Building exhaust air energy recovery system

Abstract

The utility model discloses a building exhaust energy recycling system, including a plurality of exhaust unit, still include exhaust energy recycling unit, and exhaust unit includes the exhaust branch pipe of installation in the room, vertical exhaust shaft, exhaust main pipe, is provided with exhaust air valve, heat exchanger and exhaust fan on exhaust main pipe, and exhaust energy recycling unit includes main liquid supply line and main return liquid line, and heat exchanger is connected with main liquid supply line through first liquid supply branch pipe, and heat exchanger is connected with main return liquid line through first return liquid branch pipe. The utility model discloses the exhaust energy recycling unit of closed loop circuit can through heat exchange indirect recovery heat or cold content in building exhaust, and can with the heat exchange device in the recovery section of air conditioning system heat exchange, and then will heat or cold content transfer to air conditioning system, realizes the indirect recovery and reuse of building exhaust energy, avoids the cross -contamination caused by building exhaust direct into air conditioning system.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery, and in particular to a building exhaust energy recovery and utilization system. Background Technology

[0002] Many buildings currently use centralized air conditioning for heating and cooling. The principle is to filter and mix outdoor fresh air and indoor return air, then heat or cool them before delivering them into the rooms to maintain a certain temperature and humidity, thus cooling or heating the rooms. In practical applications (especially in hospital buildings), some rooms have no windows or their windows cannot be opened, and some rooms have hygiene requirements. Therefore, mechanical exhaust fans need to be installed in these rooms to ensure ventilation. The temperature of the mechanical exhaust air is the same as the indoor temperature, containing a certain amount of energy. Recovering this energy can pre-cool or preheat the fresh air in the centralized air conditioning system. However, some exhaust air may contain pollutants. If this exhaust air is directly mixed and recovered with fresh air, the mixed air will be delivered to multiple rooms through the centralized air conditioning system, potentially contaminating the rooms and posing a safety hazard. Therefore, it is crucial to recover the energy contained in the exhaust air from centralized air conditioning rooms while ensuring safety. Summary of the Invention

[0003] In view of this, the present invention proposes a building exhaust energy recovery and utilization system, which can indirectly recover the building's exhaust energy through heat exchange, thereby realizing energy recovery and utilization and reducing building energy consumption.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The building exhaust energy recovery and utilization system of this utility model includes multiple exhaust units and an exhaust energy recovery and utilization unit. The exhaust unit includes an exhaust branch pipe installed in the room, a vertical exhaust shaft connected to the exhaust branch pipe, and an exhaust main pipe connected to the vertical exhaust shaft. The exhaust main pipe is equipped with an exhaust valve, a heat exchanger, and an exhaust fan. The exhaust branch pipe is equipped with an indoor exhaust outlet or an exhaust fan, and a normally open fire damper is installed between the exhaust branch pipe and the vertical exhaust shaft.

[0006] The exhaust energy recovery and utilization unit includes a main liquid supply pipeline and a main liquid return pipeline. The heat exchanger is connected to the main liquid supply pipeline through a first liquid supply branch pipe, and a first manual valve is provided on the first liquid supply branch pipe. Each heat exchanger is connected to the main liquid return pipeline through a first liquid return branch pipe, and a second manual valve is provided on each first liquid return branch pipe.

[0007] The exhaust energy recovery unit also includes a booster pump assembly, which includes a circulation pump installed on the main liquid supply pipeline and a third manual valve and a fourth manual valve located on both sides of the circulation pump. A first check valve is installed on the outlet side of the circulation pump. The unit also includes a first pressure sensor and a first temperature sensor installed on the main liquid supply pipeline. The booster pump assembly also includes a fifth manual valve, a sixth manual valve, a second pressure sensor, and a second temperature sensor installed on the main liquid return pipeline.

