Air conditioner high-energy-efficiency heat supply method based on energy transfer device

Abstract

An air conditioner high-energy-efficiency heat supply method based on an energy transfer device is characterized in that heat is supplied to a room through air conditioner hot air supply, and heat accumulated in the upper space of the room due to hot buoyancy is transferred to the lower space of the room where a personnel activity area is located through the energy transfer device; energy of the upper space of the room is recycled to create a thermal environment of the lower space of the room, and energy consumption of an air conditioner is reduced; the method can relieve the air thermal stratification problem and reduce the head and foot temperature difference, so that the thermal comfort is improved; according to the method, the energy consumption of the air conditioner can be reduced by 80.6%, the head and foot temperature differences of the sitting posture and the standing posture can be reduced by 84.0% and 82.8% respectively, and the thermal comfort is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning and heating, and in particular relates to a high-efficiency heating method for air conditioning based on an energy transfer device. Background Art

[0002] Winter heating is an inevitable requirement for creating a thermally comfortable environment. However, winter heating consumes a lot of energy and is the focus of energy conservation and emission reduction in the construction field. On-demand heating is a major technical path for high-efficiency heating.

[0003] There are two main heating methods: radiation and convection. Radiant heating creates a uniform thermal environment with high comfort, but its thermal response is slow and is not suitable for heating on demand. Convection heating has a fast thermal response and is suitable for heating on demand. Air conditioning is the most common form of convection heating and is widely used in residential and office buildings.

[0004] However, the heat waste and thermal discomfort caused by the heat buoyancy of air conditioning convection heating need to be solved urgently. Because the hot air supply of convection heating is affected by the heat buoyancy, the hot air supply floats to the upper space of the room, causing the heat of the supply air to accumulate in the upper space of the room. The heat accumulated in the upper space of the room cannot be used to create a thermal environment in the personnel activity area, resulting in a waste of hot air supply energy and low thermal efficiency in creating a thermal environment in the personnel activity area. At the same time, the heat accumulated in the upper space of the room causes thermal stratification in the room, resulting in thermal discomfort caused by a large temperature difference between the head and feet. Summary of the invention

[0005] In order to overcome the above-mentioned problems of the prior art, the purpose of the present invention is to provide a high-efficiency heating method for air conditioning based on an energy transferor, which utilizes the energy transferor to transfer the heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located, thereby recycling the energy of the upper space of the room to create a thermal environment in the lower space of the room, and alleviate the thermal discomfort problem caused by excessive temperature difference between the head and feet, thereby achieving high-efficiency creation of a thermally comfortable environment.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] A high-efficiency heating method for air conditioning based on an energy transferor, which uses the hot air supplied by the air conditioner to provide heat to the room, and uses the energy transferor to transfer the heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located; the power source of the energy transferor is a fan, including a cross-flow fan, or other types of fans that can generate similar power.

[0008] The energy transferor is installed in the upper space of the room. The air inlet of the energy transferor is a negative pressure area. Hot air is sucked from the upper space of the room. The attachment effect of the air flow at the air inlet to the top of the room (ceiling) is utilized to increase the ability to suck hot air from the upper space of the room.

[0009] The energy transferor is installed near the wall surface, and the air outlet of the energy transferor sends hot air to the lower space of the room where the personnel activity area is located. The hot air is sent to the lower space of the room where the personnel activity area is located by utilizing the wall adhesion effect of the air flow at the air outlet.

[0010] The air outlet of the energy transferor flows toward the lower part of the room while adhering to the wall surface. The air outlet jet can suck the indoor air along the way. The suction force is particularly strong in the upper space of the room, and more hot air in the upper space of the room is sent to the lower space of the room where the personnel activity area is located.

[0011] The greater the air velocity at the air outlet of the energy transfer device, the more hot air in the upper space of the room can be delivered to the lower space of the room where the personnel activity area is located. The maximum value of the air velocity at the air outlet of the energy transfer device is determined based on the limit value of the increase in the air velocity in the personnel activity area caused by the hot air supply at the air outlet, and the limit value of the air velocity in the personnel activity area is determined based on the thermal comfort standard or the thermal preference of the personnel.

[0012] The installation position of the energy transferor is kept at a distance from the air conditioner, and the distance is sufficient to avoid short circuit between the air inlet and outlet of the energy transferor and the air inlet and outlet of the air conditioner.

