CN112556050A - Cold water (heat pump) unit with indirect natural cooling function for operating room - Google Patents
Cold water (heat pump) unit with indirect natural cooling function for operating room Download PDFInfo
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- CN112556050A CN112556050A CN202110213244.8A CN202110213244A CN112556050A CN 112556050 A CN112556050 A CN 112556050A CN 202110213244 A CN202110213244 A CN 202110213244A CN 112556050 A CN112556050 A CN 112556050A
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- heat exchanger
- water
- way valve
- natural cooling
- unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses a cold water (heat pump) unit with an indirect natural cooling function for an operating room, wherein a compressor, a four-way valve, a first heat exchanger, a throttling device and a second heat exchanger of the cold water (heat pump) unit with the indirect natural cooling function are sequentially connected through a pipeline to form a refrigerating or heating circulation loop, a fan is arranged at the first heat exchanger, and a water outlet pipe and a water return pipe are connected to the second heat exchanger; the water pump is connected with the intermediate heat exchanger through a pipeline to form an indirect natural refrigeration loop; one branch of the water outlet pipe flows through the intermediate heat exchanger and then is converged into the water outlet pipe. When the external temperature is low, the cold water (heat pump) unit with the indirect natural cooling function can reasonably utilize the cold source of the external environment, indirectly cool the circulating cooling water in the natural refrigeration loop in the low-temperature environment, indirectly reduce the temperature of the water at the use side through secondary heat exchange of the intermediate heat exchanger, and realize the operation refrigeration without a compressor, energy conservation and emission reduction.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a cold water (heat pump) unit with an indirect natural cooling function for an operating room.
Background
The clean fields such as operating rooms, laboratories, clean plants, data centers and the like need constant temperature and humidity conditions, refrigeration is needed all the year round, and cold water is still needed for indoor cooling or dehumidification even if the ambient temperature is very low in winter, namely the outdoor temperature is lower than or far lower than the temperature of circulating chilled water.
Most low-temperature refrigerating units in the prior stage are realized by adopting a special compressor and matching corresponding parts and special refrigerants, and the units operate throughout the year and have higher energy consumption.
The natural world has abundant cold sources, and particularly, the proportion of days below 0 ℃ in the northeast, northwest, north China and other areas is very high. Even in such a low-temperature environment, the compressor still operates to perform refrigeration, which greatly causes energy waste.
Disclosure of Invention
In order to overcome the defects, the invention provides the cold water (heat pump) unit with the indirect natural cooling function for the operating room, and the cold water (heat pump) unit with the indirect natural cooling function for the operating room can reasonably utilize a cold source of the external environment, cool circulating cooling water in a natural cooling loop in a low-temperature environment, indirectly reduce the temperature of water at a use side through secondary heat exchange of an intermediate heat exchanger, realize the operation refrigeration without a compressor, save energy and reduce emission.
In order to solve the above technical problems, the present invention provides a cold water (heat pump) unit with indirect natural cooling function for operating rooms, comprising: the system comprises a compressor, a four-way valve, a first heat exchanger, a throttling device and a second heat exchanger, wherein the compressor, the four-way valve, the first heat exchanger, the throttling device and the second heat exchanger are sequentially connected through pipelines to form a refrigerating or heating circulation loop; a fan is arranged at one position of the heat exchanger; a water outlet pipe and a water return pipe are connected to the second heat exchanger; the cold water (heat pump) unit with the indirect natural cooling function for the operating room further comprises a water pump and an intermediate heat exchanger, wherein the water pump and the intermediate heat exchanger are connected through a pipeline to form an indirect natural cooling loop; and one branch of the water outlet pipe flows through the intermediate heat exchanger and then is converged into the water outlet pipe.
Furthermore, the cold water (heat pump) unit with the indirect natural cooling function for the operating room further comprises an air cooler, the air cooler is connected in series with the indirect natural cooling loop, and the air cooler is located on the outer surface of the first heat exchanger.
Further, be provided with the three-way valve on the outlet pipe, the three-way valve is provided with three-way valve interface one, two-way valve interface and three-way valve interface, three-way valve interface one is connected the end of intaking of outlet pipe, two-way valve interface connects the play water end of outlet pipe, three-way valve interface three is connected the outlet pipe the end of intaking on branch road, the outlet pipe the end of intaking on branch road is connected the outlet pipe the end of intaking.