[0008] The exhaust energy recovery unit also includes a second return liquid branch pipe and a second supply liquid branch pipe. The main return liquid pipeline is connected to the recovery section of the central air conditioning system through the second return liquid branch pipe, and a seventh manual valve is installed on the second return liquid branch pipe. The seventh manual valve is a normally open valve. The main supply liquid pipeline is connected to the recovery section through the second supply liquid branch pipe, and an electric valve is installed on the second supply liquid branch pipe.

[0009] The beneficial effects are: the exhaust energy recovery and utilization unit of this utility model is a closed loop, which can indirectly recover the heat or cold in the building exhaust air through heat exchange, and can exchange heat with the heat exchange device in the recovery section of the air conditioning system, thereby transferring the heat or cold to the air conditioning system, realizing the indirect recovery and reuse of the building exhaust energy, and avoiding cross-contamination caused by the direct entry of the building exhaust air into the air conditioning system.

[0010] Preferably, the exhaust unit further includes a filter device disposed at the upstream end of the main exhaust pipe. For rooms with indoor pollutants, installing a filter device on the main exhaust pipe of the corresponding vertical exhaust shaft can filter the exhaust air, reduce the impact on the external environment, and protect the environment.

[0011] Preferably, this invention also includes a control system, wherein the signal output terminals of the first pressure sensor, the first temperature sensor, the second pressure sensor, and the second temperature sensor are all connected to the signal input terminal of the control system, and the control input terminal of each electric valve and the circulating pump is connected to the control output terminal of the control system. In actual operation, the control system can monitor the return liquid temperature and the supply liquid temperature, the flow rate of the circulating pump, and the opening and closing of the electric valves, thereby achieving automatic recovery and utilization of exhaust heat or cold.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] The exhaust energy recovery and utilization unit of this utility model is a closed loop circuit. It can indirectly recover heat or cold energy from building exhaust air through heat exchange, and can exchange heat with the heat exchange device in the recovery section of the air conditioning system, thereby transferring heat or cold energy to the air conditioning system. This realizes the indirect recovery and reuse of building exhaust energy. On the one hand, it can avoid cross-contamination caused by building exhaust air directly entering the air conditioning system, and on the other hand, it can reduce building energy consumption, save energy and reduce emissions, and be green and environmentally friendly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the present invention.

[0015] Figure 2 This is a circuit block diagram of this utility model. Detailed Implementation

[0016] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0017] It should be noted that in the description of this utility model, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0018] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] like Figure 1As shown, this utility model proposes a building exhaust energy recovery and utilization system, including an exhaust unit 100 and an exhaust energy recovery and utilization unit. The exhaust unit includes exhaust branch pipes (usually multiple exhaust branch pipes) installed in the room, a vertical exhaust shaft 101 (located in the building) connected to the exhaust branch pipes, and an exhaust main pipe 102 connected to the vertical exhaust shaft 101. The exhaust main pipe 102 is equipped with an exhaust damper 103, a heat exchanger 104, and an exhaust fan 105. The exhaust branch pipes (horizontally installed in the room) are... The room is equipped with an indoor exhaust vent (which can be a louvered exhaust vent) or an exhaust fan (one or more exhaust fans can be installed in rooms where exhaust vents cannot be installed) to meet the room's mechanical ventilation needs. The exhaust unit 100, except for the exhaust branch pipe and the vertical exhaust shaft 101, is installed horizontally on the roof of the building for easy centralized maintenance. The exhaust valve 103 is an electric valve for easy control. The heat exchanger 104 and the exhaust fan 105 can be separate structures or integrated heat recovery equipment.