[0013] The distance between the inlet of the energy transferor and the outlet of the air conditioner should be such as to prevent the hot air from the outlet of the air conditioner from directly entering the energy transferor.

[0014] The distance between the outlet of the energy transferor and the inlet of the air conditioner should be such as to prevent the hot air supply from the outlet of the energy transferor from directly entering the air conditioner.

[0015] The energy transfer device is not provided with a heat treatment device.

[0016] When the indoor relative humidity deviates from the comfort zone, the energy transferor may be loaded with an air humidity treatment module to perform humidity treatment on the air entering the energy transferor.

[0017] When the indoor air is polluted, the energy transferor can be loaded with an air purification module to purify the air entering the energy transferor.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) The energy transferor of the present invention has a strong ability to transfer heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located. This is mainly due to the combined effect of three major principles: First, the negative pressure area at the inlet of the energy transferor of the present invention utilizes the adhesion effect of the top (ceiling) of the room to increase the ability of the energy transferor to draw hot air from the upper space of the room. Second, the present invention utilizes the adhesion effect of the side wall surface to make the hot supply air at the outlet of the energy transferor be directed to the lower space of the room where the personnel activity area is located, thereby preventing the hot supply air from rising back to the upper space of the room due to thermal buoyancy before reaching the lower space of the room where the personnel activity area is located. Third, the entrainment force of the hot supply air at the outlet of the energy transferor of the present invention carries more hot air from the upper space of the room into the hot supply air jet at the outlet of the energy transferor, and enters the lower space of the room where the personnel activity area is located along with the hot supply air jet at the outlet of the energy transferor.

[0020] (2) The air flow path at the inlet (close to the top of the room, i.e., the ceiling) and the air flow path at the outlet (close to the side wall) of the energy transferor of the present invention do not directly interfere with the air supply path of the air conditioner. Therefore, it can be adapted to different forms of air conditioners, so that the outlet hot air supply of the energy transferor and the outlet hot air supply of the air conditioner can work together to create a thermally comfortable environment (reduce thermal discomfort caused by the temperature difference between the head and feet) and achieve high-efficiency heating.

[0021] To sum up, the present invention utilizes the hot air supply of the air conditioner to provide heat to the room, and utilizes the energy transferor to transfer the heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located, thereby realizing the recycling of the energy of the upper space of the room to create a thermal environment in the lower space of the room where the personnel activity area is located, thereby reducing the energy consumption of the air conditioner; and the present invention can alleviate the problem of air thermal stratification, reduce the temperature difference between the head and the feet, and thus improve thermal comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a real scene diagram of an embodiment of the present invention.

[0023] Figure 2 This is a plan view of an embodiment of the present invention.

[0024] Figure 3 Measured inlet / outlet air temperature and air velocity diagram of the air conditioner and energy transfer device according to the embodiment of the present invention.

[0025] Figure 4 is a graph of air temperature and air velocity of the L1 measurement line according to an embodiment of the present invention, wherein Figure 4 (a) is the temperature diagram. Figure 4 (b) in the figure is the velocity diagram.

[0026] Figure 5 is a graph of air temperature and air velocity of the L2 measurement line according to an embodiment of the present invention, wherein Figure 5(a) is the temperature diagram, Figure 5 (b) in the figure is the velocity diagram.

[0027] Figure 6 is a graph of air temperature and air velocity of the L3 measurement line according to an embodiment of the present invention, wherein Figure 6 (a) is the temperature diagram, Figure 6 (b) in the figure is the velocity diagram.

[0028] Figure 7 is a graph of air temperature and air velocity for the L4 measurement line according to an embodiment of the present invention, wherein Figure 7 (a) is the temperature diagram, Figure 7 (b) in the figure is the velocity diagram.

[0029] Figure 8 This is a diagram of the air temperature difference on the L1-L4 measurement line according to an embodiment of the present invention.

[0030] Fig. 9 The heat consumption diagrams of the embodiments of the invention and the prior art method are shown in FIG. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The present invention provides an air-conditioning high-efficiency heating method based on an energy transfer device, which uses the air-conditioning hot air supply to provide heat to the room, and uses the energy transfer device to transfer the heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located; the power source of the energy transfer device is a cross-flow fan, or other types of fans that can generate similar power. The air conditioner is a common air conditioner, such as a cabinet air conditioner.

