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3.7. Solution Pump Improvement

3.8. Refrigerant Flow Control Improvement Pulsing TXV

3.9. Installed View at Vicot

3.10. Installed Chiller and Chiller Link
 Part-Load Operation with Improved Efficiency

3.11. Other Absorption Products. All with Potential Dual Solar Capability

4. High efficiency medium temperature solar collector

4.1 Summary

By independent innovation, VICOT has successful developed trough solar collector and has intellectual property of it’s critical technology, to ensure the high efficiency and affordable cost of the collector, VICOT uses precision lathe and molding equipment and common materials. The experiments prove that the efficiency of the collector is in the advance level of the industry, it can fully realize the localization and large-scale production, fundamentally changed the situation in the medium-high temperature solar industry.

4.2. Installation at Vicot

The solar collector adopts medium-high temperature trough collecting system, which consists of reflecting mirror, vacuum tube, rack and tracking system, it is able to track the sun on the different radiation point in order to collect heat, the efficiency can be achieved up to 58% when the radiation degrees is 800w/m2. Currently, it is one of the highest efficiency solar collector systems.

4.3. Trough solar collector

vacuum tube arc shaped panel reflecting mirror

4.4. Testing of solar collector

Below is one set of solar collector system that installed at Vicot. The axes of the solar collector is east-west positioned. The system contains four solar collector modules.

5. Ice/heat storage

According to the different regions and requirements of customers, Vicot can also provide storage in two different ways: high temperature thermal storage and low temperature ice storage. Thermal storage device can store the energy generated by solar collector, it provides stable 200 Degrees Celsius hot source through the PLC control, this technology is joint R&D between Vicot and a famous university in China. Ice storage is to store the excess cooling that produce by solar air conditioning. Once there is a need for air conditioning in the room, the cooling will be released.

6. Controls Control System Includes:

7、Economic analysis

7.1. Economic analysis (using payback method). Illustrates the calculation of payback period.

For instance, in the middle east, the required cooling area is 180 m2. As calculation of solar air conditioning: the system use 5 tons chiller (18KW), COP = 0.8, collector efficiency is 58%, installed collector area efficiency of the average irradiance in the installation area is 0.8 KW/m2, sunshine hours is 3300, so: A. Required input power: 18÷0.8=22.5KW B. Required solar collector area: 22.5÷( 0.8 × 0.58)=48.549m2 So the cooling capacity throughout the year is: 3300×18=59400KW The cost for solar air conditioning: 49×¥2000+¥50,000=¥148,000 Note: the cost for solar collector is ¥2000/ m2; the cost for chiller is ¥50,000/unit So the operation of solar air conditioning is: 3300×0.5=1650×1= ¥ 1650 Note: during the operation of solar collector, there is a small amount of power loss that is 0.5KW/h. In the non-sunshine hours, gas can be used as supplement for solar air conditioning or choose optional energy storage device.

7.2. The same region and the cooling area, then calculation on the traditional air conditioning:

Use Dakin VRV as an example, it match 18 KW electric air conditioning, assuming it cost 400 RMB per square meter, so the cost for the electric air conditioning is: 180 m2 ×¥400/ m2 =¥72,000 Cooling capacity of annual sunshine time for electric air conditioning is: 18×3300=59400 KW The operation cost for electric air conditioning per year is:59400÷2.5=23760KW×1 =¥23,760 Note: energy efficiency ratio is 2.5; electricity cost is ¥1kW/h

7.3. Payback period

Annually, the cost savings of solar air conditioning compare with the traditional electric air conditioning is: 2.3760-0.1650= ¥ 22,110 The additional cost of investment recovery period of solar air conditioning compare with the traditional electric air conditioning is: 14.8-7.2= ¥ 76,000 7.6÷2.211=3.44 years The total payback period of solar air conditioning is: 14.8÷2.211=6.7 years

7.4. Summary

From this it can draw that to recover the additional cost for solar air conditioning it only takes 3.44 years compare to traditional electric air conditioning, and it takes 6.7 years to recover the total investment cost. Also, the lifetime for solar air conditioning is more than 15 years, so it can create more economic valve for customers: (15-6.7)×2.211=184,000 Note: This calculation does not include government subsidies; it not calculate the social value of peak period and use of natural refrigerant, solar air conditioning can also provide hot water, which is not included.

8. Conclusion

Vicot and Rocky joint development of thermal driven solar air conditioning system fundamentally solves two problems. (1) Efficiency: VICOT collector coefficient up to 0.58, by using trough solar collector system with intellectual property rights.. (2) Minimization and manufacturing cost control: Applied GARX heat exchange and high efficient heat exchange tube technology for the thermal driven solar air conditioning, the performance coefficient is reach to 0.8 Vicot thermal driven solar air conditioning system has a number of intellectual property rights, It has made significant reduction in the cost of solar air conditioning, and really brings solar air conditioning into a practical stage with the competitive cost advantages and technological advantages comparing with the traditional air conditioning. It also has significant economic and social benefits, it completely changed the situation for energy of air conditioning, and has opened up a new space for development of air conditioning industry, and in line with national environmental policies and energy saving requirements.

Thermally Activated Absorption High Efficiency Generator-Absorber Heat Recovery The Future of Air Cooled HVAC