CN113970127A

CN113970127A - Environment optimization system

Info

Publication number: CN113970127A
Application number: CN202010711984.XA
Authority: CN
Inventors: 陈晓宁; 杨春; 束宏飞
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2022-01-25

Abstract

The invention relates to an environment optimization system, which is suitable for temperature and humidity regulation of a preset space and comprises: an outdoor unit including a compressor adapted to compress a first working fluid to form a portion of a first working fluid circuit; and indoor devices, at least two of which are connected in parallel with each other, the indoor devices being separately provided with respect to the outdoor device, respectively, and the indoor devices including a first working fluid heat exchanger and a second working fluid heat exchanger, the first working fluid heat exchanger being associated with the compressor so as to also form a part of the first working fluid circuit, the second working fluid heat exchanger forming a part of the second working fluid circuit. The environment optimizing system of the invention can reduce load and noise, improve dehumidification efficiency and adjusting capacity, and improve the structural design of the indoor device to improve the adjusting capacity of the unit and the load and expand the application range of the environment optimizing system.

Description

Environment optimization system

Technical Field

The present invention relates to the field of air conditioning heating and ventilation, and more particularly to an environmental optimization system that improves on the regulation of the temperature and humidity of a predetermined space.

Background

Currently, there are environmental optimization systems for regulating the temperature, humidity and cleanliness of air in a predetermined space (e.g., an indoor space). The environment optimization system comprises, for example, an air conditioning system for cooling and/or heating, a fresh air system for providing fresh air, or a combination thereof.

First, in the current environment optimization system, only an air conditioning (cooling/heating) system is provided without a fresh air system, so that independent control of temperature and humidity cannot be realized mainly by temperature control, which results in poor humidity regulation (insufficient dehumidification or excessive dehumidification). Moreover, dehumidification by the air conditioning system itself causes a drop in indoor temperature, which gives users a feeling of discomfort of cold and cloudy, and the condensate water dehumidified at the indoor end is also prone to bacteria growth. Moreover, the absence of a fresh air system also leads to poor indoor air quality and reduced oxygen content.

Secondly, in the current environment optimization system, it has also been proposed to additionally adopt a fresh air system on the basis of the air conditioning system. For example, ceiling-mounted independent fresh air dehumidifiers are increasingly being used in air conditioning heating and ventilation systems. The traditional ceiling type independent fresh air dehumidifier is an integral structure in which a refrigeration cycle mechanism and a fresh air supply mechanism are all placed in a case. Under the action of the fan, the fresh air and the return air are mixed, cooled and dehumidified by the evaporator, reheated by the condenser and sent into an indoor room, and therefore the purposes of introducing the fresh air and dehumidifying the indoor air are achieved. However, this conventional structure has some drawbacks: the economical efficiency is poor, the load is increased by the integral structure, the power consumption of the refrigeration equipment is increased, and the comprehensive energy efficiency of the whole system is reduced; the dehumidification capacity is limited, the air temperature at the inlet of the evaporator is high, and the evaporation temperature is high; the comfort is poor, the energy regulating capability of the system is poor, and the air outlet state and the indoor state are difficult to control well; the noise is high, and the compressor runs indoors, so that the noise is increased; the function is single, and achievable mode of operation is few, can not satisfy more operating mode demands with the cooperation of heat supply cooling equipment, especially, under the general requirement that lasts the new trend, two kinds of functional modes of new trend or new trend + dehumidification + heating can only be realized to this system.

In summary, there is room and a need in the art for an environmentally optimized system that has high overall structural loads, low dehumidification efficiency, poor conditioning capability, high noise, and few functional modes.

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Disclosure of Invention

This summary is provided to introduce a general summary of the invention, not a full disclosure of the full scope of the invention or all of the features of the invention.

It is an object of the present invention to provide an environment optimization system that reduces load and noise, improves dehumidification efficiency and conditioning capacity.

