Large-temperature-difference heat exchange device based on electric compression heat pump

Abstract

A large-temperature-difference heat exchange device based on an electric compression type heat pump is connected with a primary network water supply pipe and a secondary network water return pipe and is characterized by comprising an absorption type heat pump, a heat exchanger and the electric compression type heat pump, the primary network water supply pipe is communicated with the primary network water return pipe sequentially through the absorption type heat pump, the heat exchanger and the electric compression type heat pump, and the secondary network water return pipe is communicated with the secondary network water return pipe. The secondary network water return pipe is communicated with the secondary network water supply pipe through the absorption heat pump, the heat exchanger or the electric compression heat pump; compared with the prior art, the electric compression type heat pump actively absorbs heat of the primary network hot water flowing back to the primary network water return pipe, the temperature of the primary network hot water is reduced, the temperature difference between supply water and return water of the primary network is increased, and conveying energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heating systems, and in particular to a large temperature difference heat exchange device based on an electric compression heat pump. Background Art

[0002] The greater the temperature difference between the supply and return water of the primary network, the smaller the flow rate of the primary network, and thus the power consumption of the circulating water pump is also smaller, the transmission energy consumption is also lower, and at the same time, the diameter of the primary network can be effectively reduced, reducing the system investment. At present, the supply and return water temperature of the primary network of the central heating system is generally 130℃ / 70℃, and the supply and return water temperature difference is only 60℃; there are also absorption-type large temperature difference heat exchange units on the market that can reduce the return water temperature of the primary network to 25℃, which can further increase the supply and return water temperature difference of the primary network, but the absorption-type large temperature difference heat exchange unit is subject to the performance of the absorption heat pump and the water supply temperature of the primary network, and the reduction of the return water temperature of the primary network is limited.

[0003] The Chinese patent application number 202111624972.4 discloses a gas supplementary combustion type large temperature difference heat exchange unit and its operation method. The above disclosed gas supplementary combustion type large temperature difference heat exchange unit uses an absorption heat exchange device, a steam ejector device and a steam-water heat exchanger to heat the primary network water supply by using the latent heat of vaporization of water. The above disclosed gas supplementary combustion type large temperature difference heat exchange unit is subject to the performance of gas supplementary combustion, resulting in a limited temperature difference formed by the primary network supply and return water. Utility Model Content

[0004] In view of the above shortcomings, the technical problem to be solved by the utility model is to provide a large temperature difference heat exchange device based on an electric compression heat pump, so as to reduce the temperature of the return water of the primary network and increase the supply and return water temperature difference of the primary network.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a large temperature difference heat exchange device based on an electric compression heat pump, connected to the primary network water supply pipe and the secondary network return pipe, characterized in that it includes an absorption heat pump, a heat exchanger and an electric compression heat pump; the primary network water supply pipe is connected to the primary network return pipe through the absorption heat pump, the heat exchanger and the electric compression heat pump in sequence; the secondary network return pipe is connected to the secondary network water supply pipe through the absorption heat pump, or the heat exchanger, or the electric compression heat pump.

[0006] As a preferred solution of the utility model, the absorption heat pump includes a generator, a first evaporator and a first condenser.

[0007] As a preferred solution of the utility model, the inlet of the generator is connected to the primary network water supply pipe; the inlet of the first condenser is connected to the secondary network return pipe; and the outlet of the first condenser is connected to the secondary network water supply pipe.

[0008] As a preferred solution of the utility model, the heat exchanger includes a first flow channel and a second flow channel, and the fluid flowing through the first flow channel performs heat exchange with the fluid flowing through the second flow channel.

[0009] As a preferred solution of the utility model, the inlet of the second flow channel is connected to the secondary network water return pipe; the outlet of the second flow channel is connected to the secondary network water supply pipe.

[0010] As a preferred solution of the utility model, the inlet of the first flow channel is connected to the outlet of the generator; the outlet of the first flow channel is connected to the inlet of the first evaporator.

[0011] As a preferred solution of the utility model, the electric compression heat pump includes a second evaporator and a second condenser.

[0012] As a preferred solution of the utility model, the outlet of the second evaporator is connected to the primary network return pipe; the inlet of the second condenser is connected to the secondary network water supply pipe; and the outlet of the second condenser is connected to the secondary network return pipe.

[0013] As a preferred solution of the present invention, the heat exchanger is a plate heat exchanger.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the heat of the primary network hot water flowing back into the primary network return pipe is actively absorbed by the electric compression heat pump, the temperature of the primary network hot water is lowered, the supply and return water temperature difference of the primary network is increased, and the transportation energy consumption is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a large temperature difference heat exchange device based on an electric compression heat pump provided in an embodiment of the present application;

[0016] Figure numerals: primary network water supply pipe a, primary network return pipe b, secondary network water supply pipe c, secondary network return pipe d, absorption heat pump 1, generator 1-1, first evaporator 1-2, first condenser 1-3, heat exchanger 2, first flow channel 2-1, second flow channel 2-2, electric compression heat pump 3, second evaporator 3-1, second condenser 3-2. DETAILED DESCRIPTION

[0017] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0018] See also Figure 1 , Figure 1 A schematic structural diagram of a large temperature difference heat exchange device based on an electric compression heat pump provided in an embodiment of the present application is shown.

