TW201542996A - Heat exchanging device and water heater using the same - Google Patents

Abstract

A heat exchanging device configured to exchange heat between a first fluid and a second fluid is provided. The heat exchanging device includes a first pipe and a second pipe. The first pipe has a first inlet and a first outlet to allow the first fluid to flow in and flow out the first pipe. The second pipe has a second inlet and a second outlet to allow the second fluid to flow in and flow out the second pipe. The first pipe is contacted with the second pipe and disposed in juxtaposition with the second pipe. A flow direction of the first fluid in the first pipe is contrary to a flow direction of the second fluid in the second pipe. The heat exchanging device has better heat exchanging efficiency. Moreover, a water heater using the heat exchanging device is also provided.

Description

Heat exchange device and water heater using same

The present invention relates to a heat exchange apparatus, and more particularly to a heat exchange apparatus capable of performing heat exchange between two fluids and a water heater using the heat exchange apparatus.

The working principle of the heat pump water heater is to collect the heat energy in the air by using a heat source medium (ie, a refrigerant), and then store the heat by a heat pump (ie, a compressor), and then exchange heat with the cold water through a heat exchanger to make the cold water gradually. The ground is warmed and converted into hot water. Since the heat pump water heater converts cold water into hot water, it uses the operating refrigerant to do energy conversion. The energy conversion efficiency can theoretically exceed 300%, which is less than the limit of 100% of the power or fire conversion efficiency. The heat pump water heater can achieve good heating effect with only a small amount of electric energy. It not only has significant economic benefits, but also produces little pollution. It is the most environmentally friendly and energy-efficient heating equipment.

As shown in FIG. 1, a conventional heat pump water heater includes a compressor 1, a heat exchanger 2, an expansion valve 3, and an evaporator 4. In operation, the compressor 1 compresses the refrigerant into a high temperature and high pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant enters the heat exchanger 2 as a heat source medium, and exchanges heat with the water stream in the heat exchanger 2 to release heat energy, so that the water flow can be heated and heated. The high temperature and high pressure gaseous refrigerant condenses by releasing heat energy, and passes through the high and low pressure difference of the expansion valve 3 (or capillary) to become a gas-liquid mixed refrigerant, and then absorbs the external heat source through the evaporator 4, and then passes the refrigerant through the compressor 1. The gaseous refrigerant compressed into high temperature and high pressure enters the heat exchanger 2, and thus continuously circulates as a heat energy transfer operation, that is, the water flow can be heated and heated in the heat exchanger 2.

It can be seen from the above process that the heat exchange operation of the heat pump type water heater is roughly condensed by the high temperature and high pressure gaseous refrigerant in the heat exchanger, and then compressed by the compressor into a high temperature gas state for the next heat exchange. In the process of storing heat in the refrigerant, the total heat energy includes latent heat and sensible heat, but when condensing in the heat exchanger, the cold water absorbs the sensible heat released by the refrigerant at the initial stage of heat exchange. The temperature is continuously increased until the cold water warms up and the refrigerant cools to the same temperature, and the refrigerant no longer releases heat.

For example, the cold water is about 25 ° C at the beginning of the heat exchange, and the refrigerant temperature is about 70 to 100 ° C. At this time, the cold water can absorb the heat of the refrigerant to rapidly heat up, and the high temperature and high pressure refrigerant cools due to the release of heat energy. When the temperature rises and the temperature drops and the temperature approaches, when the cold water rises to about 55 ° C, the refrigerant also cools to about 55 ° C. At this time, since the temperatures of the two are close to the same, the refrigerant can no longer release heat energy to the water flow. The water can no longer warm up.

In other words, when the conventional heat pump water heater exchanges heat between the refrigerant and the cold water, the water does not completely absorb the total heat stored in the refrigerant, especially in the latent heat, because the cold water heats up and the refrigerant cools to the same temperature to make the refrigerant When the heat energy is no longer released, the refrigerant still has not reached the temperature of releasing the latent heat (the heat energy released when the gas is converted into a liquid phase change), thus also causing a limitation on the heating temperature of the cold water; at present, the heat temperature of the heat pump water heater is approximately At 55 ° C, this is a major problem that the industry has been unable to overcome.