Another object of the present invention is to provide an environment optimization system having a dual-source parallel structure and capable of increasing the adjustment capability of the unit and load and expanding the application range by improving the structural design of the indoor device.

To achieve one or more of the above objects, according to the present invention, there is provided an environment optimization system adapted to perform temperature and humidity regulation of a predetermined space and including: an outdoor unit including a compressor adapted to compress a first working fluid forming part of a first working fluid circuit; and indoor devices, at least two of which are connected in parallel to each other, the indoor devices being separately provided with respect to the outdoor device, respectively, the indoor devices including a first working fluid heat exchanger and a second working fluid heat exchanger, the first working fluid heat exchanger being associated with the compressor so as to also form a part of the first working fluid circuit, the second working fluid heat exchanger forming a part of the second working fluid circuit.

Advantageously, the environment optimisation system is configured to be able to selectively activate one or both of the first and second working fluid heat exchangers.

Advantageously, the environment optimization system comprises a four-way valve provided in the outdoor unit, the first working fluid circuit being switchable between a cooling mode and a heating mode by switching the four-way valve; and/or the second working fluid circuit is configured to be switchable between the second working fluid heat exchanger being adapted to cool and heat fresh air.

Advantageously, the first working fluid heat exchanger comprises a first heat exchanger and a second heat exchanger in series.

Advantageously, a first expansion valve and a first shut-off valve in parallel are provided at a first end of the second heat exchanger and a second expansion valve and a second shut-off valve in parallel are provided at a second end of the second heat exchanger.

Advantageously, the indoor device is configured such that fresh air flows sequentially through the second working fluid heat exchanger, the first heat exchanger and the second heat exchanger.

Advantageously, the outdoor unit comprises an outdoor heat exchanger and the environment optimisation system is configured such that:

the outdoor heat exchanger is used as an upstream condenser, the second heat exchanger is used as a downstream condenser so as to form a reheating section of the indoor device, which is suitable for reheating fresh air, and the first heat exchanger is used as an evaporator so as to form a dehumidifying section of the indoor device, which is suitable for dehumidifying fresh air, so that a refrigerating, dehumidifying and reheating mode of the environment optimization system is realized; or the outdoor heat exchanger is used as a condenser, the second heat exchanger is used as an upstream evaporator so as to form a first dehumidification section of the indoor device, which is suitable for dehumidifying fresh air, and the first heat exchanger is used as a downstream evaporator so as to form a second dehumidification section of the indoor device, which is suitable for dehumidifying fresh air, so that a refrigeration deep dehumidification mode of the environment optimization system is realized; or the outdoor heat exchanger is used as an evaporator, the first heat exchanger is used as an upstream condenser so as to form a first heating section of the indoor device for heating fresh air, and the second heat exchanger is used as a downstream condenser so as to form a second heating section of the indoor device for heating fresh air, so that the heating mode of the environment optimization system is realized; or the outdoor heat exchanger is used as a downstream evaporator, the first heat exchanger of the indoor device is used as a condenser so as to form a heating section of the indoor device for heating fresh air, and the second heat exchanger is used as an upstream evaporator so as to form a drying section of the indoor device for dehumidifying fresh air, so that the heating and drying mode of the environment optimization system is realized.

Advantageously, the outdoor unit comprises a fan for the outdoor heat exchanger, and the environment optimization system is configured to adjust the amount of reheating of the second heat exchanger for reheating fresh air when used as the reheating section by adjusting the speed of the fan.

Advantageously, the environment optimisation system is configured to adjust the amount of heating the first and second heat exchangers heat the fresh air when used as the heating section by adjusting the rotational speed of the compressor.

Advantageously, the second working fluid circuit has water as the working fluid and an air, ground or refrigerant circuit source as the heat/cold source.

Advantageously, the outdoor unit comprises an economizer adapted to make up air for the compressor.

The invention has the beneficial effects that: an environment optimizing system is provided which reduces load and noise, improves dehumidification efficiency and conditioning capacity; and provides an environment optimizing system which has a double-source parallel structure and improves the structural design of indoor devices to improve the adjusting capability of units and loads and expand the application range.