[0019] like Figure 1As shown, a large temperature difference heat exchange device based on an electric compression heat pump is connected to a primary network water supply pipe a and a secondary network return pipe d, and includes an absorption heat pump 1, a heat exchanger 2 and an electric compression heat pump 3; the primary network water supply pipe a is connected to the primary network return pipe b through the absorption heat pump 1, the heat exchanger 2 and the electric compression heat pump 3 in sequence; the secondary network return pipe d is connected to the secondary network water supply pipe c through the absorption heat pump 1, or the heat exchanger 2, or the electric compression heat pump 3.

[0020] Specifically, the primary network hot water in the primary network water supply pipe a flows through the absorption heat pump 1, the heat exchanger 2 and the electric compression heat pump 3 in sequence for heat exchange, thereby reducing the temperature of the primary network hot water flowing back to the primary network return pipe b; the secondary network hot water in the secondary network return pipe d flows through the absorption heat pump 1, the heat exchanger 2 and the electric compression heat pump 3 in sequence for heat exchange, thereby increasing the temperature of the secondary network hot water flowing into the secondary network water supply pipe c.

[0021] Furthermore, the secondary network hot water exchanges heat with the primary network hot water through the absorption heat pump 1, the heat exchanger 2 and the electric compression heat pump 3, transferring the heat in the primary network hot water to the secondary network hot water, thereby reducing the temperature of the primary network hot water.

[0022] As an option in the embodiment of the present application, the absorption heat pump 1 includes a generator 1-1, a first evaporator 1-2 and a first condenser 1-3.

[0023] like Figure 1 As shown, specifically, the hot water in the primary network flows through the generator 1-1 in the absorption heat pump 1 and enters the first flow channel 2-1 in the heat exchanger 2, then flows out from the first flow channel 2-1 in the heat exchanger 2, and then flows through the first evaporator 1-2 in the absorption heat pump 1; a part of the hot water in the secondary network flows through the first condenser 1-3 in the absorption heat pump 1 and then flows into the secondary network water supply pipe c.

[0024] As an optional embodiment of the present application, the inlet of the generator 1-1 is connected to the primary network water supply pipe a; the inlet of the first condenser 1-3 is connected to the secondary network return pipe d; and the outlet of the first condenser 1-3 is connected to the secondary network water supply pipe c.

[0025] like Figure 1 As shown, specifically, the primary network hot water provided by the primary network water supply pipe a flows into the inlet of the generator 1-1; part of the secondary network hot water provided by the secondary network return pipe d flows into the first condenser 1-3, and this part of the secondary network hot water flows back from the first condenser 1-3 to the secondary network water supply pipe c.

[0026] As an option in the embodiment of the present application, the heat exchanger 2 includes a first flow channel 2-1 and a second flow channel 2-2, and the fluid flowing through the first flow channel 2-1 performs heat exchange with the fluid flowing through the second flow channel 2-2.

[0027] like Figure 1 As shown, specifically, the fluid in the first flow channel 2-1 and the fluid in the second flow channel 2-2 perform heat exchange in a manner that heat is transferred from the high-temperature fluid to the low-temperature fluid.

[0028] As an optional embodiment of the present application, the inlet of the second flow channel 2-2 is connected to the secondary network return pipe d; the outlet of the second flow channel 2-2 is connected to the secondary network supply pipe c.

[0029] like Figure 1 As shown, specifically, part of the secondary network hot water provided by the secondary network return pipe d flows into the second flow channel 2-2, and this part of the secondary network hot water flows back to the secondary network supply pipe c from the second flow channel 2-2.

[0030] As an option in the embodiment of the present application, the inlet of the first flow channel 2-1 is connected to the outlet of the generator 1-1; the outlet of the first flow channel 2-1 is connected to the inlet of the first evaporator 1-2.

[0031] like Figure 1 As shown, specifically, the primary network hot water flowing out of the generator 1-1 flows through the first flow channel 2-1 for heat exchange, and the primary network hot water flows into the first evaporator 1-2 after heat exchange in the first flow channel 2-1.

[0032] As an option in the embodiment of the present application, the electric compression heat pump 3 includes a second evaporator 3 - 1 and a second condenser 3 - 2 .

[0033] like Figure 1 As shown, specifically, the primary network hot water flows through the second evaporator 3-1, and the second evaporator 3-1 actively absorbs the heat in the primary network hot water to reduce the temperature of the primary network hot water; the secondary network hot water part flows through the second condenser 3-2 in the electric compression heat pump 3, and the electric compression heat pump 3 transfers the heat actively absorbed by the second evaporator 3-1 to this part of the secondary network hot water to increase the temperature of this part of the secondary network hot water.

