Anti-freeze fresh air handling unit with built-in heat pump

Abstract

This utility model belongs to the technical field of air conditioning and ventilation equipment, specifically relating to a freeze-proof fresh air handling unit with a built-in heat pump. It includes an air inlet duct, an air filter section, a heat pump preheating section, a hot water coil section, a supply fan section, and a heat pump preheating system consisting of an evaporator, a compressor, an air-cooled condenser, and a throttling valve connected via refrigerant piping. The heat pump preheating section is connected to the air-cooled condenser, and the evaporator is connected to the air conditioning hot water supply pipe. The air inlet section, air filter section, heat pump preheating section, hot water coil section, and supply fan section are sequentially connected to form a fresh air handling path. The heat pump preheating system transfers heat from the air conditioning hot water to the air-cooled condenser through refrigerant circulation to preheat the outdoor fresh air flowing through it. This utility model, through the integrated design of the heat pump and fresh air handling unit, achieves multiple functions including freeze protection in winter, energy-saving heating, and efficient cooling and dehumidification in summer. It features a compact structure, low energy consumption, and strong adaptability, making it suitable for various building scenarios requiring fresh air handling.

Description

Technical Field

[0001] This utility model belongs to the technical field of air conditioning and ventilation equipment, specifically, it relates to an antifreeze fresh air handling unit with a built-in heat pump. Background Technology

[0002] To meet the hygiene requirements of indoor occupants, a suitable amount of fresh air needs to be supplied to air-conditioned and heated rooms. In winter, the fresh air treatment process, in addition to filtration, requires heating the supplied fresh air, typically using hot water as the heating medium. In cold and frigid regions, when outdoor air temperatures are very low, heating outdoor fresh air with hot water carries the risk of freezing and cracking the heating coils, causing damage to the equipment and piping. To prevent the hot water coils from freezing and cracking, the usual practice is to install a separate preheating hot water system, maintaining a high-temperature hot water supply temperature throughout the day. This independent fresh air preheating system significantly increases initial equipment investment, resulting in high operating costs and substantial energy consumption. Utility Model Content

[0003] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a freeze-proof fresh air handling unit with a built-in heat pump.

[0004] According to the present invention, an antifreeze fresh air handling unit with a built-in heat pump includes an air inlet duct, an air filter section, a heat pump preheating section, a hot water coil section, a supply air fan section, and a heat pump preheating system consisting of an evaporator, a compressor, an air-cooled condenser, and a throttling valve connected by a refrigerant pipeline. The heat pump preheating section is connected to the air-cooled condenser, and the evaporator is connected to the air conditioning hot water supply pipeline. The air inlet section, air filter section, heat pump preheating section, hot water coil section, and supply air fan section are sequentially connected to form a fresh air handling path. The heat pump preheating system transfers the heat of the air conditioning hot water to the air-cooled condenser through refrigerant circulation to preheat the outdoor fresh air flowing through it.

[0005] In a preferred embodiment: the air inlet of the air inlet section is connected to a fresh air inlet duct, the air outlet of the air supply fan section is connected to a fresh air supply duct, and an insulated and airtight electric air valve is installed on the fresh air inlet duct. The insulated and airtight electric air valve is used to block the entry of outdoor fresh air when the unit is stopped.

[0006] In a preferred embodiment: the inlet end of the hot water coil section and the inlet end of the evaporator are both connected to the air conditioning hot water supply pipe. The inlet end of the evaporator is equipped with a first electric regulating valve, which is used to regulate the flow rate of hot water entering the evaporator. The inlet end of the hot water coil section is equipped with a second electric regulating valve, which is used to regulate the flow rate of hot water entering the hot water coil section.

[0007] In a preferred embodiment: the hot water coil section also serves as a cold water coil, and in summer, it is connected to air conditioning cold water to cool and dehumidify the fresh air.

[0008] In a preferred embodiment: the evaporator is an air-cooled evaporator, and a bypass pipe is provided on the fresh air supply duct.

[0009] In a preferred embodiment, the heat source of the evaporator can be replaced with a renewable low-grade heat source or low-temperature waste heat.

