CN210602325U - Low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit - Google Patents
Low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit Download PDFInfo
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- CN210602325U CN210602325U CN201921797541.6U CN201921797541U CN210602325U CN 210602325 U CN210602325 U CN 210602325U CN 201921797541 U CN201921797541 U CN 201921797541U CN 210602325 U CN210602325 U CN 210602325U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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Abstract
A low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit comprises a heat pump unit body, a water-water heat exchanger, a low-temperature water pipeline and a medium-temperature water pipeline; the heat pump unit body comprises an evaporator, an absorber, a generator and a condenser; the low-temperature water pipeline is connected with the high-temperature side of the water-water heat exchanger, and the medium-temperature water pipeline is sequentially connected with the low-temperature side of the water-water heat exchanger, the absorber and the condenser and is output to a heat user from the condenser. The utility model reduces the investment of the heat pump unit and the energy consumption of the system on the one hand; on the other hand, the heating range of the medium-temperature water is effectively reduced, the temperature of the medium-temperature water inlet is increased, the flash evaporation loss of the evaporator is reduced, and the heating efficiency of the unit is improved.
Description
Technical Field
The utility model relates to a lithium bromide absorption heat pump unit, especially a low temperature heat source cascade utilization type lithium bromide absorption heat pump unit.
Background
As shown in figure 1, the lithium bromide absorption heat pump unit comprises an evaporator, an absorber, a generator and a condenser, wherein a driving heat source is input into the generator, and the heat pump unit is driven by the driving heat source, the traditional lithium bromide absorption heat pump unit generally directly enters low-temperature water into the evaporator of the heat pump unit without preheating, and the mode has the defects that the heating range of ① medium-temperature water is large, for example, in figure 1, 45 ℃ medium-temperature water directly passes through the absorber and the condenser and then is output by 90 ℃, so that the energy consumption of the heat pump unit is large, the cost is greatly increased, ② if the temperature of the low-temperature heat source is far higher than the temperature of an inlet of the medium-temperature water, for example, 60 ℃ low-temperature water is input in figure 1, the temperature difference is 15 ℃, so that the concentration of an absorber solution is over-diluted, thereby increasing the flash loss of the evaporator, and ③ when the temperature difference of the traditional heating temperature is large, the pressure in the absorber and the condenser is very uneven, the pressure at the inlet is low, the pressure at the outlet is high, and the COP is.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the above-mentioned not enough and providing a low temperature heat source cascade utilization type lithium bromide absorption heat pump unit that the energy consumption is low, with low costs of prior art.
The technical scheme of the utility model is that: a low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit comprises a heat pump unit body, a water-water heat exchanger, a low-temperature water pipeline and a medium-temperature water pipeline; the heat pump unit body comprises an evaporator, an absorber, a generator and a condenser; the low-temperature water pipeline is connected with the high-temperature side of the water-water heat exchanger, and the medium-temperature water pipeline is sequentially connected with the low-temperature side of the water-water heat exchanger, the absorber and the condenser and is output to a heat user from the condenser.
Furthermore, the water-water heat exchanger and the evaporator are connected in series, and the low-temperature water pipeline is sequentially connected with the high-temperature side of the water-water heat exchanger and the evaporator and outputs the water-water heat exchanger and the evaporator to return to a centralized heat source.
Alternatively, the water-water heat exchanger and the evaporator are connected in parallel, the low-temperature water pipeline is divided into at least two paths, one path passes through the high-temperature side of the water-water heat exchanger, the other path passes through the evaporator, and then the two paths are converged into one path to return to the concentrated heat source.
Further, the low temperature water inlet temperature of the water-water heat exchanger is higher than the medium temperature water inlet temperature.
Further, a high-temperature side and a low-temperature side of the water-water heat exchanger adopt a counter-flow heat exchange structure.
Further, a low-temperature side water outlet of the water-water heat exchanger is respectively connected with a water inlet and a water outlet of the evaporator through a three-way valve.
Further, the low-temperature water pipeline is respectively connected with the water inlet of the evaporator and the low-temperature side water inlet of the water-water heat exchanger through a three-way valve.
The utility model has the advantages that:
(1) the mode of preheating the medium-temperature water by the low-temperature water is adopted, so that the functions of part of the heat pump units are replaced, and the part does not need to consume a driving heat source, so that the investment of the heat pump units and the energy consumption of a system are reduced;
(2) the mode of preheating low-temperature water first can effectively reduce the temperature rise range of medium-temperature water, improve the temperature of a medium-temperature water inlet, reduce the flash evaporation loss of an evaporator and improve the heating capacity of a unit.
Drawings
Fig. 1 is a schematic structural view of a conventional lithium bromide absorption heat pump unit;
fig. 2 is a schematic structural diagram of a parallel mode according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a series mode according to an embodiment of the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and specific examples.