[0034] As an optional embodiment of the present application, the outlet of the second evaporator 3-1 is connected to the primary network return pipe b; the inlet of the second condenser 3-2 is connected to the secondary network water supply pipe c; the outlet of the second condenser 3-2 is connected to the secondary network return pipe d.

[0035] like Figure 1 As shown, specifically, the primary network hot water after absorbing heat in the second evaporator 3-1 flows back to the primary network return pipe b; the secondary network hot water part provided by the secondary network return pipe d flows into the second condenser 3-2, and this part of the secondary network hot water flows back to the secondary network supply pipe c from the second condenser 3-2.

[0036] As an option in the embodiment of the present application, the heat exchanger 2 is a plate heat exchanger.

[0037] In actual use, Figure 1 As shown, specifically:

[0038] The primary network hot water flows out from the primary network water supply pipe a to the generator 1-1 in the absorption heat pump 1, and then flows out from the generator 1-1 to the first flow channel 2-1 of the heat exchanger 2 for heat exchange, and then flows out from the first flow channel 2-1 to the first evaporator 1-2 in the absorption heat pump 1. The first evaporator 1-2 absorbs the heat of the primary network hot water and reduces the temperature of the primary network hot water to increase the supply and return water temperature difference of the primary network. Finally, the primary network hot water flows back from the first evaporator 1-2 to the primary network return water pipe b.

[0039] The hot water in the secondary network is divided into three parts and flows out from the secondary network return pipe d. One part flows out to the first evaporator 1-2 in the absorption heat pump 1 for heat exchange, and then flows back to the secondary network water supply pipe c; one part flows out to the second flow channel 2-2 in the heat exchanger 2 for heat exchange, and then flows back to the secondary network water supply pipe c; one part flows out to the second flow channel 2-2 in the electric compression heat pump 3 for heat exchange, and then flows back to the secondary network water supply pipe c.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0041] Although this article uses more of the following terms: primary network water supply pipe a, primary network return pipe b, secondary network water supply pipe c, secondary network return pipe d, absorption heat pump 1, generator 1-1, first evaporator 1-2, first condenser 1-3, heat exchanger 2, first flow channel 2-1, second flow channel 2-2, electric compression heat pump 3, second evaporator 3-1, second condenser 3-2, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A large temperature difference heat exchange device based on an electric compression heat pump, connected to a primary network water supply pipe (a) and a secondary network return pipe (d), characterized in that: It comprises an absorption heat pump (1), a heat exchanger (2) and an electric compression heat pump (3); The primary network water supply pipe (a) is connected to the primary network water return pipe (b) via the absorption heat pump (1), the heat exchanger (2) and the electric compression heat pump (3) in sequence; The secondary network water return pipe (d) is connected to the secondary network water supply pipe (c) via an absorption heat pump (1), or a heat exchanger (2), or an electric compression heat pump (3).

2. A large temperature difference heat exchange device based on an electric compression heat pump according to claim 1, characterized in that: The absorption heat pump (1) comprises a generator (1-1), a first evaporator (1-2) and a first condenser (1-3).

3. A large temperature difference heat exchange device based on an electric compression heat pump according to claim 2, characterized in that: The inlet of the generator (1-1) is connected to the primary network water supply pipe (a); the inlet of the first condenser (1-3) is connected to the secondary network return pipe (d); and the outlet of the first condenser (1-3) is connected to the secondary network water supply pipe (c).

4. The large temperature difference heat exchange device based on an electric compression heat pump according to claim 1, characterized in that: The heat exchanger (2) comprises a first flow channel (2-1) and a second flow channel (2-2), and a fluid flowing through the first flow channel (2-1) performs heat exchange with a fluid flowing through the second flow channel (2-2).

5. A large temperature difference heat exchange device based on an electric compression heat pump according to claim 4, characterized in that: The inlet of the second flow channel (2-2) is connected to the secondary network water return pipe (d); and the outlet of the second flow channel (2-2) is connected to the secondary network water supply pipe (c).

6. A large temperature difference heat exchange device based on an electric compression heat pump according to claim 4, characterized in that: The inlet of the first flow channel (2-1) is connected to the outlet of the generator (1-1); and the outlet of the first flow channel (2-1) is connected to the inlet of the first evaporator (1-2).

7. A large temperature difference heat exchange device based on an electric compression heat pump according to claim 1, characterized in that: The electric compression heat pump (3) comprises a second evaporator (3-1) and a second condenser (3-2).

8. A large temperature difference heat exchange device based on an electric compression heat pump according to claim 7, characterized in that: The outlet of the second evaporator (3-1) is connected to the primary network return water pipe (b); the inlet of the second condenser (3-2) is connected to the secondary network water supply pipe (c); and the outlet of the second condenser (3-2) is connected to the secondary network return water pipe (d).

9. A large temperature difference heat exchange device based on an electric compression heat pump according to claim 1, characterized in that: The heat exchanger (2) is a plate heat exchanger.

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