CN210373723U - Water storage unit combined hot water system - Google Patents
Water storage unit combined hot water system Download PDFInfo
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- CN210373723U CN210373723U CN201920858838.2U CN201920858838U CN210373723U CN 210373723 U CN210373723 U CN 210373723U CN 201920858838 U CN201920858838 U CN 201920858838U CN 210373723 U CN210373723 U CN 210373723U
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Abstract
The utility model relates to a water storage unit combination formula hot water system belongs to water heater technical field. The system comprises a heat storage heat source, a heat supplementing heat source and a heat storage water tank unit, wherein the heat storage water tank unit is of an isolated heating type, a hot water outlet of the heat supplementing heat source is connected with a water pipeline, a cold water inlet of the heat supplementing heat source is communicated with a hot water outlet of a first-stage heat storage water tank unit, a cold water inlet of a preceding-stage heat storage water tank unit is communicated with a hot water outlet of a subsequent-stage heat storage water tank unit, and a cold water inlet of a last stage is connected with a water source; the heat storage heat source heats the heat supplementing heat source and the heat storage water tank unit in a medium circulating heating mode, and the heat storage heat source is connected with the heat supplementing heat source and the short-circuit circulating heating pipelines of the heat storage water tanks at all levels through automatic control valves. The utility model can ensure that the commercial hot water system can rapidly provide sufficient hot water, realize the graded heating according to the needs and reduce the energy waste as much as possible; and the problems of energy consumption for preventing freezing in winter, scaling and corrosion of a heat exchanger, pressure impact of pump circulation on a water storage system and the like are solved.
Description
Technical Field
The utility model relates to a hot water supply system, especially a water storage unit combination formula hot water system belongs to water heater technical field.
Background
In a plurality of commercial fields such as hotels, restaurants, bathing centers and the like, a heating source and a large-volume open non-pressure-bearing heat storage water tank are required to be arranged so as to meet the requirement of centralized water use. However, the open non-pressure-bearing water tank is communicated with the atmosphere, so that the problems of easy bacterial breeding, large heat dissipation of the water tank, high operation energy consumption, unstable water temperature, low hot water utilization rate and the like exist. In order to ensure stable water supply temperature and economic operation cost, the whole large-tonnage water storage tank is broken into parts, and a plurality of closed pressure-bearing small water tanks are used for heating instead of the whole large-tonnage water storage tank, so that the improved research and development direction is formed. It can be known from the search that the chinese patent documents with application numbers 201020266310.5, 201510580171.0, 201520703674.8 and 201610426679.X successively disclose that the technical solutions of heating the cascade water tanks, i.e. the small-volume water tanks connected in series and in parallel with each other, all belong to the improvements.
However, practice and research have shown that the above prior art generally has the following disadvantages:
1) the cascade water tanks are mutually connected in series, and must be sequentially heated step by step, and can not directly heat the middle-level water tank, namely, the cascade water tanks can not be independently heated, can only form large-cycle heating, and need a large-power circulating pump;
2) the direct water circulation heating mode is adopted, although the heat exchange efficiency is high, the domestic hot water and the circulation heating medium are mixed, the disturbance on the hot water stored in the water tank is large, the stability of the water temperature is influenced, and the integral hot water utilization rate is reduced;
3) during the heating process, water is discharged, and the flow direction of inlet water is opposite to the flow direction of circulation, so that the instability of system water flow is easily caused;
4) the direct circulation heating is easy to generate a scale layer on the heat source side heat exchanger, the heat efficiency is reduced, even the blockage or the serious corrosion is caused to influence the service life, and the pressure impact is generated on the whole water storage system when the pump circulation is frequently started, so that the service life of the water storage system is reduced;
5) the pipeline is directly circularly heated, heating and freeze prevention are needed in winter, and energy consumption is large.
The water tanks are mutually connected in series and must be sequentially heated from back to front step by step, namely, only large-cycle heating can be formed, heating can not be performed according to needs, mutual disturbance among the water tanks generated by direct cycle heating and mixed heat dissipation of high-temperature water and low-temperature water cause energy conservation difficulty, and the system is unstable in operation.
Disclosure of Invention
The utility model aims at providing a water storage unit combined hot water system aiming at the outstanding problems in the prior art, which not only can provide sufficient hot water basically and rapidly without disturbance, but also can realize graded heating as required, and heat can be supplemented just as well and properly, and the energy waste is reduced as much as possible on the premise of ensuring the water demand.
