Radiant coil and multi-split indoor unit co-association complementary air conditioning system

Abstract

The utility model discloses a kind of air conditioning systems of radiating coil and multi-connected indoor unit co-connection complementary, including cooling and heating circuit, its characterized is cooling circuit: compressor is through oil separator, four-way valve to outdoor unit heat exchanger, after being through first electronic expansion valve branch A, B two ways, A road is through multi-connected indoor unit and B road is through second electronic expansion valve and freon-water heat exchanger convergence to D road, connect back four-way valve, through gas-liquid separator to compressor suction port;Heating circuit is that compressor is through oil separator, four-way valve to D pipe branch two ways, one way is through multi-connected indoor unit and another way is through freon-water heat exchanger and second electronic expansion valve after convergence to A pipe again through first electronic expansion valve to outdoor unit heat exchanger, again through four-way valve, gas-liquid separator to compressor suction port.Can reduce the capacity of multi-connected indoor unit configuration, reduce air conditioning noise, improve air conditioning comfort, achieve energy-saving purpose.

Description

Technical Field

[0001] This utility model relates to air conditioning system technology, and in particular to an air conditioning system in which radiant coils and multi-split indoor units are interconnected and complementary, belonging to the field of electromechanical engineering technology. Background Technology

[0002] As living standards improve, people have increasingly higher demands for air conditioning quality. They are no longer limited to just the required cooling and heating temperatures; they also pay attention to noise levels, airflow comfort, indoor temperature uniformity, and energy consumption. Taking the most widely used residential central air conditioning system as an example, one outdoor unit powers 4-5 indoor units. In summer, the indoor units provide cooling, and in winter, they provide heating. The indoor units generate noise during operation, which can impact people's lives. Furthermore, the indoor units deliver air at lower temperatures in summer and higher temperatures in winter, causing noticeable discomfort when the air blows onto sofas, beds, or other surfaces. The uniformity of indoor temperature is also relatively poor; areas exposed to the airflow from the indoor units are too cold in summer and too hot in winter, resulting in poor air conditioning comfort.

[0003] Based on the above reasons, we are considering developing a new type of multi-split air conditioning system with radiant cooling and heating functions, in addition to conventional air conditioning. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems and provide a multi-split air conditioning system with radiant cooling and heating functions. In summer cooling conditions, the multi-split indoor unit and the floor radiant coil jointly provide cooling. In winter heating conditions, the floor radiant coil is used first for heating, with the multi-split indoor unit providing heating as a supplement. It has the characteristics of reducing the configuration capacity of the multi-split indoor unit, reducing air conditioning noise, improving air conditioning comfort, and saving energy.

[0005] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: including cooling and heating circuits, characterized in that the cooling circuit: the compressor passes through an oil separator and a four-way valve to the outdoor unit heat exchanger, the outdoor unit heat exchanger is equipped with an outdoor unit fan, and then passes through a first electronic expansion valve to split into two paths, A and B. Path A passes through the multi-split indoor unit and path B passes through a second electronic expansion valve and a Freon-water heat exchanger to converge into path D, which is then connected back to the four-way valve, and then passes through a gas-liquid separator to the compressor suction port; the heating circuit: the compressor passes through an oil separator and a four-way valve to pipe D to split into two paths, one path passes through the multi-split indoor unit and the other path passes through a Freon-water heat exchanger and a second electronic expansion valve to converge into pipe A, passes through the first electronic expansion valve to the outdoor unit heat exchanger, and then passes through a four-way valve and a gas-liquid separator to the compressor suction port.

[0006] In the aforementioned air conditioning system in which radiant coils and multi-split indoor units are interconnected and complementary, preferably, a first shut-off valve and a second shut-off valve are respectively provided before and after the multi-split indoor unit in route A; a third shut-off valve is provided in route C; and a fourth shut-off valve and a second electronic expansion valve are provided in route B.

[0007] In the aforementioned air conditioning system in which radiant coils and multi-split indoor units are interconnected and complementary, preferably, the return air vent of the multi-split indoor unit is equipped with a dew point sensor, and a temperature probe is installed at the ground radiant coil location.

[0008] In the aforementioned air conditioning system in which radiant coils and multi-split indoor units are interconnected and complementary, preferably, a manifold is provided on one side of the ground radiant coil, and an electric valve is provided on the manifold.

