CN112665183A - Air source heat pump double-water-tank hot water system and control method thereof - Google Patents
Air source heat pump double-water-tank hot water system and control method thereof Download PDFInfo
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Abstract
The invention relates to an air source heat pump double-water-tank hot water system and a control method, comprising a variable frequency water supply pump, a hot water tank, a warm water tank, a parallel host, a water return valve and a water replenishing valve, wherein the variable frequency water supply pump, the hot water tank, the warm water tank and the parallel host are connected in sequence; the hot water tank, the warm water tank and the parallel host are sequentially connected to form a host-water tank circulation; the warm water tank, the hot water tank, the variable-frequency water supply pump and the water return valve are sequentially connected to form a water tank-tail end circulation; the parallel host comprises a plurality of parallel branches which are independently controlled or not, and different heat supply modes are realized by starting a specific number of parallel branches, so that different end load requirements are matched. Compared with the prior art, the double-water-tank scheme is adopted, so that the mixing loss among return water, water supplement and hot water is reduced, the water inlet temperature and the water outlet temperature of the heat pump are reduced, the condensation temperature of the heat pump can be well reduced, the water consumption of a user is guaranteed, and the energy efficiency of the heat pump unit is improved.
Description
Technical Field
The invention relates to a hot water system and a control method thereof, in particular to a double-water-tank hot water system of an air source heat pump and a control method thereof.
Background
Currently, large and medium-sized buildings (e.g., office buildings, hospitals, dormitory buildings, teaching buildings, etc.) often use centralized heating zone systems to provide domestic hot water. The system takes a certain building or a certain district building as a unit and takes a medium-large heat storage water tank as a main part to intensively and uniformly provide a heat source to form a central hot water supply station. The central hot water supply station sends hot water to each subarea through a hot water pipeline in a net-shaped layout, and then sends the hot water to each water distribution point through a transmission and distribution pipeline of each subarea. With the attention of people on energy conservation and environmental protection in recent years, the air source heat pump is a reliable choice for a heat source of a hot water system due to the characteristics of environmental friendliness, high efficiency and the like.
The existing domestic hot water system of the building mostly adopts a secondary circulation system, namely a main machine-water tank circulation system and a water tank-tail end circulation system. Specifically, an air source heat pump host in the hot water system heats a hot water tank, so that water in the water tank keeps high temperature, and a tail end pipe network takes hot water from the hot water tank and sends the hot water to each water distribution point.
The hot water demand of a user needs to satisfy two aspects of water temperature and water quantity at the same time: when the temperature of water in the hot water tank drops, the heat pump main machine is triggered to circularly heat until the set hot water temperature is reached; when the water level of the hot water tank drops, the water supplementing pipeline is triggered to supplement water until the set water level of the water tank is reached.
In practical use, most of the existing heat pump hot water systems have the following three problems: firstly, high-temperature hot water (about 55 ℃) prepared by a heat pump, medium-temperature return water (about 40 ℃) of a tail end pipe network and low-temperature cold water (about 15 ℃) of a water supply pipeline are uniformly fed into a hot water tank, and mixed water loss exists; secondly, a plurality of heat pump main machines and a heat collecting water pump use the same controller, and can only be started and stopped integrally, which is not beneficial to unit control under partial load and has large start and stop loss; thirdly, in order to resist the temperature drop of mixed water and avoid frequent start and stop, the heat pump host needs to supply higher water temperature (about 55 ℃) to deal with terminal water supply (about 50 ℃), the high water supply temperature improves the condensation temperature of the unit, and the energy efficiency of the heat pump host is reduced.
The prior patent CN205481742U provides a constant-temperature and constant-pressure hot water supply system combining an air source heat pump unit and two water tanks, and the effect of the combined operation of the air source heat pump unit, a heating water tank and a heat preservation water tank is realized through valve control; the prior patent CN207422669U proposes a double-water-tank air source heat pump system, which utilizes auxiliary electric heating to resist extreme load; the prior patent CN211204209U provides a double-source double-water-tank heat pump water supply system, which realizes energy conservation by using a water source heat pump to supply heat when a main heat source is insufficient through a heat storage water tank. The double-water-tank system used in the patent only divides the water tank into a main water tank and an auxiliary water tank, the heat pump only heats one of the water tanks at each time, the water temperature is guaranteed and the energy consumption is saved by utilizing a peak-shifting storage mode, the advantages of the double-water-tank system are not really exerted, and meanwhile, the situation that a plurality of heat pumps are started and stopped simultaneously is not considered in the patent.
