Not long ago, the Ministry of finance, the national development and Reform Commission issued adjustment after the 14 energy-saving products in government procurement list (hereinafter referred to as the "energy-saving list"), in terms of the air conditioning, the 14 energy-saving list of fixed speed air-conditioning in the list of energy-saving has shrunk significantly, instead is the inverter air conditioner. In the national energy saving products, such as the promotion of policies, frequency conversion air conditioner market promotion, rapid development into the mainstream of the market, inverter air conditioner is expected to become the main force of the government procurement market.
In the government procurement field of air conditioning, ultra-thin, frequency, speed, energy saving, digital vocabulary has become a new trend of the times. Inverter air conditioner performance in the government procurement market is active, especially the frequency of multi central air conditioning is more frequent in the procurement. At the same time, the purchase of more than the central air conditioner inverter air conditioner has become a hot spot in the government procurement market, and will gradually replace the split machine, and gradually become the new trend of government procurement of air conditioning market. The so-called multi connected air-conditioning is to focus on the split air conditioner to an outdoor machine, such as a drag five have 5 compressors, but the cold media system independently of each other. Multi line is mostly used in frequency conversion technology, according to the changes in the indoor load, adjust the speed of the outdoor compressor change, and in order to adjust the refrigerant mass flow output, so as to effectively reduce energy consumption.
So what are the advantages of using multi frequency inverter central air conditioner, the author believes that the advantages of multi central air conditioning system is mainly reflected in the following aspects:
First, energy saving. At present uses connection type variable frequency central air-conditioning is by DC variable speed compressor, according to actual indoor need to cooling and heating, each room can be controlled separately, indoor use and outdoor unit provides many cooling capacity, load may be compared with the general machine more energy saving. Two is the overall decoration effect is good. Central air-conditioning is only a machine, not like the traditional air-conditioning failure overall appearance, and central air-conditioning indoor unit installation "Tibetan beauty", by simple local ceiling can achieve stealth installation. Three is higher comfort. Split machine feeding angle is limited, but there is no fresh air system, so the air conditioning for a long time will feel very turbid indoor air. The central air conditioner indoor unit has a variety of air supply mode, so that the airflow distribution is more uniform, at the same time the central air conditioning can be introduced into the outdoor fresh air that is the introduction of fresh air, make people feel more comfortable. Four is low noise. The compressor is used in the central air conditioner outdoor unit to make the rotor and the blade into a whole, to solve the friction between the rotor and the formation of the noise, running up to only about 50 db. In the indoor machine, used in residential use more Tibetan wind pipe machine, the minimum can be accomplish 25 dB, and hidden in the ceiling, the noise value can be reduced to a minimum.
Procurement of multi inverter central air conditioning procurement needs to pay attention to what the problem? The author believes that there are mainly the following aspects:
First, the purchaser shall do the preparatory work before submitting the government procurement requirements. First of all, the buyer should contact the design unit for the whole air conditioning system design, preliminary determination of the air-conditioning system plan, the plan, the system diagram, etc..
Second design institute is generally designed according to a certain brand, the purchaser in the proposed multi connection type variable frequency central air-conditioning procurement requirements can not directly copy the design specification and design drawings of the device from the list of data and main technical parameters of the cooling capacity and heating capacity and technical parameters such as fill time should be in a range of values, only cooling capacity and heating capacity of reference value, not a specific data, with "greater than or equal to" or "positive and negative deviation within a certain range of" the wording.
Three is the number of accurate statistics on the major air conditioning equipment, such as air conditioning equipment in the outdoor unit and indoor unit and outdoor air machine, fill in the procurement schedule and other installed auxiliary and the auxiliary can statistics do not, only provide a reference to design drawings. In the procurement of technical requirements, the purchaser can put forward the cooling capacity of air conditioners and heating requirements, refrigerant requirements, the wind form requirements, etc.. Other indicators such as noise, the size of the machine requirements, the thickness of the indoor machine requirements, COP energy efficiency ratio, power consumption, power supply (380V/220V), electric power and other procurement requirements can also be proposed, but can not be discriminatory.
Four is to pay attention to the installation requirements. Compared with the split air-conditioning, central air-conditioning can be described as perfect, but as a system engineering, central air conditioning has been "third production, seven installation" argument, so installation quality is to buy central air conditioning, if not pay attention to the installation requirements may lead to endless trouble. If the installation of central air conditioning problems, the common problem is that there will be a drop of water outlet, which is mainly due to the indoor air drainage is not smooth or the outlet condensate caused by. To debug the system should be in after the installation of air conditioning, only the normal debugging, smooth drainage system, welding no problem, can avoid leakage phenomenon. Therefore, the purchaser shall request the supplier bids installation qualification.