The cost of electricity for central air conditioners is measured on the basis of equipment parameters and the use of scene-by-scenes sub-scenes: first, the base formula method is extrapolated by the ratio of cooling to energy efficiency; second, the metering method is used to obtain real power consumption; third, the sub-graving method is calculated as a multi-trail system; fourth, the temperature setting is optimized by about 7 per cent for each 1 °c of electricity; and fifth, the periodic cleaning of filters and heat exchangers is increased by 20 per cent。
If you want to have an accurate picture of the electricity cost of the central air conditioner, but do not know how to quantify its actual electricity consumption, you need to calculate it on the basis of the equipment parameters and the use of the scene. The following are the specific pathways for computing electricity consumption and synchronizing energy consumption:
I. Base formula: derived from the ratio of refrigeration to energy efficiency
This method is applied to the conventional estimation of the parameters of known equipment labels, based on the mathematical relationship between the energy efficiency ratio of air conditioners (eer or cop) and the amount of refrigeration, which allows quick access to theoretical hourly power consumption。
1. Review of the central air conditioning room outer platoon to record the values “refrigeration (w)” and “refrigeration input power (w)”
2 if only the ratio of refrigeration to energy efficiency is known (e. G. Cop = 3. 4), the formula is used: input power = refrigeration ÷ cop, resulting in watt (w)
3 the input power is divided by 1,000 to kw, i. E. The amount of electricity consumed per hour (kwh) at full capacity
4 combined with the actual daily operating hours and load rate (e. G., an average load rate of 45 per cent), the proxy formula: daily electricity consumption = kw x hours x load rate。
Ii. Electronic methodology: acquisition of real value by measuring equipment
The method circumvents the theoretical parameters and actual performance deviations and directly reflects dynamic electrical behaviour, such as compressor start-up, frequency reconciliation, changes in the number of multi-line stations, etc., with the most reference value for data。
1. Discontinuation of other large power appliances to ensure that air conditioning is the only main charge
2. Record the current indicative number of household meters before the start of air conditioning (two decimal places)
3. Allow cac to run a typical whole period of work (e. G., two hours of steady operation under refrigeration)
4. Rereading the electricity expression, the difference between which is the actual amount of electricity consumed during that time (kwh)
This value is divided by the number of operating hours to produce the average hourly electricity consumption under the condition。
Iii. Sub-cumulative approach: one-stop system-by-one accounting
For the independent operation of multiple indoor machines and the irregular number of opening stations, the total power consumption is calculated by superseding the output power of the external aircraft through the cooling requirements of the respective interior mechanisms。
1. Confirmation of a rated level of cooling per aircraft (commonly 2. 6kw, 3. 5kw, 5. 1kw, etc.)
Estimated actual cooling requirements for each room based on room size and usage (bedroom at 130 w/m2 and living room at 160 w/m2)
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3. Combining the actual required cooling of each of the operating indoor machines with the current total cold load
4. Check the iplv curve or variable frequency reconciliation of this type of outdoor aircraft to find input power corresponding to the total cold load
The input power shall be converted to electricity consumption over the actual time of operation。
Temperature setting optimization: approximately 7 per cent of cooling power at 1 °c
Human sensitivity to temperature is delayed, and small adjustments set can significantly reduce the probability of continued high load operation of compressors, especially during high-temperature periods after summer。
To adjust the cooling temperature from 24 °c to 26 °c and to maintain the establishment for at least two hours
2. Combining cycle fan use to promote even distribution of cooling gases and to avoid local overcooling leading to miscalculation of thermostats
3. The sleep mode is activated during the night sleep phase so that the temperature is automatically increased by 1-2°c within 3 hours
4. The reverse operation during heat preparation will also achieve energy efficiency by lowering the set temperature from 24°c to 22°c。
V. Cleaning of filters and heaters: an increase of 20 per cent in power consumption of dust above 2 mm
Dust-covered filters and evaporating wings can seriously hamper air flow and thermal exchange efficiency and force compressors to extend their running time to achieve target temperature。
1. Turn off the ac power supply and remove each indoor machine back to the wind filter
2. Sweep the surface of the surface with soft brushes and impregnate for 10 minutes with neutral detergent aqueous solutions
3. Cleaning and washing are thoroughly dryed in the shade (sun or baked strictly)
4. At least one high-pressure air gun blow-out per year of outdoor condensers ' wings, focusing on the removal of the twilight, insect corpses, oil stains, etc。