The present invention provides a heat exchange device to improve heat exchange efficiency.

The invention further provides a water heater for improving heat exchange efficiency.

In order to achieve the above advantages, an embodiment of the present invention provides a heat exchange device adapted to exchange heat between a first fluid and a second fluid. The heat exchange device includes a first tube body and a second tube body. The first tube has a first inlet and a first outlet for the first fluid to enter and exit the first tube. The second tube has a second inlet and a second outlet for the second fluid to enter and exit the second tube. The first tube contacts the second tube and is disposed side by side with the second tube, and the flow direction of the first fluid in the first tube is opposite to the flow direction of the second fluid in the second tube.

In an embodiment of the invention, the first tube body and the second tube body are respectively elliptical tubes, wherein the first tube body has a first contact surface, and the second tube body has a second contact with the first contact surface The contact faces, and the short axis of each elliptical tube extends through the first contact surface and the second contact surface.

In an embodiment of the present invention, the first tube body and the second tube body are respectively polygonal tubes, wherein the first tube body has a first contact surface, and the second tube body has a second contact surface with the first contact surface. Contact surfaces.

In an embodiment of the invention, the first tube body has a first contact surface, and the second tube body has a second contact surface in contact with the first contact surface, wherein the first contact surface has at least one recess, and the second The contact surface has at least one convex portion, and the concave portion contacts the convex portion.

In an embodiment of the invention, the first tube body has a first contact surface, and the second tube body has a second contact surface that is in contact with the first contact surface. Wherein the first contact surface has at least one convex portion, the second contact surface has at least one concave portion, and the concave portion contacts the convex portion.

In an embodiment of the invention, the first tube body and the second tube body are continuously bent.

In an embodiment of the invention, the heat exchange device further includes a heat insulating layer covering the first tube body and the second tube body.

In an embodiment of the present invention, the heat exchange device further includes a box body and a heat insulation layer, wherein the box body houses the first tube body and the second tube body, and the heat insulation layer is located in the box body and is covered by the first A tube body and a second tube body.

In order to achieve the above advantages, an embodiment of the invention provides a water heater comprising the heat exchange device of any of the above embodiments and a heating unit. The heating unit is coupled between the first outlet of the first body of the heat exchange device and the first inlet.

In an embodiment of the invention, the water heater further includes a liquid storage unit adapted to receive the second fluid flowing out of the second outlet of the second tubular body of the heat exchange device.

The heat exchanger of the present invention and the water heater using the same can effectively improve the heat exchange efficiency by causing the flow direction of the first fluid in the first pipe body to be opposite to the flow direction of the second fluid in the second pipe body.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

1‧‧‧Compressor

2‧‧‧ heat exchanger

3‧‧‧Expansion valve

4‧‧‧Evaporator

100, 100a, 100b, 100c, 100d, 100e‧‧‧ heat exchange devices

110, 110c, 110d, 110e‧‧‧ first tube

111‧‧‧First contact surface

112‧‧‧ first entrance

113‧‧‧ convex

114‧‧‧First exit

116‧‧‧ latent heat release section

118‧‧‧ sensible heat release section

120, 120c, 120d, 120e‧‧‧ second tube

121‧‧‧Second contact surface

122‧‧‧second entrance

123‧‧‧ recess

124‧‧‧second exit

126‧‧‧Preheating section

128‧‧‧High temperature section

130‧‧‧ cabinet

140‧‧‧Insulation

150‧‧‧Insulation

200‧‧‧ water heater

210‧‧‧heating unit

212‧‧‧Expansion valve

214‧‧‧Evaporator

216‧‧‧Compressor

218‧‧‧ tube body

220‧‧‧liquid storage unit

222‧‧‧ liquid storage container

224‧‧‧ pipe body

A‧‧‧ Short axis extension direction

F1‧‧‧First fluid

F2‧‧‧Second fluid

1 is a schematic view of a conventional heat pump water heater.

