CN104567095A - Composite ground-source heat pump system based on asphalt pavement heat accumulation - Google Patents

Abstract

The invention discloses a composite ground source heat pump system based on asphalt pavement heat storage, comprising: underground buried pipes, ground source heat pump units, air conditioner user terminals, road buried pipes, ground source side water collectors and ground source side water diversion There are six parts. The main feature described above is to use the asphalt pavement as the heat collector, share the buried pipe heat exchanger with the ground source heat pump system, and store the solar heat collected by the asphalt pavement underground in transitional seasons and non-air-conditioning periods in summer, as a heat load dominant The auxiliary heat source of the ground source heat pump air conditioning system, so as to meet the cooling and heating load needs of the users of the ground source heat pump system throughout the year, improve the overall efficiency of the system, ensure the balance of the cooling and heating load of the buried pipe heat exchanger throughout the year, and ensure its long-term operation When time runs, it will not cause failure due to cold accumulation. The pavement heat collection system uses the same working medium as the buried tube heat exchanger, and is connected with the buried tube heat exchanger through a sub-collector. The heat collection system uses the asphalt pavement as the heat collection device, which does not occupy additional installation space. Compared with other auxiliary heat source systems, such as solar collectors, electric heating water tanks, etc., this system has the advantages of low cost, low operation and maintenance costs, and also has high environmental benefits.

Description

A composite ground source heat pump system based on asphalt pavement heat storage

Technical field:

The invention relates to a composite ground source heat pump system based on asphalt pavement heat storage, which belongs to the technical fields of building environment and equipment engineering and refrigeration engineering.

Background technique:

In winter, the ground source heat pump system raises the temperature of the low-level heat energy in the earth through the heat pump unit to heat the building, and at the same time stores the cold energy in the building underground for use in summer; Moving underground, the building is cooled while heat is stored for winter use.

In most areas of North China and Northeast my country, the heating load required for building heating and domestic hot water throughout the year is often greater than the cooling load required in summer. If the ground source heat pump system is used alone, the heat extracted from the buried tube heat exchanger in winter is much greater than the heat input to the buried tube heat exchanger in summer. At this time, the excess cooling capacity will accumulate in the underground heat exchanger, causing the annual average underground temperature to decrease. Changes in the annual average temperature of the rock and soil around the heat exchanger will affect the long-term heat transfer performance of the buried tube heat exchanger, and even cause the ground source heat pump system to fail. In the prior art, for a building whose heating load is greater than the cooling load demand, how to solve the underground heat balance, reduce energy consumption, and meet the cooling and heating load demand of the building is a technical problem faced by the ground source heat pump system. At present, solar collectors are mostly used in engineering as auxiliary heat source equipment for seasonal heat storage of buried pipe heat exchange to balance the underground thermal environment. However, installing solar thermal collectors in large areas has the disadvantage of high initial investment, and is often limited by insufficient installation area. Another available method is ground source heat pump plus boiler auxiliary heating. Its disadvantage is that it needs to consume more conventional fossil fuels.

Invention content:

In view of the above background, in order to solve the technical problem of unbalanced underground cooling and heating loads in the application of ground source heat pumps in buildings with dominant heat loads, and to meet the requirements of low-cost and high-efficiency operation, this patent proposes a heat storage system based on asphalt pavement. Composite ground source heat pump system.

A composite ground source heat pump system based on asphalt pavement heat storage proposed by the present invention mainly consists of underground pipes, ground source heat pump units, air conditioner user terminals, road buried pipes, ground source side water collectors and ground source side water separators. Partial composition. The underground pipe is connected to the ground source side water separator, the ground source side water collector, and the ground source heat pump unit through pipelines; the ground source heat pump unit is connected to the end of the air conditioner user through pipelines; the road buried The pipe is communicated with the water separator on the ground source side and the water collector on the ground source side through pipelines.