Drawings

Features and advantages of embodiments of the present invention will become more readily appreciated from the following description with reference to the accompanying drawings, in which:

FIG. 1 illustrates an environment optimization system according to an exemplary embodiment of the present invention.

Detailed Description

The invention is described in detail below with the aid of exemplary embodiments with reference to the attached drawings. The following detailed description of the invention is merely for purposes of illustration and is in no way intended to limit the invention, its application, or uses.

First, an environment optimization system 100 according to an exemplary embodiment of the present invention is described with reference to fig. 1.

The environment optimization system 100 is adapted to perform temperature and humidity regulation on a predetermined space (e.g., an indoor space), and the environment optimization system 100 includes: an outdoor unit 200, the outdoor unit 200 comprising a single compressor 201, the compressor 201 being adapted to compress a first working fluid to form a portion of a first working fluid circuit; and two

indoor devices

310 and 320 connected in parallel to each other, and the two

indoor devices

310 and 320 are separately provided with respect to the outdoor device 200, respectively, and one of the indoor devices 310 includes first working

fluid heat exchangers

311 and 315 and a second working fluid heat exchanger 312, and the other indoor device 320 includes first working

fluid heat exchangers

321 and 325 and a second working fluid heat exchanger 322. It will be understood that the first and second working fluid heat exchangers refer to heat exchangers that use different sources of working fluid. The first working fluid heat exchanger of each indoor unit is associated with the compressor to also form part of the first working fluid circuit and the second working fluid heat exchanger of each indoor unit forms part of a second working fluid circuit, not shown. Wherein the first working fluid heat exchangers in the two indoor units are arranged in parallel with respect to the compressor 201 of the outdoor unit 200.

The present invention provides a split configuration of multiple indoor units with respect to a single outdoor unit and a single compressor, thereby reducing load and noise, improving dehumidification efficiency and conditioning capacity, as compared to prior art integrated environmental optimization systems. Meanwhile, the indoor device comprising the first working fluid heat exchanger and the second working fluid heat exchanger with double working fluid sources optimizes the structural design of the indoor unit, thereby improving the adjusting capacity of the unit and the load and expanding the application range. It will be appreciated by those skilled in the art that the number of indoor units connected in parallel may be set as desired, for example, more than two.

In one aspect of the embodiment, the second working

fluid heat exchangers

312 and 322 in the two

indoor devices

310, 320 may be disposed in parallel, further reducing the unit load and noise. And, one or both of the first and second working fluid heat exchangers can be selectively activated to achieve more different operating modes, see the description below in detail.

With further reference to fig. 1, the environmental optimization system 100 includes a four-way valve 202 disposed in the outdoor unit 200, and the first working fluid circuit is switchable between a cooling mode and a heating mode by switching the four-way valve 202. And/or the second working fluid circuit is configured to be switchable between a cooling mode in which the second working

fluid heat exchanger

312, 322 is adapted to cool fresh air and a heating mode in which the second working

fluid heat exchanger

312, 322 is adapted to heat fresh air.

Specifically, the first working fluid heat exchanger of the indoor device includes first and

second heat exchangers

311, 321, 315, 325 connected in series, a

first expansion valve

313, 323 and a first shut-off

valve

314, 324 connected in parallel are provided at a first end of the

second heat exchanger

315, 325, and a

second expansion valve

316, 326 and a second shut-off

valve

317, 327 connected in parallel are provided at a second end of the

second heat exchanger

315, 325. To effect switching of the operating modes of the first working fluid heat exchanger.

In the fresh air supply path, the

indoor devices

310, 320 are configured so as to sequentially flow through the second working

fluid heat exchangers

312, 322, the

first heat exchangers

311, 321, and the

second heat exchangers

315, 325. Advantageously, the

indoor units

310, 320 may be configured such that fresh air is first filtered through the

filters

318, 328. The outdoor unit 200 includes an outdoor heat exchanger 203 and a blower 206 for the outdoor heat exchanger 203. A number of modes of operation of the environment optimization system of the present invention are described below.

