CN106152509B

CN106152509B - Layered circulating heating system of heat pump water heater

Info

Publication number: CN106152509B
Application number: CN201610819116.7A
Authority: CN
Inventors: 律宝莹; 陈萨如拉; 杨洋; 林玲; 张强
Original assignee: Tianjin University of Commerce
Current assignee: Inner Mongolia Minghui New Energy Technology Co.,Ltd.
Priority date: 2016-09-13
Filing date: 2016-09-13
Publication date: 2021-09-17
Anticipated expiration: 2036-09-13
Also published as: CN106152509A

Abstract

The invention discloses a layered circulating heating system of a heat pump water heater. The invention comprises a water tank, a first coil pipe, a second coil pipe, a third coil pipe and a water tank heating pipeline; the first coil, the second coil and the third coil are in close contact with the outer surface of the water tank through heat-conducting silicone grease, an inlet pipeline of a heating pipeline of the water tank is divided into a first heating branch, a second heating branch and a third heating branch, an inlet of the first coil is connected with the first heating branch through a first electromagnetic valve, an inlet of the second coil is connected with the second heating branch, and an inlet of the third coil is connected with the third heating branch through a second electromagnetic valve; the outlet pipeline of the water tank heating pipeline is divided into a first outlet branch, a second outlet branch and a third outlet branch, the outlet pipeline of the water tank heating pipeline is connected with the inlet of the throttling valve, the outlet of the throttling valve is connected with the inlet of the evaporator, the outlet of the evaporator is connected with the air suction port of the compressor, and the air exhaust port of the compressor is connected with the inlet pipeline of the water tank heating pipeline. The invention reduces the energy consumption of the heat pump water heater and the waste of water resources and energy.

Description

Layered circulating heating system of heat pump water heater

Technical Field

The invention relates to the field of water heaters, in particular to a layered circulation heating system of a heat pump water heater.

Background

Renewable energy utilization technology is more and more widely applied when environmental pollution and energy shortage face serious challenges. The heat pump water heater, the solar water heater and the like are widely popularized and utilized in the field of water heaters. The solar water heater depends on the sunlight heat, and the solar water heater has the characteristics of instability, low density, limitation by factors such as time and weather and the like. Compared with the prior art, the heat pump water heater has fewer limiting factors, saves energy, protects environment and is widely popularized and applied. The heat pump water heater absorbs heat of outdoor air or other heat sources through a refrigerant, so that low-grade heat energy is converted into high-grade heat energy to be transmitted to a condenser for heating water. The condenser heating method can be divided into three types, namely a direct heating method for directly heating all the water, circularly heating all the water and heating the water to a set temperature at one time and then conveying the water to the heat preservation box. The mode of directly heating the water with the whole volume and the mode of circularly heating the water with the whole volume cannot flexibly adjust the hot water quantity of the water tank, have the defect of great energy waste caused by small water consumption of a user, and the mode of heating and sending the water to the heat preservation water tank is suitable for large-scale water using places or places lacking hot water, is not suitable for small families and also has the problem of energy waste.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides the heat pump water heater circulating heating system which is simple in structure, easy to implement and capable of meeting different use requirements of users, effectively improves the operation efficiency and the use efficiency of the heat pump water heater, reduces the operation power consumption of the system and reduces the waste of resource and energy.

The technical scheme adopted for realizing the purpose of the invention is as follows:

