Multi-split air conditioning system with radiant cooling and heating functions

Abstract

The invention discloses a multi-split air conditioning system with radiant cooling and heating functions, which comprises a multi-split indoor unit and a ground radiation coil pipe, and is characterized in that the ground radiation coil pipe and the multi-split indoor unit are formed through a cooling / heating control loop, and the multi-split indoor unit and the ground radiation coil pipe are combined for cooling under the cooling working condition in summer; in winter heat supply working conditions, ground radiation coil pipe heating and multi-split air conditioner indoor unit heating are preferentially adopted for assistance. The configuration capacity of the multi-split indoor unit is reduced, the noise of the air conditioner is reduced, the comfort of the air conditioner is improved, and the energy-saving purpose is achieved.

Description

Technical Field

[0001] The present invention relates to the technology of air conditioning systems, in particular to a multi-connected air conditioning system with radiant cooling and heating functions, belonging to the technical field of mechanical and electrical engineering. Background Art

[0002] With the improvement of living standards, people's requirements for the quality of air conditioners are also getting higher and higher. They not only focus on the cooling and heating temperature requirements of air conditioners, but also pay attention to the noise impact, the blowing feeling impact, the indoor air-conditioning temperature uniformity requirements, and the energy consumption of air conditioners. Taking the household central air-conditioning system that is most widely used in the prior art as an example, one outdoor unit drives 4 to 5 indoor units. In summer, the indoor units cool, and in winter, the indoor units heat. During the use of the indoor units, certain noise will be generated, which will have a certain impact on people's lives. In addition, the air supply temperature of the indoor units is relatively low in summer and relatively high in winter, and there will be an obvious sense of discomfort when blowing on sofas, beds and other parts. At the same time, the uniformity of the indoor temperature is also relatively poor. The places blown by the indoor units are too cold in summer and too hot in winter, resulting in poor air-conditioning comfort.

[0003] For the above reasons, on the basis of conventional air conditioners, it is considered to develop a new type of multi-connected air conditioning system with radiant cooling and heating functions. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems, and provide a multi-connected air conditioning system with radiant cooling and heating functions. In the summer cooling condition, the multi-connected indoor unit and the floor radiant coil are used for combined cooling. In the winter heating condition, the floor radiant coil is preferentially used for heating, and the multi-connected indoor unit is used for auxiliary heating. It has the characteristics of reducing the configuration capacity of the multi-connected indoor unit, reducing air-conditioning noise, improving air-conditioning comfort, and saving energy.

[0005] The above technical problems of the present invention are mainly solved by the following technical solutions: A multi-connected air conditioning system with radiant cooling and heating functions, including a multi-connected indoor unit and a floor radiant coil, characterized in that the floor radiant coil and the multi-connected indoor unit form through a cooling / heating control circuit:

[0006] Summer cooling condition: The multi-connected indoor unit and the floor radiant coil are used for combined cooling;

[0007] Winter heating condition: The floor radiant coil is preferentially used for heating, and the multi-connected indoor unit is used for auxiliary heating.

[0008] In the foregoing multi-connected air conditioning system with radiant cooling and heating functions, preferably, when the multi-connected indoor unit and the floor radiant coil are used for combined cooling, the radiant cooling is the basic cooling, which undertakes 30% - 35% of the indoor sensible heat load, and the indoor unit undertakes 65% - 70% of the indoor sensible heat load and 100% of the latent heat load.

[0009] In the foregoing multi-connected air conditioner system with radiant cooling and heating functions, preferably, the cooling / heating control loop includes:

[0010] Cooling control loop: The Freon gas discharged from the compressor passes through the oil separator and the four-way valve to the outdoor unit heat exchanger for condensation. The outdoor unit heat exchanger forcibly discharges heat through the outdoor unit fan; the condensed liquid Freon is divided into two paths, A and B, by the first electronic expansion valve. Path A releases cold after passing through the multi-connected indoor unit and then converges with path B, which releases cold after passing through the second electronic expansion valve and the Freon-water heat exchanger, to path D, and then returns to the four-way valve, passes through the gas-liquid separator to the compressor suction port.