Further, the first heat exchanger is a fin type heat exchanger.
Further, the second heat exchanger is a shell-and-tube heat exchanger.
Further, the three-way valve is an electric proportional three-way valve.
Further, the throttling device is an electronic expansion valve.
Furthermore, a water supplementing system is connected to the indirect natural refrigeration loop.
Further, the intermediate heat exchanger is a plate heat exchanger.
After the technical scheme is adopted, the invention has the beneficial effects that a compressor, a four-way valve, a first heat exchanger, a throttling device and a second heat exchanger of a cold water (heat pump) unit with an indirect natural cooling function for an operating room are sequentially connected through a pipeline to form a refrigerating or heating circulation loop, a fan is arranged at the first heat exchanger, and a water outlet pipe and a water return pipe are connected to the second heat exchanger; the water pump is connected with the intermediate heat exchanger through a pipeline to form a natural refrigeration loop; one branch of the water outlet pipe flows through the intermediate heat exchanger and then is converged into the water outlet pipe. When the external temperature is low, the cold water (heat pump) unit with the indirect natural cooling function can reasonably utilize the cold source of the external environment, the circulating cooling water in the natural cooling loop is cooled in the low-temperature environment, the water temperature of the use side is indirectly reduced through secondary heat exchange of the intermediate heat exchanger, the compressor-free operation refrigeration can be realized, and the energy conservation and emission reduction are realized.
Drawings
Fig. 1 is a schematic structural diagram of a cold water (heat pump) unit with an indirect natural cooling function for an operating room of the invention;
in the drawings, the direction of the arrow indicates the flow direction of water;
in the figure: 1-compressor, 2-four-way valve, 21-four-way valve interface I, 22-four-way valve interface II, 23-four-way valve interface III, 24-four-way valve interface IV, 3-fan, 4-fin heat exchanger, 5-electronic expansion valve, 6-shell-and-tube heat exchanger, 7-air cooler, 8-water pump, 9-intermediate heat exchanger, 91-heat exchanger interface I, 92-heat exchanger interface II, 93-heat exchanger interface III, 94-heat exchanger interface IV, 10-electric proportion three-way valve, 101-three-way valve interface I, 102-three-way valve interface II, 103-three-way valve interface III, 11-water outlet pipe, 12-water return pipe, and 13-water replenishing system.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1, a cold water (heat pump) set with indirect natural cooling function for an operating room includes: the system comprises a compressor 1, a four-way valve 2, a first heat exchanger, a throttling device and a second heat exchanger, wherein the compressor 1, the four-way valve 2, the first heat exchanger, the throttling device and the second heat exchanger are sequentially connected through pipelines to form a refrigerating or heating circulation loop. The throttling means is preferably an electronic expansion valve 5. A fan 3 is arranged at one of the heat exchangers, preferably a finned heat exchanger 4. A water outlet pipe 11 and a water return pipe 12 are connected to the second heat exchanger, and the second heat exchanger is preferably a shell-and-tube heat exchanger 6.
The cold water (heat pump) unit with the indirect natural cooling function for the operating room further comprises a water pump 8 and an intermediate heat exchanger 9, wherein the intermediate heat exchanger 9 is preferably a plate heat exchanger. The water pump 8 is connected with the intermediate heat exchanger 9 through a pipeline to form an indirect natural refrigeration loop; one branch of the water outlet pipe 11 flows through the intermediate heat exchanger 9 and then is converged into the water outlet pipe 11.
The cold water (heat pump) unit with the indirect natural cooling function for the operating room further comprises an air cooler 7, the air cooler 7 is connected in series in the indirect natural cooling loop, the air cooler 7 is located on the outer surface of the first heat exchanger, and the air cooler 7 and the first heat exchanger can share one fan 3, so that the number of the fans 3 is reduced. When the ambient temperature is lower, more easily absorb cold volume from the environment, so in order to stabilize total outlet water temperature in adjustable range, the lower the fan 3 rotational speed should be, suitably reduces heat transfer volume.