[0010] In a preferred embodiment: the air-cooled condenser is disposed between the air filter section and the hot water coil section.

[0011] In a preferred embodiment: the heat pump preheating system is equipped with a four-way reversing valve.

[0012] In a preferred embodiment, the system further includes an exhaust heat recovery device for recovering energy from the exhaust air to reduce the heat load on the fresh air.

[0013] In a preferred embodiment, the unit further includes a humidification section, a sterilization section, and a noise reduction section, which are disposed within the unit to meet indoor humidity, air quality, and noise requirements.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This utility model achieves multiple functions such as winter antifreeze, energy-saving heating, and efficient cooling and dehumidification through the integrated design of heat pump and fresh air unit. It features compact structure, low energy consumption, and strong adaptability, and is suitable for various building scenarios that require fresh air treatment. Attached Figure Description

[0016] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] In the picture:

[0019] Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0021] Example 1

[0022] like Figure 1As shown, this utility model discloses a freeze-proof fresh air handling unit with a built-in heat pump, including an air inlet pipe 1, an air filter section 2, a heat pump preheating section 3, a hot water coil section 4, a supply air fan section 5, and a heat pump preheating system composed of an evaporator 6, a compressor 7, an air-cooled condenser 8, and a throttling valve 9 connected by refrigerant pipes. The heat pump preheating section 3 is connected to the air-cooled condenser 8, and the evaporator 6 is connected to the air conditioning hot water supply pipe. The air inlet section 1, the air filter section 2, the heat pump preheating section 3, the hot water coil section 4, and the supply air fan section 5 are sequentially connected to form a fresh air handling path. The heat pump preheating system transfers the heat of the air conditioning hot water to the air-cooled condenser 8 through refrigerant circulation to preheat the outdoor fresh air flowing through it.

[0023] The air inlet of the air inlet section 1 is connected to the fresh air inlet duct 12, and the air outlet of the air supply fan section 5 is connected to the fresh air supply duct 14. The fresh air inlet duct 12 is equipped with an insulated and airtight electric air valve 13. The insulated and airtight electric air valve 13 is linked to the fresh air unit to start and stop. When the unit stops, it automatically closes to block the entry of outdoor fresh air.

[0024] Both the inlet of the hot water coil section 4 and the inlet of the evaporator 6 are connected to the air conditioning hot water supply pipe. The inlet of the evaporator 6 is equipped with a first electric regulating valve 10, which is used to regulate the flow rate of hot water entering the evaporator 6. The inlet of the hot water coil section 4 is equipped with a second electric regulating valve 11, which is used to regulate the flow rate of hot water entering the hot water coil section 4. The hot water coil section 4 also serves as a cold water coil, which is connected to the air conditioning cold water in summer to cool and dehumidify the fresh air. The evaporator 6 is an air-cooled evaporator. By opening a bypass pipe on the fresh air supply duct 14, the heated fresh air is used to transfer heat to the evaporator 6. The heat source of the evaporator 6 can be replaced with a renewable low-grade heat source or low-temperature waste heat to improve energy utilization.

[0025] The air-cooled condenser 8 is located between the air filter section 2 and the hot water coil section 4. The air-cooled condenser 8 is used to preheat the outdoor fresh air to above the freezing point. The heat pump preheating system is equipped with a four-way reversing valve. The four-way reversing valve is used to switch the heat pump to cooling mode in summer, so that the air-cooled condenser 8 becomes an evaporator to cool and dehumidify the fresh air.

[0026] Example 2

[0027] The basic structure of this embodiment is the same as that of Embodiment 1. This embodiment also adds an exhaust heat recovery device to recover the energy in the exhaust air to reduce the heat load of the fresh air. Humidification section, sterilization section and noise reduction section are added in the unit as needed to meet the requirements of indoor humidity, air quality and noise.

[0028] Working principle

[0029] When the electric airtight valve 13 is opened, outdoor fresh air enters the air inlet section 1 through the air inlet duct 12, is purified by the filter section 2, and enters the air-cooled condenser 8 of the heat pump preheating section 3. It absorbs the condensation heat released by the refrigerant and rises to above 0°C. It is then reheated to the set temperature by the hot water coil section 4 and sent into the room by the air supply fan section 5 through the air supply duct 14. The electric regulating valve 10 adjusts the hot water flow rate into the evaporator 6 according to the air temperature after the heat pump preheating section, and the electric regulating valve 11 adjusts the hot water flow rate according to the temperature after the hot water coil section.