Disclosure of Invention
The technical scheme is characterized in that a double-water-tank scheme is arranged, so that the mixing loss among return water, water supplement and hot water is reduced, the water inlet temperature and the water outlet temperature of the heat pump are reduced, the condensation temperature of the heat pump can be well reduced, the water consumption of a user is guaranteed, and the energy efficiency of the heat pump unit is improved.
The purpose of the invention can be realized by the following technical scheme:
the invention aims to protect an air source heat pump double-water-tank hot water system, which comprises a variable-frequency water supply pump, a hot water tank, a warm water tank, a parallel host, a water return valve and a water supplementing valve, wherein the variable-frequency water supply pump, the hot water tank, the warm water tank and the parallel host are sequentially connected;
the hot water tank, the warm water tank and the parallel host are sequentially connected to form a host-water tank circulation;
the warm water tank, the hot water tank, the variable-frequency water supply pump and the water return valve are sequentially connected to form a water tank-tail end circulation;
the parallel host comprises a plurality of parallel branches which are independently controlled or not, and different heat supply modes are realized by starting a specific number of parallel branches, so that different end load requirements are matched.
Furthermore, the outlet of the variable-frequency water supply pump is connected with a water supply tail end, and water in the warm water tank is obtained by mixing tail end backwater and cold water replenishing water.
As a first embodiment of the present invention, the parallel master includes a first parallel branch and a second parallel branch;
and the first parallel branch and the second parallel branch are respectively provided with a first butterfly valve and a second butterfly valve, and the first parallel branch and the second parallel branch are controlled to be opened and closed through the first butterfly valve and the second butterfly valve.
Furthermore, the first parallel branch further comprises a first constant-frequency circulating pump and a first air source heat pump which are connected with each other, the first constant-frequency circulating pump is connected with a first butterfly valve, and the first air source heat pump is further connected with a hot water tank.
Furthermore, the second parallel branch further comprises a parallel unit and a second constant-frequency circulating pump which are connected with each other, the parallel unit is composed of a plurality of air source heat pumps which are connected in parallel, the parallel unit is connected with the second constant-frequency circulating pump, and the parallel unit is further connected with the hot water tank.
As a second embodiment of the present invention, the parallel main unit includes a parallel unit, a constant frequency circulating pump, and a butterfly valve, which are connected to each other, the butterfly valve is connected to the warm water tank, and the parallel unit is connected to the hot water tank.
Further, the parallel unit is composed of a plurality of parallel branches.
Furthermore, a return water temperature measuring point is arranged at the inlet end of the return valve, a water tank temperature measuring point is arranged in the hot water tank, and a water level measuring point is arranged in the warm water tank.
Furthermore, a connecting pipe is arranged between the hot water tank and the warm water tank and is positioned in the middle of the two water tanks.
Furthermore, temperature sensors are arranged at the return water temperature measuring point and the water tank temperature measuring point, water level sensors are arranged at the water level measuring point, and each temperature sensor and each water level sensor are electrically connected with an external computer terminal and display the state of each parameter in real time through a human-computer interaction interface.
The first purpose of the invention is to protect a control method of an air source heat pump double-water-tank hot water system, which is characterized by comprising the following steps:
when in the low-load heating mode:
in the first parallel branch, a first air source heat pump is started, a first constant frequency circulating pump is started, a first butterfly valve is started,
in the second parallel branch, a second air source heat pump is closed, a third air source heat pump is closed, a second constant-frequency circulating pump is closed, and a second butterfly valve is closed;
when in the medium load heating mode:
in the first parallel branch, the first air source heat pump is closed, the first constant frequency circulating pump is closed, the first butterfly valve is closed,
in the second parallel branch, a second air source heat pump is started, a third air source heat pump is started, a second constant-frequency circulating pump is started, and a second butterfly valve is started;
when the system is in a high-load heating mode or a peak period advanced heat storage mode:
in the first parallel branch, a first air source heat pump is started, a first constant frequency circulating pump is started, a first butterfly valve is started,
and in the second parallel branch, a second air source heat pump is started, a third air source heat pump is started, a second constant-frequency circulating pump is started, and a second butterfly valve is started.
