An energy-saving system for an unstable heat source heat pump

Abstract

This utility model discloses an energy-saving system for an unstable heat source heat pump, comprising: a compressor, an evaporator, and a condenser. The compressor is connected to the condenser via an exhaust pipe and to the evaporator via a suction pipe. The condenser is located above the evaporator. A refrigerant vapor connecting pipe, a refrigerant liquid connecting pipe, and a connecting pipe are provided between the evaporator and the condenser for controllable opening and closing. These pipes are used to transfer heat from the heat source to the condenser without external power. This utility model solves the problem of unstable operation of the heat pump system when the heat source temperature changes significantly. Furthermore, this system further reduces equipment energy consumption and investment. Specifically, through reasonable design, utilizing the existing evaporator and condenser of the heat pump unit, when the heat source temperature is high, the phase change of the refrigerant transfers heat from the heat source to the user-side condenser without external power, thus heating the user-side heat transfer medium.

Description

Technical Field

[0001] This utility model relates to the field of heat pump energy utilization technology, and in particular to an energy-saving system for an unstable heat source heat pump. Background Technology

[0002] In certain applications, heat pump systems experience significant temperature variations from the heat source, sometimes exceeding the user's temperature considerably. Directly using the heat pump for heating in such cases would exceed its operating range. While some technical solutions can meet the system's operational requirements, they also increase energy consumption and equipment investment. This system, with minimal investment, utilizes the phase change heat transfer of the refrigerant between the evaporator and condenser to transfer heat from the heat source to the condenser without requiring power, thus meeting user requirements. This approach not only boasts low energy consumption but also minimizes investment.

[0003] Therefore, an energy-saving heat pump system with an unstable heat source is needed to solve the above problems. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems of the above-mentioned energy-saving system of an unstable heat source heat pump, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide an energy-saving heat pump system with an unstable heat source, which is used to solve problems such as "high energy consumption and large investment in heat pump systems".

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an energy-saving system for an unstable heat source heat pump, comprising: a compressor, an evaporator, and a condenser. The compressor is connected to the condenser through an exhaust pipe and to the evaporator through an intake pipe. The condenser is located above the evaporator. A refrigerant vapor connecting pipe, a refrigerant liquid connecting pipe, and a connecting pipe that can be controlled to open and close are provided between the evaporator and the condenser, for transferring heat from the heat source to the condenser without power.

[0008] As a preferred embodiment of the unstable heat source heat pump energy-saving system of this utility model, wherein: the two ends of the refrigerant vapor connecting pipe are respectively fixed to the upper part of the evaporator and the condenser.

[0009] As a preferred embodiment of the unstable heat source heat pump energy-saving system of this utility model, a refrigerant vapor shut-off valve is fixedly provided on the refrigerant vapor connecting pipe.

[0010] As a preferred embodiment of the unstable heat source heat pump energy-saving system of this utility model, the two ends of the refrigerant liquid connecting pipe are respectively fixed at the lower part of the evaporator and the condenser.

[0011] As a preferred embodiment of the unstable heat source heat pump energy-saving system of this utility model, a refrigerant liquid shut-off valve is fixedly provided on the refrigerant liquid connecting pipe.

[0012] As a preferred embodiment of the unstable heat source heat pump energy-saving system of this utility model, the two ends of the connecting pipe are respectively fixed to the lower part of the evaporator and the condenser.

[0013] As a preferred embodiment of the unstable heat source heat pump energy-saving system of this utility model, an expansion valve is fixedly provided on the connecting pipe.

[0014] As a preferred embodiment of the unstable heat source heat pump energy-saving system of this utility model, wherein: the evaporator is fixedly provided with an evaporator inlet pipe and an evaporator outlet pipe.

[0015] As a preferred embodiment of the unstable heat source heat pump energy-saving system of this utility model, wherein: a condenser inlet pipe and a condenser outlet pipe are fixedly provided on the condenser.

[0016] The beneficial effects of this invention are that it solves the problem of unstable operation of the heat pump system when the heat source temperature changes greatly, and the system further reduces equipment energy consumption and equipment investment. Through reasonable design, this invention utilizes the original evaporator and condenser of the heat pump unit. When the heat source temperature is high, it uses the phase change of the refrigerant to transfer heat from the heat source to the user-side condenser without external power, thus heating the user-side heat transfer medium. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1 This is a schematic diagram of the structure of an energy-saving heat pump system with an unstable heat source according to the present invention.