[0011] Heating control loop: The Freon gas discharged from the compressor passes through the oil separator and the four-way valve to path D pipe and is divided into two paths. One path releases heat after passing through the multi-connected indoor unit and then converges with the other path, which releases heat through the Freon-water heat exchanger and the second electronic expansion valve, to pipe A. The liquid Freon passes through the first electronic expansion valve and then goes to the outdoor unit heat exchanger for evaporation and cooling. The outdoor unit heat exchanger forcibly discharges cold through the outdoor unit fan. The evaporated Freon gas passes through the four-way valve, passes through the gas-liquid separator to the compressor suction port.

[0012] In the foregoing multi-connected air conditioner system with radiant cooling and heating functions, preferably, in the winter heating condition: The high-temperature and high-pressure refrigerant discharged from the compressor preferentially enters the Freon-water heat exchanger, releases heat and condenses in the heat exchanger to become liquid Freon, and at the same time produces hot water at 50 - 40 degrees Celsius, which enters the floor radiant coil through the circulating water pump for radiant heating; if the heat load is large, the excess high-temperature and high-pressure Freon can enter the heat exchanger of the multi-connected indoor unit for heat release and condensation to become liquid Freon, and at the same time heat the indoor air.

[0013] In the foregoing multi-connected air conditioner system with radiant cooling and heating functions, preferably, for indoor temperature and humidity control: In the summer cooling condition, the multi-connected indoor unit and the floor radiant coil jointly provide cooling. Radiant cooling is the basic cooling and is not adjusted; the indoor temperature is adjusted by the multi-connected indoor unit according to the return air temperature to control the refrigerant flow by adjusting the first electronic expansion valve.

[0014] In the foregoing multi-connected air conditioner system with radiant cooling and heating functions, preferably, a dew point sensor is provided at the return air inlet of the multi-connected indoor unit, and a temperature probe is provided on the radiant cooling and heating floor. When the floor temperature is close to the indoor dew point temperature, the multi-connected indoor unit is forcibly started for refrigeration and dehumidification.

[0015] In the foregoing multi-connected air-conditioning system with radiant cooling and heating functions, preferably, for indoor temperature and humidity control: in the heating mode in winter, floor radiant coils are preferentially used for heating, and the indoor unit may be shut down; a manifold is provided on one side of the floor radiant coils, and an electric valve is provided on the manifold. The indoor temperature is adjusted by the electric valve on the manifold of the floor radiant heating system.

[0016] In the foregoing multi-connected air-conditioning system with radiant cooling and heating functions, preferably, a first stop valve and a second stop valve are respectively provided before and after the multi-connected indoor unit in the A circuit; a third stop valve is provided on the C circuit, and a fourth stop valve and a second electronic expansion valve are provided on the B circuit.

[0017] In the foregoing multi-connected air-conditioning system with radiant cooling and heating functions, preferably, during the heat exchange processes of the Freon-water heat exchanger and the floor radiant coils, chilled water at a high temperature of 16 - 17 degrees Celsius is simultaneously produced and enters the floor radiant coils through a circulation pump for radiant cooling.

[0018] In the foregoing multi-connected air-conditioning system with radiant cooling and heating functions, preferably, the indoor temperature and humidity are controlled by the multi-connected indoor unit.

[0019] This technical solution consists of a radiant cooling / heating system and a multi-connected air-conditioning system, jointly constituting a new practical air-conditioning system with effects such as mutual compensation, energy-saving optimization, and reduction of air-conditioning noise. The two components obtain a safe, reliable, easy-to-control, easy-to-adjust, and highly operable cooling / heating system through conventional gas-liquid circuit control means such as four-way valves, stop valves, and expansion valves.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: in the cooling mode in summer, the multi-connected indoor unit and the floor radiant coils jointly provide cooling; in the heating mode in winter, floor radiant coils are preferentially used for heating, supplemented by the multi-connected indoor unit for heating; the configuration capacity of the multi-connected indoor unit can be reduced, the air-conditioning noise can be reduced, the air-conditioning comfort can be improved, and the energy-saving purpose can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present invention.