As shown in fig. 2 and 3: a low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit comprises a heat pump unit body, a water-water heat exchanger, a low-temperature water pipeline and a medium-temperature water pipeline; the heat pump unit body comprises an evaporator, an absorber, a generator and a condenser; a driving heat source is input into the generator; the low-temperature water pipeline is connected with the high-temperature side of the water-water heat exchanger, and the medium-temperature water pipeline is sequentially connected with the low-temperature side of the water-water heat exchanger, the absorber and the condenser and is output to a heat user from the condenser.
In the embodiment, low-temperature water enters the high-temperature side of the water-water heat exchanger through the low-temperature water pipeline to serve as a heating source, medium-temperature water at the low-temperature side of the water-water heat exchanger is heated, and then the medium-temperature water enters the absorber and the condenser to be heated step by step, so that the problem of uneven pressure in the absorber and the condenser caused by overlarge temperature difference of the medium-temperature water is solved; on the other hand, the problem that the concentration of the absorber solution is over-diluted when the temperature of the low-temperature water is far higher than the temperature of the medium-temperature water inlet is solved, and therefore the flash loss of the evaporator is reduced. In addition, according to the principle of low-temperature heat source cascade, because the low-temperature water inlet temperature of the water-water heat exchanger is higher than the medium-temperature water inlet temperature, the medium-temperature water in the embodiment is heated by the water-water heat exchanger and then enters the heat pump unit body for heating, so that the COP of the heat pump unit is improved, and the investment of the whole system is reduced.
The high-temperature side and the low-temperature side of the water-water heat exchanger adopt a counter-flow heat exchange structure, for example, low-temperature water enters from an upper water inlet at one end of the water-water heat exchanger and flows out from a lower water outlet, medium-temperature water enters from a lower water inlet at the other end of the water-water heat exchanger and flows out from an upper water outlet, so that the counter-flow structure is formed, and the heat exchange efficiency is greatly improved.
The connection between the water-water heat exchanger and the evaporator of the present embodiment can be made in a series mode or a parallel mode.
When a parallel mode is adopted, the low-temperature water pipeline is divided into at least two paths, one path passes through the high-temperature side of the water-water heat exchanger, the other path passes through the evaporator, and then the two paths are converged into one path to return to the centralized heat source.
When the series mode is adopted, the low-temperature water pipeline is connected with the high-temperature side of the water-water heat exchanger and the evaporator in sequence, and the low-temperature water pipeline is output from the evaporator and returns to the centralized heat source.
The following is a preferred embodiment of the present invention using the parallel mode:
as shown in fig. 2: the low-temperature water at the temperature of 60 ℃ is divided into two paths, one path of water passes through the high-temperature side of the water-water heat exchanger to be used as a heating heat source, the medium-temperature water at the temperature of 45 ℃ at the low-temperature side of the water-water heat exchanger is heated, and the low-temperature water is further cooled to the temperature of 45 ℃ and then is output; the other path enters an evaporator, is cooled to 45 ℃ in the evaporator and then is output, and then the two paths are converged into one path to return to the concentrated heat source.
The medium temperature water with the temperature of 45 ℃ enters the low temperature side of the water-water heat exchanger, exchanges heat with the high temperature side of the water-water heat exchanger to be heated to obtain medium temperature water with the temperature of 58 ℃, then enters the absorber and the condenser to be heated step by step, and the medium temperature water with the temperature of 90 ℃ is output from the condenser to a heat user.
In the embodiment, the water-water heat exchanger is fully utilized to heat the 45 ℃ medium temperature water to 58 ℃ and then the water enters the heat pump unit body, namely the 58 ℃ medium temperature water entering the water inlet of the heat pump unit body is heated to 90 ℃ step by step through the absorber and the condenser, and compared with the traditional method that the 45 ℃ medium temperature water directly enters the heat pump unit body to be heated to 90 ℃, on one hand, the heating amplitude of the medium temperature water can be effectively reduced, the inlet temperature of the medium temperature water is increased, the flash evaporation loss of the refrigerant in the evaporator is reduced, and the heating capacity of the heat pump unit is improved; on the other hand, the difference between the inlet temperature of low-temperature water (namely the inlet temperature of the evaporator is 60 ℃) and the inlet temperature of medium-temperature water (namely the inlet temperature of the absorber is 58 ℃) is small, so that the concentration of the solution in the absorber is moderate, and the flash loss of the evaporator is reduced.