[0019] Figure descriptions: 101, Compressor; 101a, Discharge pipe; 101b, Suction pipe; 102, Evaporator; 102a, Evaporator water inlet pipe; 102b, Evaporator water outlet pipe; 103, Condenser; 103a, Condenser water inlet pipe; 103b, Condenser water outlet pipe; 104, Refrigerant vapor connecting pipe; 104a, Refrigerant vapor shut-off valve; 105, Refrigerant liquid connecting pipe; 105a, Refrigerant liquid shut-off valve; 106, Connecting pipe; 106a, Expansion valve. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0023] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0024] Example 1

[0025] Reference Figure 1 This is the first embodiment of the present invention. This embodiment provides an energy-saving system for an unstable heat source heat pump. When the heat source temperature is higher than the user side temperature, it can achieve the purpose of heating without power. It includes: a compressor 101, an evaporator 102 and a condenser 103. The compressor 101 is connected to the condenser 103 through an exhaust pipe 101a and the compressor 101 is connected to the evaporator 102 through an intake pipe 101b. The condenser 103 is located above the evaporator 102. A refrigerant vapor connecting pipe 104, a refrigerant liquid connecting pipe 105 and a connecting pipe 106 that can be controlled to open and close are provided between the evaporator 102 and the condenser 103 for transferring heat from the heat source to the condenser 103 without power.

[0026] When the heat source temperature is higher than the operating temperature, the refrigerant vapor enters the condenser 103 through the refrigerant vapor connecting pipe 104 and releases a large amount of heat in the condenser 103, turning into refrigerant liquid. Due to the height difference between the condenser 103 and the evaporator 102, the refrigerant liquid flows into the evaporator 102 through the refrigerant liquid connecting pipe 105, completing a heating cycle without power.

[0027] Example 2

[0028] Reference Figure 1 This is the second embodiment of the present invention. Unlike the previous embodiment, the two ends of the refrigerant vapor connecting pipe 104 are respectively fixed on the upper part of the evaporator 102 and the condenser 103. Furthermore, a refrigerant vapor shut-off valve 104a is fixed on the refrigerant vapor connecting pipe 104.

[0029] The refrigerant liquid connecting pipe 105 has its two ends fixedly installed at the lower part of the evaporator 102 and the condenser 103, respectively. Furthermore, a refrigerant liquid shut-off valve 105a is fixedly installed on the refrigerant liquid connecting pipe 105.

[0030] The two ends of the connecting pipe 106 are fixedly installed at the lower part of the evaporator 102 and the condenser 103, respectively. Furthermore, an expansion valve 106a is fixedly installed on the connecting pipe 106.

[0031] The evaporator 102 is fixedly equipped with an evaporator inlet pipe 102a and an evaporator outlet pipe 102b, and the condenser 103 is fixedly equipped with a condenser inlet pipe 103a and a condenser outlet pipe 103b.

[0032] During operation, in a heat pump system, when the heat source temperature exceeds the required outlet water temperature of the condenser 103, the compression refrigeration system stops operating. The refrigerant vapor shut-off valve 104a on the refrigerant vapor connecting pipe 104 opens, and the refrigerant liquid shut-off valve 105a opens. The refrigerant liquid in the evaporator 102 is heated by the hot water entering from the evaporator inlet pipe 102a, transforming it into high-enthalpy refrigerant vapor. Simultaneously, the heat source water absorbs heat from the refrigerant, becoming low-temperature water that flows out through the evaporator outlet pipe 102b. At the same time, the refrigerant vapor passes through the refrigerant vapor connecting pipe 104 and the refrigerant vapor shut-off valve 105a. The refrigerant enters the upper part of condenser 103 and flows through the condenser heat exchange tube bundle. It is cooled by the low-temperature cooling water entering through condenser inlet pipe 103a, becoming liquid refrigerant and releasing a large amount of heat to the low-temperature cooling water entering through condenser inlet pipe 103a, heating the cooling water. Then, it flows out through condenser outlet pipe 103b to be used by the user. Due to the height difference between condenser 103 and evaporator 102, the liquid refrigerant in condenser 103 flows into evaporator 102 through refrigerant liquid connecting pipe 105 and refrigerant liquid shut-off valve 105a, thus completing one heating cycle. In this way, the low-temperature cooling water in condenser 103 is continuously heated by heat source water to achieve the purpose of heating.