[0030] By switching the heat pump to cooling mode through the four-way reversing valve, the high-temperature air conditioning chilled water is connected to the evaporator 6, and the refrigerant evaporates and absorbs heat at the air-cooled condenser 8 to cool and dehumidify the fresh air. The air conditioning chilled water temperature can be increased compared with traditional low-temperature chilled water, improving the energy efficiency of the chiller unit and reducing operating costs.

[0031] When the outdoor temperature exceeds the set threshold, the heat pump automatically shuts off, and heating is carried out only through the hot water coil to reduce energy consumption; when the unit stops, the insulated and airtight air valve 13 is closed in conjunction with the unit to block the entry of cold outdoor air and protect the equipment.

[0032] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A freeze-proof fresh air handling unit with a built-in heat pump, characterized in that, The system includes an air intake section (1), an air filter section (2), a heat pump preheating section (3), a hot water coil section (4), a blower section (5), and a heat pump preheating system consisting of an evaporator (6), a compressor (7), an air-cooled condenser (8), and a throttle valve (9) connected by refrigerant pipes. The heat pump preheating section (3) is connected to the air-cooled condenser (8), and the evaporator (6) is connected to the air conditioning hot water supply pipe. The air intake section (1), air filter section (2), heat pump preheating section (3), hot water coil section (4), and blower section (5) are connected in sequence to form a fresh air treatment path. The heat pump preheating system transfers the heat from the air conditioning hot water to the air-cooled condenser (8) through refrigerant circulation to preheat the outdoor fresh air flowing through it.

2. The freeze protection fresh air handling unit with in-built heat pump of claim 1, wherein, The air inlet of the air inlet section (1) is connected to a fresh air inlet duct (12), and the air outlet of the air supply fan section (5) is connected to a fresh air supply duct (14). A heat-insulated and airtight electric air valve (13) is installed on the fresh air inlet duct (12). The heat-insulated and airtight electric air valve (13) is used to block the entry of outdoor fresh air when the unit is stopped.

3. The freeze protection fresh air handling unit with a built-in heat pump of claim 1, wherein, The inlet of the hot water coil section (4) and the inlet of the evaporator (6) are both connected to the air conditioning hot water supply pipe. The inlet of the evaporator (6) is equipped with a first electric regulating valve (10), which is used to regulate the flow rate of hot water entering the evaporator (6). The inlet of the hot water coil section (4) is equipped with a second electric regulating valve (11), which is used to regulate the flow rate of hot water entering the hot water coil section (4).

4. The freeze protection fresh air handling unit with in-built heat pump of claim 3, wherein, The hot water coil section (4) also serves as a cold water coil, and in summer, it is connected to the air conditioning cold water to cool and dehumidify the fresh air.

5. The freeze protection fresh air handling unit with in-built heat pump of claim 3, wherein, The evaporator (6) is an air-cooled evaporator, and a bypass pipe is opened on the fresh air supply duct (14).

6. The freeze protection fresh air handling unit with a built-in heat pump of claim 5, wherein, The heat source of the evaporator (6) can be replaced with a renewable low-grade heat source or low-temperature waste heat.

7. The freeze protection and fresh air handling unit with an integrated heat pump of claim 1, wherein, The air-cooled condenser (8) is located between the air filter section (2) and the hot water coil section (4).

8. The freeze protection, heat pump, fresh air handling unit of claim 1, wherein, The heat pump preheating system is equipped with a four-way reversing valve.

9. The freeze protection heat pump fresh air handling unit of any of claims 1-8, wherein, It also includes an exhaust heat recovery device, which is used to recover energy from the exhaust air to reduce the heat load of the fresh air.

10. The freeze protection fresh air handling unit with a built-in heat pump of claim 9, wherein, It also includes humidification, sterilization and noise reduction sections installed in the unit to meet indoor humidity, air quality and noise requirements.

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