temperature high, not only do not need heating in winter, but sometimes cooling. The resulting water chiller running on a long time, so a waste of energy and easy to lead to the cracking coil air conditioning box and other equipment accidents. After double-On Shopping

air conditioning system on the test analysis, we found the main ventilation system is not appropriate, leading to the above problems. Therefore, the mall's ventilation system for the development of the reform program, implemented in the transformation project for one year after the completion of the operation process, the transition temperature in summer season and remained at 23 , winter without refrigeration, room temperature control around 20 , indoor air quality greatly improved. Annual chiller run time by almost half, air-conditioning units were significantly decreased in box to open, thus saving energy and achieved good economic results.

Purpose of case studies Through the technical, economic, energy saving and environmental protection, safety and shopping centers on the dual air conditioning system of energy-saving technological transformation projects, to sum up the experience and success of the project model to the majority of enterprises to promote the energy-saving technologies.

The total investment The new system was put into operation in September 1998, a total investment of 555,000 yuan.

Energy conservation 1998 1999 9 8 months and years, saving power 360,000 kwh, saving electricity 289,000 yuan (at current electricity .8 yuan / kwh basis), in 380 tons of carbon dioxide emission reductions.

In addition, the project implementation to improve the shopping environment, the less air conditioning box, refrigeration unit, reducing the maintenance cost of materials, labor and management fees.

Payback period Investment recovery period is 2.1 years

For objects Transition occurs at room temperature in winter season and high water chiller run time in a long, single-fan air-conditioning system stores and other buildings.

Case the source unit Double-On Shopping Centre, Beijing Monitoring unit Shanghai Energy Conservation Supervision Center

Energy Principle The operating parameters of the measured air-conditioned shopping malls and analysis: the original system design of air conditioning box fresh air, only to consider the summer cooling conditions, values are still reasonable. However, the transition season and winter, to a large number of fresh air to regulate the use of indoor temperature becomes 'stretched', unbearable to cope with.

This mall in two to five on the floor ceiling to install air vents, laminated as the static pressure box, in the south wall above the ceiling to install eight of axial fan, a total of 32 units. And using the computer to control the number of fans of the open platform, adjusting ventilation volume.

Figure 1 modified rear outlet and temperature sensor

Figure 2 shows the air-conditioning air balance chart, you can be specific crux of the problem and solution.

System Figure 2 Diagrams of wind

A1: fresh air, A2: return air, A3: Air Conditioning, A4: window exhaust, A5: Reform rear exhaust outlet

Transformation of the former wind balance relationship:

A3 = A1 + A2 = A2 + A4 Then A1 = A4 Known transformation from the above relation is equal before the volume of outdoor air leakage doors and windows, air leakage is limited because doors and windows, causing interior pressure is too high, a new wind is difficult to breathe, the transition period and winter, not a lot of wind to offset the use of new indoor heat load. Without cooling, the indoor temperature high, it had to open the cold water through the cooling unit to achieve the objective. This operation mode is very unreasonable, a waste of energy, but also may result in cold winter air box the cracking coil.

After the installation of ventilation system air flow balance relationship is:

A3 = A1 + A2 = A2 + A4 + A5

Then A1 = A4 + A5

After transformation, an increase of exhaust systems, fresh air suction chamber also increased. As the transition period and winter outdoor air enthalpy lower than the indoor air enthalpy, a large amount of cold fresh air would be sufficient to offset the room heat load, water chiller can be closed to avoid a lot of energy waste.

by: gaga

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