Professional acquisition of second-hand central air conditioning, lithium bromide central air conditioning system structure and working principle

Shanghai New Material Recycling Co., Ltd. 021-6381-2185 Provides second-hand equipment acquisition service; recycles used air conditioning equipment from secondary used central air-conditioning, second-hand lithium bromide recovery, second-hand Kaili, recovery of Shanghai cold, recycling Sanyo, recycling large, regular energy and other brands of central air-conditioning equipment Recycling, lithium bromide refrigeration unit of 100,000 Kcal 3 million kilocalorie, piston chiller, recycled second-hand transformer, Shanghai elevator recovery, recovery boiler, recovery generator set, welcome to inquire or negotiate recycling, telephone number; 139-169 -13086 Contact Mr. Wang Classification of Refrigeration System Air-conditioning refrigeration technology belongs to the common refrigeration range, mainly using liquid gasification refrigeration method. (It is mainly to use the liquid gasification process to absorb the latent heat, and the liquid pressure is different, the boiling point is also different, the lower the pressure, the lower the boiling point.) According to different ways of transferring heat from a high temperature object to a low temperature object, it can be divided into: vapor Compression refrigeration, absorption refrigeration.
Edit this paragraph vapor compression refrigeration refrigeration principle The gaseous refrigerant (such as Freon) is compressed into high-temperature and high-pressure gas by the compressor and then enters the condenser. It exchanges pressure with water (air) and converts it into low-temperature and high-pressure liquid. The liquid working substance removes moisture and impurities through the dry filter, enters the expansion valve to reduce the pressure, and becomes a low-temperature and low-pressure liquid working substance, and is vaporized in the evaporator. The liquid gasification process must absorb latent heat of vaporization, and the liquid pressure is different. The saturation temperature (boiling point) is also different. The lower the pressure, the lower the saturation temperature. For example, 1 kg of water, at a pressure of 0.00087 MPa, a saturation temperature of 5 °C, needs to absorb 2488.7 KJ of heat during gasification; 1 kg of ammonia, at a standard atmospheric pressure (0.10133 MPa), needs to absorb 1369.59 KJ at gasification Heat, temperature can reach -33.33 °C. Therefore, as long as certain low-pressure conditions are created, the desired low temperature can be obtained by using the gasification of the liquid. Based on this principle, the gasification process draws in the heat of the chilled water, so that the temperature of the chilled water is reduced (generally reduced to 7°C). The refrigerant absorbs heat in the evaporator, and the temperature rises to become superheated steam and enters the compressor to repeat the cycle. Vapor compression refrigeration systems are mainly divided into water-cooled and air-cooled systems, as shown in Figure 2-1 and Figure-2.
compressor

Refrigeration compressor is an important equipment for vapor compression refrigeration equipment. Refrigerator compressors come in many forms. According to different operating principles, they can be divided into two major categories: volumetric refrigeration compressors and centrifugal refrigeration compressors. The commonly used compressors currently include piston compressors, scroll-type, screw-type, and centrifugal compressors, as shown in Figure 2-3. Volumetric refrigeration compressors rely on changing the volume of the working chamber to compress the periodically inhaled quantitative gas. Commonly used positive displacement refrigeration compressors include reciprocating piston type refrigeration compressors and rotary type refrigeration compressors. Centrifugal refrigeration compressors rely on centrifugal force to continuously compress the sucked gas. The compressor has a high number of revolutions and a large cooling capacity. At present, the cooling capacity of a single unit of Freon centrifugal refrigeration compressors for air conditioning in foreign countries is as high as 30000kw

Air conditioning horsepower refers to the input power, including the press, fan motor and electronic control part. Because of different brands and their specific system and electronic control design differences, the output of the cooling capacity is different, so the cooling capacity is calculated as the output power. In general, the cooling capacity of one horse is roughly 2,000 calories converted into international units multiplied by 1.162, so the cooling capacity of one horse is 2000×1.162=2324W. Here W (Watts) means that the cooling capacity is 1.5 horsepower should be 2000 × 1.5 × 1.162 = 3486W, and so on, you can roughly determine the number of air conditioning and cooling capacity. Under normal circumstances, the cooling capacity of 2200-2600W is called a horse, 3200-3600W is 1.5 horses, 4500-5500W is 2 horses.

