Combined air conditioning unit energy saving system

Abstract

The utility model belongs to air conditioning technical field, concretely is a combined air conditioning unit energy -conserving system, include: combined air conditioning unit, main refrigerating unit, ground source heat pump system, pre -cooling function section and intelligent control unit, the combined air conditioning unit is by the air intake box, coarse -effect filter section, pre -table cooling section, return air section, table cooling section, heating section, humidification section, medium -effect filter section and air supply fan section that set up in proper order from the progress, the utility model discloses a pre -cooling function section is set up independently in the fresh air passage of combined air conditioning unit, is located the original table cooling section upstream, and is connected with ground source heat pump system through first pipeline and second pipeline, has played the role of using low -grade ground source cold source to carry out primary pre -cooling and pre -dehumidification to high temperature and high humidity fresh air, has reached the effect that the load of subsequent main refrigerating unit and table cooling section is reduced greatly, significantly reduces the overall energy consumption of system.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, specifically to an energy-saving system for a combined air conditioning unit. Background Technology

[0002] Biopharmaceutical companies need to operate in a clean environment with constant temperature and humidity, and typically rely on combined air conditioning units to maintain environmental parameters. These units usually include a fresh air section, a primary filtration section, a preheating section, a return air section, a cooling surface section, a heating section, a humidification section, a supply air section, and a medium-efficiency filtration section.

[0003] In high-temperature summer environments, maintaining a constant indoor temperature requires cooling the hot fresh air through a surface cooling section. Traditionally, water-cooled chillers provide the cooling source; the higher the fresh air temperature and the larger the air volume, the greater the required chiller power, resulting in significantly increased energy consumption. Although ground source heat pumps are used for heating in winter, their summer cooling potential is not fully utilized, leading to energy waste.

[0004] Therefore, existing technologies suffer from problems such as high energy consumption, high operating costs, and low energy utilization, and there is an urgent need for an energy-efficient and high-performance air conditioning system optimization solution. Utility Model Content

[0005] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted by this utility model is as follows:

[0007] A modular air conditioning unit energy-saving system includes: a modular air conditioning unit, a main refrigeration unit, a ground source heat pump system, a pre-cooling functional section, and an intelligent control unit;

[0008] The combined air conditioning unit is arranged in the following order from inlet to outlet: air inlet box, coarse filter section, pre-cooling section, return air section, surface cooling section, heating section, humidification section, medium-efficiency filter section and air supply fan section.

[0009] The pre-cooling section is located within the pre-cooling section of the combined air conditioning unit.

[0010] The inlet of the precooling section is connected to the chilled water outlet of the ground source heat pump system through a first pipeline, and its outlet is connected to the return water outlet of the ground source heat pump system through a second pipeline, thus forming a precooling circulation loop.

[0011] The inlet of the surface cooling section is connected to the outlet of the main refrigeration unit through a third pipeline, and its outlet is connected to the return end of the main refrigeration unit through a fourth pipeline, thus forming the main cooling cycle loop.

[0012] The signal input terminal of the intelligent control unit is communicatively connected to the first temperature and humidity sensor installed in the air inlet box and the second temperature and humidity sensor installed at the air outlet of the pre-cooling functional section, respectively. The control output terminal of the intelligent control unit is communicatively connected to the electric regulating valve installed on the first pipeline.

[0013] In a preferred embodiment, the present invention can be further configured such that the pre-cooling functional section includes:

[0014] The housing has flange interfaces at both ends that match the air duct of the air conditioning unit;

[0015] The finned tube heat exchanger is fixedly installed inside the shell, and its pipe interfaces constitute the inlet and outlet of the precooling functional section.

[0016] A baffle plate is provided on the downstream side of the finned tube heat exchanger.

[0017] A condensate pan, located at the bottom of the housing, below the finned tube heat exchanger and the baffle plate, is used to collect condensate and has a drain outlet.

[0018] In a preferred embodiment, the present invention can be further configured such that the finned tube heat exchanger has a hydrophilic coating on its finned surface and its heat exchange tubes are made of copper.

[0019] In a preferred embodiment, the present invention can be further configured such that both the precooling circulation loop and the main cooling circulation loop are equipped with a circulating water pump and a shut-off valve.

[0020] In a preferred embodiment, the present invention can be further configured such that the intelligent control unit also includes an antifreeze protection module for preventing the precooling circulation loop from freezing, the antifreeze protection module including a temperature sensor installed at the fresh air inlet and a control loop linked to the electric regulating valve and the circulating water pump.

[0021] In a preferred embodiment, the present invention can be further configured such that the circulating water temperature provided by the ground source heat pump system is 10-15℃.

