Air source heat pump using backwater waste heat

Abstract

An air-source heat pump utilizing waste heat from return water includes a compressor, a four-way valve, a main plate heat exchanger, a secondary plate heat exchanger, an evaporator, an electronic expansion valve, and a water terminal. The main plate heat exchanger includes a main refrigerant flow channel and a main water flow channel, while the secondary plate heat exchanger includes a secondary refrigerant flow channel and a secondary water flow channel. The compressor's exhaust port and return port are connected to terminals E and S of the four-way valve, respectively. Terminal D of the four-way valve, the main refrigerant flow channel, the electronic expansion valve, the evaporator, the secondary refrigerant flow channel, and terminal C of the four-way valve are sequentially connected. The main water flow channel and the secondary water flow channel are connected in series, forming a circulating heating loop with the water terminal and the secondary water flow channel. The secondary plate heat exchanger allows heat exchange between the return water from the water terminal and the refrigerant flowing from the evaporator to the compressor, increasing the compressor's return gas temperature and evaporation temperature, thus improving the compressor's efficiency.

Description

Technical Field

[0001] This utility model relates to an air source heat pump system, and more particularly to an air source heat pump hot water system. Background Technology

[0002] Current technology, specifically Chinese patent 201820957755.4, discloses a low-ambient-temperature air-source heat pump system. Its features include a compressor, an economizer, a finned evaporator, and a water-side heat exchanger. The compressor is connected to the evaporator, gas-liquid separator, and water-side heat exchanger via a four-way valve. The economizer is integrated into the bottom of the finned evaporator. By combining the economizer and evaporator, the economizer maintains the temperature of the evaporator's bottom and surface above 0°C, preventing frost and ice formation on the bottom surface and significantly expanding the heat pump system's applicability to low-temperature environments. However, the system suffers from several drawbacks: low ambient temperatures result in limited heat absorption by the evaporator, leading to relatively low overall heating capacity and energy efficiency. Utility Model Content

[0003] The purpose of this invention is to provide an air source heat pump that utilizes waste heat from the return water. It features increased return gas temperature and evaporation temperature of the compressor, and high energy efficiency at low temperatures.

[0004] This invention is implemented as follows: an air source heat pump utilizing waste heat from recycled water, characterized in that it includes a compressor, a four-way valve, a main plate heat exchanger, a secondary plate heat exchanger, an evaporator, an electronic expansion valve, and a water terminal.

[0005] A main plate heat exchanger includes a main refrigerant flow channel and a main water flow channel, while a secondary plate heat exchanger includes a secondary refrigerant flow channel and a secondary water flow channel.

[0006] The compressor's exhaust port and return port are connected to the E and S ends of the four-way valve, respectively. The D end of the four-way valve, the main refrigerant flow channel, the electronic expansion valve, the evaporator, the auxiliary refrigerant flow channel, and the C end of the four-way valve are connected in sequence. The main water flow channel and the auxiliary water flow channel are connected in series, and the main water flow channel, the water terminal, and the auxiliary water flow channel constitute a circulating heating circuit.

[0007] The air source heat pump that utilizes waste heat from the return water is characterized in that the power of the main plate heat exchanger is greater than that of the auxiliary plate heat exchanger.

[0008] This utility model discloses an air source heat pump that utilizes waste heat from return water. The sub-plate heat exchanger allows the return water at the water terminal to exchange heat with the refrigerant flowing from the evaporator to the compressor, thereby increasing the return gas temperature and evaporation temperature of the compressor and improving the compressor efficiency. Attached Figure Description

[0009] Figure 1 This is the front view of this utility model. Detailed Implementation

[0010] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0011] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0012] like Figure 1 As shown, an air source heat pump utilizing waste heat from recycled water includes a compressor 1, a four-way valve 2, a main plate heat exchanger 3, a secondary plate heat exchanger 4, an evaporator 5, an electronic expansion valve 6, and a water terminal 7.

[0013] The main plate heat exchanger 3 includes a main refrigerant flow channel and a main water flow channel, while the auxiliary plate heat exchanger 4 includes an auxiliary refrigerant flow channel and an auxiliary water flow channel.

[0014] The exhaust port and return port of compressor 1 are connected to the E and S ends of four-way valve 2, respectively. The D end of four-way valve 2, main plate heat exchanger 3, main refrigerant flow channel, electronic expansion valve 6, evaporator 5, secondary refrigerant flow channel of secondary plate heat exchanger 4 and C end of four-way valve 2 are connected in sequence. The main water flow channel of main plate heat exchanger 3 and the secondary water flow channel of secondary plate heat exchanger 4 are connected in series. The main water flow channel, water terminal 7 and secondary water flow channel form a circulating heating loop. That is, the outlet end of the main water flow channel, the water terminal, the return end of the secondary water flow channel, the outlet end of the secondary water flow channel and the return end of the main water flow channel are connected in sequence to form a circulating heating loop.

[0015] When this utility model is in use, the compressor is working, and the refrigerant enters the main refrigerant passage through the exhaust port of the compressor 1 and the ED end of the four-way valve 2, and then enters the return port of the compressor through the electronic expansion valve 6, the evaporator 5, the auxiliary refrigerant passage, and the SC end of the four-way valve.

[0016] The main water flow channel, heating terminal 7, and auxiliary water flow channel circulate; the refrigerant in the auxiliary refrigerant channel exchanges heat with the return water in the auxiliary water flow channel, absorbing the heat energy of the return water, and then enters the compressor, increasing the return gas temperature and evaporation temperature of the compressor, thus improving energy efficiency.

[0017] The power of the main plate heat exchanger 3 is greater than that of the auxiliary plate heat exchanger 4.

[0018] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air source heat pump utilizing waste heat from recycled water, characterized in that: This includes compressors, four-way valves, main plate heat exchangers, auxiliary plate heat exchangers, evaporators, electronic expansion valves, and water terminals. A main plate heat exchanger includes a main refrigerant flow channel and a main water flow channel, while a secondary plate heat exchanger includes a secondary refrigerant flow channel and a secondary water flow channel. The compressor's exhaust port and return port are connected to the E and S ends of the four-way valve, respectively. The D end of the four-way valve, the main refrigerant flow channel, the electronic expansion valve, the evaporator, the auxiliary refrigerant flow channel, and the C end of the four-way valve are connected in sequence. The main water flow channel and the auxiliary water flow channel are connected in series, and the main water flow channel, the water terminal, and the auxiliary water flow channel constitute a circulating heating circuit.

2. An air source heat pump utilizing waste heat from recycled water according to claim 1, characterized in that: The power of the main plate heat exchanger is greater than that of the auxiliary plate heat exchanger.

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