Ground source heat-pipe heat exchange system adapting to load change in operation cycle and control method

Abstract

The invention relates to a ground source heat-pipe heat exchange system and a control method. The system comprises an indoor water system, a variable frequency heat pump unit and a buried pipe heat exchange system, wherein the indoor water system is connected to the load side of the variable frequency heat pump unit, and the buried pipe heat exchange system is connected with the ground source side of the variable frequency heat pump unit; the buried pipe heat exchange system comprises a buried pipe heat exchanger, a flow sensor, a ground source side variable-frequency water pump, a plurality of pipeline electromagnetic valves, a plurality of temperature sensors and a controller, and the buried pipe heat exchanger is composed of a plurality of buried pipe subareas with different buried depths; the water main of each buried pipe is connected to a main water supply pipe, and a water return pipe is connected with a main water return pipe; the flow sensor and the ground source side variable-frequency water pump are connected with the main water return pipe, and each pipeline electromagnetic valve and each temperature sensor are respectively connected with the water mains and the main water supply pipe; and the controller is respectively connected with the flow sensor, the ground source side variable-frequency water pump, the pipeline electromagnetic valves and the temperature sensors. The ground source heat-pipe heat exchange system has the advantages of high heat exchange efficiency, low energy consumption and high economic and social benefits and can effectively facilitate the improvement on a soil temperature field.

Description

technical field [0001] The invention relates to the technical field of ground source heat pumps, in particular to a ground source heat pipe heat exchange system and control method that adapt to load changes within an operating cycle. Background technique [0002] With the rapid development of my country's economy and society, the proportion of energy consumption for heating and air conditioning in buildings to the total energy consumption of society continues to rise. With the increasingly prominent problems of energy and environmental protection, it has become an urgent task to adopt energy-saving technical methods in building heating and air conditioning. [0003] Ground source heat pump technology meets the heating and cooling needs of buildings through a set of equipment. The vertical buried tube ground source heat pump generally exchanges heat with the soil through a buried tube heat exchanger with a buried depth of 50 to 120 meters. The buried tube heat exchanger of ...

AI Technical Summary

Problems solved by technology

In addition, there are also some problems in the design and application process of the buried pipe ground source heat pump, which affect the energy saving effect of the system.

One is that the buried depth design of the system is unreasonable. At present, in most engineering designs, the design of the buried pipe group with a fixed buried depth is carried out according to the heat transfer results of the test wells in the previous test, combined with the load, that is, the depth of all buried pipes Similarly, when the system is operating under variable load conditions, the adjustment of the buried tube heat exchange system to system load changes is poor, which affects the heat transfer effect of the buried tube heat exchanger and often leads to the failure of the buried tube heat exchange system. Increased pump energy consumption

Second, the zoning of buried pipes is unreasonable. Most of the burial depth designs of buried pipes do not make reasonable zoning design and operation strategies in combination with the changing law of air-conditioning load during the system operation cycle, resulting in the inability to make full use of buried pipes under partial load conditions. heat transfer capacity, and at the same time affect the heat recovery of the soil to a certain extent

However, this method ignores the heat transfer efficiency of the buried tube heat exchanger, and there are hidden dangers that the flow rate in the buried tube heat exchanger is too small and the heat transfer efficiency is low

Images