[0022] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0023] 1. This utility model sets up an independent pre-cooling functional section in the fresh air duct of the combined air conditioning unit, upstream of the original surface cooling section, and connects it to the ground source heat pump system through the first and second pipelines. This achieves the effect of using low-grade ground source cold source to perform primary pre-cooling and pre-dehumidification of high-temperature and high-humidity fresh air, thereby significantly reducing the load on the subsequent main refrigeration unit and surface cooling section, and significantly reducing the overall energy consumption of the system.

[0024] 2. This utility model, by sequentially arranging a finned tube heat exchanger, a baffle plate, and a condensate pan inside the shell of the pre-cooling functional section, achieves efficient air-water heat exchange, effectively prevents condensate droplets from being carried away by the airflow, and reliably collects and discharges condensate, thereby ensuring pre-cooling efficiency and protecting the downstream air conditioning unit functional section from moisture erosion.

[0025] 3. This utility model, by setting up a control architecture including an intelligent control unit, a first temperature and humidity sensor, a second temperature and humidity sensor, and an electric regulating valve, and by physically connecting the signal line to the control output terminal, plays the role of real-time monitoring of air parameters and automatic adjustment of the chilled water flow on the ground source side, thereby achieving the effect of stabilizing the air parameters after pre-cooling within the set range and realizing the automated, efficient and energy-saving operation of the system.

[0026] 4. This utility model, by setting an antifreeze protection module containing a temperature sensor and its linkage structure with the electric regulating valve and circulating water pump, plays the role of automatically activating the antifreeze protection program in low-temperature environments, thereby preventing the water in the pre-cooling circulation loop from freezing and cracking the pipes and equipment, and ensuring the safe and reliable operation of the system under various climatic conditions throughout the year. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the combined air conditioning unit energy-saving system of this utility model;

[0028] Figure 2 This is a schematic diagram of the pre-cooling functional section structure of this utility model.

[0029] Figure label:

[0030] 1. Combined air conditioning unit; 2. Main refrigeration unit; 3. Ground source heat pump system; 4. Shut-off valve; 5. Circulating water pump; 6. First pipeline; 7. Second pipeline; 8. Third pipeline; 9. Fourth pipeline; 10. Pre-cooling section; 101. Shell; 102. Finned tube heat exchanger; 103. Baffle plate; 104. Condensate tray; 11. Cooling section; 12. Intelligent control unit; 13. First temperature and humidity sensor; 14. Second temperature and humidity sensor; 15. Electric regulating valve. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0032] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0033] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing an energy-saving system for a combined air conditioning unit.

[0034] Combination Figures 1-2 As shown, the present invention provides a modular air conditioning unit energy-saving system, comprising: a modular air conditioning unit 1, a main refrigeration unit 2, a ground source heat pump system 3, a pre-cooling functional section 10, and an intelligent control unit 12.

[0035] Specifically, the combined air conditioning unit 1 is provided with an air inlet box, a coarse filter section, a pre-cooling section, a return air section, a surface cooling section 11, a heating section, a humidification section, a medium-efficiency filter section, and a blower section in sequence from inlet to outlet; the pre-cooling function section 10 is located in the pre-cooling section of the combined air conditioning unit 1.

[0036] The inlet of the precooling functional section 10 is connected to the chilled water outlet of the ground source heat pump system 3 through the first pipe 6, and its outlet is connected to the return water outlet of the ground source heat pump system 3 through the second pipe 7, thus forming a precooling circulation loop.

[0037] The inlet of the surface cooling section 11 is connected to the outlet of the main refrigeration unit 2 through the third pipe 8, and its outlet is connected to the return end of the main refrigeration unit 2 through the fourth pipe 9, forming the main cooling cycle loop.

[0038] The signal input terminal of the intelligent control unit 12 is communicatively connected to the first temperature and humidity sensor 13 installed in the air inlet box and the second temperature and humidity sensor 14 installed at the air outlet of the pre-cooling functional section 10, respectively. The control output terminal of the intelligent control unit 12 is communicatively connected to the electric regulating valve 15 installed on the first pipeline 6.

[0039] In the above scheme, the core of the pre-cooling energy-saving system lies in the addition of a pre-cooling functional section 10 and its integration into the existing system. The pre-cooling functional section 10 is seamlessly embedded in the fresh air duct of the combined air conditioning unit 1 through flanges at both ends. Physically, it is located after the primary filter section and before the original surface cooling section 11. Its water circuit is connected in parallel or in series with the original pipeline of the ground source heat pump system 3 through the first pipeline 6 and the second pipeline 7 to form an independent pre-cooling circulation loop. The original main refrigeration unit 2 and surface cooling section 11 loop remain unchanged. The intelligent control unit 12, such as a PLC or DDC controller, is connected to the fresh air inlet and the pre-cooling section outlet through signal lines to collect temperature and humidity signals. Its control line is connected to the electric regulating valve 15 installed on the first pipeline 6 to output control signals. This structure realizes the use of ground source cold source to pre-cool the fresh air in stages, which is the basis for system energy saving.