[0009] In the aforementioned air conditioning system where radiant coils and multi-split indoor units are interconnected and complementary, preferably, the ground radiant coil has a serpentine, double-serpentine, or spiral coil structure.

[0010] In the aforementioned air conditioning system where radiant coils and multi-split indoor units are interconnected and complementary, preferably, the high-temperature, high-pressure refrigerant discharged from the compressor preferentially enters the refrigerant-water heat exchanger, where it releases heat and condenses into liquid refrigerant. Simultaneously, it produces hot water at 50-40 degrees Celsius, which is then pumped into the radiant floor coils for radiant heating. When the heat load exceeds the heating demand of the radiant floor coils, the excess high-temperature, high-pressure refrigerant enters the heat exchanger of the multi-split indoor unit to release heat and condense into liquid refrigerant to heat the indoor air.

[0011] In the aforementioned air conditioning system that combines radiant coils and multi-split indoor units in a complementary manner, the indoor temperature and humidity control is as follows: During summer cooling operation, the multi-split indoor units and the radiant floor coils work together to provide cooling; radiant cooling is considered basic cooling and is not regulated. The indoor temperature is controlled by the multi-split indoor units adjusting the first electronic expansion valve based on the return air temperature to control the refrigerant flow. During winter heating operation, radiant floor coils are prioritized for heating, and the indoor units may be shut down. The indoor temperature is regulated by the electric valve on the manifold of the radiant floor heating system.

[0012] This technical solution comprises a new, practical air conditioning system that combines radiant cooling / heating and a multi-split air conditioning system to achieve mutual compensation, energy efficiency, and reduced noise. The two components utilize conventional gas-liquid circuit control methods such as four-way valves, shut-off valves, and expansion valves to achieve a safe, reliable, easily controllable, easily adjustable, and highly operable cooling / heating system.

[0013] Compared with the existing technology, the beneficial effects of this utility model are: in summer cooling mode, the multi-split indoor unit and the floor radiant coil are used together for cooling; in winter heating mode, the floor radiant coil is used first for heating, and the multi-split indoor unit is used for heating as a supplement; it can reduce the configuration capacity of the multi-split indoor unit, reduce air conditioning noise, improve air conditioning comfort, and achieve the purpose of energy saving. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of this utility model.

[0015] In the diagram: 1-Compressor, 2-Oil separator, 3-Four-way valve, 4-Outdoor unit fan, 5-Outdoor unit heat exchanger, 601-First electronic expansion valve, 602-Second electronic expansion valve, 7-Gas-liquid separator, 801-First shut-off valve, 802-Second shut-off valve, 803-Third shut-off valve, 804-Fourth shut-off valve, 9-Freon-water heat exchanger, 10-Circulating water pump, 11-Multi-split indoor unit, 12-Ground radiant coil. Detailed Implementation

[0016] The technical solution of this utility model will be further described in detail below through embodiments and with reference to the accompanying drawings.

[0017] This embodiment describes a multi-split air conditioning system with radiant cooling and heating functions, the structure of which is as follows: Figure 1 As shown, it includes cooling and heating circuits. In the cooling circuit, the compressor 1 discharges Freon gas, which passes through the oil separator 2 and the four-way valve 3 to the outdoor unit heat exchanger 5 for condensation. The outdoor unit heat exchanger 5 is forced to dissipate heat through the outdoor unit fan 4. The condensed liquid Freon is divided into two paths, A and B, through the first electronic expansion valve 601. Path A is cooled by the indoor unit 11 of the multi-split system, and then it is combined with path B by the second electronic expansion valve 602 and the Freon-water heat exchanger 9 for cooling before converging into path D, which is connected back to the four-way valve 3 and then through the gas-liquid separator 7 to the suction port of the compressor 1.

[0018] Heating circuit: The refrigerant gas discharged from compressor 1 passes through oil separator 2 and four-way valve 3 to pipe D, where it splits into two paths. One path releases heat through the indoor unit 11 of the multi-split unit, and the other path releases heat through the refrigerant-water heat exchanger 9 and the second electronic expansion valve 602 before converging into pipe A. The liquid refrigerant passes through the first electronic expansion valve 601 to the outdoor unit heat exchanger 5 for evaporation and cooling. The outdoor unit heat exchanger 5 is forced to cool by the outdoor unit fan 4. The evaporated gaseous refrigerant passes through four-way valve 3 and gas-liquid separator 7 to the suction port of compressor 1.

