Now we talk about air conditioning pumps energy saving, we will think of pump frequency conversion technology. Indeed, the power consumption of central air conditioning usually accounts for about 65% of building electricity consumption. Central air conditioning design requirements to ensure that meet the local average maximum temperature, the building maximum heat load (fully open equipment, personnel meet) sufficient cooling capacity under the conditions, as the maximum load required power. Design time is generally based on the maximum load power needs to increase 10% margin as a safety factor, that is, the maximum load power of 110% as the design rate. Pump selection, the water flow than the host 15% to 20% larger. Therefore, the surplus pump power is very large, according to statistics, in the domestic central air conditioning system, the actual installed power is generally larger than the maximum load power even 15% -20%. One year, the temperature is usually only 20 days close to the annual average maximum temperature, the building is very little heat load conditions, according to the statistics or the actual incidence of a central air-conditioning to see the peak number of days to run below 7%, the rest of the time In partial load operation, it is not possible to peak all day due to changes in daily temperature even in peak operating days. Therefore, a normal central air-conditioning system has great energy-saving space, especially the water pump. Today, the air-conditioning pump power-saving mode has gone through the frequency conversion direct control, pressure-frequency control, temperature difference frequency control and so on the technical improvement, it should be said that the pump system frequency control technology has matured, the majority of users recognize and accept . In view of the current energy shortage in China, the awareness of energy conservation and requirements not only improve, especially in all walks of life gradually mature market, there is a general decline in profit margins, energy saving is of strategic significance to the country, the actual economic significance of enterprises, saving Down the cost is the net profit. Air conditioning pump energy saving is not the only frequency of doing this topic can be done? I do not think so. We have to combine the actual to study this issue, you can do the first pump frequency adjustment, the pump power frequency and frequency of power interests of the relationship clear. Let the pump in a reasonable range (power, time) and then play the role of frequency control technology to establish a reasonable cooperation. 1. Reasonable power, reasonable time, reasonable cooperation and reasonable power: We are now frozen, cooling water pump design power is generally greater than the actual use of power about 30%, a considerable period of time to be greater than about 50%. It is precisely because there are 30% -50% relatively unreasonable space, so energy-saving companies have mushroomed, numerous. How do we make the power allocation reasonable, this is a combination of universality and personality issues, not across the board. The general rule is that the design is greater than the actual use of about 30%, the pump group is mostly used or prepared for use, but we have to look at the pressure difference of the water system, to see the water, backwater temperature difference to make the appropriate combination of adjustments, so that two Adjust the average combination of power for a rung with a backup. For example: 45KW × 3 units = 135KW Adjust to 45KW, 30KW, 22KW (use 45KW as the peak value and reserve for fault) Commonly used 30KW, 22KW, change to the common (45KW + 45KW) = 90KW 42.22% power consumption. If the cold, warm shared pump, the savings even greater, because the heating pump power only about 40% of the pump power. In other words, the past winter with a 45KW, now only need a 22KW, saving 51.11% power consumption. For example: 45KW × 2 units = 90KW into 45KW, 30KW or 45KW, 22KW two kinds of combinations, this combination also has considerable space savings, both types of adjustments to meet both the maximum Load demand, but also can be based on the actual load for quantitative operation portfolio, which is what we seek reasonable power frequency power. Reasonable time: after the adjustment of the frequency pump, no matter what kind of combination has a certain number of power savings. Identified a reasonable frequency power, a reasonable time to adjust the frequency of a fixed basis. Integrated air-conditioning running load is high during the day, night low, the weather temperature is so these two features. Daytime trough time and nighttime trough time period, you can use the pump frequency conversion technology to further reduce the power frequency pump in the low section of the more energy-saving adjustments saved. The so-called reasonable time is such a time, this is very important. Rather than high-power, long time to go to the energy-saving companies to do frequency control, pay our engineers did not understand clearly through the tuition, so the user side is a loss, the technical service side to make full use of this power frequency is not adjusted to go Income, to promote the frequency of high energy-saving rate, in fact, there are some does not exist. Our