2 is a schematic view of a heat exchange device according to an embodiment of the present invention.

Figure 3 is a schematic cross-sectional view of the heat exchange device of Figure 2;

Figure 4 is a schematic illustration of a heat exchange apparatus in accordance with another embodiment of the present invention.

Figure 5 is a cross-sectional view showing a heat exchange device according to another embodiment of the present invention.

Figure 6 is a cross-sectional view showing a first tube body and a second tube body of a heat exchange device according to another embodiment of the present invention.

Figure 7 is a cross-sectional view showing a first tube body and a second tube body of a heat exchange device according to another embodiment of the present invention.

Figure 8 is a partial schematic view showing a first tube body and a second tube body of a heat exchange device according to another embodiment of the present invention.

Figure 9 is a schematic view of a water heater in accordance with an embodiment of the present invention.

2 is a schematic view of a heat exchange device according to an embodiment of the present invention, and FIG. 3 is a schematic cross-sectional view of the heat exchange device of FIG. 2. Referring to FIG. 2 and FIG. 3, the heat exchange device 100 of the present embodiment is adapted to exchange heat between the first fluid F1 and the second fluid F2. The heat exchange device 100 includes a first pipe body 110 and a second pipe body 120. The first pipe body 110 has a first inlet 112 and a first outlet 114 for the first fluid F1 to enter and exit the first pipe body 110. The second pipe body 120 has a second inlet 122 and a second outlet 124 for the second fluid F2 to enter and exit the second pipe body 120. The first pipe body 110 contacts the second pipe body 120 and is arranged side by side with the second pipe body 120, and the flow direction of the first fluid F1 in the first pipe body 110 is opposite to the second fluid F2 in the second pipe body 120. Flow direction.

In the present embodiment, the first inlet 112 is adjacent to the second outlet 124 and the first outlet 114 is adjacent to the second inlet 122. The first inlet 112 and the first outlet 114 referred to herein are located at both ends of the first pipe body 110, and the two ends are in contact with the first Two tubes 120. The first inlet 112 and the first outlet 114 can be respectively connected to other tubes (not shown), and the tubes can be integrally formed with the first tube 110. For example, the first inlet 112 can be connected to the first fluid supply source through other tubes. Similarly, the second inlet 122 and the second outlet 124 are referred to, for example, at both ends of the second tubular body 120, and the two ends are in contact with the first tubular body 120. The second inlet 122 and the second outlet 124 can be respectively connected to other tubes (not shown), and the tubes can be integrally formed with the second tube 120. For example, the second inlet 122 can be connected to the second fluid supply source through other tubes. In addition, the first pipe body 110 and the second pipe body 120 are, for example, circular pipe bodies, respectively, but they may also be pipe bodies of other shapes. The material of the first tube body 110 and the second tube body 120 may be a metal (such as copper), an alloy or other composite material having a high thermal conductivity.

Hereinafter, the first pipe body 110 is a heat source pipe through which the heat source medium (first fluid F1) flows, and the second pipe body 120 is a heating pipe through which the water supply (second fluid F2) flows, for example, to explain the present embodiment. The heat exchange process of the heat exchange device 100.

In the present embodiment, the heat energy of the heat source medium (first fluid F1) is transferred to the water (second fluid F2) via the first conduit 110 and the second conduit 120. Since in the heat exchange device 100, the flow direction of the first fluid F1 in the first pipe body 110 is opposite to the flow direction of the second fluid F2 in the second pipe body 120, the second pipe body 120 is water-based (second The flow direction of the fluid F2) can be sequentially differentiated into a preheating section 126 and a high temperature section 128 between the second inlet 122 and the second outlet 124. Wherein, the preheating section 126 is connected to the second inlet 122 to absorb the sensible heat of the heat source medium (the first fluid F1) in the first duct 110, and the high temperature section 128 is connected to the preheating section 126 to absorb the first duct 110. The latent heat of the internal heat source medium (first fluid F1).