[0019] In Route A, the multi-split indoor unit 11 is equipped with a first shut-off valve 801 and a second shut-off valve 802 before and after it, respectively. Route C is equipped with a third shut-off valve 803, and Route B is equipped with a fourth shut-off valve 804 and a second electronic expansion valve 602. In the Freon-water heat exchanger 9 and the floor radiant coil 12 heat exchange system, a circulating water pump 10 and a manifold are installed on one side of the floor radiant coil 12, and an electric valve is installed on the manifold. A dew point sensor is installed at the return air vent of the multi-split indoor unit 11, and a temperature probe is installed on the radiant cooling and heating floor. When the floor temperature approaches the indoor dew point temperature, the multi-split indoor unit is forcibly started for cooling and dehumidification.

[0020] A dew point sensor is installed at the return air vent of the multi-split indoor unit 11, and a temperature probe is installed at the floor radiant coil 12. A manifold with an electric valve is also installed on one side of the floor radiant coil 12. The manifold and each circuit are equipped with independent valves for easy maintenance and adjustment.

[0021] Ground radiant heating coils are made of flexible, corrosion-resistant, and long-life cross-linked polyethylene (PEX) pipes, but high-temperature resistant polyethylene (PERT) pipes suitable for low-temperature hot water systems can also be used. In practical applications, the coil structure is designed as a serpentine, double-serpentine, or spiral shape according to the on-site heating area to ensure uniform heat distribution.

[0022] Working principle and operation:

[0023] Summer cooling operation: The multi-split indoor unit 11 and the floor radiant coil 12 provide combined cooling. The high-temperature, high-pressure refrigerant discharged from the compressor 1 is cooled by the outdoor unit heat exchanger 5 and the outdoor unit fan 4, becoming high-pressure liquid refrigerant, which is then divided into two paths, A and B, by the first electronic expansion valve 601.

[0024] Refrigerant A enters the multi-split indoor unit 11 via its built-in electronic expansion valve and evaporates in the heat exchanger, absorbing heat from the circulating indoor air and becoming a gaseous refrigerant, while simultaneously reducing indoor air temperature and humidity. Refrigerant B enters the Freon-water heat exchanger 9 via the second electronic expansion valve 602, where it evaporates, absorbing heat from the water and becoming a gaseous refrigerant, while simultaneously producing 16-17 degree Celsius high-temperature chilled water, which is then pumped by the circulating water pump 10 into the floor radiant coil 12 for radiant cooling. At this time, the multi-split indoor unit 11 and the floor radiant coil 12 provide combined cooling. Radiant cooling is considered basic cooling, expected to handle 30%-35% of the indoor sensible heat load, while the multi-split indoor unit handles 65%-70% of the indoor sensible heat load and 100% of the latent heat load. Indoor temperature and humidity are controlled by the indoor unit. Both gaseous refrigerants A and B pass through the D-channel to the four-way valve 3, then through the gas-liquid separator 7 before entering the compressor 1, circulating continuously.

[0025] Winter heating operation: Radiant floor heating is prioritized, with multi-split indoor unit heating as a secondary option. The high-temperature, high-pressure refrigerant discharged from compressor 1 preferentially enters the refrigerant-water heat exchanger 9, where it releases heat and condenses into liquid refrigerant. Simultaneously, it produces 50-40 degree Celsius hot water, which is then pumped through circulating water pump 10 to the radiant floor heating coils 12 for radiant heating. When the heat load exceeds the radiant floor heating demand, excess high-temperature, high-pressure refrigerant enters the heat exchanger of the multi-split indoor unit 11, where it releases heat and condenses into liquid refrigerant to heat the indoor air. Alternatively, if the heat load is high, another portion of the high-temperature, high-pressure refrigerant can also enter the heat exchanger of the multi-split indoor unit 11, releasing heat and condensing into liquid refrigerant to heat the indoor air. The liquid refrigerant passes through the first electronic expansion valve 601, evaporates in the outdoor unit heat exchanger 5 and outdoor unit fan 4, becoming gaseous refrigerant. This gaseous refrigerant then passes through the four-way valve 3, the gas-liquid separator 7, and then enters compressor 1, thus completing the cycle.