The rotating speed of the fan 3 is controlled by the ambient temperature, and when the ambient temperature is 18-48 ℃, the fan 3 runs at full load and outputs a 10V signal. When the ambient temperature is 0-18 ℃, the output voltage of the fan 3 is uniformly changed between 10-2V, and the air sharing system can be realized by unloading the number of the fans 3; when the ambient temperature is 0 to-30 ℃, the output voltage of the fan 3 is changed between 10 and 2V.
A cold water (heat pump) unit that is used for having of operating room indirect natural cooling function can the rational utilization external environment cold source, cools off the recirculated cooling water in the indirect natural cooling return circuit when low temperature environment, through intermediate heat exchanger secondary heat transfer, indirectly makes the use side temperature reduce, can realize not needing compressor 1 operation also can prepare cold water, satisfies the refrigeration demand of operating room. The energy consumption of the cold water (heat pump) unit with the indirect natural cooling function in the low-temperature environment can be obviously reduced, the failure rate is low, the service life of the compressor 1 is prolonged, and the use and maintenance cost is reduced.
A three-way valve, preferably an electrically proportional three-way valve 10, is provided on the outlet pipe 11. The electric proportional three-way valve is provided with a three-way valve interface I101, a three-way valve interface II 102 and a three-way valve interface III 103, wherein the three-way valve interface I101 is connected with the water inlet end of the water outlet pipe 11, the three-way valve interface II 102 is connected with the water outlet end of the water outlet pipe 11, the three-way valve interface III 103 is connected with the water inlet end of the branch of the water outlet pipe 11, and the water inlet end of the branch of the water outlet pipe. When the water flows into the intermediate heat exchanger 9, the water in the branch of the water outlet pipe 11 flows in from the heat exchanger connector four 94 of the intermediate heat exchanger 9, flows out from the heat exchanger connector three 93 and flows back to the water outlet pipe 11. The refrigerant in the natural cooling circuit, i.e., cold water, flows into the intermediate heat exchanger 9 through the first heat exchanger port 91, and flows out of the intermediate heat exchanger 9 through the second heat exchanger port 92. The water flowing in from the fourth heat exchanger port 94 exchanges heat with the water flowing in from the first heat exchanger port 91 in the intermediate heat exchanger 9, so that the water flowing out from the third heat exchanger port 93 is cooled, and the water flowing out from the second heat exchanger port 92 is heated.
The temperature of the water at the water outlet end of the water outlet pipe 11 is T1, the temperature of the water at the heat exchanger connector III 93 is T2, and the temperature of the water at the water inlet end of the water outlet pipe 11 is T3. The opening degree of the electric proportional three-way valve 10 is feedback controlled by T1, T2, T3.
When the ambient temperature is 0-45 ℃, the three-way valve interface three 103 of the electric proportional three-way valve 10 is in a fully closed state, and at the moment, T3= T1.
When the ambient temperature is less than 0 ℃, the shell-and-tube heat exchanger 6 has no refrigeration effect, the natural refrigeration loop bears all the cold load, and the T2 is in a controllable range after being subjected to speed regulation by the fan 3 and heat exchange by the intermediate heat exchanger 9. The T1 is controlled by adjusting the opening degrees of the first three-way valve port 101 and the third three-way valve port 103 of the electric proportional three-way valve 10 to control the water amount at two positions.
An automatic water replenishing system 13 is connected to the natural refrigeration circuit to balance the volume change of the refrigerant of the natural refrigeration circuit caused by expansion with heat and contraction with cold. Glycol and a preservative are added into a refrigerant, namely cold water, of a natural refrigeration loop so as to achieve the purposes of preventing freezing and relieving corrosion, and the concentration of the glycol solution is determined according to actual conditions. The indirect cooling avoids the leakage of the solution circulating in the room and the risk of damaging the equipment, and the unit does not need to be additionally added with glycol during installation.
The invention is not only suitable for operating rooms, but also suitable for refrigeration requirements of clean fields such as laboratories, data centers and the like which need a year-round cold source.
