Correctly distinguish between two-in-one supply and three-in-one supply for central air conditioning

Correctly distinguish between two-in-one supply and three-in-one supply for central air conditioning

To put it simply, the so-called "dual supply" is to use an air energy heat pump system to provide two combined functions of "hot water + heating" or "heating + refrigeration"; "triple supply" is to provide "air conditioning + floor heating + Three combined functions of "hot water".

What needs to be clear is that both "two-generation" and "three-generation" are for water system air conditioners, and fluorine system air conditioners do not have these concepts.

Water system air conditioner consists of two parts: indoor unit and outdoor unit. The outdoor unit is generally called a cold and hot water unit, and the indoor unit is generally called a fan coil unit. The outdoor unit and the indoor unit are connected through a water supply pipe. The outdoor host provides air conditioning cold/hot water, which is delivered to the room by the water supply pipe system, and the water and air exchange heat at the end of the room to adjust the temperature to meet the different needs of people.

In summer, the outdoor main unit of the “two-generation" central air conditioner produces chilled water, which is exchanged in the fan coil through the circulation system to blow out the cold air; in winter, the outdoor main unit produces hot water, which circulates through the dedicated heating pipeline. Heating the ground decoration layer, heat the ground through ground radiation and convection heat transfer.

　　 "Triple-supply" has one more function than dual-supply, that is, it can heat domestic water through the heat generated by the operation of the host, while meeting the three needs of air conditioning, floor heating and domestic hot water.

　　What are the "two-in-one supply" and "three-in-one supply" of central air conditioning?

Compared with traditional air conditioners, “two-in-one" and “three-in-one" central air conditioners are more convenient to install, more practical, and more energy-efficient. At the same time, they can greatly save indoor space; "And "triple supply" are more comfortable to use and more environmentally friendly.

In addition, the central air conditioner of the water system uses water as the refrigerant, and the temperature difference during heat exchange is only about 5 degrees. The cold air blown out during summer cooling is more uniform and soft, and the temperature rise during winter heating is more stable. The comfort level is much higher than that of traditional equipment.

　　The advantages and disadvantages of dual-supply and triple-supply central air conditioning

The advantages of dual supply: In the past, whether it is for cooling or heating, the family needs to install several outdoor units on the outer wall. The dual supply of air energy solves this big problem. It only needs one host to realize the cooling and heating of the whole house. . Air energy dual supply basically uses DC frequency conversion technology, which saves a lot of energy in terms of electricity consumption.

Disadvantages of dual supply: easily affected by the external environment, air source heat pumps mainly transfer heat in the air to achieve heating and cooling effects. When the outdoor temperature is low, the evaporator may be frosted, which affects the efficiency of the evaporator .

Advantages of triple supply: only one host is needed. The triple supply of air energy can be used for cooling and heating, and can provide domestic hot water. In the cooling + hot water operation mode, all condensation heat can be recovered and utilized, and the overall energy efficiency ratio is high. The initial investment and operating costs are more than 10% less than the traditional air conditioner + water heater. When the cooling mode is turned on in summer, all the heat originally discharged into the environment is recovered through the total heat recovery technology, which is used to heat domestic hot water to achieve the purpose of energy saving.

Disadvantages of triple power supply: Due to the different water quality in different regions, new water flows into the bathing hot water heat exchanger every day, which requires high corrosion resistance of the heat exchanger. Many triple power units are caused by corrosion penetration of the bathing hot water heat exchanger. Water enters the fluorine circuit system, causing the entire air conditioning unit to be scrapped. If you want to eliminate the problem of corrosion as much as possible, use the hot water in the bath as a secondary heat exchange system, and the condensing temperature will inevitably increase by about 5 ℃, which will aggravate the reduction of COP value, and the gain will not be worth the loss. In addition, the triple-supply products are far inferior to the dual-supply in terms of the use effect and the stability of the later system.