When the first working fluid circuit is in the cooling mode, the first working fluid flows through the compressor 201, the outdoor heat exchanger 203, the

second heat exchangers

315, 325 and the

first heat exchangers

311, 321 in sequence, so that the outdoor heat exchanger 203 functions as an upstream condenser, the

second heat exchangers

315, 325 function as a downstream condenser and the

first heat exchangers

311, 321 function as evaporators by closing the

first expansion valves

313, 323 and the

second cutoff valves

317, 327 and opening the

second expansion valves

316, 326 and the

first cutoff valves

314, 324.

The

first heat exchangers

311 and 321 are used as evaporators to dehumidify mixed air to form a dehumidification section of the indoor device suitable for dehumidifying fresh air, and the

second heat exchangers

315 and 325 are used as downstream condensers to reheat the mixed air passing through the

first heat exchangers

311 and 321 to form a reheating section of the indoor device suitable for reheating fresh air, so that the fresh air with too low temperature is prevented from entering the indoor space to cause discomfort to users. Meanwhile, the second heat exchanger as the reheating section utilizes the condensation waste heat, so that reheating energy is saved, the supercooling degree of the system is increased, and the dehumidification system is operated efficiently. This enables a cooling dehumidification reheat mode of an environmentally optimized system that is particularly useful in hot summer humid or in transitional seasons with dehumidification demand, small cold/heat conditioning loads.

Advantageously, the amount of reheating of the

second heat exchanger

315, 325 to reheat the fresh air when used as a reheating section is adjusted by adjusting the rotational speed of the fan 206 of the outdoor heat exchanger 203.

Further, the working fluid of the

first heat exchanger

311, 321 and the

second heat exchanger

315, 325 of the first working fluid heat exchanger is refrigerant. The second working fluid circuit has water as the working fluid and an air, ground or refrigerant circuit source as the heat/cold source. The working fluid source of the second working

fluid heat exchanger

312, 322 may be cold water, and the mixed air is cooled by the second working

fluid heat exchanger

312, 322 and then further dehumidified by the

first heat exchanger

311, 321. Thus, the second working

fluid heat exchangers

312, 322 are combined with the

first heat exchangers

311, 321 for dual cold source dehumidification of the mixed wind. This enables a fresh air + deep dehumidification mode of operation that is particularly suited to weather or building needs where the moisture load is very high. In addition, the temperature and humidity are uniformly controlled by mutually coordinating and assisting the fluid loop of the water source heat exchanger and the fluid loop of the refrigerant source heat exchanger, and the overall energy consumption and equipment cost can be reduced.

Further, when the above-described first working fluid circuit is in the cooling mode, the cooling depth mode of the environment optimizing system can be realized by opening the

first expansion valves

313, 323 and the

second stop valves

317, 327 and closing the

second expansion valves

316, 326 and the

first stop valves

314, 324 so that the outdoor heat exchanger 203 functions as a condenser, the

second heat exchangers

315, 325 function as upstream evaporators to constitute a first dehumidifying section of the indoor device adapted to dehumidify fresh air, and the

first heat exchangers

311, 321 function as downstream evaporators to constitute a second dehumidifying section of the indoor device adapted to dehumidify fresh air, so that the mixed air cooled and dehumidified by the first heat exchangers is cooled again by the second heat exchangers.

When the first working fluid circuit is in a heating mode, the first working fluid flows through the compressor 201, the

first heat exchangers

311, 321, the

second heat exchangers

315, 325 and the outdoor heat exchanger 203 in sequence, such that the

first heat exchangers

311, 321 function as upstream condensers to constitute a first heating section of the indoor devices that heats fresh air, the

second heat exchangers

315, 325 function as downstream condensers to constitute a second heating section of the indoor devices that heats fresh air, and the outdoor heat exchanger 203 functions as an evaporator by closing the

second expansion valves

316, 326 and the

first cutoff valves

314, 324 and opening the

first expansion valves

313, 323 and the

second cutoff valves

317, 327,

wherein the

main heat exchangers

311, 321 and the

second heat exchangers

315, 325, both being condensers, heat the mixed air to achieve a heating mode of the environment optimization system, which is particularly suitable for transition seasons with no dehumidification demand, small thermal load.