In addition, the first conduit 110 is based on a heat source medium (first fluid F1) The flow direction may be sequentially divided into a latent heat release section 116 and a sensible heat release section 118 between the first inlet 112 and the first outlet 114. Wherein, the latent heat release section 116 is connected to the first inlet 112 and is opposite to the high temperature section 128 of the second conduit 120 for releasing latent heat of the heat source medium (first fluid F1). The sensible heat release section 118 is coupled to the latent heat release section 116 and relative to the preheat section 126 of the second conduit 120 for releasing sensible heat of the heat source medium (first fluid F1).

In the above configuration, the flow direction of the heat source medium (first fluid F1) in the first conduit 110 is the latent heat of releasing the heat source medium (first fluid F1) in the upstream latent heat release section 116, and then the sensible heat downstream. The release section 118 releases the sensible heat of the heat source medium (first fluid F1). In contrast, since the flow direction of the water (second fluid F2) in the second duct 120 is opposite to the flow direction of the heat source medium (first fluid F1) of the first duct 110, the preheating section 126 of the second duct 120 is advanced. The water (second fluid F2) may first absorb the sensible heat released by the heat source medium (first fluid F1) in the sensible heat release section 118, and the downstream high temperature section 128 may be in the case where the water (second fluid F2) has warmed up. Further absorbing the latent heat released by the heat source medium (first fluid F1) in the latent heat release section 116, so that the water (second fluid F2) can efficiently absorb the heat source medium after the heat exchange (the first fluid) F1) thermal energy. Therefore, the heat exchange device 100 of the present embodiment has better heat exchange efficiency, can overcome the limitations of the prior art, and achieve the advantages of increasing water temperature and saving energy.

In addition, since the first tube body 110 and the second tube body 120 are arranged side by side in this embodiment, even if the first tube body 110 is damaged, the first fluid F1 does not flow into the second tube body 120 to contaminate the second fluid. F2. Similarly, even if the second pipe body 120 is broken, the second fluid F2 does not flow into the first pipe body 110 to contaminate the first fluid F1.

The first tube body 110 and the second tube body 120 may be linear Or continuous bending, but not limited to this. Wherein, the continuous bending shape can save space under the same heat exchange distance, and the water (second fluid F2) is closer to the second outlet 124 of the second pipe body 120 and the first inlet of the first pipe body 110 The position of 112 is such that the temperature is closer to the initial high temperature when the heat source medium (first fluid F1) is compressed.

Figure 4 is a schematic illustration of a heat exchange apparatus in accordance with another embodiment of the present invention. Referring to FIG. 4, the heat exchange device 100a of the present embodiment is similar to the heat exchange device 100 described above. The main difference is that the heat exchange device 100a further includes a case 130 and a heat insulation layer 140, wherein the case 130 houses the first tube. The body 110 and the second tube body 120, and the heat insulation layer 140 is located in the box body 130, and covers the first tube body 110 and the second tube body 120. In this way, heat dissipation can be avoided, thereby improving heat exchange efficiency. The heat insulation layer 140 may be a foam, a foaming agent, an air layer or a vacuum layer or the like, which is filled in the casing 130.

Figure 5 is a cross-sectional view showing a heat exchange device according to another embodiment of the present invention. Referring to FIG. 5, the heat exchange device 100b of the present embodiment is similar to the heat exchange device 100 described above, and the main difference is that the first conduit 110 and the second conduit 120 are covered by the heat insulation layer 150 to avoid heat dissipation. Improve heat exchange efficiency. This heat insulation layer 150 may be a foam or a foaming agent or the like.