In order to provide the system with good power for pipeline water circulation, a thermal storage side circulation pump is installed on the connecting pipeline between the buried pipe on the road surface and the water collector on the ground source side; the connection between the ground source heat pump unit and the water collector on the ground source side A heat pump side circulation pump is arranged on the pipeline; an air conditioner side circulation pump is arranged on the connecting pipeline between the ground source heat pump unit and the air conditioner user end.

In order to facilitate the switching of different functions of the system, a valve is set on the connecting pipeline between the road buried pipe and the water collector on the ground source side; a valve is set on the connecting pipeline between the ground source heat pump unit and the water collector on the ground source side.

The compound ground source heat pump system based on asphalt pavement heat storage proposed by the present invention has the function of the traditional ground source heat pump system, that is, the compound system also has the function of cooling in summer and heating in winter: in summer, the circulating fluid of the underground pipe is in the heat pump The unit absorbs the heat from the building and the power of the unit, and then releases the heat to the ground through flow. While cooling the building, the heat is stored underground for use in winter; It absorbs low-grade heat energy, and then raises the temperature of the low-grade heat energy through the heat pump unit to heat the building. At the same time, it stores the cold energy in the building underground for use in summer. In the transitional season or non-air-conditioning period, the high-efficiency heat collection characteristics of asphalt pavement can be used to fully collect solar radiation energy, and this part of the heat can be stored underground through the circulation pipeline, so as to increase the temperature of the underground soil in winter and alleviate the heat caused by cold and heat throughout the year. The phenomenon of cold accumulation caused by balance.

The advantages of this compound ground source heat pump system based on asphalt pavement heat storage are: (1) The system uses solar energy and shallow geothermal energy to effectively alleviate the imbalance between cold and heat in the ground and improve the operating efficiency of the ground source heat pump system; (2) The solar energy collected by the asphalt pavement is stored underground through the pavement buried pipe and circulation pipeline, which reduces the temperature of the asphalt pavement, greatly reduces the heat released by the asphalt pavement to the surrounding environment, and improves the thermal comfort of the environment; (3) ) The auxiliary heat source part of the system includes road buried pipes and asphalt pavement, which makes full use of the space under the roadbed, does not need to occupy other space, and has the advantages of low initial investment (4) In addition to the small amount of power consumption when the circulating water pump is turned on during heat storage , no other energy consumption, low operating costs.

Description of drawings:

Fig. 1 is a schematic diagram of the composite ground source heat pump system of the present invention;

Fig. 2 is a schematic diagram of the system of the present invention when the heat pump unit operates in summer and winter;

Fig. 3 is the schematic diagram of the system when the present invention operates in the transitional season and non-air-conditioning period in summer

The marks of the components in the figure are as follows: 1. Road buried pipe; 21. Heat pump side circulation pump; 22. Heat storage side circulation pump; 23. Air conditioner side circulation pump; 3. Ground source heat pump unit, 41. Valve; 42. Valve ; 5. Air-conditioning user terminal; 6. Water collector; 7. Water separator; 8. Underground buried pipe.

Detailed ways:

The specific implementation of the present invention will be further described below in conjunction with accompanying drawing:

Please refer to Fig. 1, the present invention includes road buried pipe 1, heat pump side circulation pump 21, heat storage circulation pump 22, air conditioner side circulation pump 23, ground source heat pump unit 3, valve 41, valve 42, air conditioner user terminal 5, ground source Side water collector 6, ground source side water separator 7, underground buried pipe 8. The underground pipe 8 is connected to the ground source side water separator 7, the ground source side water collector 6, and the ground source heat pump unit 3 through pipelines; the heat pump unit 3 is connected to the air conditioner user terminal 5 through pipelines; The road buried pipe 1 communicates with the ground source side water separator 7 and the ground source side water collector 6 through pipelines. In order to provide the system with good power for pipeline water circulation, a thermal storage side circulation pump 22 is arranged on the connecting pipeline between the road surface buried pipe 1 and the ground source side water collector 6; the ground source heat pump unit 3 and the ground source side collector A heat pump side circulating pump 21 is installed on the connecting pipeline of the water heater 6; an air conditioner side circulating pump 23 is installed on the connecting pipeline between the ground source heat pump unit 3 and the air conditioner user terminal 5. In order to facilitate the switching of different functions of the system, a valve 42 is set on the connecting pipeline between the road surface buried pipe and the water collector on the ground source side; a valve 41 is set on the connecting pipeline between the heat pump unit and the water collector on the ground source side.