[0033] Example

[0034] The specific implementation scenario of the present invention is as follows Figure 1 and 2 The figure shows a living room scene. A cabinet air conditioner is installed in the living room. The existing method uses the hot air supplied by the air conditioner to provide heat to the room.

[0035] The present invention utilizes both the cabinet air conditioner and the energy transfer device to transfer the heat accumulated in the upper space of the room due to the thermal buoyancy to the lower space of the room where the personnel activity area is located.

[0036] The energy transfer device is installed in the upper space of the room. The top of the energy transfer device is 110 mm from the ceiling. The ceiling is 2.8 m from the floor. The air inlet of the energy transfer device is 1100 mm (length) × 140 mm (width). The air inlet of the energy transfer device is 140 mm from the ceiling. The air inlet of the energy transfer device is a negative pressure area, which horizontally draws hot air from the upper space of the room, and utilizes the ceiling attachment effect of the air inlet airflow to increase the ability to draw hot air from the upper space of the room.

[0037] Specifically, the energy transferor is installed in the upper space of the room and on the side wall close to the wall surface. The air outlet size of the energy transferor is 1080mm (length) × 50mm (width). The air outlet size is 13mm away from the side wall. The energy transferor sends hot air to the lower part of the room through the air outlet. The air outlet of the energy transferor sends hot air to the lower space of the room where the personnel activity area is located, and utilizes the wall adhesion effect of the hot air supply airflow at the air outlet to send the hot air to the lower space of the room where the personnel activity area is located.

[0038] The air outlet of the energy transfer device flows toward the lower space of the room while adhering to the wall surface, sucking in the indoor air. The suction force is particularly strong in the upper space of the room, and more hot air in the upper space of the room is sent to the lower space of the room where the personnel activity area is located.

[0039] The greater the air velocity at the air outlet of the energy transferor, the more hot air from the upper space of the room can be delivered to the lower space of the room where the personnel activity area is located. However, when the hot air supply at the air outlet of the energy transferor reaches the ground, it will collide with the ground and spread along the ground, causing the air velocity in the personnel activity area to increase. Therefore, the maximum value of the air velocity at the air outlet of the energy transferor is limited according to the limit value of the air velocity in the personnel activity area caused by the hot air supply at the air outlet. The limit value of the air velocity in the personnel activity area can be determined according to the thermal comfort standard (such as less than 0.8m / s) or according to the thermal preference of the user. In this embodiment, based on the thermal preference of the staff performing the actual measurement, the limit value of the air velocity in the personnel activity area is that the air velocity in the personnel activity area of ​​the present invention does not exceed the air velocity in the personnel activity area of ​​the existing method. The air velocity at the air outlet of the energy transferor in this embodiment is approximately 5m / s (such as Figure 3 As shown). Actual measurements show that ( Figure 4 ), the maximum wind speed in the personnel activity area of ​​the existing method is about 2.4m / s, while the maximum wind speed in the personnel activity area of ​​the present invention is about 2.0m / s. Therefore, the maximum wind speed in the personnel activity area of ​​the embodiment of the present invention does not exceed the maximum wind speed of the existing method.

[0040] The installation position of the energy transferor should be kept away from the air conditioner to avoid short circuit between the air inlet and outlet of the energy transferor and the air conditioner; the inlet of the energy transferor should not be too close to the outlet of the air conditioner to prevent the hot air supply from the outlet of the air conditioner from directly entering the energy transferor. At the same time, the outlet of the energy transferor should not be too close to the inlet of the air conditioner to prevent the hot air supply from the outlet of the energy transferor from directly entering the air conditioner. In this embodiment, the horizontal distance between the energy transferor and the air conditioner is 1.65m.

[0041] The power source of the energy transferor is a crossflow fan, or other types of fans that can generate power similar to that of a crossflow fan. The energy transferor does not need to be provided with a heat treatment device, that is, the air entering the energy transferor does not need to be heated. In this embodiment, the power source of the energy transferor is a crossflow fan, and the energy transferor is not provided with a heat treatment device, that is, the energy transferor does not heat the air entering the interior thereof.