Advantageously, the compressor 201 is an inverter compressor, and when the first working fluid circuit is in the heating mode, the environment optimization system of the present invention adjusts the heating capacity of the

first heat exchanger

311, 321 and the

second heat exchanger

315, 325 for heating the fresh air when used as the heating section by adjusting the rotation speed of the compressor 201.

Further, when the first working fluid circuit is in the heating mode, the

first heat exchanger

311, 321 functions as a condenser to constitute a heating section of the indoor device that heats fresh air, the

second heat exchanger

315, 325 functions as an upstream evaporator to constitute a drying section of the indoor device that dehumidifies the fresh air, and the outdoor heat exchanger 203 functions as a downstream evaporator by opening the

second expansion valve

316, 326 and the

first cutoff valve

314, 324 and closing the

first expansion valve

313, 323 and the

second cutoff valve

317, 327, thereby implementing the heating and drying mode of the environment optimization system. In the heating mode, the mixed air heated by the

first heat exchangers

311 and 321 is properly cooled by the

second heat exchangers

315 and 325, so that the discomfort of the user caused by the overheated fresh air entering the indoor space is avoided, and the effects of proper dehumidification and drying are achieved.

In addition, the

indoor units

310 and 320 may further include

indoor fans

319 and 329, and in the case where only fresh air is required, the working fluid source of the second working

fluid heat exchangers

312 and 322 is cold water or hot water to pre-cool or pre-heat the mixed air sent by the

indoor fans

319 and 329.

In one aspect of an embodiment, the outdoor unit 200 includes an economizer 205 adapted to supplement the compressor 201, thereby supplementing the compressor 201 for heating in winter. Advantageously, the make-up gas may be opened by an expansion valve 204 in series with the economizer 205.

The invention is susceptible of various possible variations.

The cooling-heating working fluid circuit is described above, and the indoor unit is described above as being provided with a water source heat exchanger as a pre-cooling section, a refrigerant source heat exchanger as a dehumidifying section, and a reheat heat exchanger as a reheating section. However, it is contemplated that the heat exchange section for temperature and humidity regulation of fresh air in the indoor unit may be appropriately changed. For example, the pre-cooling section water source heat exchanger and/or the reheat section second heat exchanger may be omitted.

In addition, it should be noted that the technical features of the respective embodiments and their variants described above can be combined with one another as desired, unless technically incompatible therewith.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the specific embodiments described and illustrated in detail herein, and that various changes may be made to the exemplary embodiments by those skilled in the art without departing from the scope defined by the appended claims.

Claims

1. An environmental optimization system (100), the environmental optimization system (100) being adapted for temperature and humidity regulation of a predetermined space and comprising:

an outdoor unit (200), the outdoor unit (200) comprising a compressor (201), the compressor (201) being adapted to compress a first working fluid to form part of a first working fluid circuit; and an indoor device (310; 320),

characterized in that at least two of said indoor units (310; 320) are connected in parallel with each other, said indoor units (310; 320) being arranged separately with respect to said outdoor unit (200), respectively, said indoor units comprising a first working fluid heat exchanger (311, 315; 321, 325) and a second working fluid heat exchanger (312; 322), said first working fluid heat exchanger (311, 315; 321, 325) being associated with said compressor (201) so as to also form part of said first working fluid circuit, said second working fluid heat exchanger (312; 322) forming part of a second working fluid circuit.

2. The environment optimization system (100) of claim 1, wherein:

the environment optimization system (100) is configured to selectively enable one or both of the first working fluid heat exchanger (311, 315; 321, 325) and the second working fluid heat exchanger (312; 322).