Figure 6 is a cross-sectional view showing a first tube body and a second tube body of a heat exchange device according to another embodiment of the present invention. Referring to FIG. 6, the heat exchange device 100c of the present embodiment is similar to the heat exchange device 100 described above. The main difference is that the first pipe body 110c and the second pipe body 120c of the present embodiment are respectively elliptical tubes, wherein the first tube is The body 110c has a first contact surface 111, and the second tube body 120c has a second contact surface 121 in contact with the first contact surface 111, and the short axis extending direction A of each elliptical tube is in contact with the second contact through the first contact surface 111. Face 121. Compared with the heat exchange device 100, the embodiment can improve the contact surface between the first pipe body 110c and the second pipe body 120c. Product, so it can further improve the heat exchange efficiency.

Figure 7 is a cross-sectional view showing a first tube body and a second tube body of a heat exchange device according to another embodiment of the present invention. Referring to FIG. 7, the heat exchange device 100d of the present embodiment is similar to the heat exchange device 100. The main difference is that the first pipe body 110d and the second pipe body 120d of the embodiment are polygonal pipes, such as quadrilateral pipes. But not limited to this. The first tube body 110d has a first contact surface 111, and the second tube body 120d has a second contact surface 121 that is in contact with the first contact surface 111. Compared with the heat exchange device 100, the present embodiment can increase the contact area between the first pipe body 110d and the second pipe body 120d, so that the heat exchange efficiency can be further improved.

Figure 8 is a partial schematic view showing a first tube body and a second tube body of a heat exchange device according to another embodiment of the present invention. Referring to FIG. 8, the heat exchange device 100d of the present embodiment is similar to the heat exchange device 100 described above. The main difference is that the first pipe body 110e has the first contact surface 111, and the second pipe body 120e has the same A second contact surface 121 in contact with the contact surface 111, wherein the first contact surface 111 has at least one convex portion 113, the second contact surface has at least one concave portion 123, and the concave portion 123 contacts the convex portion 113. The design of the convex portion 113 and the concave portion 123 can reduce the flow speed of the first fluid F1 and the second fluid F2, increase the time during which the first fluid F1 and the second fluid F2 exchange heat, to raise the first fluid F1 and the second fluid F2. Heat exchange efficiency.

It should be noted that the present invention does not limit the number and position of the convex portion 113 and the concave portion 123. In addition, in another embodiment, at least one concave portion may be disposed on the first contact surface of the first tubular body, and at least one convex portion may be disposed on the second contact surface of the second tubular body, and the concave portion contacts the convex portion.

Figure 9 is a schematic view of a water heater in accordance with an embodiment of the present invention. Referring to FIG. 9, the water heater 200 of the present embodiment includes the above-described heat exchange device 100 and a heating unit 210. The heating unit 210 is connected to the first tube of the heat exchange device 100 The first outlet 114 of the body 110 is between the first inlet 112 and the first inlet 112.

The heating unit 210 described above includes an expansion valve 212, an evaporator 214, and a compressor 216 that are sequentially disposed from the first outlet 114 to the first inlet 112, wherein the expansion valve 212, the evaporator 214, and the compressor 216 are mutually connected by the pipe body 218. Connected to and connected to the first outlet 114 and the first inlet 112. The heat source medium (first fluid F1) is circulated through the operation of the expansion valve 212, the evaporator 214, and the compressor 216, and continuously flows in the first pipe body 210 to exchange heat with the second fluid F2.

The water heater 200 of the present embodiment has better heat exchange efficiency because of the heat exchange device 100 described above. In this embodiment, the temperature of the water (second fluid F2) flowing out from the second outlet 124 of the second pipe body 120 can reach 70 to 100 ° C. When used in general households, it can be directly mixed with appropriate cold water for use immediately. Instant hot water heater. The water heater 200 may further include a liquid storage unit 220 for receiving the second fluid F2 flowing out of the second outlet 124 for storing hot water, if it is used in a place with a large amount of hot water used in a restaurant, an office dormitory, or the like. This can be used as a heat storage water heater. Specifically, the liquid storage unit 220 includes, for example, a liquid storage container 222 for receiving the second fluid F2 flowing out of the second outlet 124. In addition, the liquid storage unit 220 may further include a pipe body 224 connected to the second outlet 124 for guiding the second fluid F2 to the water storage container 222.