The following detailed description will be given of the specific operation process of the cold water (heat pump) set with indirect natural cooling function for operating room using the present invention:
heating mode:
in the heating process, the finned heat exchanger 4 serves as an evaporator, the shell-and-tube heat exchanger 6 serves as a condenser, a heat transfer agent and the like in a pipeline are driven by the compressor 1, flow in the pipeline through a first four-way valve interface 21 of the four-way valve 2, flow out through a fourth four-way valve interface 24 of the four-way valve 2, flow through the shell-and-tube heat exchanger 6, the electronic expansion valve 5 and the finned heat exchanger 4, flow in through a second four-way valve interface 22 of the four-way valve 2, flow out through a third four-way valve interface 23 of the four-way valve 2, and flow back to the. The heating process is the same as the heating principle of the traditional air-cooled cold water (heat pump) unit, and the details are not repeated here.
In a refrigeration mode above 0 ℃, a natural refrigeration loop is not started, the finned heat exchanger 4 is used as a condenser, and the shell-and-tube heat exchanger 6 is used as an evaporator, and specifically the following two conditions are included:
1. when the ambient temperature is 18-48 ℃, the heat exchange agent in the pipeline is driven by the compressor 1, flows into the pipeline through a first four-way valve interface 21 of the four-way valve 2, flows out through a second four-way valve interface 22 of the four-way valve 2, flows through a fourth four-way valve interface 24 of the four-way valve 2 after flowing through the finned heat exchanger 4, the electronic expansion valve 5 and the shell-and-tube heat exchanger 6, flows out through a third four-way valve interface 23 of the four-way valve 2, and flows back to the compressor 1 to form a circulation loop. The system normally operates for refrigeration, and the fan 3 normally operates at full load, which is the same as the traditional refrigeration principle and is not repeated;
2. when the ambient temperature is 0-18 ℃, the condensing pressure is balanced by reducing the rotating speed of the fans 3 or unloading a certain number of fans 3, so that the alarm caused by too low condensing pressure is prevented, the stable operation refrigeration of the unit in a transition season with lower temperature is ensured, and cold water at 7 ℃ is obtained;
cooling mode below 0 ℃:
the compressor 1, the four-way valve 2, the finned heat exchanger 4, the electronic expansion valve 5 and the shell-and-tube heat exchanger 6 are connected in sequence through pipelines to form a refrigeration cycle loop which does not run. Utilize air cooler 7 and natural environment heat transfer cooling circulation cooling water, carry out the secondary heat transfer through intermediate heat exchanger 9 to make the temperature of the branch road normal water of outlet pipe 11 reduce, need not open compressor 1 refrigeration alright be in order to provide cold water for the system, when ambient temperature is lower, from the environment absorbed cold volume when being bigger, cold water is more easily obtained.
Although the temperature difference of 3-5 ℃ exists in the secondary heat exchange of the intermediate heat exchanger 9, the aim of 7 ℃ water outlet in the water outlet pipe 11 can be achieved due to the fact that the environment temperature is far lower than the water return temperature (12 ℃) of the water return pipe 12 and is still in a controllable range.
The technical features (such as the first heat exchanger, the second heat exchanger, the first four-way valve interface, the second four-way valve interface, the third four-way valve interface, the fourth four-way valve interface, the first heat exchanger interface, the second heat exchanger interface, the third heat exchanger interface, the fourth heat exchanger interface, the first three-way valve interface, the second three-way valve interface, the third three-way valve interface, etc.) with the names of serial numbers referred to in this specification are only for distinguishing the technical features, and do not represent the position relationship, the installation sequence, the working sequence, etc. among the technical features.
In the description of the present specification, it is to be understood that the orientation or positional relationship described by the "outer surface" and the like is based on the orientation or positional relationship shown in the drawings, and is only for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
The present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make various modifications without creative efforts from the above-described conception, and fall within the scope of the present invention.
Claims (9)
1. Cold water (heat pump) unit with indirect natural cooling function for operating room, comprising: the system comprises a compressor, a four-way valve, a first heat exchanger, a throttling device and a second heat exchanger, wherein the compressor, the four-way valve, the first heat exchanger, the throttling device and the second heat exchanger are sequentially connected through pipelines to form a refrigerating or heating circulation loop; a fan is arranged at one position of the heat exchanger; a water outlet pipe and a water return pipe are connected to the second heat exchanger; it is characterized in that the preparation method is characterized in that,
the cold water (heat pump) unit with the indirect natural cooling function for the operating room further comprises a water pump and an intermediate heat exchanger, wherein the water pump and the intermediate heat exchanger are connected through a pipeline to form an indirect natural cooling loop;
and one branch of the water outlet pipe flows through the intermediate heat exchanger and then is converged into the water outlet pipe.