Further, when the water tank is in a low-load heat supply mode, a medium-load heat supply mode or a high-load heat supply mode, a second temperature feedback threshold value is preset in the hot water tank, when the temperature value exceeds the second temperature feedback threshold value, the air source heat pumps, the corresponding fixed-frequency circulating pumps and the valve pieces in the parallel branches are closed, when the water level in the water tank is lower than a set water level threshold value, a water supplementing valve is opened for supplementing water, and when the return water temperature is lower than a set return water temperature threshold value, a return water valve is opened for returning water;
when the water tank is in a peak period advanced heat storage mode, the air source heat pumps, the corresponding fixed-frequency circulating pumps and the valve elements in all the parallel branches are started, a first temperature feedback threshold value is preset in the water tank, the air source heat pumps, the corresponding fixed-frequency circulating pumps and the valve elements in all the parallel branches are closed when the temperature value exceeds the first temperature feedback threshold value, a water supplementing valve is started to supplement water when the water level in the water tank is lower than a set water level threshold value, and a water returning valve is started to return water when the water returning temperature is lower than a set water returning temperature threshold value.
Compared with the prior art, the invention has the following technical advantages:
1. compared with a single-water-tank hot water system, the technical scheme reduces the mixing loss among return water, water supplement and hot water by arranging the double-water-tank scheme, and is favorable for energy conservation.
2. Compare with current two water tank hot water system, this technical scheme cavity air supply heat pump sends into the hot-water tank with the water heating in the warm water tank, reduces heat pump inlet water and the temperature of leaving water simultaneously, can reduce heat pump condensation temperature well, improves heat pump set's efficiency.
3. According to the technical scheme, the air source heat pump units are orderly connected in parallel, the starting and stopping effects of different numbers of air source heat pump units can be realized, the requirements under different heat supply loads are met, and the energy consumption loss of the whole starting and stopping is reduced.
Drawings
Fig. 1 is a schematic structural view of embodiment 1.
In the figure: 1-1-a hot water tank; 1-2-a warm water tank; 1-3-a first air source heat pump; 1-4-a first constant frequency circulation pump; 1-5-a first butterfly valve; 1-6-a second air source heat pump; 1-7-a third air source heat pump; 1-8-a second fixed-frequency cycle heat pump; 1-9-a second butterfly valve; 1-10-variable frequency water supply pump; 1-11 to 1-18-connecting pipes; 1-23-measuring the temperature of the water tank; 1-19-1-31-connecting pipe; 1-32-water level measuring points; 1-33-a water return valve; 1-34-water replenishing valve; 1-35-water return temperature measuring point.
Fig. 2 is a schematic structural view of embodiment 2.
In the figure: 2-1-hot water tank; 2-2-a warm water tank; 2-3-a first air source heat pump; 2-4-a second air source heat pump; 2-5-a third air source heat pump; 2-6-fixed frequency circulating pump; 2-7-butterfly valve; 2-8-a backwater temperature measuring point; 2-9-measuring the temperature of the water tank; 2-10-variable frequency water supply pump; 2-11 to 2-26-connecting pipes; 2-27-a water return valve; 2-28-water replenishing valve; 2-29-water temperature measuring point.
Detailed Description
The core innovation point of the technical scheme is as follows: the hot water tank and the warm water tank are separated, so that the heat dissipation loss of the water tank and the heat loss of direct mixing of different water temperatures are reduced; the water supply of the heat pump is provided by a warm water tank, the water output by the heat pump is sent into the hot water tank, the water in the warm water tank is mixed by the return water at the tail end and the supplemented water of cold water (which is less than the water temperature of the hot water supply when the previous single water tank is heated circularly), the water inlet temperature of the heat pump host can be reduced, the water output by the heat pump is sent into the hot water tank, the water in the hot water tank is directly sent to the tail end without being mixed with water, the water output temperature of the heat pump can be reduced, the condensation; for a large system requiring a plurality of heat pumps, a plurality of groups of modes of parallel connection and grouped start and stop are implemented to meet the heat supply requirements under different loads, and the energy consumption caused by the loss of the whole start and stop is reduced.
The air source hot water double-water tank hot water system has four working modes, namely a low-load heat supply mode, a medium-load heat supply mode, a high-load heat supply mode and a peak period advanced heat storage mode. The first three modes are respectively used when different heat supply needs are needed at the tail end, and the advanced heat storage mode at the peak period is used before the peak of heat utilization when the load at the tail end is very large in extreme weather.
In the low-load heating mode, the first air source heat pump is started, the first fixed-frequency circulating pump is started, the first butterfly valve is started, the second air source heat pump is closed, the third air source heat pump is closed, the second fixed-frequency circulating pump is closed, and the second butterfly valve is closed. The water temperature of the water tank is set according to the heat supply requirement (for example, 50 ℃).
In the medium load heating mode, the first air source heat pump is closed, the first fixed-frequency circulating pump is closed, the first butterfly valve is closed, the second air source heat pump is opened, the third air source heat pump is opened, the second fixed-frequency circulating pump is opened, and the second butterfly valve is opened. The water temperature of the water tank is set according to the heat supply requirement (for example, 50 ℃).