[0022] In the figure: 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 stop valve, 802 - second stop valve, 803 - third stop valve, 804 - fourth stop valve, 9 - Freon-water heat exchanger, 10 - circulation pump, 11 - multi-connected indoor unit, 12 - floor radiant coils. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solution of the present invention is further specifically described below through embodiments and drawings.

[0024] The present embodiment provides a multi-split air conditioning system with radiant cooling and heating functions, comprising a multi-split indoor unit 11 and a floor radiant coil (12), wherein the floor radiant coil and the multi-split indoor unit are formed through a cooling / heating control loop:

[0025] Summer cooling conditions: cooling is provided by the multi-split indoor unit and the floor radiation coil.

[0026] Winter heating conditions: floor radiant coil heating is preferred, supplemented by multi-split indoor unit heating.

[0027] In the combined cooling of the multi-split indoor unit 11 and the floor radiation coil 12, radiation cooling is the basic cooling, which bears 30% to 35% of the indoor sensible heat load, and the indoor unit bears 65% to 70% of the indoor sensible heat load and 100% of the latent heat load.

[0028] Its system composition is as follows Figure 1 As shown, it includes a cooling control circuit: the Freon gas discharged from the compressor 1 passes through the oil separator 2 and the four-way valve 3 to the outdoor unit heat exchanger 5 for condensation, and the outdoor unit heat exchanger 5 is forced to discharge 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. The A path is cooled by the multi-split indoor unit 11 and the B path is cooled by the second electronic expansion valve 602 and the Freon-water heat exchanger 9, and then collected into the D path, connected back to the four-way valve 3, and passed through the gas-liquid separator 7 to the suction port of the compressor 1.

[0029] Heating control circuit: The Freon gas discharged from compressor 1 is divided into two paths through oil separator 2 and four-way valve 3 to pipe D. One path releases heat through the multi-split indoor unit 11 and the other path releases heat through Freon-water heat exchanger 9 and the second electronic expansion valve 602 and then converges to pipe A. The liquid Freon 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 discharge cold through the outdoor unit fan 4. The evaporated gaseous Freon passes through the four-way valve 3 and the gas-liquid separator 7 to the suction port of compressor 1.

[0030] The first stop valve 801 and the second stop valve 802 are respectively provided before and after the multi-split indoor unit 11 in the A circuit. The third stop valve 803 is provided on the C circuit, and the fourth stop valve 804 and the second electronic expansion valve 602 are provided on the B circuit. In the Freon-water heat exchanger 9 and the floor radiation coil 12 heat exchange system, a circulating water pump 10 and a manifold are provided on one side of the floor radiation coil 12, and an electric valve is provided on the manifold. The return air outlet of the multi-split indoor unit 11 is provided with a dew point sensor, and a temperature probe is provided on the radiation cooling and heating ground. When the ground temperature is close to the indoor dew point temperature, the multi-split indoor unit is forced to start for cooling and dehumidification.

[0031] The ground radiation coil is made of cross-linked polyethylene pipe (PEX) with flexibility, corrosion resistance and long life. It can also use high temperature resistant polyethylene pipe (PERT) suitable for low temperature hot water system. In actual application, it is designed into a serpentine, double serpentine or spiral structure according to the heating area on site to ensure uniform heat distribution. The manifold and each circuit are equipped with independent valves for easy maintenance and adjustment.