[0042] When the indoor relative humidity deviates from the comfort zone, the energy transferor can be loaded with an air humidity treatment module to perform humidity treatment on the air entering the energy transferor. For example, when heating in winter in the north, the relative humidity is often too low, and an air humidification module can be loaded on the energy transferor to perform humidification treatment on the air entering the energy transferor. In this embodiment, the energy transferor is not loaded with an air humidity treatment module, and the air entering the energy transferor is not subjected to humidity treatment.

[0043] When the indoor air is seriously polluted, the energy transferor can be loaded with an air purification module to purify the air entering the energy transferor. For example, a filter module / ultraviolet disinfection module is loaded on the energy transferor to filter / sterilize the air in the energy transferor. In this embodiment, the energy transferor is not loaded with an air purification module, and the air entering the energy transferor is not purified.

[0044] This embodiment measures the inlet and outlet air temperatures and outlet air speed of the air conditioner, and the outlet air temperature and speed of the energy transfer device. The experiment also measures the L1-L4 lines ( Figure 2 ). Each measuring line measures the air temperature and velocity at four heights: 0.1m, 1.1m, 1.7m and 2.7m. The L1 and L3 measuring lines are located near and far from the air conditioner supply jet, respectively. The L2 and L3 measuring lines are located near and far from the energy transferor supply jet, respectively. The L4 measuring line is far away from the air conditioner supply jet area and the energy transferor supply jet area.

[0045] The actual measurement of this embodiment lasted for 100 minutes. In this embodiment, the existing method was used for the first 58 minutes, and only the air conditioner was turned on. When the existing method was used, the first 10 minutes were the air conditioner startup stage, and the air conditioner ran stably (i.e., stable air supply) thereafter. When the existing method was used, when the air conditioner was running stably, the air temperature at the air conditioner outlet (i.e., the air supply temperature) was as high as 54°C, resulting in a strong thermal buoyancy of the air supply, causing the thermal stratification temperature difference of the measuring line L1-L4 (i.e., the temperature difference at 2.7m and 0.1m) to be between 10.1°C–12.5°C (11.3°C on average) ( Figure 4 – Figure 8 ). This indicates that the existing method causes a large amount of heat to accumulate in the upper space of the room, resulting in heat waste. The heat consumption of the existing method is as high as 10.2kW ( Fig. 9 ).

[0046] Under the existing method, the head-foot temperature difference in sitting position (i.e., the temperature difference at 1.1m and 0.1m) and the head-foot temperature difference in standing position (i.e., the temperature difference at 1.7m and 0.1m) of the measurement lines L1-L4 are between 6.1℃–9.2℃ (average 6.9℃) and 8.0℃–14.6℃ (average 9.9℃), respectively. Figure 4 – Figure 8 ), far exceeding the upper limit of head-to-foot temperature difference stipulated in the thermal comfort standard (i.e. 3°C), resulting in thermal discomfort.

[0047] In this example, the method of the present invention was used for the last 42 minutes. Under the method of the present invention, the thermal stratification temperature difference (i.e., the temperature difference at 2.7m and 0.1m) was reduced to 2.3°C-2.7°C (average 2.6°C) ( Figure 4 – Figure 8 ), which shows that the present invention effectively transfers the heat from the upper space of the room to the lower space of the room where the personnel activity area is located, which is used to create a thermally comfortable environment in the personnel activity area, and reuses the heat that was originally wasted. Since the present invention can efficiently use heat to create a thermally comfortable environment, the present invention reduces the heat consumption to 2.0kW, and the energy saving rate is 80.6% (compared with the existing method Fig. 9 ).

[0048] Under the method of the present invention, the head-foot temperature difference in sitting position (i.e., the temperature difference at 1.1m and 0.1m) and the head-foot temperature difference in standing position (i.e., the temperature difference at 1.7m and 0.1m) of the measuring lines L1-L4 are between 0.9℃–1.3℃ (1.1℃ on average) and 1.4℃–1.9℃ (1.7℃ on average), respectively. Figure 4 – Figure 8 ). Compared with the existing method, the present method reduces the temperature difference between the head and feet in sitting and standing positions by 84.0% and 82.8% respectively, meeting the thermal comfort requirement of the head and foot temperature difference specified in the thermal comfort standard (less than 3°C), and overcoming the thermal discomfort problem of the existing method caused by the excessive temperature difference between the head and feet.

