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[[SUNNY] article tells you how air-cooled chillers differ from PF-based air conditioners!]
Release date：[2018/3/22]
Is reading[1284]次
Air-cooled chillers are a type of central air-conditioning system, while PF-based multi-air conditioning systems are a form of split-air conditioning.
The cold water outlet temperature of the air-cooled chiller is between 7 and 12°C. After being processed by an end system such as a fan coil or a combined air conditioner, the temperature of the cold air entering the room is between 15 and 18°C. Central air-conditioning comfort;
The evaporating temperature of PF-C multi-size air-conditioning system is between -1 and 3°C. Without any treatment process, the evaporator is placed in the room and the fan directly blows the cold air at 7 to 10°C indoors. If the person directly If you work or do other activities within the air supply area of the air outlet, if you stay in this environment for a long time, you can easily catch a cold or other air-conditioning disease.
The air-cooled chiller terminal system's air inlet and outlet are separated. In the design process, the air-cooled chiller's end system delivery and return air outlet positions can be adjusted to achieve a uniform air supply effect in rooms of different shapes. The air flow organization is rationalized so that there is no dead air in the room;
The delivery and return air inlets of the PF-C multi-size air-conditioning system are basically integrated, and it is difficult to adapt to the changes in the shape of different rooms. This integrated delivery and return air outlet is only applicable to square or round rooms, and other shapes There was a dead corner in the room, causing the temperature in the room to be uneven.
The initial investment of the air-cooled chiller system is low, maintenance and maintenance are convenient, and the cost is low. The equipment and installation costs of the air-cooled chiller system are relatively cheap, and the air supply and return pipes of the air-cooled chiller system all belong to the Low-pressure fluid transportation pipeline, the pipeline material is ordinary hot-dip galvanized steel pipe, the valve is an ordinary welded flange valve or threaded valve, it is easy to buy in the market, and the price is cheap, maintenance operations are relatively simple;
The initial investment of the CFC-based multi-size air-conditioning system is high, and the equipment cost and installation cost are much higher than the air-cooled chiller system of the Wande. The fluorinated pipelines of the CFC-based multi-size air conditioning system are high-pressure pipelines. The material of the pipe is copper pipe, and the valve is made of brass. The purchase must go to a professional refrigeration accessories store. The price is also high. The repair work needs professional refrigeration brazing personnel, the degree of difficulty is also high, and the entire indoor system needs to be maintained during maintenance. The Freon was discharged, and after the maintenance was completed, a large number of new Freons were refilled, further increasing the cost of maintenance.
The indoor system of the air-cooled chiller system can be connected to a municipal heat source system or a boiler system. In the winter, heating is performed. The indoor system of the air-cooled chiller system is used for heating. The indoor air is not dry and the hot air is even and stable. The influence of conditions, and the air-cooled chiller system can start the heat pump function during the season before and after the heating period to heat the room;
The CFC-based multi-size air-conditioning system can only heat the room during the season before and after the heating period. During the heating period, if the outdoor temperature is lower than -5°C, the heat pump efficiency drops sharply, that is, the outdoor temperature is lower, and the unit's The smaller heating capacity, this can not meet the stability of the winter heating, so the CFC-based multi-small air-conditioning system in the winter also requires the traditional heating system to heat the room, which increases the cost of investment, but also occupied Effective indoor use area.
Air flow in the indoor system of the air-cooled chiller system is water, and the system is a low-pressure system (1 to 5 kg/cm2), which is not prone to leakage. Even in the event of a leak, the water is not harmful to the human body (wind The chiller systems of the cold chiller system are all placed in outdoor air-cooled chillers);
All the systems in the indoor system of the PF-TOC system are Freon, and the system is a high-pressure system (4-22kg/cm2). It is prone to leakage. Once a leak occurs, Freon will produce toxic gas in the event of an open flame. Phosgene, causing life-threatening hazards to the human body.
The air-cooled chiller system can be used in buildings with large areas and high buildings. According to the length of the indoor system pipeline, the size of the pipe diameter and the number of indoor equipment to calculate the size of the pipeline resistance, select the appropriate pump head, flow rate Can guarantee the flow of cold water in each pipeline, the installation of air-cooled chiller system is not affected by the length of the pipeline, the size of the area, the construction of high factors;
The maximum length of the copper piping system of PF-TOC air-conditioning system is only 35 to 40m long. Otherwise, the Freon system will not be able to circulate properly and the equipment will not operate normally. Even if the copper piping system is within 40m in length, it will work. Efficiency also decreases with length.
The condensing water pipe of the indoor system of the air-cooled chiller system discharges condensate through a slope of 0.3% to 0.6%, and is discharged by relying on the gravity flow of water. The principle is simple and the failure rate is low.
The condensate in the indoor system of the PF-TOC system is discharged through the suction of a micro-pump. This micro-pump is hidden inside the indoor unit and has a high failure rate. Once a malfunction occurs, condensate urine condensation occurs. , affecting the appearance of the decoration, and maintenance is very difficult.
The air-cooled chiller system can adjust the size of the water flow through each fan coil according to the size of the indoor fan coil, through the pipe diameter and the valve, to ensure the same temperature in each room;
Although the indoor units of the CFC-based multi-drop air conditioning system are of large or small size, the flow of the fluorocarbon system equalizer to each indoor unit is approximately the same, which results in a small indoor unit evaporation temperature. Low, the supply air temperature is also low, large indoor unit evaporation temperature is high, and its supply air temperature is also high, it formed a small room cold, large rooms of hot and cold heat inequality phenomenon.
The air-cooled chiller is composed of multiple modules. When one module fails to perform maintenance, the other modules will normally operate as usual for cooling or heating without affecting the overall central air-conditioning effect.
In the event of a failure of the PF-C multi-size air-conditioning system, all of the equipment must be shut down for maintenance and the air-conditioning system cannot be used temporarily.
The air-cooled chiller system can automatically adjust the number of input operation modules according to the change of indoor cooling and heating load to achieve energy saving.
All-fluorine-to-air and small-sized air-conditioning systems are always put into operation and cannot achieve energy-saving goals.
Air-cooled chiller system centralized control, computer duty, to achieve no management, greatly saving manpower and material resources;
Fluorine-depleted multiple small-scale air-conditioning systems are decentralized with large investment and manpower, resulting in a waste of manpower and material resources.
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