a layered circulation heating system of a heat pump water heater is characterized by comprising a water tank 6, a first coil pipe 9, a second coil pipe 10, a third coil pipe 11 and a water tank heating pipeline 14; the first coil 9, the second coil 10 and the third coil 11 are in close contact with the outer surface of the water tank through heat-conducting silicone grease, the first coil 9 is located at the upper part of the water tank 6, the second coil 10 is located at the middle part of the water tank 6, the third coil 11 is located at the lower part of the water tank 6, two thirds of the first coil 9 and the second coil 10 are overlapped, two thirds of the second coil 10 and the third coil 11 are overlapped, and one third of the first coil 9 and the third coil 11 is overlapped; the first coil 9 starts from the upper part of the water tank 6, the second coil 10 starts from the one third position of the first coil 9, the third coil 11 starts from the one third position of the second coil 10, the first coil 9 ends at the two thirds position of the second coil 10, the second coil 10 ends at the two thirds position of the third coil 11, and the third coil 11 ends at the bottom of the water tank 6; (ii) a An inlet pipeline of the water tank heating pipeline 14 is divided into a first heating branch 21, a second heating branch 22 and a third heating branch 23, an inlet of the first coil 9 is connected with the first heating branch 21 through a first electromagnetic valve 7, an inlet of the second coil 10 is connected with the second heating branch 22, and an inlet of the third coil 11 is connected with the third heating branch 23 through a second electromagnetic valve 8; the outlet pipeline of the water tank heating pipeline 14 is divided into a first outlet branch 24, a second outlet branch 25 and a third outlet branch 26, the outlet of the first coil 9 is connected with the first outlet branch 24 through a first check valve 12, the outlet of the second coil 10 is connected with the second outlet branch 25, and the third coil 11 is connected with the third outlet branch 26 through a second check valve 13; the outlet pipeline of the water tank heating pipeline 14 is connected with the inlet of the throttle valve 4, the outlet of the throttle valve 4 is connected with the inlet of the evaporator 3, the outlet of the evaporator 3 is connected with the air suction port of the compressor 1, and the air outlet of the compressor 1 is connected with the inlet pipeline of the water tank heating pipeline 14.

The first coil, the second coil and the third coil are in surface contact with the outer surface of the water tank, and the coil form can be D-shaped or rectangular.

The number of turns of the first coil pipe, the second coil pipe and the third coil pipe on the outer surface of the water tank is 2, 4, 6, 8, 10, 12, 14, 16, 18 or 20. The preferred number of turns is 6.

The invention has the characteristics and beneficial effects that: the water heater can meet the requirements of users on different water consumption and different hot water temperatures by dividing the water tank heating coil into a first heating branch, a second heating branch and a third heating branch, respectively arranging a first electromagnetic valve and a second electromagnetic valve between the first heating branch and the first coil, and between the third heating branch and the third coil, and controlling the opening and closing of the electromagnetic valves according to the requirements of the users, so that the water heater can reduce the running energy consumption of the heat pump water heater and reduce the waste of water resources and energy resources; and the winding positions of the three coil pipes on the water tank are relatively staggered, so that the heat pump system can realize a half-container rapid layering heating mode, a whole-container rapid uniform heating mode and a whole-container rapid uniform heating mode according to the requirements of users on the basis of the control, the energy efficiency ratio of the whole heating cycle is improved, and the heating rate is high.

Drawings

FIG. 1 is a schematic system diagram of a layered circulation heating system of a heat pump water heater according to the present invention;

fig. 2 is a schematic diagram of the inlet branch and the outlet branch of the tank heating circuit 14;

in the figure: 1. the system comprises a compressor, a fan, an evaporator, a throttle valve, a controller, a water tank, a first electromagnetic valve, a second electromagnetic valve, a first coil, a second coil, a third coil, a first check valve, a second check valve and a water tank heating pipeline, wherein the fan is 2, the evaporator is 3, the throttle valve is 4, the controller is 5, the water tank is 6, the first electromagnetic valve is 7, the second electromagnetic valve is 8, the first coil is 9, the second coil is 10, the third coil is 11, the first check valve is 12, the second check valve is 13, and the water tank heating pipeline is 14.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples.

Referring to fig. 1, the layered heating mode and circulation system of a heat pump water heater of the present invention includes a compressor 1, a fan 2, an evaporator 3, a throttle valve 4, a controller 5, a water tank 6, a first solenoid valve 7, a second solenoid valve 8, a first coil 9, a second coil 10, a third coil 11, a first check valve 12, a second check valve 13, and a water tank heating pipeline 14.