[0049] In summary, the existing air conditioning heating method is limited by thermal buoyancy, resulting in heat accumulation in the upper space of the room, facing the problem of low energy efficiency in creating a thermal environment and thermal discomfort caused by excessive temperature difference between the head and feet. The present invention uses the hot air supply of the air conditioner to provide heat to the room, and uses an energy transferor to transfer the heat accumulated in the upper space of the room due to thermal buoyancy to the lower space of the room where the personnel activity area is located, so as to realize the reuse of energy in the upper space of the room to create a thermal environment in the lower space of the room, and the energy saving rate reaches 80.6%; and the present invention reduces the temperature difference between the head and feet in the sitting and standing positions by 84.0% and 82.8% respectively, ensuring the thermal comfort of the temperature difference between the head and feet.

Claims

1. An air conditioning high energy efficiency heating method based on an energy transfer device, characterized in that: The hot air from the air conditioner is used to provide heat to the room, and the heat accumulated in the upper space of the room due to thermal buoyancy is transferred to the lower space of the room where the personnel are active by an energy transferor; the power source of the energy transferor is a fan, including a cross-flow fan, or other types of fans that can generate similar power.

2. The high-efficiency heating method for air conditioning based on an energy transfer device according to claim 1, characterized in that: The energy transferor is installed in the upper space of the room. The air inlet of the energy transferor is a negative pressure area. Hot air is sucked from the upper space of the room. The ceiling attachment effect of the air flow at the air inlet is utilized to increase the ability to suck hot air from the upper space of the room.

3. The high-efficiency heating method for air conditioning based on an energy transfer device according to claim 1, characterized in that: The energy transferor is installed near the wall surface, and the air outlet of the energy transferor sends hot air to the lower space of the room where the personnel activity area is located. The hot air is sent to the lower space of the room where the personnel activity area is located by utilizing the wall adhesion effect of the hot air flow at the air outlet.

4. The high-efficiency heating method for air conditioning based on an energy transfer device according to claim 1, characterized in that: The air outlet of the energy transfer device flows toward the lower part of the room while adhering to the wall surface, and the air outlet jet sucks the indoor air along the way. The suction force is particularly strong in the upper space of the room, and more hot air from the upper space of the room is sent to the lower space of the room where the personnel activity area is located.

5. The high-efficiency heating method for air conditioning based on an energy transfer device according to claim 1, characterized in that: The greater the air velocity at the outlet of the energy transferor, the more hot air from the upper space of the room can be delivered to the lower space of the room where the personnel activity area is located. However, the maximum value of the air velocity at the outlet of the energy transferor is determined based on the limited value of the air velocity in the personnel activity area caused by the hot air supply at the outlet. The limited value of the air velocity in the personnel activity area is determined based on the thermal comfort standard or the thermal preference of the personnel.

6. The high-efficiency heating method for air conditioning based on an energy transfer device according to claim 1, characterized in that: The installation position of the energy transferor is kept at a distance from the air conditioner, and the distance is sufficient to avoid short circuit between the air inlet and outlet of the energy transferor and the air inlet and outlet of the air conditioner.

7. The high-efficiency heating method for air conditioning based on an energy transfer device according to claim 6, characterized in that: The distance between the inlet of the energy transfer device and the outlet of the air conditioner should meet the following requirements: prevent the hot air supply from the air conditioner from directly entering the energy transfer device; The distance between the outlet of the energy transferor and the inlet of the air conditioner should satisfy the requirement of preventing the hot air from the outlet of the energy transferor from directly entering the air conditioner.

8. The high-efficiency heating method for air conditioning based on an energy transfer device according to claim 1, characterized in that: The energy transfer device is not provided with a heat treatment device.

9. The high-efficiency heating method for air conditioning based on an energy transfer device according to claim 1, characterized in that: When the indoor relative humidity deviates from the comfort zone, the energy transferor may be loaded with an air humidity treatment module to perform humidity treatment on the air entering the energy transferor.

10. The high-efficiency heating method for air conditioning based on an energy transfer device according to claim 1, characterized in that: When there is a problem of indoor air pollution, the energy transferor can be loaded with an air purification module to purify the air entering the energy transferor.

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