In order to achieve the above object, the basic technical scheme of the water storage unit combined hot water system of the utility model is as follows:
the system comprises at least one heat storage heat source with a circulation outlet and a circulation inlet, at least one heat supplementing heat source with a cold water inlet and a hot water outlet and at least one stage of heat storage water tank unit, wherein the heat supplementing heat source and each stage of heat storage water tank unit are respectively provided with an independent heat exchanger capable of being controlled in an on-off mode and provided with a short-circuit inlet and a short-circuit outlet;
a hot water outlet of the heat supplementing heat source is connected with a water pipeline, a cold water inlet of the heat supplementing heat source is communicated with a hot water outlet of the first-stage heat storage water tank unit, a cold water inlet of the front-stage heat storage water tank unit is communicated with a hot water outlet of the rear-stage heat storage water tank unit, and a cold water inlet of the last-stage heat storage water tank unit is connected with a water source;
and the circulation outlet of the heat storage heat source is respectively connected with the heat supplementing heat source and the short-circuit inlets of the independent heat exchangers of the heat storage water tanks at all levels, and the heat supplementing heat source and the short-circuit outlets of the independent heat exchangers of the heat storage water tanks at all levels are converged and then connected with the circulation inlet of the heat storage heat source through a circulation pump.
Furthermore, the tail end of the water using pipeline is connected with the last stage of heat storage water tank unit through a return pipe, a return ring pump and a one-way valve. Therefore, the heat preservation circulation of the water using pipeline can be formed, and the hot water can be discharged in time when water is used everywhere no matter how long the pipeline is.
When in operation, the utility model discloses a water storage unit combined type hot water system not only can realize with establishing ties as prior art: cold water enters from the last stage of heat storage water tank and pushes hot water out step by step from the back to the front until the hot water is supplied to a water pipeline by a heat supplementing heat source, so that sufficient hot water supply is ensured, and the water temperature is stable through step by step buffering; and because the cascade series connection of the heat storage water tank and the cascade parallel connection of the independent heat exchanger are organically combined, domestic hot water and a circulating heating medium are mutually isolated, an on-off control valve and a circulating pump of a certain stage of heat storage water tank unit can be controlled and opened as appropriate according to the actual demand of water, so that the independent heat exchanger and a heat storage heat source form local heat exchange medium circulation, and as a result, the staged heating can be controlled as required, and the heat can be accurately supplemented as much as possible.
Further, the top of the heat supplementing heat source and the top of each stage of the heat storage water tank unit are respectively provided with a cold water inlet and a hot water outlet; the cold water inlet and the hot water outlet extend downward to the bottom and the upper portion, respectively. Therefore, water with relatively low temperature and relatively high temperature respectively enters the bottom and the upper part of the heat supplementing heat source or each stage of the heat storage water tank unit, and the water temperature stratification mechanism is more favorable for keeping the water temperature at each part stable.
Furthermore, the independent heat exchangers are respectively positioned at the lower parts of the heat supplementing heat source and each stage of heat storage water tank unit, and the short-circuit inlet and the short-circuit outlet are respectively positioned at the upper end and the lower end of the independent heat exchanger. Therefore, the flow direction of the heat exchange medium flows from higher water temperature to lower water temperature, forward heat exchange is formed, and reverse absorption of heat of the water tank is avoided when the heat exchange medium flows reversely.
Further, the heat storage water tank unit is a heat storage water tank unit formed by connecting at least two heat storage water tanks in series.