[0026] Indoor temperature and humidity control:

[0027] In summer cooling mode, the multi-split indoor unit 11 and the floor radiant coil 12 work together for cooling. Radiant cooling is the basic cooling system and is not regulated. The indoor temperature is regulated by the multi-split indoor unit 11, which adjusts the first shut-off valve 801 and the second shut-off valve 802 based on the return air temperature, controlling the refrigerant flow. A dew point sensor is installed at the return air vent of the multi-split indoor unit 11, and a temperature probe is installed on the radiant floor. When the floor temperature approaches the indoor dew point temperature, the multi-split indoor unit 11 is forcibly activated for cooling and dehumidification to ensure no condensation on the floor. In winter heating mode, the floor radiant coil 12 is used preferentially for heating; the indoor units are generally not turned on. The indoor temperature can be adjusted via the electric valve on the manifold of the floor radiant heating system.

[0028] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the structure of the present invention made by those skilled in the art without departing from the principles of the present technical solution and without creative effort shall fall within the protection scope of the present invention.

Claims

1. An air conditioning system in which radiant coils and multi-split indoor units are interconnected and complementary, comprising cooling and heating circuits, characterized in that: Cooling circuit: The compressor (1) goes through the oil separator (2) and the four-way valve (3) to the outdoor unit heat exchanger (5). The outdoor unit heat exchanger is equipped with an outdoor unit fan (4). Then, it is divided into two paths, A and B, through the first electronic expansion valve (601). Path A goes through the multi-split indoor unit (11) and path B goes through the second electronic expansion valve (602) and the Freon-water heat exchanger (9) to the D path. It is then connected back to the four-way valve and then through the gas-liquid separator (7) to the compressor suction port. Heating circuit: The compressor goes through the oil separator and the four-way valve to the D pipe and is divided into two paths. One path goes through the multi-split indoor unit (11) and the other path goes through the Freon-water heat exchanger (9) and the second electronic expansion valve to the A pipe. After passing through the first electronic expansion valve, it goes to the outdoor unit heat exchanger and then through the four-way valve and the gas-liquid separator to the compressor suction port.

2. The air conditioning system with radiant coils and multi-split indoor units interconnected and complementary as described in claim 1, characterized in that, The multi-split indoor unit (11) in the A route is equipped with a first shut-off valve (801) and a second shut-off valve (802) before and after it, respectively; the C route is equipped with a third shut-off valve (803), and the B route is equipped with a fourth shut-off valve (804) and a second electronic expansion valve (602).

3. The air conditioning system of claim 1, which combines radiant coils and multi-split indoor units in a complementary manner, is characterized in that... The return air vent of the multi-split indoor unit (11) is equipped with a dew point sensor, and a temperature probe is provided at the ground radiant coil (12).

4. The air conditioning system of claim 3, which combines radiant coils and multi-split indoor units in a complementary manner, is characterized in that... A water manifold is provided on one side of the ground radiant coil (12), and an electric valve is provided on the water manifold.

5. The air conditioning system of claim 3, which combines radiant coils and multi-split indoor units in a complementary manner, is characterized in that... The ground radiant coil (12) has a serpentine, double serpentine, or spiral coil structure.

6. The air conditioning system of claim 1, which combines radiant coils and multi-split indoor units in a complementary manner, is characterized in that... In winter heating mode, the compressor (1) discharges high-temperature and high-pressure Freon into the Freon-water heat exchanger (9), where it releases heat and condenses to become liquid Freon. At the same time, it produces hot water at 50-40 degrees Celsius, which is then pumped into the ground radiant coil (12) for radiant heating via the circulating water pump (10). When the heat load exceeds the heating demand of the ground radiant coil, the excess high-temperature and high-pressure Freon enters the heat exchanger of the multi-split indoor unit (11) to release heat and condense to become liquid Freon to heat the indoor air.

7. The air conditioning system of claim 1, which combines radiant coils and multi-split indoor units in a complementary manner, is characterized in that... Indoor temperature and humidity control: In summer cooling mode, the multi-split indoor unit (11) and the floor radiant coil (12) are used together for cooling. Radiant cooling is a basic cooling and is not adjusted. The indoor temperature is controlled by the multi-split indoor unit adjusting the first electronic expansion valve (601) according to the return air temperature to control the refrigerant flow. In winter heating mode, floor radiant coil heating is given priority and the indoor unit is turned off. The indoor temperature is regulated by an electric valve on the manifold of the radiant floor heating system.

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