In the high-load heating mode, a first air source heat pump is started, a first constant-frequency circulating pump is started, a first butterfly valve is started, a second air source heat pump is started, a third air source heat pump is started, a second constant-frequency circulating pump is started, and a second butterfly valve is started. The water temperature of the water tank is set according to the heat supply requirement (for example, 50 ℃).
In the advanced heat storage mode in the peak period, the first air source heat pump is started, the first fixed-frequency circulating pump is started, the first butterfly valve is started, the second air source heat pump is started, the third air source heat pump is started, the second fixed-frequency circulating pump is started, and the second butterfly valve is started. The water temperature in the water tank is higher than the water temperature setting (for example 55 ℃) required by heat supply.
An air source hot water double-water tank hot water system is characterized in that under a low-load heat supply mode, a main machine-water tank circulation is completed by one air source heat pump. And when the water temperature in the hot water tank is higher than the set temperature (the hot water tank is provided with a temperature measuring point), the air source heat pump, the corresponding fixed-frequency circulating pump and the corresponding valve are closed. And when the water level in the water tank is lower than the set water level (the warm water tank is provided with a water level measuring point), the water replenishing valve is opened to replenish water. And when the return water temperature (the return water pipe is provided with a temperature measuring point) is lower than the set return water temperature, the return water valve is opened to return water.
An air source hot water double-water-tank hot water system is characterized in that under a medium-load heat supply mode, a host machine-water-tank circulation is completed by two air source heat pumps. And when the water temperature in the hot water tank is higher than the set temperature (the hot water tank is provided with a temperature measuring point), the air source heat pump, the corresponding fixed-frequency circulating pump and the corresponding valve are closed. And when the water level in the water tank is lower than the set water level (the warm water tank is provided with a water level measuring point), the water replenishing valve is opened to replenish water. And when the return water temperature (the return water pipe is provided with a temperature measuring point) is lower than the set return water temperature, the return water valve is opened to return water.
An air source hot water double-water-tank hot water system is characterized in that under a high-load heat supply mode, three air source heat pumps complete main unit-water-tank circulation. When the temperature of the water in the hot water tank is higher than the set temperature (the hot water tank is provided with a temperature measuring point), the air source heat pump, the corresponding fixed-frequency circulating pump and the corresponding valve are closed. And when the water level in the water tank is lower than the set water level (the warm water tank is provided with a water level measuring point), the water replenishing valve is opened to replenish water. And when the return water temperature (the return water pipe is provided with a temperature measuring point) is lower than the set return water temperature, the return water valve is opened to return water.
An air source hot water double-water-tank hot water system is characterized in that under the mode of advanced heat storage in a peak period, three air source heat pumps complete host-water-tank circulation. When the temperature of the water in the hot water tank is higher than the set temperature (the hot water tank is provided with a temperature measuring point), the air source heat pump, the corresponding fixed-frequency circulating pump and the corresponding valve are closed. And when the water level in the water tank is lower than the set water level (the warm water tank is provided with a water level measuring point), the water replenishing valve is opened to replenish water. And when the return water temperature (the return water pipe is provided with a temperature measuring point) is lower than the set return water temperature, the return water valve is opened to return water.
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
The air source hot water double-water tank hot water system in the embodiment is structurally shown in figure 1, and mainly comprises a hot water tank 1-1, a warm water tank 1-2, a first air source heat pump 1-3, a first fixed frequency circulating pump 1-4, a first butterfly valve 1-5, a second air source heat pump 1-6, a third air source heat pump 1-7, a second fixed frequency circulating heat pump 1-8, a second butterfly valve 1-9, a variable frequency water supply pump 1-10, connecting pipes 1-11-1-31, water level measuring points 1-32, a water return valve 1-22, a water supply valve 1-34, water return measuring points 1-35 and a water tank temperature measuring point 1-36.