Adopt the utility model discloses afterwards, can conveniently pass through pipeline on-off control as appropriate, realize the simple state of draining, keep apart various operating condition such as location circulation heating, concurrent heating, return water heat preservation circulation, have following a great deal of beneficial effect:
1) pure water discharge state: the hot water is sufficiently reserved and is buffered step by step, and the water temperature is very stable;
2) isolated positioning and circulating heating: the positioning isolation heating circulation is realized, the water temperature disturbance of an irrelevant water tank caused by the large circulation heating is avoided, and the water temperature disturbance caused by the circulation heating can be avoided due to the complete isolation of the domestic hot water and the circulation heating medium, so that the utilization rate of the hot water is greatly improved;
3) water drainage and heat supplement: the appropriate middle water tank heat compensation can be selected according to the water demand without disturbing the water temperature stratification of the original water tank, the disturbance heat loss of direct circulation heating to the hot water in the water tank is avoided, the heat compensation is more stable in the water discharging process, and the hot water temperature of a user side is more constant;
4) and (3) return water heat preservation circulation: the water circulation that the water supply pipeline is always filled with hot water can be formed, and the instant heating and opening are ensured;
5) the heat-supplementing heat source and the heat-storing water tank unit are heated by the heat-storing heat source in a closed medium circulating heating mode, so that scaling and corrosion of a heat exchanger in the heat-storing heat source can be effectively avoided, the resistance of the heat exchanger is obviously reduced, the power consumption of a circulating pump can be obviously reduced, meanwhile, the circulating medium runs in an independent heat exchanger, pressure impact of pump circulation on the whole heat-storing heat source and the heat-storing water tank unit is avoided, and the service life of the water storage system is prolonged;
6) the freezing point of the medium of the closed heating cycle is low, and the anti-freezing function of the circulating heating pipeline can be cancelled in winter, so that the energy consumption of the system operation is further reduced.
In a word, the utility model not only can ensure the undisturbed rapid supply of sufficient hot water of the commercial hot water system, but also realizes the graded heating according to the requirement, and reduces the energy waste as much as possible; the problems of energy consumption for preventing freezing in winter, scaling and corrosion of a heat exchanger, pressure impact of pump circulation on a water storage system and the like are solved, and multiple purposes are achieved.
Drawings
Fig. 1 is a schematic diagram of a system according to a first embodiment of the present invention.
Fig. 2 is a schematic view of the embodiment of fig. 1 in a state of discharging water only.
FIG. 3 is a schematic illustration of the localized cyclic heating of the embodiment of FIG. 1.
Fig. 4 is a schematic diagram of the embodiment of fig. 1 with simultaneous water discharge and heat replenishment.
FIG. 5 is a schematic diagram of a return water holding cycle of the embodiment of FIG. 1.
FIG. 6 is a schematic view of the step-by-step cyclic heating of the embodiment of FIG. 1.
In the figure: the thin solid line is a temporary stationary pipeline, the thin dotted line is a cold water or cold medium pipeline, and the thick dot line is a hot water or hot medium pipeline.
Detailed Description
Example one
As shown in fig. 1, the water storage unit combined hot water system of the present embodiment includes a heat pump hot water device T as a heat storage source, a positive displacement hot water device T0 as a heat compensation source, and several stages of hot water storage tank units T1 — Tn (n is a natural number). The heat pump water heating device T is provided with a circulation outlet to and a circulation inlet ti, the tops of the volume type water heating device T0 and the plurality of stages of heat storage water tank units T1-Tn are respectively provided with a cold water inlet and a hot water outlet, and the cold water inlet and the hot water outlet respectively extend downwards to the bottom and the upper part of the volume type water heating device T0 or the heat storage water tank units T1-Tn; the lower parts of the volume type hot water device T0 and the plurality of stages of hot water storage tank units T1-Tn are respectively provided with a vertical coil independent heat exchanger with a short-circuit inlet and a short-circuit outlet, and the short-circuit inlet and the short-circuit outlet are respectively positioned at the upper end and the lower end of the independent heat exchanger.
The hot water outlet of the volume type hot water device T0 is connected with a water using pipeline, and the tail end of the water using pipeline is connected with the last stage of the hot water storage tank unit Tn through a return ring pump B and a one-way valve to form a return water heat preservation circulation loop.
The cold water inlet of the positive displacement hot water device T0 is communicated with the hot water outlet of the first-stage hot water storage tank unit T1, the cold water inlet of the front-stage hot water storage tank unit is communicated with the hot water outlet of the rear-stage hot water storage tank unit, and the cold water inlet of the last-stage hot water storage tank unit Tn is connected with a tap water source.
The circulation outlet to of the heat pump water heating device T is connected with the volume type water heating device T0 and the short-circuit inlets of the independent heat exchangers of the plurality of stages of heat storage water tank units T1-Tn through the on-off control valve F, and the volume type water heating device T0 and the short-circuit outlets of the independent heat exchangers of the heat storage water tanks T1-Tn are converged and then connected with the circulation inlet ti of the heat pump water heating device T through the circulation pump P.