[0040] Furthermore, the pre-cooling functional segment 10 includes:

[0041] The housing 101 has flange interfaces at both ends that match the air duct of the air conditioning unit;

[0042] The finned tube heat exchanger 102 is fixedly installed inside the shell 101, and its pipe interface constitutes the inlet and outlet of the precooling functional section 10.

[0043] A baffle plate 103 is disposed on the downstream side of the finned tube heat exchanger 102;

[0044] A condensate pan 104 is disposed at the bottom of the housing 101, below the finned tube heat exchanger 102 and the baffle plate 103, for collecting condensate and having a drain outlet.

[0045] This structural design ensures the integrity, efficiency, and reliability of the precooling function.

[0046] Furthermore, the finned tube heat exchanger 102 has a hydrophilic coating on its fin surface and copper tubes for heat exchange. This structure can effectively improve heat exchange efficiency and make the condensate spread into a water film rather than water droplets on the fins, thereby reducing wind resistance and facilitating rapid flow down, avoiding airflow loss and the risk of bacterial growth caused by water accumulation.

[0047] Furthermore, both the precooling circulation loop and the main cooling circulation loop are equipped with a circulating water pump 5 and a shut-off valve 4. These components are necessary structures to ensure that the two circulation loops can operate independently and normally.

[0048] Furthermore, the intelligent control unit 12 also includes an antifreeze protection module for preventing the precooling circulation loop from freezing. The antifreeze protection module includes a temperature sensor installed at the fresh air inlet and a control loop linked with the electric regulating valve 15 and the circulating water pump 5. The antifreeze protection module is part of the function of the intelligent control unit 12. Its hardware basis is the newly added temperature sensor, or directly utilizes the temperature signal of the first temperature and humidity sensor 13, as well as the control loop with the electric regulating valve 15 and the circulating water pump 5.

[0049] When the sensor detects a low temperature signal, the control unit will issue a command through the control circuit connected by this hard wire to close the electric regulating valve 15 and stop the circulating water pump 5, thereby cutting off the water circulation and preventing the stagnant water from freezing in the coil. This is an automatic protection structure implemented through hardware connection.

[0050] Furthermore, the circulating water temperature provided by the ground source heat pump system 3 is 10-15℃. This stable low-temperature cold source is the premise and guarantee for the present invention to efficiently implement precooling and achieve significant energy-saving effects.

[0051] The automated workflow of the pre-cooling energy-saving system described in this utility model is as follows: its operating mode is mainly switched by the intelligent control unit 12 according to environmental parameters:

[0052] 1. Summer cooling mode (pre-cooling function enabled):

[0053] Step 1: Monitoring and Judgment. The intelligent control unit 12 continuously monitors the parameters of the first temperature and humidity sensor 13 for fresh air and the second temperature and humidity sensor 14 for return air, and calculates the enthalpy value of the fresh air. When it is determined that the outdoor air enthalpy value is much higher than the indoor air value, and that activating pre-cooling has significant energy-saving benefits, proceed to the next step.

[0054] Step 2: Start the precooling circuit. The control unit starts the ground source heat pump system 3 and the circulating water pump 5, and opens the electric regulating valve 15.

[0055] Step 3: Primary precooling. Low-temperature chilled water, approximately 10-15°C, provided by the ground source heat pump flows into the finned tube heat exchanger 102 of the precooling functional section 10. The high-temperature fresh air is cooled and dehumidified as it passes through the heat exchanger, and some of the condensate is collected and discharged by the condensate pan 104. The temperature of the fresh air is significantly reduced after precooling.

[0056] Step 4: Secondary fine cooling. The pre-cooled fresh air continues to flow through the original surface cooling section 11. At this time, the main refrigeration unit 2 only needs to provide a small amount of cooling capacity to easily process the fresh air to the required air supply state point.

[0057] Step 5: Adjustment and stabilization. Based on the feedback from the second temperature and humidity sensor 14 at the pre-cooling section outlet, the control unit dynamically adjusts the opening of the electric regulating valve 15 to precisely control the amount of chilled water, ensuring stable pre-cooling effect and maximizing energy efficiency.