Please refer to FIG. 2 , in summer: turn on the circulation pump 21 on the heat pump side and the circulation pump 23 on the air conditioner side; open the valve 41; close the valve 42, and the heat pump unit switches to cooling mode. At this time, the buried pipe 8 , the water collector 6 on the ground source side, and the water separator 7 on the ground source side are in communication with the ground source heat pump unit 3 . The circulating fluid in the pipeline will pass through the ground source heat pump unit 3 to release the excess indoor heat to the ground through the buried pipe 8, and the heat pump unit consumes a small amount of electric energy to produce more cooling capacity to realize the refrigeration process. Winter: Turn on the circulation pump 21 on the heat pump side and the circulation pump 23 on the air conditioner side; open the valve 41 and close the valve 42, and the heat pump unit switches to the cooling mode. At this time, the buried pipe 8 , the water collector 6 on the ground source side, and the water separator 7 on the ground source side are in communication with the ground source heat pump unit 3 . The circulating fluid in the pipeline absorbs underground heat through the buried pipe 8, and then raises the temperature through the ground source heat pump unit 3, and releases the heat to the room to realize the heating process.

Please refer to FIG. 3 , transitional season or non-air-conditioning period in summer: turn on heat storage circulation pump 22; open valve 42; close valve 41. At this time, the underground buried pipe 8 , the ground source side water collector 6 , and the ground source side water separator 7 are in communication with the road surface buried pipe 1 . The circulating fluid in the pavement buried pipe 1 exchanges heat with the road surface through the pavement buried pipe, absorbs solar radiation heat, and the temperature of the circulating fluid rises. The heated circulating fluid enters the buried pipe 8 through the pipeline, exchanges heat with the surrounding soil, and stores solar heat underground for heating in winter.

Claims (3)

1. the composite ground source heat pump system based on bituminous paving accumulation of heat, comprise underground buried tube, earth source heat pump unit, air conditioner user end, road surface pipe laying, ground source water collector and ground source water knockout drum six part, it is characterized in that described underground buried tube and ground source water knockout drum, source water collector, earth source heat pump unit be connected by pipeline; Described earth source heat pump unit and air conditioner user end are connected by pipeline; Described road surface pipe laying and ground source water knockout drum, source water collector be connected by pipeline.

2. the composite ground source heat pump system based on bituminous paving auxiliary regenerator according to claim 1, it is characterized in that conditioning in Transition Season or summer non-NULL timing section: open accumulation of heat circulating pump 22; Open valve 42; Valve-off 41.Now underground buried tube 8, source water collector 6, source water knockout drum 7 be communicated with road surface pipe laying 1.Circulation fluid in road surface pipe laying 1 carries out heat exchange by road surface pipe laying and road surface, draws solar radiant heat, and circulation fluid temperature raises.Entered underground buried tube 8 by the circulation fluid heated by pipeline, with surrounding soil by carrying out heat exchange, solar heat being stored in underground, using in order to Winter heat supply.

3. according to claim 1,2 based on the composite ground source heat pump system based on bituminous paving accumulation of heat, it is characterized in that valve 41 is identical with circulating pump 21 action, valve 42 is identical with circulating pump 22 action.The switching of valve is relevant with the function of whole system.When system uses as heat-supply metering charge, valve 41 is open-minded, and circulating pump 21 starts; When system uses as hold over system, valve 42 is open-minded, and circulating pump 22 starts.Valve switch has come by automatic control.