The invention relates to a layered circulation heating system of a heat pump water heater, which comprises a water tank 6, a first coil pipe 9, a second coil pipe 10, a third coil pipe 11 and a water tank heating pipeline 14. The first coil pipe 9, the second coil pipe 10 and the third coil pipe 11 are in close contact with the outer surface of the water tank by smearing heat-conducting silicone grease, the contact form is surface contact, the first coil pipe 9, the second coil pipe 10 and the third coil pipe 11 can be D-shaped pipelines or rectangular pipelines, and the coil pipes can be copper pipes or aluminum pipes. The number of winding turns of the first coil 9, the second coil 10 and the third coil 11 can be 2 turns, 4 turns, 6 turns, 8 turns, 10 turns, 12 turns, 14 turns, 16 turns, 18 turns and 20 turns respectively, and in this embodiment, the number of winding turns of each coil is preferably 6 turns. The relative positions of the three coil pipes are respectively as follows: the first coil 9 is located at the upper part of the water tank 6, the second coil 10 is located at the middle part of the water tank 6, the third coil 11 is located at the lower part of the water tank 6, the first coil 9 overlaps with two thirds of the second coil 10, the second coil 10 overlaps with two thirds of the third coil 11, and the first coil 9 overlaps with one third of the third coil 11; further, the first coil 9 starts from the upper part of the water tank, the second coil 10 starts from a third position of the first coil 9, the third coil 11 starts from a third position of the second coil 10, the first coil 9 ends at a two-thirds position of the second coil 10, the second coil 10 ends at a two-thirds position of the third coil 11, and the third coil 11 ends at the bottom of the water tank 6. The inlet pipeline of the water tank heating pipeline 14 is divided into a first heating branch 21, a second heating branch 22 and a third heating branch 23, the inlet of the first coil 9 is connected with the first heating branch 21 through the first electromagnetic valve 7, the inlet of the second coil 10 is connected with the second heating branch 22, and the inlet of the third coil 11 is connected with the third heating branch 23 through the second electromagnetic valve 8. The outlet pipeline of the water tank heating pipeline 14 is divided into an outlet branch 24, a branch 25 and a branch 26, the outlet of the first coil 9 is connected with the branch 24 through the first one-way valve 12, the outlet of the second coil 10 is connected with the branch 25, and the third coil 11 is connected with the branch 26 through the second one-way valve 13. The outlet pipeline of the water tank heating pipeline 14 is connected with the inlet of the throttle valve 4, the outlet of the throttle valve 4 is connected with the inlet of the evaporator 3, the outlet of the evaporator 3 is connected with the air suction port of the compressor 1, and the air exhaust port of the compressor 1 is connected with the inlet pipeline of the water tank heating pipeline 14.

Example (b): after the system is started, under the action of the fan 2, the refrigerant in the evaporator 3 absorbs heat energy in air flowing through to evaporate, the evaporated refrigerant is absorbed and compressed by the compressor 1 to become a high-temperature and high-pressure refrigerant, the high-temperature and high-pressure refrigerant enters the condensing coil pipe along with the high-temperature and high-pressure refrigerant and releases heat to heat cold water to realize the function of heating water by the heat pump, and the condensed high-pressure refrigerant is throttled and depressurized by the throttle valve 4 to become a two-phase state and then enters the evaporator 3 to complete refrigerant circulation. According to different use requirements of users, the following four operation modes can be realized by controlling the opening and closing of the electromagnetic valve in the embodiment:

operation mode 1: a normal heating mode. When the controller 5 obtains a common heating instruction, the first electromagnetic valve 7 and the second electromagnetic valve 8 are closed, and the high-temperature and high-pressure gas discharged from the compressor 1 enters the second coil 10 through the second heating branch 22 of the water tank heating pipeline 14 to be condensed and release high-temperature sensible heat and latent heat to heat part of water in the water tank. The condensed high-pressure refrigerant enters the throttle valve 4 through the outlet branch 25, is throttled and depressurized by the throttle valve 4, and then enters the evaporator 3 to absorb air heat energy to complete the heating process. The cold water in the water tank is heated into high-temperature water by high-temperature sensible heat and latent heat rapid heating of condensation release, and the cold water of water tank upper portion and bottom is not heated this moment, and the water that is heated is toward the cold water heat transfer of upper portion and bottom, and the temperature and the density of water are the inverse ratio, therefore hot water up flows under the effect of buoyancy lift, and cold water flows down under the action of gravity, and the cold water on upper portion and the hot water below accelerate thermal exchange under the effect of mixed flow, and the water of whole water tank is heated fast. The coil pipe that the use part was coiled on the water tank heats the water of whole water tank, subtracts the short refrigerant pipeline, reduces the refrigerant loss, reduces heat pump water heater operation energy consumption, reduces the waste of the energy simultaneously.