engineering professionals are required to give full play to their expertise to study the elimination of relatively unreasonable wealthy workers exist for the pump frequency to do a good job preparatory work (to adjust the power frequency to determine the frequency conversion time). Reasonable cooperation: With a reasonable power, reasonable frequency adjustment time, then the basis for cooperation may be carried out within a reasonable range. To be paid by the service party to pay the energy-saving funds, service providers earn the amount due, otherwise, the need to be reasonable. For example: The hotel in the past two sets of refrigeration system pump combinations are: A: 45KW × 3 units for a preparation; B: 37KW × 3 units for a preparation, according to the normal use of power (4 months) Calculated: A: 45KW × 2 units = 90KW B: 37KW × 2 units = 74KW (2 months) Calculation: A: 45KW B: 37KW, this 6-month refrigeration period is calculated according to the shortest time. If we do this completely by the number of power to do frequency conversion, A: 45KW + B: 37KW + 45KW (cooling pump) = 127KW, set the frequency conversion into the unit price of 2,000 yuan / KW, calculated to be 254,000 yuan. If we use the adjusted power frequency to do frequency conversion transformation: A: 30KW + B: 22KW + 30KW (cooling pump) = 82KW, according to 2000 yuan / KW calculation required 164000 yuan. By adjusting the power frequency after the cost of capital into the power than the unadjusted power investment of 35.43% less capital, it is only buyout price. If it is to take part of the energy-saving eight or two, was the service of the greater loss. Service (ambiguous) profits to set up a large block. The reason is clear, we will account according to their own actual situation to accounting, how will save a few dozen percent of the cost, the key is that we must clarify the relationship between power frequency adjustment and frequency conversion energy saving, reasonable cooperation may be established. 2. We have to figure out the relationship between frequency adjustment and energy-saving inverter, we must recognize the above three reasonable, fully understand its implications. Be a good chief of staff for decision-making in investment decisions, earnestly do less with money and do good deeds. Frequency adjustment and energy-saving In the economy there is: How much to transform the capital? Technical aspects exist: is accurate, reasonable and effective. The concept is: the sense of responsibility to the enterprise, entrepreneurial spirit, the recognition of new technologies. We have clearly understood the importance of the three major relationships: responsibility, technology and economy. We have understood the three rationality of working frequency and frequency conversion with clear goals. So, we in the air-conditioning energy-saving work to learn, explore, research, improve the momentum is not the same. Re-talk about the energy-saving air-conditioning pump will start from the in-depth study to avoid the lack of knowledge of the frequency conversion technology does not have a one-time high investment funds or the latter part of the increase in the proportion of the economic loss caused by increased base. According to my air-conditioning pump power frequency transformation, adjustment and use of experience point of view. The focus is to identify the best operating load and power frequency junction, a clear understanding of the difference between frequency and frequency, frequency and frequency to match the good interactive power, to solve, find the joints, recognize the differences, matching A good interaction rate of these three major issues, then the frequency adjustment and energy-saving frequency conversion complement each other context is clear. I in 2003 the hotel air-conditioning refrigeration, cooling pump power frequency was done (42.22%, 45.27%), 42.22% down adjustment, the use of better, the annual total savings of electricity: 30.096 million, to change the pump input costs: 9 million yuan, then put into the year to recover. The above-mentioned pump frequency transformation project through two years of operation, monitoring observations, from the use of results to meet the supply we have done quantitative analysis and research. In view of the pump operating pressure, water, backwater temperature, the number of motor running current and several other major indicators combined with the end and the end of the temperature condition analysis concluded. I think in the existing A, B pump cascade combination can also be based on the next step of the frequency adjustment. A: 45KW, 30KW, 22KW A1: 30KW, 22KW, 11KW; B: 37KW, 22KW, 18.5KW; B1: 22KW, 18.5KW, 11KW. (This program has been through discussions with professionals to prove the feasibility of this program). And plans to make frequency conversion on the basis of this transformation, so that the cost of installation have different degrees of decline, the proportion of electricity to run down even greater (winter, seasonal clear). The contents described above is some specific work I do and personal experience, I think: to do air-conditioning refrigeration, cooling pump transformation of energy-saving, must first identify the relationship between pump frequency adjustment and energy-saving inverter.