The following is a preferred embodiment of the present invention using the series mode:
as shown in fig. 3: the low-temperature water with the temperature of 60 ℃ enters the high-temperature side of the water-water heat exchanger to be used as a heating heat source, the medium-temperature water with the temperature of 45 ℃ at the low-temperature side of the water-water heat exchanger is heated, the low-temperature water is further cooled to 52 ℃ and then is output, the low-temperature water enters the evaporator, and the low-temperature water with the temperature of 45 ℃ is output after being cooled in the evaporator and returns to the concentrated heat source.
The medium temperature water with the temperature of 45 ℃ enters the low temperature side of the water-water heat exchanger, exchanges heat with the high temperature side of the water-water heat exchanger to be heated to obtain medium temperature water with the temperature of 58 ℃, then enters the absorber and the condenser to be heated step by step, and the medium temperature water with the temperature of 90 ℃ is output from the condenser to a heat user.
Compared with the parallel mode, the series mode of the embodiment plays more roles of the water-water heat exchanger, so that the cheap water-water heat exchanger replaces part of work of the heat pump unit main machine, and the investment is reduced.
In this embodiment, the series and parallel modes can also be switched by setting a valve. Preferably, a low-temperature side water outlet of the water-water heat exchanger is respectively connected with a water inlet and a water outlet of the evaporator through a three-way valve; the low-temperature water pipeline is respectively connected with the water inlet of the evaporator and the low-temperature side water inlet of the water-water heat exchanger through a three-way valve.
When the parallel mode is adopted, the low-temperature water pipeline is respectively communicated with the water inlet of the evaporator and the low-temperature side water inlet of the water-water heat exchanger by controlling the three-way valve, and the low-temperature side water outlet of the water-water heat exchanger is communicated with the water outlet of the evaporator and is disconnected with the water inlet of the evaporator.
When the series mode is adopted, the low-temperature water pipeline is communicated with the low-temperature side water inlet of the water-water heat exchanger and disconnected with the water inlet of the evaporator by controlling the three-way valve; and a low-temperature side water outlet of the water-water heat exchanger is communicated with a water inlet of the evaporator and is disconnected with a water outlet of the evaporator.
In addition, when the temperature of the low-temperature water inlet of the water-water heat exchanger is lower than that of the medium-temperature water inlet, the series mode can generate a reaction, and the three-way valve needs to be controlled to be switched to the parallel mode.
Claims (7)
1. A low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit comprises a heat pump unit body, a water-water heat exchanger, a low-temperature water pipeline and a medium-temperature water pipeline; the heat pump unit body comprises an evaporator, an absorber, a generator and a condenser; the low-temperature water pipeline is connected with the high-temperature side of the water-water heat exchanger, and the medium-temperature water pipeline is sequentially connected with the low-temperature side of the water-water heat exchanger, the absorber and the condenser and is output to a heat user from the condenser.
2. The low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit according to claim 1, wherein the water-water heat exchanger and the evaporator are connected in series, and the low-temperature water pipeline is connected with the high-temperature side of the water-water heat exchanger and the evaporator in sequence and is output from the evaporator and returned to the concentrated heat source.
3. The low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit according to claim 1, wherein the water-water heat exchanger and the evaporator are connected in parallel, the low-temperature water pipeline is divided into at least two paths, one path passes through the high-temperature side of the water-water heat exchanger, the other path passes through the evaporator, and then the two paths are merged into one path and return to the concentrated heat source.
4. A low temperature heat source cascade utilization type lithium bromide absorption heat pump unit according to claim 1, 2 or 3, wherein the low temperature water inlet temperature of the water-water heat exchanger is higher than the medium temperature water inlet temperature.
5. A low temperature heat source cascade utilization type lithium bromide absorption heat pump unit as claimed in claim 1, 2 or 3, wherein the high temperature side and the low temperature side of the water-water heat exchanger adopt a counter flow heat exchange structure.
6. A low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit according to claim 1, 2 or 3, wherein a low-temperature side water outlet of the water-water heat exchanger is respectively connected with a water inlet and a water outlet of the evaporator through a three-way valve.
7. A low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit according to claim 1, 2 or 3, wherein the low-temperature water pipeline is respectively connected with a water inlet of the evaporator and a low-temperature side water inlet of the water-water heat exchanger through a three-way valve.
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| CN201921797541.6U CN210602325U (en) | 2019-10-24 | 2019-10-24 | Low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit |
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| CN201921797541.6U CN210602325U (en) | 2019-10-24 | 2019-10-24 | Low-temperature heat source cascade utilization type lithium bromide absorption heat pump unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177208A (en) * | 2020-09-14 | 2021-01-05 | 衡阳市雁证不锈钢商贸有限公司 | Heat preservation type glass curtain wall |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177208A (en) * | 2020-09-14 | 2021-01-05 | 衡阳市雁证不锈钢商贸有限公司 | Heat preservation type glass curtain wall |
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