Air source heat pump double-water-tank hot water system and control method thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
An air source heat pump and hot water system technology, applied in heat pumps, refrigerators, refrigeration components, etc., can solve the problems of large start-up and stop loss, water mixing loss, unfavorable unit control, etc., to reduce condensation temperature, improve energy efficiency, reduce The effect of energy loss
Active Publication Date: 2021-04-16
TONGJI UNIV
View PDF14 Cites 3 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0005] In actual use, most of the existing heat pump hot water systems have the following three problems: first, the high temperature hot water (about 55°C) produced by the heat pump, the medium temperature return water (about 40°C) of the end pipe network, and the supplementary water The low-temperature cold water (about 15°C) in the pipeline is uniformly sent to the hot water tank, and there is a loss of mixed water; second, multiple heat pump hosts and heat collection pumps use the same controller, which can only be started and stopped as a whole, which is not conducive to the operation under partial load. The unit is controlled, and the loss of starting and stopping is large; thirdly, in order to resist the temperature drop of mixed water and avoid frequent starting and stopping, the heat pump host needs to supply higher water temperature (about 55 ℃) to deal with the terminal water supply (about 50 ℃), and the high water supply temperature increases The condensing temperature of the unit reduces the energy efficiency of the heat pump host
The dual water tank system used in the above patent only divides the water tank into the main water tank and the auxiliary water tank. The heat pump only heats one of the water tanks at a time, and uses the method of staggered peak storage to ensure the water temperature and save energy consumption. The double water tanks are not really used. The advantages of the system, and the above patents do not consider the situation that multiple heat pumps start and stop at the same time
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0055] The air source hot water double tank hot water system in this embodiment has a structure such as figure 1 As shown, the main structure includes a hot water tank 1-1, a warm water tank 1-2, a first air source heat pump 1-3, a first fixed frequency circulation pump 1-4, a first butterfly valve 1-5, and a second air source heat pump 1-6, the third air source heat pump 1-7, the second fixed frequency cycle heat pump 1-8, the second butterfly valve 1-9, frequency conversion water supply pump 1-10, connecting pipes 1-11~1-31, water level measuring points 1-32, backwater valve 1-22, replenishment valve 1-34, return water temperature measuring point 1-35, water tank temperature measuring point 1-36.
[0056] In the low-load heating mode, the first air source heat pump 1-3, the first fixed frequency circulation pump 1-4, the first butterfly valve 1-5, and the frequency conversion water supply pump 1-10 are all turned on, and the second air source heat pump 1- 6. The third air s...
Embodiment 2
[0061] The air source hot water double tank hot water system in this embodiment, if it cannot be started and stopped in groups, but can only be started and stopped as a whole, its structure is as follows figure 2 As shown, the main structure includes 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, and a fixed frequency circulation pump 2-6, butterfly valve 2-7, return water temperature measuring point 2-8, water tank temperature measuring point 2-9, frequency conversion water supply pump 2-10, connecting pipe 2-11~2-26, return water valve 2-27, Water supply valve 2-28, water temperature measuring point 2-29.
[0062] Since the units cannot be started and stopped in groups, the heating modes of different loads cannot be realized, leaving only the general heating mode and the heat storage mode in advance during the peak period.
[0063] In the general heating mode, the first air...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention relates to an air source heat pump double-water-tank hot water system and a control method. The air source heat pump double-water-tank hot water system comprises a variable-frequency water supply pump, a hot water tank, a warm water tank and a parallel host which are connected in sequence, and further comprises a water return valve and a water replenishing valve which are connected with the warm water tank; the hot water tank, the warm water tank and the parallel host are sequentially connected to form 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 water tank-tail end circulation; and the parallel host comprises a plurality of parallel branches which are independently controlled or not independently controlled, and different heat supply modes are achieved by opening a specific number of parallel branches, so that different tail end load requirements are met. Compared with the prior art, the double-water-tank scheme is adopted, so that the mixing loss among return water, replenished water and hot water is reduced; and meanwhile, 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, and the energy efficiency of the heat pump unit is improved while water consumption of a user is guaranteed.
Description
technical field [0001] The invention relates to a hot water system and a control method thereof, in particular to an air source heat pump double water tank hot water system and a control method thereof. Background technique [0002] At present, large and medium-sized buildings (such as office buildings, hospitals, dormitory buildings, teaching buildings, etc.) often use a centralized heating zone system to provide domestic hot water. The system takes a certain building or a building in a certain area as a unit, mainly medium and large hot water storage tanks, and provides heat sources in a centralized and unified manner to form a central hot water supply station. The central hot water supply station sends hot water to each district through hot water pipes in a network layout, and then sends hot water to each water distribution point through the transmission and distribution pipelines of each district. With people's emphasis on energy conservation and environmental protectio...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more