[0020] The exhaust energy recovery and utilization unit includes a main liquid supply pipeline 201 and a main liquid return pipeline 202. The heat exchanger 104 is connected to the main liquid supply pipeline 201 through a first liquid supply branch pipe 203, and a first manual valve F1 is installed on the first liquid supply branch pipe 203. The heat exchanger 104 of each exhaust unit is connected to the main liquid return pipeline 202 through a first liquid return branch pipe 204, and a second manual valve F2 is installed on each first liquid return branch pipe 204. During operation, the first manual valve F1 and the second manual valve F2 are normally open valves. The main liquid supply pipeline 201 enters the heat exchanger 104 of each exhaust unit through multiple first liquid supply branch pipes 203. After absorbing exhaust energy, it flows back to the main liquid return pipeline 202 through multiple first liquid return branch pipes 204. The circulating medium (preferably ethylene glycol) after absorbing energy can enter the air conditioning system 300 through the main liquid return pipeline 202, that is, the main liquid return pipeline 202 is connected to the inlet of the recovery section of the air conditioning system 300.

[0021] The exhaust energy recovery unit also includes a booster pump group (i.e., a circulation pump group). The booster pump group includes a circulation pump P installed on the main liquid supply line 201 and a third manual valve F3 and a fourth manual valve F4 located on both sides of the circulation pump P. The third manual valve F3 and the fourth manual valve F4 are normally open valves. A first check valve 205 is installed on the outlet side of the circulation pump P. A first pressure sensor and a first temperature sensor are also installed on the main liquid supply line 201 to monitor the pressure and temperature of the main liquid supply line 201, respectively. The booster pump group also includes a fifth manual valve F5, a sixth manual valve F6, a second pressure sensor, and a second temperature sensor installed on the main liquid return line 202 to monitor the pressure and temperature of the main liquid return line 202.

[0022] The exhaust energy recovery unit also includes a second return liquid branch pipe 206 and a second supply liquid branch pipe 207. The main return liquid pipeline 202 is connected to the recovery section of the central air conditioning system 300 through the second return liquid branch pipe 206, and a seventh manual valve F7 is installed on the second return liquid branch pipe 206. The seventh manual valve F7 is a normally open valve. The main supply liquid pipeline 201 is connected to the recovery section through the second supply liquid branch pipe 207, and an electric valve 208 is installed on the second supply liquid branch pipe 207. In actual operation, the circulation pump P provides circulation power, so that the circulating medium after absorbing energy enters the recovery section under the action of the circulation pump P, and then flows back to the main return liquid pipeline 202 through the recovery section (which has a built-in heat exchanger, which can be a coil heat exchanger). It then enters each exhaust unit through the main return liquid pipeline 202 to absorb heat. This cycle continues, absorbing the building's exhaust energy and using it for the central air conditioning system 300, thereby realizing the indirect recovery and utilization of the building's exhaust energy, saving energy, reducing emissions, and promoting low carbon emissions and environmental protection.

[0023] The exhaust energy recovery and utilization unit of this utility model is a closed loop. It can indirectly recover heat or cold from the building exhaust air through heat exchange, and perform heat exchange in the recovery section 301 of the central air conditioning system 300 to transfer heat or cold to the central air conditioning system 300. This realizes the indirect recovery and reuse of building exhaust energy and avoids cross-contamination caused by the direct entry of building exhaust air into the central air conditioning system 300.

[0024] In actual installation, for rooms with pollutants, a filter device is installed on the exhaust duct 102 of the corresponding exhaust unit. The exhaust fan 105 provides exhaust power, and the filter device filters the exhaust air to reduce the impact of indoor pollutant-laden air on the external environment and protect the environment.

[0025] This utility model also includes a control system. The signal output terminals of the first pressure sensor, the first temperature sensor, the second pressure sensor, and the second temperature sensor are all connected to the signal input terminal of the control system. The control input terminal of each of the electric valves 208 and the circulating pump P is connected to the control output terminal of the control system. In actual operation, the control system can monitor the return liquid temperature and the supply liquid temperature, the flow rate of the circulating pump P, and the opening and closing of the electric valves 208, thereby realizing the automatic recovery and utilization of exhaust heat or cold energy. See details below. Figure 2 .

[0026] It should be noted that the controller of the control system in this utility model is preferably a PLC controller, but it can also be a general-purpose processor, a special-purpose processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) circuit, or any other type of integrated circuit (IC). Furthermore, the controller can also be equipped with a wireless communication module to connect with a remote terminal, receive control commands from the remote terminal, and provide feedback on relevant parameters of the real-time operating status.