When the water storage unit combined hot water system of the embodiment operates, the following various working conditions can be provided:
1) in a pure water discharging state, as shown in fig. 2, after cold water from a tap water source enters from the last stage of the hot water storage tank unit Tn, hot water stored in the last stage of the hot water storage tank unit Tn is ejected from the back to the front stage of the hot water storage tank unit Tn, and the hot water is supplied to a water pipeline by the volumetric hot water device T0. During which the other lines are closed. Thus, the hot water is sufficiently supplied and the temperature of the water is gradually buffered, so that the temperature of the supplied hot water is very stable.
2) Positioning and circulating heating-as shown in fig. 3, when it is determined that a certain hot water storage tank unit, for example, Tn-2 needs to be heated according to water use condition prediction and water temperature detection of each stage of hot water storage tank unit, an on-off control valve F and a circulating pump P of the water tank Tn-2 are independently opened, a hot circulating medium output by a heat pump water heating device T enters an independent heat exchanger of the water tank through a short-circuit inlet of the heat exchanger of the hot water storage tank unit Tn-2, and relatively cold heat exchange medium in the hot water storage tank unit T circulates out to the heat pump water heating device T through a short-circuit outlet to form circulating heating of the hot water storage tank unit Tn-2 until the water temperature of the hot. During which other lines are temporarily closed. Therefore, the heating can be carried out in stages according to the needs, the heat can be supplemented properly and rightly, and the energy waste is reduced.
3) When a certain hot water storage tank unit, such as Tn-2, needs to be heated according to water use condition prediction and water temperature detection of hot water storage tanks at all levels, an on-off control valve F and a circulating pump P of the hot water storage tank unit Tn-2 are independently opened, and a circulating medium output by a heat pump hot water device T enters an independent heat exchanger from a short-circuit inlet of the hot water storage tank unit Tn-2 to form circulating heating of the water tank, as shown in FIG. 4; meanwhile, after cold water enters from the last stage of heat storage water tank unit Tn, hot water is ejected from the back to the front step by step until hot water is supplied to a water using pipeline by the positive displacement hot water device T0. Therefore, the appropriate intermediate hot water storage tank unit can be selected according to the requirement for accurate heat supplement, the energy waste is reduced as much as possible, and the required hot water is provided more timely and stably.
4) And (2) return water heat preservation circulation, as shown in fig. 5, when no water is needed temporarily, a return pump B is started, cold water at the tail end of a water using pipeline enters from the last stage of heat storage water tank unit Tn, hot water is ejected from the last stage of heat storage water tank unit Tn and is discharged from the back to the front stage of heat storage water tank unit Tn step by step until the positive displacement water heating device T0 supplies hot water to the water using pipeline, so that water circulation that the water supplying pipeline is filled with hot water all the time is formed, and then the water can be heated at once.
5) Stepwise cyclic heating-if necessary, the system of this embodiment may also realize sequential stepwise cyclic heating from the supplementary heat source T0 to the last stage hot water storage tank unit Tn, which is the same as that in the prior art, as shown in fig. 6 (since hot water is supplied to the user from the supplementary heat source first, heating is performed from the supplementary heat source T0 to the last stage Tn in the conventional stepwise heating).
Tests show that compared with the prior art, the control logic is simplified because only the positive displacement water heating device needs to be controlled in the water discharging process; particularly, the intermediate heat storage water tank unit of the cascade water tank can be heated in a flexible small cycle manner as required, so that accurate positioning and isolation heating are realized; and domestic hot water and circulating heating medium are completely isolated, so that any water temperature disturbance caused by circulating heating can be avoided, and the hot water yield is greatly improved. The heat storage heat source heats the heat supplementing heat source and the heat storage water tank unit in a closed medium circulating heating mode, so that scaling of the heat exchanger in the heat storage heat source can be effectively avoided, the resistance of the heat exchanger is obviously reduced, and the power consumption of the circulating pump can be obviously reduced. And the freezing point of the medium in the closed heating cycle is low, so that the anti-freezing function of the circulating heating pipeline can be cancelled in winter, and the energy consumption of the system operation is reduced. Because the circulating medium runs in the independent heat exchanger, pressure impact of pump circulation on the whole heat storage heat source and the heat storage water tank unit is avoided, and the service life of the water storage system is prolonged.