In addition, since the first pipe body 110 and the second pipe body 120 are arranged side by side, the second pipe body 120 is broken, and the second fluid F2 does not flow into the first pipe body 110, so that the second fluid F2 can be prevented from passing through the A tube body 110 flows into the heating unit 210, thereby preventing the heating unit 210 from being damaged by the inflow of the second fluid F2. It should be noted that the heat exchange device 100 of the water heater 200 of the present embodiment can be replaced with the heat exchange device of each of the above embodiments.

In summary, in the heat exchange device and the water heater of the present invention, Having the flow direction of the first fluid in the first tube opposite to the flow direction of the second fluid in the second tube allows the second fluid to first absorb the sensible heat of the first fluid in the preheating section, and then in the second fluid The latent heat of the first fluid is further absorbed in the case of temperature rise. Therefore, the temperature of the second fluid flowing out from the second outlet can effectively break the limit of the conventional technology temperature of about 55 ° C, thereby achieving the effect of increasing the water temperature and saving energy. In addition, since the first pipe body and the second pipe body are arranged side by side, even if one of the pipe bodies is broken, the fluid in the pipe body does not flow into the other pipe body.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100‧‧‧Hot exchange unit

110‧‧‧First body

112‧‧‧ first entrance

114‧‧‧First exit

116‧‧‧ latent heat release section

118‧‧‧ sensible heat release section

120‧‧‧Second body

122‧‧‧second entrance

124‧‧‧second exit

126‧‧‧Preheating section

128‧‧‧High temperature section

F1‧‧‧First fluid

F2‧‧‧Second fluid

Claims (10)

A heat exchange device adapted to exchange heat between a first fluid and a second fluid, the heat exchange device comprising: a first tubular body having a first inlet and a first outlet for the first fluid Entering and exiting the first pipe body; and a second pipe body having a second inlet and a second outlet for the second fluid to enter and exit the second pipe body, wherein the first pipe body contacts the second pipe body And being disposed alongside the second tube body, and the flow direction of the first fluid in the first tube body is opposite to the flow direction of the second fluid in the second tube body. The heat exchange device of claim 1, wherein the first tube body and the second tube body are respectively elliptical tubes, the first tube body has a first contact surface, and the second tube body has a a second contact surface in contact with the first contact surface, and a short axis extending direction of each elliptical tube passes through the first contact surface and the second contact surface. The heat exchange device of claim 1, wherein the first tube body and the second tube body are respectively polygonal tubes, the first tube body has a first contact surface, and the second tube body has a a second contact surface in contact with the first contact surface. The heat exchange device of claim 1, wherein the first tube body has a first contact surface, and the second tube body has a second contact surface in contact with the first contact surface, the first The contact surface has at least one recess, the second contact surface having at least one protrusion, and the recess contacts the protrusion. The heat exchange device of claim 1, wherein the first tube body has a first contact surface, and the second tube body has a second contact surface in contact with the first contact surface, the first The contact surface has at least one protrusion, the second contact surface having at least one recess, and the recess contacts the protrusion. The heat exchange device of claim 1, wherein the first tube body and the second tube body are continuously bent. The heat exchange device of claim 1, further comprising a heat insulating layer covering the first pipe body and the second pipe body. The heat exchange device of claim 1, further comprising: a box for accommodating the first tube body and the second tube body; and a heat insulating layer located in the box body and covering the body a first tube body and the second tube body. A water heater comprising: a heat exchange device according to any one of claims 1 to 8; and a heating unit connected to the first outlet of the first pipe body of the heat exchange device and the first inlet between. The water heater of claim 9, further comprising a liquid storage unit adapted to receive the second fluid flowing out of the second outlet of the second tubular body of the heat exchange device.