[0027] When cooling (exhaust air temperature is lower than outdoor ambient temperature during the heating season) or heating (exhaust air temperature is higher than outdoor ambient temperature during the heating season), the exhaust unit's fan and booster pump are started, and the electric air valve and electric valve are opened. Indoor air flows through the exhaust branch pipes to the vertical exhaust shaft 101, and then enters the heat exchanger 104 (or enters the heat exchanger 104 after filtration) to exchange heat with the circulating medium. After heat exchange, the exhaust air is discharged by the exhaust fan. The circulating medium, after absorbing energy, enters the recovery section of the air conditioning system on each floor under the action of the booster pump. In the recovery section, it transfers energy to the air conditioning system 300 through heat exchange, thereby achieving pre-cooling or waste heat of fresh air. After heat exchange at the air conditioning system 300, the circulating medium flows back to the exhaust unit. This cycle is repeated to realize the recovery and utilization of exhaust air energy, which helps to reduce the building's energy consumption and is environmentally friendly.

[0028] During the transitional season, this invention can be used to supply air to the central air conditioning system, which then delivers the supply air and fresh outdoor air into the rooms. Alternatively, during the transitional season, this invention can be left unused, and the central air conditioning system can be used alone to supply fresh air to each room.

[0029] Finally, it should be emphasized that the above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A building exhaust ventilation energy recovery and utilization system, comprising multiple exhaust ventilation units, characterized in that: It also includes an exhaust energy recovery and utilization unit, wherein the exhaust unit includes an exhaust branch pipe installed in the room, a vertical exhaust shaft connected to the exhaust branch pipe, and an exhaust main pipe connected to the vertical exhaust shaft. The exhaust main pipe is equipped with an exhaust damper, a heat exchanger and an exhaust fan. The exhaust branch pipe is equipped with an indoor exhaust outlet or an exhaust fan, and a normally open fire damper is installed between the exhaust branch pipe and the vertical exhaust shaft. The exhaust energy recovery and utilization unit includes a main liquid supply pipeline and a main liquid return pipeline. The heat exchanger is connected to the main liquid supply pipeline through a first liquid supply branch pipe, and a first manual valve is provided on the first liquid supply branch pipe. Each heat exchanger is connected to the main liquid return pipeline through a first liquid return branch pipe, and a second manual valve is provided on each first liquid return branch pipe. The exhaust energy recovery unit also includes a booster pump assembly, which includes a circulation pump installed on the main liquid supply pipeline and a third manual valve and a fourth manual valve located on both sides of the circulation pump. A first check valve is installed on the outlet side of the circulation pump. The unit also includes a first pressure sensor and a first temperature sensor installed on the main liquid supply pipeline. The booster pump assembly also includes a fifth manual valve, a sixth manual valve, a second pressure sensor, and a second temperature sensor installed on the main liquid return pipeline. The exhaust energy recovery unit also includes a second return liquid branch pipe and a second supply liquid branch pipe. The main return liquid pipeline is connected to the recovery section of the central air conditioning system through the second return liquid branch pipe, and a seventh manual valve is installed on the second return liquid branch pipe. The seventh manual valve is a normally open valve. The main supply liquid pipeline is connected to the recovery section through the second supply liquid branch pipe, and an electric valve is installed on the second supply liquid branch pipe.

2. The building exhaust energy recovery and utilization system according to claim 1, characterized in that: The exhaust unit also includes a filter device located at the upstream end of the exhaust main pipe.

3. The building exhaust energy recovery and utilization system according to claim 1, characterized in that: It also includes a control system, wherein the signal output terminals of the first pressure sensor, the first temperature sensor, the second pressure sensor, and the second temperature sensor are all connected to the signal input terminal of the control system, and the control input terminal of each of the electric valves and the circulating pump is connected to the control output terminal of the control system.

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