Operation mode 2: half courage quick layering heating mode. When the controller 5 obtains a half-liner rapid layered heating instruction, the first electromagnetic valve 7 is opened, the second electromagnetic valve 8 is closed, high-temperature and high-pressure gas discharged by the compressor 1 enters the first heating branch 21 and the second heating branch 22 through the water tank heating pipeline 14, the first heating branch 21 is connected with an inlet of the first coil 9 through the first electromagnetic valve 7, the second heating branch 22 is connected with an inlet of the second coil 10, and a refrigerant is condensed in the first coil 9 and the second coil 10 and releases high-temperature sensible heat and latent heat to heat part of water in the water tank respectively. The condensed high-pressure refrigerant enters the throttle valve 4 through two

outlet branches

24 and 25 of the water tank heating pipeline 14, wherein the outlet of the first coil pipe 9 is connected with the outlet branch 24 through the one-way valve 12, and the outlet of the second coil pipe 10 is connected with the branch 25. The refrigerant is throttled and depressurized by the throttle valve 4 and then enters the evaporator 3 to absorb the heat energy of the air to complete the heating process. The water in the water tank is firstly heated by the high-temperature sensible heat of the refrigerant in the first coil pipe and the second coil pipe and then heated by the latent heat, the first coil pipe 9 starts from the upper part of the water tank, the second coil pipe 10 starts from the 9 third position of the first coil pipe, the first coil pipe 9 ends from the 10 two thirds position of the second coil pipe and ends from the 11 two thirds position of the third coil pipe, therefore, the water in the water tank is sequentially heated by the sensible heat of the first coil pipe, the sensible heat of the first coil pipe and the second coil pipe, the sensible heat of the second coil pipe and the latent heat of the first coil pipe and the heating of the second coil pipe from the top to the 10 end of the second coil pipe. The temperature of water in the water tank from top to bottom forms high-to-low temperature distribution, and the temperature and the density of water are inversely proportional, and obvious temperature stratification is formed in the water tank under the effect of buoyancy lift, which is respectively as follows: the hot water on the upper part of the water tank heated by the double-coil high-temperature sensible heat and the relatively low-temperature water heated by the double-coil latent heat form obvious temperature stratification, the water heated by the double-coil latent heat and the water heated by the single-coil latent heat at the bottom of the second coil form obvious temperature stratification, and the water at the bottom of the second coil and the water at the bottommost of the water tank form temperature stratification without heating. In the mode, users can respectively extract water with different use temperatures from different temperature layers.

Operation mode 3: heating mode is rapidly and uniformly performed on the whole container. When the controller 5 obtains a rapid and uniform heating instruction of the whole liner, the first electromagnetic valve 7 is closed, the second electromagnetic valve 8 is opened, high-temperature and high-pressure gas discharged by the compressor 1 respectively enters the second heating branch 22 and the third heating branch 23 through the water tank heating pipeline 14, the second heating branch 22 is connected with an inlet of the second coil 10, the third heating branch 23 is connected with an inlet of the third coil 11 through the second electromagnetic valve 8, and a refrigerant is condensed in the second coil 10 and the third coil 11 and respectively releases high-temperature sensible heat and latent heat to heat part of water in the water tank. The condensed high-pressure refrigerant enters the throttle valve 4 through two

outlet branches

25 and 26 of the water tank heating pipeline 14, wherein an outlet of the second coil 10 is connected with the outlet branch 25, and an outlet of the third coil 11 is connected with the branch 26 through the second check valve 13. The refrigerant is throttled and depressurized by the throttle valve 4 and then enters the evaporator 3 to absorb the heat energy of the air to complete the heating process. The water in the water tank is heated by the high-temperature sensible heat of the refrigerant in the second coil pipe and the third coil pipe and then by the latent heat. Different from the operation mode 2, in the operation mode 2, the cold water at the bottom of the water tank is not heated, and in the operation mode, the cold water at the upper part of the water tank is not heated, and the water temperature distribution gradient from the upper part to the bottom water tank is the cold water which is not heated, the hot water which is heated by the high-temperature sensible heat of the double coils and the hot water which is heated by the latent heat. Middle high-temperature water transfers heat to both sides to up flow under the buoyancy lift effect, upper portion cold water because density is high, down flow under the effect of gravity and middle water form the vortex, the heat transfer accelerates, whole water tank fast water under the heating of two coil pipes reaches even temperature. This mode is suitable for a user who uses a large amount of water and quickly prepares hot water, compared with the first mode.

