Concept Introduction

Multi split split pipe, also known as air conditioning splitter or branch pipe, split pipe, etc., is a connecting pipe used in VRF multi split air conditioning systems to connect the main unit and multiple end devices (evaporators). It is divided into air pipe and liquid pipe. Tracheal tubes generally have a thicker diameter than liquid tubes. The refrigerant passes through an expansion valve or capillary tube throttling, and then exits the main engine and connects to the liquid pipe of the branch.refrigerantThrough liquid pipe diversion, other branch pipes and end evaporators can be separated. The refrigerant absorbs heat in the evaporator and becomes gas, which then flows back to the compressor of the main unit through the air pipe.

The air conditioning branch pipe is equivalent to the branching head of the water pipe, used to divert refrigerant. The multi connected branch pipe is used as an accessory to connect several air vents. The selection of branch pipes is determined based on the capacity of the indoor units connected to each branch pipe.

The air conditioning branch pipe can be installed horizontally or vertically, and the angle between the branch pipe mouth and the horizontal line must be less than 15 degrees when installed horizontally; When installed vertically, facing the two branch pipe openings, the angle between any branch pipe opening and the vertical line must be less than 15 degrees; The pipeline after the two openings must ensure a straight section of at least 60 centimeters; Small disagreements cannot replace large disagreements.

The inlet and outlet of the branch pipe are both composed of multi section copper pipes with variable diameters, which increases the flexibility of selection.

characteristic

Compared with traditional central air conditioning systems, multi split central air conditioning has the following characteristics:

Energy saving and low operating costs.

Advanced control and reliable operation.

The unit has good adaptability and a wide range of cooling and heating temperatures.

High design freedom, easy installation and billing.

Compared with traditional air conditioning, multi split air conditioning has significant advantages: it adopts a new concept and integrates various high-tech technologies such as one to many technology, intelligent control technology, multiple health technology, energy-saving technology, and network control technology, meeting consumers' requirements for comfort, convenience, and other aspects.

Compared to multiple household air conditioners, multi split air conditioners require less investment and only use one outdoor unit. They are easy to install, aesthetically pleasing, and have flexible and convenient control. It can achieve centralized management of indoor units and adopt network control. It can start one indoor unit separately or multiple indoor units simultaneously, making control more flexible and energy-efficient.

Multi split air conditioners take up less space. Only one outdoor unit can be placed on the roof, which is compact, beautiful, and space saving.

Long piping and high drop. Multi split air conditioners can be installed with ultra long pipes of 125 meters, and the indoor unit drop can reach 50 meters; The height difference between two indoor units can reach up to 30 meters, making the installation of multi split air conditioners easy and convenient.

The indoor units used in multi split air conditioners can be selected in various specifications, and styles can be freely matched. Compared with general central air conditioning, it avoids the problem of high energy consumption and turning on all at once, making it more energy-efficient. In addition, automated control avoids the problem of requiring dedicated computer rooms and dedicated personnel for general central air conditioning.

Another major feature of multi split central air conditioning is intelligent network central air conditioning. It can drive multiple indoor units with one outdoor unit, and can be connected to a computer network through its network terminal interface. The computer can remotely control the operation of the air conditioning, meeting the modern information society's pursuit of network appliances.

Related comparisons

Compared to centralized central air conditioning

1.1 Screw unit central air conditioning system

The core of a screw unit is the use of a screw compressor. This compressor is a rotary positive displacement gas compressor that can perform single-stage compression at low evaporation temperatures or high compression ratios. Through a slide valve device, the refrigeration capacity can be adjusted within the range of 10% to 100%. The COP value of the screw unit is relatively high, but there is a certain amount of cooling loss when it is transported to the customer's end through water carrier, and it can only achieve single cooling. Heating also requires additional heating devices such as boilers.

1.2 Air cooled heat pump centralized central air conditioning system

The conveying medium of air-cooled heat pump units is usually aqueous solution. It generates air conditioning cold/hot water through an outdoor host and delivers it to various end devices indoors through a piping system; At the end device, cold/hot water exchanges heat with indoor air to generate cold/hot air, thereby eliminating the room's cooling/heating load. It is a type of air conditioning system that generates cold/heat in a centralized manner, but distributes the load of each room.

The indoor terminal device of this system is usually a fan coil unit. Fan coil units can generally adjust their fan speed (or adjust the amount of water passing through the coil through a bypass valve) to regulate the cold/heat input into the room. Therefore, this system can be individually adjusted for each air-conditioned room to meet the different air conditioning needs of each room, while also having good energy efficiency. But the cold and hot water distribution system occupies a certain installation space.

1.3 Multi connected air conditioning unit

Its working principle is that the control system collects indoor comfort parameters, outdoor environmental parameters, and state parameters that characterize the operation status of the refrigeration system. Based on the system operation optimization criteria and human comfort criteria, the compressor air delivery volume is adjusted through frequency conversion and other means, and all controllable components such as fans and expansion valves of the air conditioning system are controlled to ensure the comfort of the indoor environment and to make the air conditioning system work stably in the optimal working state.

Multi split air conditioning system is a high-efficiency refrigerant air conditioning system that timely meets the indoor cooling and heating load requirements by controlling the refrigerant circulation of the compressor and the refrigerant flow entering the indoor heat exchanger in the air conditioning system. Multi split air conditioning systems require the use of variable frequency compressors, multi pole compressors, unloading compressors, or a combination of multiple compressors to achieve compressor capacity control; Electronic expansion valves or other auxiliary circuits need to be installed in the refrigeration system to regulate the flow of refrigerant entering the indoor unit; By controlling the fan speed product of indoor and outdoor heat exchangers, the capacity of the heat exchanger can be adjusted.

After the gradual maturity of variable frequency speed regulation and electronic expansion valve technology, variable frequency multi split air conditioning systems commonly use variable frequency compressors and electronic expansion valves. The air conditioning system operates under conditions of constantly changing ambient temperature and indoor load, and the various components of the system and the environment interact with each other. Therefore, the state of the multi split air conditioning system is constantly changing, and it is necessary to adjust the capacity of the air conditioning system in a timely manner through its control system to eliminate its impact, which is a flexible adjustment system.

Result: The screw unit and air-cooled heat pump transfer heat and cold through a secondary carrier water, resulting in a certain loss of heat and cold. On the other hand, the multi split unit directly exchanges heat and cold through a refrigerant without a secondary carrier, making it more energy-efficient.