[0033] When the heat source temperature is equal to the temperature on the condenser 103 side, and the falling film heat exchanger is used as the evaporator 102, the refrigerant liquid shut-off valve 105a and the refrigerant vapor shut-off valve 104a are closed, the compressor 101 starts, and the heat pump system enters the powered operation stage. The high-temperature vapor from the compressor 101 enters the condenser 103 through the exhaust pipe 101a, where it releases heat and becomes refrigerant liquid. At the same time, the low-temperature coolant entering through the condenser inlet pipe 103a is heated and flows out through the condenser outlet pipe 103a. 03b flows out and is sent to the user end; the refrigerant liquid in the condenser 103 is throttled by the expansion valve 106a and enters the evaporator 102, where it absorbs heat from the heat source water coming in from the evaporator water inlet pipe 102a and becomes high-enthalpy refrigerant vapor. It then enters the compressor 101 through the suction pipe 101b and is compressed before being discharged through the exhaust port 101a into the condenser 103, thus completing one heating cycle; at the same time, the heat source water absorbs heat from the refrigerant and becomes low-temperature water, which flows out through the evaporator water outlet pipe 102b.

[0034] In summary, this variable heat source heat pump energy-saving system solves the problem of unstable operation of the heat pump system when the heat source temperature changes greatly. Furthermore, the system further reduces equipment energy consumption and investment. Through a rational design, this invention utilizes the existing evaporator 102 and condenser 103 of the heat pump unit. When the heat source temperature is high, it leverages the phase change of the refrigerant to transfer heat from the heat source to the user side (condenser 103) without external power, thus heating the heat transfer medium on the user side.

[0035] It is worth noting that the entire device is controlled by a controller. Since the controller is a common device and belongs to the mature technology, its electrical connection relationship and specific circuit structure will not be described here.

[0036] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An energy-saving system for an unstable heat source heat pump, comprising a compressor (101), an evaporator (102), and a condenser (103), wherein the compressor (101) is connected to the condenser (103) via an exhaust pipe (101a), and the compressor (101) is connected to the evaporator (102) via an intake pipe (101b), characterized in that, The condenser (103) is located above the evaporator (102). A refrigerant vapor connecting pipe (104), a refrigerant liquid connecting pipe (105), and a connecting pipe (106) that can be controlled to open and close are provided between the evaporator (102) and the condenser (103) for transferring heat from the heat source to the condenser (103) without power.

2. The energy-saving system for an unstable heat source heat pump according to claim 1, characterized in that: The two ends of the refrigerant vapor connecting pipe (104) are respectively fixed to the upper part of the evaporator (102) and the condenser (103).

3. The energy-saving system for an unstable heat source heat pump according to claim 1, characterized in that: A refrigerant vapor shut-off valve (104a) is fixedly installed on the refrigerant vapor connecting pipe (104).

4. The energy-saving system for an unstable heat source heat pump according to claim 1, characterized in that: The two ends of the refrigerant liquid connecting pipe (105) are respectively fixed at the lower part of the evaporator (102) and the condenser (103).

5. The energy-saving system for an unstable heat source heat pump according to claim 1, characterized in that: A refrigerant liquid shut-off valve (105a) is fixedly installed on the refrigerant liquid connecting pipe (105).

6. The energy-saving system for an unstable heat source heat pump according to claim 1, characterized in that: The two ends of the connecting pipe (106) are respectively fixed to the lower part of the evaporator (102) and the condenser (103).

7. The energy-saving system for an unstable heat source heat pump according to claim 1, characterized in that: An expansion valve (106a) is fixedly installed on the connecting pipe (106).

8. The energy-saving system for an unstable heat source heat pump according to claim 1, characterized in that: The evaporator (102) is fixedly provided with an evaporator inlet pipe (102a) and an evaporator outlet pipe (102b).

9. The energy-saving system for an unstable heat source heat pump according to claim 1, characterized in that: The condenser (103) is fixedly provided with a condenser inlet pipe (103a) and a condenser outlet pipe (103b).

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