In a low-load heat supply mode, a first air source heat pump 1-3, a first fixed-frequency circulating pump 1-4, a first butterfly valve 1-5 and a variable-frequency water supply pump 1-10 are all started, and a second air source heat pump 1-6, a third air source heat pump 1-7, a second fixed-frequency circulating heat pump 1-8 and a second butterfly valve 1-9 are all closed. Temperature measuring points 1-23 monitor the water temperature in the water tank, and when the water temperature is higher than a set temperature (the water temperature in the water tank is set according to the heat supply requirement, for example, 50 ℃), the first air source heat pump 1-3, the first fixed-frequency circulating pump 1-4 and the first butterfly valve 1-5 are closed. And the water level measuring points 1-32 monitor the water level of the water tank, and when the water level in the water tank is lower than the set water level, the water replenishing valves 1-34 are opened to replenish water. And monitoring the return water temperature by temperature measuring points 1-35, and opening return water valves 1-33 to return water when the return water temperature is lower than the set return water temperature. The tail end backwater and cold water replenishing water are mixed in the warm water tank 1-2, heated in the air source heat pump 1-3 through the connecting pipe 1-17, the connecting pipe 1-19, the first butterfly valve 1-5, the connecting pipe 1-20, the first fixed frequency circulating pump 1-4 and the connecting pipe 1-21 to form hot water, and sent into the hot water tank 1-1 through the connecting pipe 1-22 and the connecting pipe 1-31. Hot water in the hot water tank 1-1 is sent to a tail end pipe network through a connecting pipe 1-11, a variable frequency water supply pump 1-10 and a connecting pipe 1-12, and reaches a tail end water distribution point through the connecting pipe 1-13 to be used by users. The unused hot water return water in the end pipe network returns to the hot water tank 1-2 through the connecting pipe 1-14 and the connecting pipe 1-16.
In the medium-load heating mode, the first air source heat pump 1-3, the first constant-frequency circulating pump 1-4 and the first butterfly valve 1-5 are all closed, and the variable-frequency water supply pump 1-10, the second air source heat pump 1-6, the third air source heat pump 1-7, the second constant-frequency circulating heat pump 1-8 and the second butterfly valve 1-9 are all opened. And temperature measuring points 1-23 monitor the water temperature in the water tank, and when the water temperature is higher than the set temperature (the water temperature in the water tank is set according to the heat supply requirement, for example, 50 ℃), the second air source heat pump 1-6, the third air source heat pump 1-7, the second fixed frequency cycle heat pump 1-8 and the second butterfly valve 1-9 are closed. And the water level measuring points 1-32 monitor the water level of the water tank, and when the water level in the water tank is lower than the set water level, the water replenishing valves 1-34 are opened to replenish water. And monitoring the return water temperature by temperature measuring points 1-35, and opening return water valves 1-33 to return water when the return water temperature is lower than the set return water temperature. The tail end returned water and the cold water replenishing water are mixed in the warm water tank 1-2, and are sent into the hot water tank 1-1 through the connecting pipe 1-17, the connecting pipe 1-18, the second butterfly valve 1-9, the connecting pipe 1-24, the second fixed-frequency circulating pump 1-8 and the connecting pipe 1-25, and are heated in the second air source heat pump 1-6 and the third air source heat pump 1-7 through the first parallel branch consisting of the connecting pipe 1-26, the second air source heat pump 1-6 and the connecting pipe 1-29 and the second parallel branch consisting of the connecting pipe 1-27, the third air source heat pump 1-7 and the connecting pipe 1-28, and then are sent into the hot water tank 1-1 through the connecting pipe 1-30 and the connecting pipe 1-31. Hot water in the hot water tank 1-1 is sent to a tail end pipe network through a connecting pipe 1-11, a variable frequency water supply pump 1-10 and a connecting pipe 1-12, and reaches a tail end water distribution point through the connecting pipe 1-13 to be used by users. The unused hot water return water in the end pipe network returns to the hot water tank 1-2 through the connecting pipe 1-14 and the connecting pipe 1-16.
In a high-load heating mode, a first air source heat pump 1-3, a first fixed-frequency circulating pump 1-4, a first butterfly valve 1-5, a variable-frequency water supply pump 1-10, a second air source heat pump 1-6, a third air source heat pump 1-7, a second fixed-frequency circulating heat pump 1-8 and a second butterfly valve 1-9 are all started. Temperature measuring points 1-23 monitor the water temperature in the water tank, and when the water temperature is higher than a set temperature (the water temperature in the water tank is set according to the heat supply requirement, for example, 50 ℃), a first air source heat pump 1-3, a first fixed frequency circulating pump 1-4, a first butterfly valve 1-5, a second air source heat pump 1-6, a third air source heat pump 1-7, a second fixed frequency circulating heat pump 1-8 and a second butterfly valve 1-9 are closed. And the water level measuring points 1-32 monitor the water level of the water tank, and when the water level in the water tank is lower than the set water level, the water replenishing valves 1-34 are opened to replenish water. And monitoring the return water temperature by temperature measuring points 1-35, and opening return water valves 1-33 to return water when the return water temperature is lower than the set return water temperature. The tail end return water and cold water replenishing water are mixed in a warm water tank 1-2 and are sent into a first parallel branch consisting of a connecting pipe 1-19, a first butterfly valve 1-5, a connecting pipe 1-20, a first fixed frequency circulating pump 1-4, a connecting pipe 1-21, a first air source heat pump 1-3 and a connecting pipe 1-22 and a second parallel branch consisting of a connecting pipe 1-18, a connecting pipe 1-24, a second fixed frequency circulating pump 1-8, a connecting pipe 1-25, a connecting pipe 1-26, a second air source heat pump 1-6, a connecting pipe 1-29, a connecting pipe 1-27, a third air source heat pump 1-7, a parallel flow path of the connecting pipe 1-28 and a connecting pipe 1-30 through connecting pipes 1-17 and 1-17 of the first air source heat pump, After being heated in the second air source heat pump 1-6 and the third air source heat pump 1-7, the heated air is sent into the hot water tank 1-1 through the connecting pipe 1-31. Hot water in the hot water tank 1-1 is sent to a tail end pipe network through a connecting pipe 1-11, a variable frequency water supply pump 1-10 and a connecting pipe 1-12, and reaches a tail end water distribution point through the connecting pipe 1-13 to be used by users. The unused hot water return water in the end pipe network returns to the hot water tank 1-2 through the connecting pipe 1-14 and the connecting pipe 1-16.