In addition to the above embodiments, other embodiments of the present invention are also possible. For example, the on-off control of the independent heat exchanger not only connects the circulation outlet of the heat storage heat source with the short-circuit inlets of the heat supplementing heat source and the independent heat exchangers of the heat storage water tanks at all levels through the on-off control valve, but also can set the on-off control valve behind the short-circuit outlets of the heat supplementing heat source and the independent heat exchangers of the heat storage water tanks at all levels, and then the on-off control valve is connected with the circulation inlet of the heat storage heat source through the circulation pump after being; for another example, the heat storage heat source can be a solar water heater, a gas water heater, an electric water heater, etc. besides a heat pump water heater; for another example, the heat-supplementing heat source can be a heat pump, a gas-fired or electric heating water heater, besides a volumetric water heater; in addition, the heat storage water tank unit can be a heat storage water tank, and can also be formed by connecting at least two heat storage water tanks in series. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the present application.
Claims (9)
1. A water storage unit combined hot water system comprises at least one heat storage heat source with a circulation outlet and a circulation inlet, at least one heat supplementing heat source with a cold water inlet and a hot water outlet respectively and at least one stage of hot water storage tank unit, and is characterized in that the heat supplementing heat source and each stage of hot water storage tank unit are respectively provided with an independent heat exchanger capable of being controlled in an on-off mode and provided with a short-circuit inlet and a short-circuit outlet;
a hot water outlet of the heat supplementing heat source is connected with a water pipeline, a cold water inlet of the heat supplementing heat source is communicated with a hot water outlet of the first-stage heat storage water tank unit, a cold water inlet of the front-stage heat storage water tank unit is communicated with a hot water outlet of the rear-stage heat storage water tank unit, and a cold water inlet of the last-stage heat storage water tank unit is connected with a water source;
and the circulation outlet of the heat storage heat source is respectively connected with the heat supplementing heat source and the short-circuit inlets of the independent heat exchangers of the heat storage water tanks at all levels, and the heat supplementing heat source and the short-circuit outlets of the independent heat exchangers of the heat storage water tanks at all levels are converged and then connected with the circulation inlet of the heat storage heat source through a circulation pump.
2. The water storage unit modular hot water system of claim 1, wherein: and the tail end of the water using pipeline is connected with the last stage of heat storage water tank unit through a return pipe, a return ring pump and a one-way valve.
3. The water storage unit modular hot water system of claim 2, wherein: the tops of the heat supplementing heat source and each stage of heat storage water tank unit are respectively provided with a cold water inlet and a hot water outlet; the cold water inlet and the hot water outlet extend downward to the bottom and the upper portion, respectively.
4. A water storage unit modular hot water system as claimed in claim 3, wherein: the independent heat exchangers are respectively positioned at the lower parts of the heat supplementing heat source and each stage of heat storage water tank unit, and the short-circuit inlet and the short-circuit outlet are respectively positioned at the upper end and the lower end of the independent heat exchanger.
5. The water storage unit modular hot water system of claim 4, wherein: the heat storage water tank unit is a heat storage water tank unit formed by connecting at least two heat storage water tanks in series.
6. The water storage unit modular hot water system of claim 5, wherein: the heat storage heat source is one of a heat pump water heating device, a solar water heating device, a gas water heating device and an electric water heating device.
7. The water storage unit modular hot water system of claim 6, wherein: the heat supplementing heat source is one of a volume type water heating device, a heat pump water heating device, a gas water heating device and an electric water heating device.
8. A water storage unit modular hot water system as claimed in any one of claims 1 to 7, wherein: and a circulating outlet of the heat storage heat source is connected with the heat supplementing heat source and a short-circuit inlet of the independent heat exchanger of each stage of heat storage water tank respectively through an on-off control valve.
9. A water storage unit modular hot water system as claimed in any one of claims 1 to 7, wherein: and on-off control valves are respectively arranged at short-circuit outlets of the independent heat exchangers of the heat supplementing heat source and the heat storage water tanks at all levels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920858838.2U CN210373723U (en) | 2019-06-10 | 2019-06-10 | Water storage unit combined hot water system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920858838.2U CN210373723U (en) | 2019-06-10 | 2019-06-10 | Water storage unit combined hot water system |
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| CN210373723U true CN210373723U (en) | 2020-04-21 |
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| CN201920858838.2U Active CN210373723U (en) | 2019-06-10 | 2019-06-10 | Water storage unit combined hot water system |
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| CN (1) | CN210373723U (en) |
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