Operation mode 4: and (5) heating the whole container at a high speed and a high temperature. When the controller 5 obtains a command of rapid high-temperature heating of the whole container, the first electromagnetic valve 7 is closed, the second electromagnetic valve 8 is opened, high-temperature and high-pressure gas discharged from the compressor 1 enters the first heating branch 21, the second heating branch 22 and the third heating branch 23 through the water tank heating pipeline 14, the first heating branch 21 is connected with an inlet of the first coil 9 through the first electromagnetic valve 7, the second heating branch 22 is connected with an inlet of the second coil 10, the third heating branch 23 is connected with an inlet of the third coil 11 through the second electromagnetic valve 8, and a refrigerant is condensed in the first coil 9, the second coil 10 and the third coil 11 and releases water in the high-temperature sensible heat and latent heat heating tank water respectively. The condensed high-pressure refrigerant enters the throttle valve 4 through an outlet branch 24, a branch 25 and a branch 26 of the water tank heating pipeline 14, wherein an outlet of the first coil 9 is connected with the outlet branch 24 through the first check valve 12, an outlet of the second coil 10 is connected with the outlet branch 25, and an outlet of the third coil 11 is connected with the branch 26 through the second check valve 13. The refrigerant is throttled and depressurized by the throttle valve 4 and then enters the evaporator 3 to absorb the heat energy of the air to complete the heating process. The three coil relative positions are that the first coil 9 is located above the second coil 10, the first coil 9 starts from the upper part of the water tank, the second coil 10 starts from one third of the first coil 9, the first coil 9 ends at two thirds of the second coil 10, the second coil 10 is located above the third coil 11 and ends at two thirds of the third coil 11, the third coil 11 starts at one third of the second coil 10, and the third coil 11 ends at the bottom of the water tank. When the three coils run simultaneously, the water in the water tank is heated from the 9 third position of the first coil to the 11 two thirds position of the third coil by the superposed sensible heat and latent heat released by the refrigerant to high-temperature hot water, the water tank is heated from the upper part of the water tank to the 9 third position of the first coil by the sensible heat released by the refrigerant in the first coil, and the water tank is heated from the 11 two thirds position of the third coil to the bottom of the water tank by the latent heat released by the refrigerant in the third coil 11. The overlapped part of the three coil pipes in the middle of the water tank forms temperature stratification with water at the lower part of the water tank due to high temperature, so that the utilization rate of high-quality heat is improved; and the heat exchange is carried out with the water on the upper part of the water tank to form uniform high-temperature water. The mode is used for quickly preparing water with large water consumption and high or low water temperature, and provides a convenient choice for simultaneously utilizing high-temperature water and low-temperature water for users.

Claims

1. A layered circulation heating system of a heat pump water heater is characterized by comprising a water tank, a first coil pipe, a second coil pipe, a third coil pipe and a water tank heating pipeline; the first coil pipe, the second coil pipe and the third coil pipe are in close contact with the outer surface of the water tank through heat-conducting silicone grease, the first coil pipe is positioned at the upper part of the water tank, the second coil pipe is positioned at the middle part of the water tank, the third coil pipe is positioned at the lower part of the water tank, the first coil pipe is overlapped with two thirds of the second coil pipe, the second coil pipe is overlapped with two thirds of the third coil pipe, and the first coil pipe is overlapped with one third of the third coil pipe; the first coil pipe starts from the upper part of the water tank, the second coil pipe starts from the one third position of the first coil pipe, the third coil pipe starts from the one third position of the second coil pipe, the first coil pipe ends at the two thirds position of the second coil pipe, the second coil pipe ends at the two thirds position of the third coil pipe, and the third coil pipe ends at the bottom of the water tank; the outlet pipeline of the water tank heating pipeline is divided into a first outlet branch, a second outlet branch and a third outlet branch, the outlet of the first coil is connected with the first outlet branch through a first one-way valve, the outlet of the second coil is connected with the second outlet branch through a second one-way valve, the outlet of the second coil is connected with the second outlet branch, and the third coil is connected with the third outlet branch through a second one-way valve; an outlet pipeline of the water tank heating pipeline is connected with an inlet of a throttle valve, an outlet of the throttle valve is connected with an inlet of an evaporator, an outlet of the evaporator is connected with an air suction port of a compressor, and an air exhaust port of the compressor is connected with an inlet pipeline of the water tank heating pipeline;

the first coil, the second coil and the third coil are in surface contact with the outer surface of the water tank, and the coil form can be D-shaped or rectangular;

the first coil pipe, the second coil pipe and the third coil pipe are wound on the outer surface of the water tank in the same number of turns, namely 2 turns, 4 turns, 6 turns, 8 turns, 10 turns, 12 turns, 14 turns, 16 turns, 18 turns or 20 turns.

2. The layered circulation heating system of the heat pump water heater as claimed in claim 1, wherein the first coil, the second coil and the third coil are wound on the outer surface of the water tank for 6 turns.