The number of air-conditioning horses represents the size of the cooling capacity of the air-conditioning, that is, the cooling capacity. An air-conditioning cooling capacity is about 2500W, which is suitable for a room of about 12 square meters. The two air-conditioning cooling capacity is about 5000W, which is suitable for a room of about 25 square meters.

Generally, households can calculate the cooling capacity of the air conditioner according to the size of the room and the sealed insulation conditions, floor, orientation, height and other factors, with the cooling capacity of 150-220 W per square meter. Simply use air conditioners for cooling in summer, and the cooling capacity can be appropriately small. If air conditioning heating is needed in winter, the cooling capacity should be appropriately larger. The poor sealing and heat preservation conditions of the room should allow the cooling capacity to be larger, and the sealing and heat preservation conditions should be good. The cooling capacity can be smaller.

Edit this paragraph details Air conditioning size regardless of "patch"

The standard stipulates that the size of the room air conditioner is marked according to the cooling capacity parameter. For example, an air conditioner model KFR-22GW, in which the number "22" indicates that this air conditioner has an air conditioner with a cooling capacity of 2200W, may be abbreviated as "22 type" ". But now many people do not call it, but how many "patch" is called. Actually calling "patch" is totally wrong. "Patch" is a power unit, 1 (horsepower) = 735W (watts), in the past in Japan, the verbal name of the input power is 735w air conditioner called 1 air conditioner, the input power of 1470W air conditioner is called 2 air conditioners. ....., but because the air conditioning input power is not necessarily exactly the whole horse, such as 1400W or 1600W are said to be small 2 and large 2; between 1 and 2 is called 1.5, and so on.

From this it can be seen that this name is actually very unscientific. First, the data reflected is not accurate, but only an approximate value. Second, the input power does not accurately reflect the actual cooling capacity of the air conditioner. Since the quality of air conditioners is different, the energy efficiency ratio is also different (Energy efficiency ratio is a parameter that reflects the cooling efficiency of air conditioners, that is, the ratio of the actual cooling capacity to the input power. For example, if an air conditioner with a cooling capacity of 3000 W has an input power of 1000 W, then the energy efficiency ratio It is 3) that, when the input power is the same, the cooling capacity is not the same. For example, for an air conditioner with an energy efficiency ratio of 2.6 and an input power of 1000W, the cooling capacity is 2600W, while the other energy efficiency ratio is 3.5. The same power as 1000W air conditioning, the cooling capacity is 3500W. Visible cooling capacity is very different, according to "patch" is completely meaningless.

Air conditioning and cooling capacity

Air-conditioning cooling capacity is an important parameter reflecting the cooling capacity of air conditioners. It is the basic basis for selecting air conditioners. Household air conditioners are generally selected based on 120-150 W cooling capacity per square meter. Generally do not need to exceed 200W/square meter. Such as a 20 square meter bedroom, no West drying, sealing and heat insulation, choose 26 type (cooling capacity of 2600W) can be; if the sealing heat insulation is slightly poor optional 30 type; if the West sun and seal insulation is not good, optional 32, Type 35 and so on. If you press the input power "p" you do not know how to choose.

It can be seen that the so-called "patch" can not accurately reflect the cooling capacity of air conditioners, and only the cooling capacity parameters marked on the air conditioner models are accurate and scientific.

Room area and air conditioning model selection

Under normal circumstances, the cooling capacity required for a typical home bedroom is 115-145 W per square meter, and the required cooling capacity for a living room and dining room is 145-175 W per square meter. The room is well insulated, sealed, and not worthy of the sun. On the other hand, if the room is high, the floor height should be increased. The median condition is generally desirable, such as 130 in the bedroom and 160 in the living room. Such as: bedroom

15 square meters: 130 * 15 = 1950 (W), because there is no corresponding cooling capacity of air conditioning, the nearest type 22;

20 square meters: 130*20=2600(W), choose 26 type;

25 square meters: 130*25=3250(W), type 32;

28 square meters: 130*28=3640(W), choose type 35.

living room:

30 square meters: 160*30=4800(W), choose 50 type;

40 square meters: 160*40=6400(W), choose type 60;

45 square meters: 160*45=7200(W), choose type 72;

In addition, the need to consider the room power supply, the general 50-type air-conditioning has the difference between two-phase power supply and three-phase power supply, if there is a three-phase power should try to choose three-phase air conditioning, each phase current is smaller, is conducive to electricity Safety.