In the advanced heat storage mode in the peak period, a first air source heat pump 1-3, a first fixed-frequency circulating pump 1-4, a first butterfly valve 1-5, a variable-frequency water supply pump 1-10, a second air source heat pump 1-6, a third air source heat pump 1-7, a second fixed-frequency circulating heat pump 1-8 and a second butterfly valve 1-9 are all started. Temperature measuring points 1-23 monitor the water temperature in the water tank, and when the water temperature is higher than a set temperature (the water temperature in the water tank is higher than the water temperature required by heat supply, such as 55 ℃), a first air source heat pump 1-3, a first fixed frequency circulating pump 1-4, a first butterfly valve 1-5, a second air source heat pump 1-6, a third air source heat pump 1-7, a second fixed frequency circulating heat pump 1-8 and a second butterfly valve 1-9 are closed. And the water level measuring points 1-32 monitor the water level of the water tank, and when the water level in the water tank is lower than the set water level, the water replenishing valves 1-34 are opened to replenish water. And monitoring the return water temperature by temperature measuring points 1-35, and opening return water valves 1-33 to return water when the return water temperature is lower than the set return water temperature. The tail end return water and cold water replenishing water are mixed in a warm water tank 1-2 and are sent into a first parallel branch consisting of a connecting pipe 1-19, a first butterfly valve 1-5, a connecting pipe 1-20, a first fixed frequency circulating pump 1-4, a connecting pipe 1-21, a first air source heat pump 1-3 and a connecting pipe 1-22 and a second parallel branch consisting of a connecting pipe 1-18, a connecting pipe 1-24, a second fixed frequency circulating pump 1-8, a connecting pipe 1-25, a connecting pipe 1-26, a second air source heat pump 1-6, a connecting pipe 1-29, a connecting pipe 1-27, a third air source heat pump 1-7, a parallel flow path of the connecting pipe 1-28 and a connecting pipe 1-30 through connecting pipes 1-17 and 1-17 of the first air source heat pump, After being heated in the second air source heat pump 1-6 and the third air source heat pump 1-7, the heated air is sent into the hot water tank 1-1 through the connecting pipe 1-31. Hot water in the hot water tank 1-1 is sent to a tail end pipe network through a connecting pipe 1-11, a variable frequency water supply pump 1-10 and a connecting pipe 1-12, and reaches a tail end water distribution point through the connecting pipe 1-13 to be used by users. The unused hot water return water in the end pipe network returns to the hot water tank 1-2 through the connecting pipe 1-14 and the connecting pipe 1-16.
Example 2
In the embodiment of the air source hot water dual-water-tank hot water system, if the grouped start-stop cannot be realized and only the integral start-stop can be realized, the structure is shown in fig. 2, and the main structure comprises a hot water tank 2-1, a warm water tank 2-2, a first air source heat pump 2-3, a second air source heat pump 2-4, a third air source heat pump 2-5, a fixed-frequency circulating pump 2-6, a butterfly valve 2-7, a return water temperature measuring point 2-8, a water tank temperature measuring point 2-9, a variable-frequency water supply pump 2-10, connecting pipes 2-11-2-26, a return water valve 2-27, a water replenishing valve 2-28 and a water temperature measuring point 2-29.
Because the unit can not be divided into groups to start and stop, the heat supply modes of different loads can not be realized, and only a general heat supply mode and a peak period advanced heat storage mode are left.
