CN110470077A - A kind of capillary network underground heat acquisition system - Google Patents

Abstract

The invention discloses a capillary network geothermal heat collection system, which includes a ground source heat pump. The ground source heat pump includes a water inlet main pipe and a water return main pipe. The water inlet main pipe and the water return main pipe are respectively connected with an inlet water collector and a return A water collector, the inlet water collector and the return water collector are provided with a plurality of water inlet joints and return water joints, and the water inlet joints and return water joints are respectively connected to the water inlet header and the return water A header, each pair of inlet headers and return headers is connected with a capillary heat collector, the capillary heat collectors are arranged at intervals and connected to the inlet header and the return header at both ends. The capillary heat collector is laid horizontally under the permafrost layer. The main point of the technical solution is to use multiple capillary heat collectors to connect to the two water collectors and connect them to the heat exchanger of the heat pump. The characteristics of dense capillary tube arrangement, high heat transfer efficiency, large heat transfer area, buried tube depth below the permafrost layer, shallow installation depth, and simple installation.

Description

A capillary network geothermal collection system

technical field

The invention relates to a geothermal collection device, more specifically, it relates to a capillary network geothermal collection system.

Background technique

The buried pipes of traditional ground source heat pumps are divided into two types: vertical and horizontal. The pipes are generally made of polyethylene pipes with a diameter of 20-40mm and a wall thickness of 2-4mm with a pipe spacing of about 1m. into the soil. Due to the large distance between the tubes, to meet the required heat exchange area, a large soil area or depth is required, and the construction process requirements are also high.

Contents of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a capillary network geothermal heat collection system, which has the characteristics of large heat exchange area, high efficiency and simple installation.

To achieve the above object, the present invention provides the following technical solutions:

A capillary network geothermal heat collection system, including a ground source heat pump, characterized in that: the ground source heat pump includes a water inlet main pipe and a water return main pipe, and the water inlet main pipe and the water return main pipe are respectively connected with an inlet water collector and a return water collector. A water collector, the inlet water collector and the return water collector are provided with a plurality of water inlet joints and return water joints, and the water inlet joints and return water joints are respectively connected to the water inlet header and the return water A header, each pair of inlet headers and return headers is connected with a capillary heat collector, the capillary heat collectors are arranged at intervals and connected to the inlet header and the return header at both ends. The capillary heat collector is horizontally laid under the permafrost layer.

Preferably, the heat exchange medium in the capillary is brine.

Preferably, the capillary heat collector includes two spliced capillary networks, and the capillaries on the capillary network are equidistantly arranged at a distance of 20 mm.

Preferably, the capillary network is 5m long and 1.08m wide

Preferably, the vertical capillaries on the capillary network are equidistantly arranged with fixing strips.

Preferably, the capillary has an outer diameter of 4.3mm and a wall thickness of 0.8mm.

Preferably, each of the inlet water collector and return water collector is connected to at most 10 sets of capillary heat collectors.

Preferably, the water inlet header and the return water header are PP pipes with an outer diameter of 20 mm and a wall thickness of 2 mm.

Compared with the prior art, the present invention has the following beneficial effects:

1. In the present invention, a plurality of capillary heat collectors are connected to two water collectors, connected to the heat exchanger of the ground source heat pump, and used as an underground heat exchanger of the ground source heat pump by utilizing the characteristic of dense capillary tube arrangement. High heat exchange efficiency, large heat exchange area, buried pipe depth below the permafrost layer, shallow installation depth, and simple installation;

2. In order to prevent system operation from being blocked due to freezing at too low a temperature, salt water is used as the heat exchange medium in the geothermal collector;

3. By using up to 10 capillary heat exchangers, each capillary heat exchanger is spliced by two capillary networks with a length of 5 meters and a width of 1.08 meters, which is convenient for processing and installation, and the heat exchange capacity per unit area reaches 60W, 10kW The heat pump only needs 128-144 square meters of soil area.

Description of drawings

Figure 1 is a schematic diagram of the connection structure of a single capillary collector in this system;

Figure 2 is a schematic diagram of the structure of a single capillary collector.