[0032] Working principle and specific operation status:

[0033] Summer cooling condition: The multi-split indoor unit 11 and the ground radiation coil 12 jointly provide cooling. The high-temperature and high-pressure Freon discharged by the compressor 1 is converted into high-pressure liquid Freon after being dissipated by the outdoor unit heat exchanger 5 and the outdoor unit fan 4, and is divided into two paths A and B through the first electronic expansion valve 601: the Freon in path A enters the electronic expansion valve (self-contained) of the multi-split indoor unit 11 and evaporates in the heat exchanger of the multi-split indoor unit 11, absorbs the heat of the indoor circulating air, and becomes gaseous Freon, while reducing the indoor air temperature and humidity. The refrigerant in path B enters the Freon-water heat exchanger 9 through the second electronic expansion valve 602 and evaporates in the heat exchanger, absorbing the heat in the water and becoming gaseous Freon, while producing high-temperature chilled water of 16 to 17 degrees, and enters the ground radiation coil 12 through the circulating water pump 10 for radiation cooling. At this time, the multi-split indoor unit 11 and the ground radiation coil 12 jointly provide cooling. Radiation cooling belongs to basic cooling, which is expected to bear 30% to 35% of the indoor sensible heat load, and the multi-split indoor unit bears 65% to 70% of the indoor sensible heat load and 100% of the latent heat load. Indoor temperature and humidity are controlled by the indoor unit. The two-way gas Freon of A and B goes to the four-way valve 3 through the D path, and enters the compressor 1 after passing through the gas-liquid separator 7, and circulates back and forth.

[0034] Winter heating conditions: floor radiation coil heating is preferred, and multi-split indoor unit heating is supplementary. The high-temperature and high-pressure Freon discharged from the compressor 1 enters the Freon-water heat exchanger 9 first, releases heat and condenses in the heat exchanger to become liquid Freon, and at the same time produces 50-40 degree hot water, which enters the floor radiation coil 12 through the circulating water pump 10 for radiation heating. At this time, if the heat load is large, another part of the high-temperature and high-pressure Freon can also enter the heat exchanger of the multi-split indoor unit 11 to release heat and condense, becoming liquid Freon, and heating the indoor air at the same time. After the liquid Freon passes through the first electronic expansion valve 601, it evaporates in the outdoor unit heat exchanger 5 and the outdoor unit fan 4 and becomes gas Freon. The gas Freon passes through the four-way valve 3 and then passes through the gas-liquid separator 7 before entering the compressor 1, and the cycle repeats.

[0035] Indoor temperature and humidity control:

[0036] In the summer cooling mode, the multi-connected indoor unit 11 and the floor radiant coil 12 jointly provide cooling. The radiant cooling belongs to the basic cooling and is not adjusted. The indoor temperature is adjusted by the multi-connected indoor unit 11 controlling the refrigerant flow according to the return air temperature. A dew point sensor is installed at the return air inlet of the multi-connected indoor unit 11, and temperature probes are installed on the floor for radiant cooling and heating. When the floor temperature is close to the indoor dew point temperature, the multi-connected indoor unit 11 is forced to start for cooling and dehumidifying to ensure that the indoor floor does not condense. In the winter heating mode, the floor radiant coil 12 is preferentially used for heating, and generally the indoor unit is not turned on. An integral water distributor is provided on one side of the floor radiant coil, and an electric valve is installed on the integral water distributor. The indoor temperature can be adjusted by the electric valve on the integral water distributor of the floor radiant heating system.

[0037] The above embodiments are illustrative of the present invention and not restrictive thereof. Although the present invention is described in conjunction with preferred embodiments, it should be understood that the present invention is not limited to the preferred embodiments. Those skilled in the art can make various equivalent modifications and substitutions to the technical solutions of the present invention based on the teachings of the present invention. Therefore, the scope of the present invention should be defined by the claims, and all those equivalent modifications and substitutions fall within the protection scope of the technical solutions of the present invention.

Claims

1. A multi-split air conditioning system with radiant cooling and heating functions, comprising a multi-split indoor unit (11) and a floor radiant coil (12), characterized in that The floor radiation coil and the multi-split indoor unit form a cooling / heating control loop: Summer cooling conditions: Combined cooling by multi-split indoor units and floor radiation coils; Winter heating conditions: floor radiant coil heating is preferred, supplemented by multi-split indoor unit heating.

2. The multi-split air conditioning system with radiant cooling and heating functions according to claim 1, characterized in that: The multi-split indoor unit (11) and the floor radiation coil (12) jointly provide cooling, wherein the radiation cooling is the basic cooling and bears 30% to 35% of the indoor sensible heat load, and the indoor unit bears 65% to 70% of the indoor sensible heat load and 100% of the latent heat load.