In a general heating mode, a first air source heat pump 2-3, a second air source heat pump 2-4, a third air source heat pump 2-5, a variable frequency water supply pump 2-10 and a butterfly valve 2-7 are all opened. And a temperature measuring point 2-9 monitors the water temperature in the water tank, and when the water temperature is higher than a set temperature (the water temperature of the water tank is set according to the heat supply requirement, for example, 50 ℃), the first air source heat pump 2-3, the second air source heat pump 2-4, the third air source heat pump 2-5 and the butterfly valve 2-7 are closed. And the water level measuring points 2-29 monitor the water level of the water tank, and when the water level in the water tank is lower than the set water level, the water replenishing valves 2-27 are opened to replenish water. And monitoring the return water temperature by a temperature measuring point 2-8, and opening a return water valve 2-33 to return water when the return water temperature is lower than the set return water temperature. The tail end backwater and cold water replenishing water are mixed in a warm water tank 2-2, and pass through a connecting pipe 2-17, a butterfly valve 2-7, a connecting pipe 2-18, a fixed frequency circulating pump 2-6, a connecting pipe 2-19, a first parallel branch consisting of a connecting pipe 2-20, a first air source heat pump 2-3 and a connecting pipe 2-23, a second parallel branch consisting of a connecting pipe 2-21, a second air source heat pump 2-4 and a connecting pipe 2-24, a third parallel branch consisting of a connecting pipe 2-22, a third air source heat pump 2-5 and a connecting pipe 2-25, and after being heated in the first air source heat pump 2-3, the second air source heat pump 2-4 and the third air source heat pump 2-5, the mixture is sent into the hot water tank 2-9 through the connecting pipe 2-26. The hot water in the hot water tank 2-1 is sent to a tail end pipe network through a connecting pipe 2-11, a variable frequency water supply pump 2-10 and a connecting pipe 2-12, and reaches a tail end water distribution point through a connecting pipe 2-13 to be used by users. The unused hot water return water in the end pipe network returns to the hot water tank 2-2 through the connecting pipe 2-14 and the connecting pipe 2-16.
And in the advanced heat storage mode in the peak period, the first air source heat pump 2-3, the second air source heat pump 2-4, the third air source heat pump 2-5, the variable frequency water supply pump 2-10 and the butterfly valve 2-7 are all opened. And a temperature measuring point 2-9 monitors the water temperature in the water tank, and when the water temperature is higher than a set temperature (the water temperature of the water tank is higher than the set heat supply required water temperature, such as 55 ℃), the first air source heat pump 2-3, the second air source heat pump 2-4, the third air source heat pump 2-5 and the butterfly valve 2-7 are closed. And the water level measuring points 2-29 monitor the water level of the water tank, and when the water level in the water tank is lower than the set water level, the water replenishing valves 2-27 are opened to replenish water. And monitoring the return water temperature by a temperature measuring point 2-8, and opening a return water valve 2-33 to return water when the return water temperature is lower than the set return water temperature. The tail end backwater and cold water replenishing water are mixed in a warm water tank 2-2, and pass through a connecting pipe 2-17, a butterfly valve 2-7, a connecting pipe 2-18, a fixed frequency circulating pump 2-6, a connecting pipe 2-19, a first parallel branch consisting of a connecting pipe 2-20, a first air source heat pump 2-3 and a connecting pipe 2-23, a second parallel branch consisting of a connecting pipe 2-21, a second air source heat pump 2-4 and a connecting pipe 2-24, a third parallel branch consisting of a connecting pipe 2-22, a third air source heat pump 2-5 and a connecting pipe 2-25, and after being heated in the first air source heat pump 2-3, the second air source heat pump 2-4 and the third air source heat pump 2-5, the mixture is sent into the hot water tank 2-9 through the connecting pipe 2-26. The hot water in the hot water tank 2-1 is sent to a tail end pipe network through a connecting pipe 2-11, a variable frequency water supply pump 2-10 and a connecting pipe 2-12, and reaches a tail end water distribution point through a connecting pipe 2-13 to be used by users. The unused hot water return water in the end pipe network returns to the hot water tank 2-2 through the connecting pipe 2-14 and the connecting pipe 2-16.
The terms "first," "second," and the like are used herein to define components, as one skilled in the art would know: the use of the words "first", "second", etc. is merely for convenience in describing the differences between the components. Unless otherwise stated, the above words have no special meaning.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The air source heat pump double-water-tank hot water system is characterized by comprising a variable-frequency water supply pump, a hot water tank, a warm water tank and a parallel host which are sequentially connected, and further comprising a water return valve and a water supplementing valve which are respectively connected with the warm water tank, wherein the water supplementing valve is connected with an external water source;
the hot water tank, the warm water tank and the parallel host are sequentially connected to form a host-water tank circulation;
the warm water tank, the hot water tank, the variable-frequency water supply pump and the water return valve are sequentially connected to form a water tank-tail end circulation;
the parallel host comprises a plurality of parallel branches which are independently controlled or not, and different heat supply modes are realized by starting a specific number of parallel branches, so that different end load requirements are matched.
