Construction technology of mid deep coaxial sleeve ground source heat pump system and coaxial sleeve buried tube heat exchanger

Construction technology of mid deep coaxial sleeve ground source heat pump system and coaxial sleeve buried tube heat exchanger

With the development of technology and the deepening of environmental protection concepts, ground source heat pump systems, as an efficient and energy-saving air conditioning technology, are gradually gaining popularity among people. This system utilizes the stable temperature characteristics underground to extract heat from the ground through circulating pipelines, providing heating or cooling for buildings. The coaxial sleeve buried tube heat exchanger is an important component of the ground source heat pump system, and its construction technology directly affects the operation and service life of the system.

1、 Working principle of ground source heat pump system

Ground source heat pump systems are mainly composed of underground circulation pipelines, underground reservoirs or wells, indoor and outdoor units, etc. Its working principle is to utilize the characteristic of underground temperature being more stable than air temperature, and to heat or cool the refrigerant in the indoor and outdoor units through the circulation pipeline in the underground heat exchanger, thereby achieving heating or cooling. Specifically, when the system requires heating, the refrigerant in the outdoor unit absorbs the underground temperature in the underground heat exchanger, enters the compressor for compression and heating, and then is emitted through the indoor unit; When the system requires cooling, the opposite is true.

2、 Technical principle of coaxial sleeve buried tube heat exchanger

Coaxial sleeve buried pipe heat exchanger is a device that utilizes deep underground thermal energy. Its working principle is to exchange heat between the circulating medium inside the sleeve and the rock and soil outside the sleeve, thereby achieving the transfer and utilization of thermal energy. The device consists of an outer casing and an inner casing. The outer casing is in direct contact with the rock and soil, while the inner casing is responsible for transporting the circulating medium. When the circulating medium flows in the inner casing, it absorbs and releases heat energy through heat exchange with the outer casing and the rock and soil mass.

3、 Construction technology of coaxial sleeve buried tube heat exchanger

The construction technology of coaxial sleeve buried tube heat exchanger is crucial in ground source heat pump systems. The following are the main steps of this construction technology:

1. Preparation work before construction

Before construction, a detailed geological survey of the construction site is required to understand the geological structure, geotechnical properties, and groundwater level. Meanwhile, based on geological conditions and design requirements, develop reasonable construction plans and safety measures. In addition, it is necessary to prepare the required construction materials, equipment, and tools, such asPE-XaPipes, connecting fittings, fixtures, fasteners, cutting tools, measuring tools, welding tools, etc.

2. Laying of buried pipes

According to the design requirements of the ground source heat pump system, determine the layout, connection, depth, and spacing of the buried pipes. Then, use a cutting tool toPE-XaCut the pipes according to the design dimensions and lay them in the designed layout using fixtures and fasteners. During the laying process, it is necessary to maintain the flatness of the pipes and ensure consistent spacing between them. Meanwhile, it is also necessary to pay attention to the insulation and waterproofing measures of the pipeline to prevent it from being damaged by freezing or water immersion.

3. Fixed work of buried pipes

After the local buried pipeline is laid, it is necessary to fix the pipeline to ensure its stability and safety. The fixing method can be bracket fixation or soil fixation, and the specific choice should be determined according to the actual situation. During the fixation process, attention should be paid to maintaining the straightness of the pipeline and avoiding bending or deformation of the pipeline.

4. Construction of thermal insulation layer

After the completion of the protective layer construction, it is necessary to carry out the construction of the insulation layer to reduce the heat exchange between the buried pipes and the underground environment. Thermal insulation materials such as polyethylene foam can be used to fill the heat cutoff layer to reduce the heat loss of the pipeline. During the filling process, it is necessary to ensure uniform and dense filling to avoid gaps or bubbles.

5. Connection and testing of pipelines

After the local buried pipe laying, fixing, and insulation layer construction are completed, pipeline connection and testing work needs to be carried out. The connection can be made by hot melt connection or mechanical connection, and the specific choice should be determined according to the type of pipe and connection requirements. During the connection process, it is necessary to ensure a firm connection, good sealing, and avoid leakage and other situations. After the connection is completed, pressure testing and leak detection of the pipeline are also required to ensure its normal operation and safe use.

4、 Advantages and application prospects of coaxial sleeve buried tube heat exchanger

As an efficient and energy-saving air conditioning technology, coaxial sleeve buried tube heat exchanger has the following advantages:

1. Efficient and energy-saving: Ground source heat pump systemCOP(Performance coefficient) up to4-6It means that every consumption1Electricity can generate4-6The heat or cooling capacity of degrees is significantly energy-saving.

2. Environmental sustainability: Ground source heat pump systems utilize the stable temperature characteristics underground for heat exchange, without the need to burn fossil fuels, thus not producing harmful gases and pollutant emissions, meeting the requirements of environmental protection and sustainable development.

3. Wide range of applications: Ground source heat pump systems are used in various building types and climatic conditions, whether it is residential, commercial, or public buildings, and can be used for heating or cooling.

With the increasingly serious problems of energy shortage and environmental pollution, ground source heat pump systems, as an efficient, energy-saving, environmentally friendly and sustainable air conditioning technology, are receiving more and more attention and favor. In the future, with the continuous advancement of technology and the expansion of application scope, the construction technology of ground source heat pump systems and their coaxial sleeve buried tube heat exchangers will play a more important role in the construction industry, creating a more comfortable, healthy, and environmentally friendly living environment for people.