3. The environment optimization system (100) of claim 1, wherein:

the environment optimization system (100) includes a four-way valve (202) disposed in the outdoor unit (200), the first working fluid circuit being switchable between a cooling mode and a heating mode by switching the four-way valve (202); and/or

The second working fluid circuit is configured to be switchable between the second working fluid heat exchanger (312; 322) being adapted to cool fresh air and heat fresh air.

4. The environment optimization system (100) according to any one of claims 1 to 3, wherein:

the first working fluid heat exchanger (311, 315; 321, 325) comprises a first heat exchanger (311; 321) and a second heat exchanger (315; 325) in series.

5. The environment optimization system (100) of claim 4, wherein: a first expansion valve (313; 323) and a first shut-off valve (314; 324) are arranged in parallel at a first end of the second heat exchanger (315; 325), and a second expansion valve (316; 326) and a second shut-off valve (317; 327) are arranged in parallel at a second end of the second heat exchanger (315; 325).

6. The environment optimization system (100) of claim 4, wherein:

the indoor device (310; 320) is configured such that fresh air flows sequentially through the second working fluid heat exchanger (312; 322), the first heat exchanger (311; 321), and the second heat exchanger (315; 325).

7. The environment optimization system (100) of claim 4, wherein:

the outdoor unit (200) comprises an outdoor heat exchanger (203), and

the environment optimization system (100) is configured such that:

the outdoor heat exchanger (203) is used as an upstream condenser, the second heat exchanger (315; 325) is used as a downstream condenser so as to form a reheating section of the indoor device, which is suitable for reheating fresh air, and the first heat exchanger (311; 321) is used as an evaporator so as to form a dehumidifying section of the indoor device, which is suitable for dehumidifying fresh air, so that a refrigerating, dehumidifying and reheating mode of the environment optimization system is realized; or

The outdoor heat exchanger (203) is used as a condenser, the second heat exchanger (315; 325) is used as an upstream evaporator so as to form a first dehumidification section of the indoor device, which is suitable for dehumidifying fresh air, and the first heat exchanger (311; 321) is used as a downstream evaporator so as to form a second dehumidification section of the indoor device, which is suitable for dehumidifying fresh air, so that a refrigeration deep dehumidification mode of the environment optimization system is realized; or

The outdoor heat exchanger (203) is used as an evaporator, the first heat exchanger (311; 321) is used as an upstream condenser so as to form a first heating section of the indoor device for heating fresh air, and the second heat exchanger (315; 325) is used as a downstream condenser so as to form a second heating section of the indoor device for heating fresh air, so that a heating mode of the environment optimization system is realized; or

The outdoor heat exchanger (203) is used as a downstream evaporator, the indoor device (310; 320) the first heat exchanger (311; 321) is used as a condenser to form a heating section of the indoor device for heating fresh air, and the second heat exchanger (315; 325) is used as an upstream evaporator to form a drying section of the indoor device for dehumidifying fresh air, thereby realizing a heating and drying mode of the environment optimization system.

8. The environment optimization system (100) of claim 7, wherein:

the outdoor unit (200) comprises a fan (206) for the outdoor heat exchanger (203), and the environment optimization system is configured to adjust the reheating amount of the second heat exchanger (315; 325) for reheating the fresh air when used as the reheating section by adjusting the rotation speed of the fan (206).

9. The environment optimization system (100) of claim 7, wherein:

the environment optimization system is configured to adjust the heating amount of the first heat exchanger (311; 321) and the second heat exchanger (315; 325) for heating fresh air when used as the heating section by adjusting the rotation speed of the compressor (201).

10. The environment optimization system (100) according to any one of claims 1 to 3, wherein:

the second working fluid circuit has water as the working fluid and an air, ground or refrigerant circuit source as the heat/cold source.

11. The environment optimization system (100) according to any one of claims 1 to 3, wherein:

the outdoor unit (200) comprises an economizer (205) adapted to make up air for the compressor (201).