Reasonable cooperation: With reasonable power and reasonable frequency conversion adjustment time, the cooperation basis may be carried out within a reasonable range. The serviced party pays the energy-saving funds that should be paid, and the service party earns the due amount, otherwise, the rationality needs to be confirmed. For example: the water pump combinations of the past two sets of refrigeration systems in this hotel are: A: 45KW × 3 sets for dual use and one backup; B: 37KW × 3 sets for dual use and one backup, calculated according to the usual power (4 months): A: 45KW×2 sets=90KW B: 37KW×2 sets=74KW (2 months) Calculation: A: 45KW B: 37KW, the 6-month refrigeration period is calculated according to the shortest time. If we do frequency conversion according to this power number, A: 45KW+B: 37KW+45KW (cooling pump)=127KW, if the unit price of frequency conversion is 2000 yuan/KW, the calculation will cost 254,000 yuan. If we use the adjusted power frequency power for frequency conversion transformation:
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A: 30KW+B: 22KW+30KW (cooling pump) = 82KW, it will cost 164,000 yuan based on 2,000 yuan/KW. After adjusting the power frequency power, the cost of investment is 35.43% less than that of the unadjusted power frequency power, which is just the buyout price. If the power-saving part is divided into eight or two, the loss of the serviced party will be even greater. A large chunk of the (ambiguous) profit of the service side is established. The reason is clear, everyone will calculate the account according to their own actual situation, and it will save tens of percent of the cost. The key is to understand the relationship between power frequency adjustment and frequency conversion energy saving, and reasonable cooperation may be established.
If we want to understand the relationship between power frequency adjustment and frequency conversion energy saving, we must recognize the three reasons mentioned above, and fully understand their contents. Be a good advisor to leading investment decisions, and do the right thing and do good things with less money. Power frequency adjustment and frequency conversion energy saving exist in the economic aspect: how much is the investment in the transformation? The technical aspect exists: whether it is accurate, reasonable and effective. The concept is: responsibility for the enterprise, enterprising spirit, and awareness of new technologies.
I have clearly understood the importance of the three major relationships of responsibility, technology, and economy, and understood the three rationalities of power frequency and frequency conversion, and the goal is clear. Then, our enthusiasm for studying, exploring, researching and improving in air-conditioning energy saving work is different. When it comes to energy saving of air-conditioning water pumps, we will start from in-depth research to avoid economic losses caused by high one-time investment or increased base of share ratio in the later stage. According to my experience in power frequency transformation, adjustment and use of air-conditioning water pumps. The key point is to find the best joint point between operating load and power frequency power, recognize the difference between power frequency and variable frequency, match the interactive power between power frequency and variable frequency, solve and identify the joint point, recognize the difference, and match If these three issues of good interaction rate are satisfied, then the context of the complementary relationship between power frequency adjustment and frequency conversion energy saving will be clear. In 2003, I adjusted the power frequency power of the hotel's air-conditioning refrigeration and cooling water pumps by (42.22%, 45.27%) and 42.22% respectively, and the use effect was good. More than 90,000 yuan was invested in that year and recovered in the same year.
After two years of operation, monitoring and observation, we have done quantitative analysis and research on the centrifugal pump power frequency transformation project from the aspects of use effect and supply. According to several main indicators such as pump operating pressure difference, outlet water, return water temperature difference, and motor operating current, and combined with the analysis of the temperature conditions at each end and high end, the conclusion is drawn. I think the power frequency adjustment of the next step can be done on the basis of the existing cascade combination of A and B pump groups. A: 45KW, 30KW, 22KW A1: 30KW, 22KW, 11KW; B: 37KW, 22KW, 18.5KW; B1: 22KW, 18.5KW, 11KW. (This program has been communicated and discussed with professionals to prove the feasibility of this program).
Moreover, it is planned to carry out frequency conversion transformation on this basis, so that the installation cost will be reduced to varying degrees, and the proportion of operating electricity cost will be even greater (obvious in winter and seasonal changes).