In the figure: 10, ground source heat pump; 101, water inlet main pipe; 102, return water main pipe; 1, water inlet water collector; 11, water inlet joint; 111, water inlet header; 2, return water water collector; 21. Return water joint; 211. Return water header; 3. Capillary network; 31. Capillary; 311. Fixing bar.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

A capillary network geothermal heat collection system, referring to Figures 1 and 2, which includes a ground source heat pump 10, the ground source heat pump 10 includes a water inlet main pipe 101 and a return water main pipe 102, and the water inlet main pipe 101 and the water return main pipe 102 are respectively connected with water inlet The water collector 1 and the return water collector 2, the inlet water collector 1 and the return water collector 2 are provided with a plurality of water inlet joints 11 and return water joints 21, and the water inlet joints 11 and the return water joints 21 are respectively Connected with water inlet header 111 and return water header 211, each pair of water inlet header 111 and return water header 211 is connected with capillary tube 31 heat collector, and capillary tube 31 heat collector is sequentially connected in parallel to the water inlet water collector 1 and return water collector 2 to form a loop; the capillary tube 31 heat collector includes capillary tubes 31 that are arranged at intervals and connected to the water inlet header 111 and return water header 211 at both ends, and the capillary tube 31 heat collector is horizontal Laying under the permafrost layer, the depth is shallow, and the construction is convenient. The heat exchange medium in the capillary 31 is salt water, and the melting point is low to prevent freezing in winter. A plurality of capillary tubes 31 are used to connect the heat collectors to the water inlet joint 11 and the return water joint 21 respectively, the water inlet main pipe 101 and the return water main pipe 102 are connected to the heat exchanger in the ground source heat pump 10, and the capillary pipes 31 are used to arrange densely As the underground heat exchanger of the ground source heat pump 10, the heat exchange efficiency is high, the heat exchange area is large, the buried pipe depth is below the permafrost layer, the installation depth is shallow, and the installation is simple.

Each capillary tube 31 heat collector includes two spliced capillary tube networks 3, the length of the capillary tube network 3 is 5m, and the width is 1.08m. The capillary tubes 31 on the capillary tube network 3 are equidistantly arranged at a distance of 20 mm. On the capillary network 3, the vertical capillaries 31 are provided with fixed strips 311 at equal intervals. The fixed strips 311 adopt spaced buckles and are snapped onto the capillary tubes 31 to space the capillary tubes 31 equidistantly. The installation is stable. The outer diameter of the capillary tubes 31 The thickness is 4.3mm, the wall thickness is 0.8mm, and the PP material has strong corrosion resistance.

Each inlet water collector 1 and return water collector 2 is connected to at most 10 sets of capillary tubes 31 heat collectors, and the inlet water header 111 and the return water header 211 are PP tubes with an outer diameter of 20 mm and a wall thickness of 2 mm. The heat exchange capacity of the capillary tube 31 heat exchanger per unit area reaches 60W, and the ground source heat pump 10 of 10kW only needs a soil area of 128-144 square meters.

This embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to this embodiment without creative contribution as required after reading this specification, but as long as the claims of the present invention are protected by patent law.

Claims (8)

1. A capillary network geothermal heat acquisition system, comprising a ground source heat pump, characterized in that: the ground source heat pump includes a water inlet main pipe and a return water main pipe, and the water inlet main pipe and the return water main pipe are respectively connected with an inlet water collector and a return water collector, the inlet water collector and the return water collector are provided with a plurality of water inlet joints and return water joints, and the water inlet joints and return water joints are respectively connected with water inlet headers and Return water headers, each pair of inlet headers and return water headers is connected with a capillary heat collector. The capillary connected by the tube, and the capillary heat collector is laid horizontally under the frozen soil layer. 2. The capillary network geothermal heat collection system according to claim 1, characterized in that: the heat exchange medium in the capillary is brine. 3. The capillary network geothermal heat collection system according to claim 1, characterized in that: the capillary heat collector comprises two spliced capillary networks, and the capillary tubes on the capillary network are equidistantly arranged at a distance of 20 mm. 4. The capillary network geothermal heat collection system according to claim 3, characterized in that: the capillary network is 5m long and 1.08m wide. 5. The capillary network geothermal heat collection system according to claim 3, characterized in that: the vertical capillaries on the capillary network are equidistantly arranged with fixing strips. 6. The capillary network geothermal heat collection system according to claim 1, characterized in that: the outer diameter of the capillary is 4.3 mm, and the wall thickness is 0.8 mm. 7. The capillary network geothermal heat collection system according to claim 1, characterized in that: each of the inlet water collector and return water collector is connected to at most 10 sets of capillary heat collectors. 8. The capillary network geothermal heat collection system according to claim 1, characterized in that: the water inlet header and the return water header are PP pipes with an outer diameter of 20 mm and a wall thickness of 2 mm.