3. The multi-split air conditioning system with radiant cooling and heating functions according to claim 1 or 2, characterized in that: The cooling / heating control loop comprises: Cooling control circuit: Freon gas discharged from the compressor (1) passes through the oil separator (2) and the four-way valve (3) to the outdoor unit heat exchanger (5) for condensation, and the outdoor unit heat exchanger is forced to discharge 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), and the path A is cooled through the multi-split indoor unit (11) and the path B is cooled through the second electronic expansion valve (602) and the Freon-water heat exchanger (9) and then collected into the path D, connected back to the four-way valve, and passed through the gas-liquid separator (7) to the compressor suction port; Heating control circuit: The Freon gas discharged by the compressor passes through the oil separator and the four-way valve to the D pipe and is divided into two paths. One path releases heat through the indoor unit of the multi-split unit and the other path releases heat through the Freon-water heat exchanger and the second electronic expansion valve and then is collected to the A pipe. The liquid Freon passes through the first electronic expansion valve to the outdoor unit heat exchanger for evaporation and cooling. The outdoor unit heat exchanger is forced to discharge cold through the outdoor unit fan. The evaporated gaseous Freon passes through the four-way valve and the gas-liquid separator to the compressor suction port.

4. The multi-split air conditioning system with radiant cooling and heating functions according to claim 3, characterized in that: Winter heating conditions: The high-temperature and high-pressure refrigerant discharged from the compressor (1) enters the Freon-water heat exchanger (9) first, releases heat and condenses in the heat exchanger to become liquid Freon, and at the same time produces hot water at 50 to 40 degrees, which enters the ground radiation coil (12) through the circulating water pump (10) for radiant heating; if the heat load is large, the excess high-temperature and high-pressure Freon can enter the heat exchanger of the multi-split indoor unit (11) to release heat and condense to become liquid Freon, while heating the indoor air.

5. The multi-split air conditioning system with radiant cooling and heating functions according to claim 3, characterized in that: Indoor temperature and humidity control: In summer cooling conditions, the multi-split indoor unit (11) and the ground radiation coil (12) jointly provide cooling. Radiation cooling is basic cooling and does not require adjustment. The indoor temperature is adjusted by the multi-split indoor unit according to the return air temperature by adjusting the first electronic expansion valve (601) to control the refrigerant flow.

6. The multi-split air conditioning system with radiant cooling and heating functions according to claim 5, characterized in that: A dew point sensor is provided at the return air outlet of the multi-split indoor unit (11), and a temperature probe is provided on the radiant cooling and heating floor. When the ground temperature approaches the indoor dew point temperature, the multi-split indoor unit is forced to start cooling and dehumidifying.

7. The multi-split air conditioning system with radiant cooling and heating functions according to claim 3, characterized in that: Indoor temperature and humidity control: In winter heating conditions, the floor radiation coil (12) is preferably used for heating, and the indoor unit may be shut down; a manifold is provided on one side of the floor radiation coil, and an electric valve is provided on the manifold. The indoor temperature is adjusted by the electric valve on the manifold of the floor radiation heating system.

8. The multi-split air conditioning system with radiant cooling and heating functions according to claim 3, characterized in that: A first stop valve (801) and a second stop valve (802) are respectively provided before and after the multi-split indoor unit (11) in the A circuit; a third stop valve (803) is provided on the C circuit; and a fourth stop valve (804) and a second electronic expansion valve (602) are provided on the B circuit.

9. The multi-split air conditioning system with radiant cooling and heating functions according to claim 3, characterized in that: During the heat exchange process between the Freon-water heat exchanger (9) and the ground radiation coil (12), high-temperature chilled water of 16 to 17 degrees is produced and enters the ground radiation coil through a circulating water pump (10) for radiation cooling.

10. The multi-split air conditioning system with radiant cooling and heating functions according to claim 1, characterized in that: Indoor temperature and humidity are controlled by a multi-connected indoor unit (11).

Images