2. The air source heat pump double-water-tank hot water system as claimed in claim 1, wherein a water supply end is connected to an outlet of the variable frequency water supply pump, and water in the warm water tank is obtained by mixing end backwater and cold water replenishing water.
3. The air source heat pump double-water-tank hot water system as claimed in claim 2, wherein the parallel main machine comprises a first parallel branch and a second parallel branch;
and the first parallel branch and the second parallel branch are respectively provided with a first butterfly valve and a second butterfly valve, and the first parallel branch and the second parallel branch are controlled to be opened and closed through the first butterfly valve and the second butterfly valve.
4. The air source heat pump double-water-tank hot water system as claimed in claim 3, wherein the first parallel branch further comprises a first constant-frequency circulating pump and a first air source heat pump which are connected with each other, the first constant-frequency circulating pump is connected with a first butterfly valve, and the first air source heat pump is further connected with a hot water tank.
5. The air source heat pump double-water-tank hot water system as claimed in claim 3, wherein the second parallel branch further comprises a parallel unit and a second constant-frequency circulating pump which are connected with each other, the parallel unit is composed of a plurality of air source heat pumps which are connected in parallel, the parallel unit is connected with the second constant-frequency circulating pump, and the parallel unit is further connected with a hot water tank.
6. The air source heat pump double-water-tank hot water system as claimed in claim 2, wherein the parallel main unit comprises a parallel unit, a fixed frequency circulating pump and a butterfly valve which are connected with each other, the butterfly valve is connected with the warm water tank, and the parallel unit is connected with the hot water tank.
7. The air source heat pump double-water-tank hot water system as claimed in claim 6, wherein the parallel unit is composed of a plurality of parallel branches.
8. The air source heat pump double-water-tank hot water system as claimed in claim 1, wherein a return water temperature measuring point is arranged at an inlet end of the return valve, a water tank temperature measuring point is arranged in the hot water tank, and a water level measuring point is arranged in the warm water tank.
9. A control method of an air source heat pump double-water-tank hot water system is characterized by comprising the following steps:
when in the low-load heating mode:
in the first parallel branch, a first air source heat pump is started, a first constant frequency circulating pump is started, a first butterfly valve is started,
in the second parallel branch, a second air source heat pump is closed, a third air source heat pump is closed, a second constant-frequency circulating pump is closed, and a second butterfly valve is closed;
when in the medium load heating mode:
in the first parallel branch, the first air source heat pump is closed, the first constant frequency circulating pump is closed, the first butterfly valve is closed,
in the second parallel branch, a second air source heat pump is started, a third air source heat pump is started, a second constant-frequency circulating pump is started, and a second butterfly valve is started;
when the system is in a high-load heating mode or a peak period advanced heat storage mode:
in the first parallel branch, a first air source heat pump is started, a first constant frequency circulating pump is started, a first butterfly valve is started,
and in the second parallel branch, a second air source heat pump is started, a third air source heat pump is started, a second constant-frequency circulating pump is started, and a second butterfly valve is started.
10. The control method of the air source heat pump double-water-tank hot water system according to claim 9, characterized in that when the system is in a low-load heat supply mode, a medium-load heat supply mode or a high-load heat supply mode, a second temperature feedback threshold is preset in the hot water tank, when a temperature value exceeds the second temperature feedback threshold, the air source heat pump, the corresponding fixed-frequency circulating pump and the valve element in each parallel branch are closed, when a water level in the water tank is lower than a set water level threshold, a water replenishing valve is opened for replenishing water, and when a backwater temperature is lower than a set backwater temperature threshold, a backwater valve is opened for returning water;
when the water tank is in a peak period advanced heat storage mode, the air source heat pumps, the corresponding fixed-frequency circulating pumps and the valve elements in all the parallel branches are started, a first temperature feedback threshold value is preset in the water tank, the air source heat pumps, the corresponding fixed-frequency circulating pumps and the valve elements in all the parallel branches are closed when the temperature value exceeds the first temperature feedback threshold value, a water supplementing valve is started to supplement water when the water level in the water tank is lower than a set water level threshold value, and a water returning valve is started to return water when the water returning temperature is lower than a set water returning temperature threshold value.
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