[0058] 2. Transitional Season / Winter Mode (Pre-cooling function off):

[0059] Step 1: Determine to shut down. When the control unit detects that the outdoor fresh air enthalpy is low and pre-cooling by the ground source heat pump is unnecessary or impossible, the pre-cooling circuit will remain in the off state.

[0060] Step 2: Traditional mode operation. The system reverts to the traditional operation mode of a combined air conditioning unit, with only the main refrigeration unit 2 or the original functional section such as the heating section completing the air handling task.

[0061] 3. Winter antifreeze protection mode:

[0062] Step 1: Low temperature monitoring. When the second temperature and humidity sensor 14 installed at the fresh air inlet detects that the ambient temperature is lower than the safe setting value (e.g., ≤5℃), the anti-freeze protection program is activated.

[0063] Step Two: The protection control unit immediately closes the electric regulating valve 15 and stops the circulating water pump 5, cutting off the water flow to the pre-cooling circuit. Simultaneously, an alarm may be triggered to prompt management personnel to perform possible pipeline purging operations, thoroughly preventing coils and pipes from freezing and cracking due to stagnant water.

[0064] The terms "fixed," "installed," "connected," "set up," "open," "equipped with," "embedded," and "assembled" used in this manual to describe the position or relationship of components all refer to conventional physical connections or spatial configurations that can be understood and implemented by those skilled in the art based on the function of the relevant components, the context, and common knowledge. These relationships encompass, but are not limited to, specific forms such as welding, bonding, threaded fastening, snap-fit, interference fit, plug-in, sliding fit, hinge, integral molding, adjacent arrangement, and opening or slot accommodating. Their purpose is to clearly describe the relative positions, mating methods, and functional implementation paths between components, rather than limiting a single specific structural detail. To ensure a smooth and concise reading experience and ease of understanding, no separate explanation is provided after each term.

[0065] Although embodiments of the present 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 present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy-saving system for a combined air conditioning unit, characterized in that, include: Combined air conditioning unit (1), main refrigeration unit (2), ground source heat pump system (3), pre-cooling functional section (10) and intelligent control unit (12); The combined air conditioning unit (1) is provided with an air inlet box, a coarse filter section, a pre-cooling section, a return air section, a cooling section (11), a heating section, a humidification section, a medium-efficiency filter section and a blower section in sequence from inlet to outlet. The pre-cooling section (10) is located within the pre-cooling section of the combined air conditioning unit (1); The inlet of the precooling functional section (10) is connected to the chilled water outlet of the ground source heat pump system (3) through the first pipeline (6), and its outlet is connected to the return water outlet of the ground source heat pump system (3) through the second pipeline (7), thus forming a precooling circulation loop. The inlet of the surface cooling section (11) is connected to the outlet of the main refrigeration unit (2) through the third pipe (8), and its outlet is connected to the return end of the main refrigeration unit (2) through the fourth pipe (9), forming the main cooling cycle loop. The signal input terminal of the intelligent control unit (12) is connected to the first temperature and humidity sensor (13) installed in the air inlet box and the second temperature and humidity sensor (14) installed at the air outlet of the pre-cooling function section (10). The control output terminal of the intelligent control unit (12) is connected to the electric regulating valve (15) installed on the first pipeline (6).

2. The energy-saving system for a combined air conditioning unit according to claim 1, characterized in that, The precooling function section (10) includes: The housing (101) has flange interfaces at both ends that match the air duct of the air conditioning unit; The finned tube heat exchanger (102) is fixedly installed inside the shell (101), and its pipe interface constitutes the inlet and outlet of the precooling functional section (10). A baffle plate (103) is provided on the downstream side of the finned tube heat exchanger (102); A condensate tray (104) is disposed at the bottom of the housing (101), below the finned tube heat exchanger (102) and the baffle plate (103), for collecting condensate and having a drain outlet.

3. The energy-saving system for a combined air conditioning unit according to claim 2, characterized in that, The finned tube heat exchanger (102) has a hydrophilic coating on its fin surface and its heat exchange tubes are made of copper.

4. The energy-saving system for a combined air conditioning unit according to claim 1, characterized in that, Both the precooling circulation loop and the main cooling circulation loop are equipped with a circulating water pump (5) and a shut-off valve (4).

5. The energy-saving system for a combined air conditioning unit according to claim 4, characterized in that, The intelligent control unit (12) also includes an antifreeze protection module for preventing the precooling circulation loop from freezing. The antifreeze protection module includes a temperature sensor installed at the fresh air inlet and a control loop that is linked to the electric regulating valve (15) and the circulating water pump (5).

6. The combined air conditioning unit energy-saving system according to any one of claims 1-5, characterized in that, The circulating water temperature provided by the ground source heat pump system (3) is 10-15℃.

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