2. The cooling water (heat pump) unit with indirect natural cooling function for operating rooms as claimed in claim 1, wherein the cooling water (heat pump) unit with indirect natural cooling function for operating rooms further comprises an air cooler connected in series to the indirect natural cooling circuit, the air cooler being located on the outer surface of the first heat exchanger.
3. The cooling water (heat pump) unit with indirect natural cooling function for operating rooms as claimed in claim 2, wherein the outlet pipe is provided with a three-way valve, the three-way valve is provided with a first three-way valve interface, a second three-way valve interface and a third three-way valve interface, the first three-way valve interface is connected with the water inlet end of the outlet pipe, the second three-way valve interface is connected with the water outlet end of the outlet pipe, the third three-way valve interface is connected with the water inlet end of the branch of the outlet pipe, and the water inlet end of the branch of the outlet pipe is connected with the water inlet end of the outlet pipe.
4. The cooling water (heat pump) unit with indirect natural cooling function for operating rooms as claimed in claim 1, wherein the first heat exchanger is a finned heat exchanger.
5. The cold water (heat pump) unit with the indirect natural cooling function for the operating room as claimed in claim 1, wherein the second heat exchanger is a shell-and-tube heat exchanger.
6. The cooling water (heat pump) unit with indirect natural cooling function for operating rooms according to claim 3, wherein the three-way valve is an electric proportional three-way valve.
7. The cooling water (heat pump) unit with indirect natural cooling function for operating rooms according to claim 1, wherein the throttling means is an electronic expansion valve.
8. The cooling water (heat pump) unit with indirect natural cooling function for operating rooms as claimed in claim 1, wherein a water replenishing system is connected to the indirect natural cooling loop.
9. The cooling water (heat pump) unit with indirect natural cooling function for operating rooms according to claim 1, wherein the intermediate heat exchanger is a plate heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110213244.8A CN112556050A (en) | 2021-02-26 | 2021-02-26 | Cold water (heat pump) unit with indirect natural cooling function for operating room |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110213244.8A CN112556050A (en) | 2021-02-26 | 2021-02-26 | Cold water (heat pump) unit with indirect natural cooling function for operating room |
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| Publication Number | Publication Date |
|---|---|
| CN112556050A true CN112556050A (en) | 2021-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110213244.8A Withdrawn CN112556050A (en) | 2021-02-26 | 2021-02-26 | Cold water (heat pump) unit with indirect natural cooling function for operating room |
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| CN (1) | CN112556050A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5494741A (en) * | 1978-01-10 | 1979-07-26 | Mitsui Eng & Shipbuild Co Ltd | Chilled water facility for local district cooling and heating energy plant |
| CN104482637A (en) * | 2014-11-19 | 2015-04-01 | 浙江华健医用工程有限公司 | Control system and control method for special two/four-pipe air conditioner for clean operating room |
| CN111442446A (en) * | 2020-05-08 | 2020-07-24 | 台佳空调系统(江苏)有限公司 | Integrated double-cold-source water chilling unit |
| CN212274158U (en) * | 2020-05-08 | 2021-01-01 | 台佳空调系统(江苏)有限公司 | Double-cold-source water chilling unit refrigerating system based on indirect evaporative cooling technology |
-
2021
- 2021-02-26 CN CN202110213244.8A patent/CN112556050A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5494741A (en) * | 1978-01-10 | 1979-07-26 | Mitsui Eng & Shipbuild Co Ltd | Chilled water facility for local district cooling and heating energy plant |
| CN104482637A (en) * | 2014-11-19 | 2015-04-01 | 浙江华健医用工程有限公司 | Control system and control method for special two/four-pipe air conditioner for clean operating room |
| CN111442446A (en) * | 2020-05-08 | 2020-07-24 | 台佳空调系统(江苏)有限公司 | Integrated double-cold-source water chilling unit |
| CN212274158U (en) * | 2020-05-08 | 2021-01-01 | 台佳空调系统(江苏)有限公司 | Double-cold-source water chilling unit refrigerating system based on indirect evaporative cooling technology |
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Application publication date: 20210326 |