US20230126797A1 - Auxiliary circulation water pump for circulating water system - Google Patents
Auxiliary circulation water pump for circulating water system Download PDFInfo
- Publication number
- US20230126797A1 US20230126797A1 US17/509,082 US202117509082A US2023126797A1 US 20230126797 A1 US20230126797 A1 US 20230126797A1 US 202117509082 A US202117509082 A US 202117509082A US 2023126797 A1 US2023126797 A1 US 2023126797A1
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- United States
- Prior art keywords
- pipe
- water pumps
- water
- condenser
- egress
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 239000002826 coolant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007420 reactivation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/04—Details of condensers
- F25B2339/047—Water-cooled condensers
Definitions
- the present invention relates to an industrial recirculation water cooling system, and more particularly to an auxiliary circulation water pump for circulating water system that offers effects of operation stability and energy saving.
- cooling medium such as seawater, freshwater, and coolant
- condenser For various plants or workshops, such as power plants, steam/electric co-generation plants, chemical works, and incineration plants, cooling medium, such as seawater, freshwater, and coolant, must be provided to a condenser for operation.
- large-capacity circulation water pumps are set in full-load operation in order to supply cooling water for condensation of the steam exhaust from a steam turbine and to keep vacuum of the condenser (around 7.45 kPaA) for ensuring output of the steam turbine.
- a primary steam stop valve of the steam turbine is closed as stipulated in operation guides. Therefore, the steam exhausts from the steam turbine into the condenser is cut off.
- a conventional arrangement of circulating water system generally includes two circulation water pumps A of 50% or three recirculation water pumps A of 33.3% for full load operation. In a standby state, the circulation water flow demand could be less than 3% of the design flow at full load operation.
- operators usually need to select one circulation water pump (of which the capacity is around 50% as an example for combined cycle power plant units) in operation. Operators can select to run the single pump at the design point or at minimum flow point (which is around 40% of the design flow or more; depending on equipment feature).
- pump operation can be kept more stable and the risk of system tripping could be relatively low as smooth flow regulation for target flow rate setting.
- the power consumption for such condition is extremely high (a single pump consuming around 2.5 MW; taking Tatan Power Plant gas-fired combined cycle units 1-6 of Taiwan Power Company as an example; each unit with 720 MW output) due to higher flow rate although higher pump efficiency around 90% at design point.
- the operation of the pump is relatively unstable, and the system flowrate regulation and control is relatively poor and the risk of tripping is relatively high.
- the circulation water pump trips, the circulation water system cannot be maintained and the vacuum of the condenser will be broken.
- Re-activation of the machine set requires re-establishing the circulation water system and re-building the condenser vacuum.
- Such re-activation is time-consuming and energy-consuming and affecting the capacity of power supply and machine set availability.
- the efficiency of the pump is relatively poor (around 35%-45%) and the power consumption is only slightly different from that for the design point operation. Consequently, an operator often prefers to run single pump operating at the design point. Both cases lead to a high consumption of auxiliary power.
- the issue that the present invention is made to overcome is to reduce energy consumption for a machine set in a standby state and also to ensure stability of the machine set.
- an auxiliary circulation water pump for circulating water system which comprises: a condenser, which connects with a first ingress pipe, a second ingress pipe, a first egress pipe, and a second egress pipe; a plurality of first water pumps, which are each connected to a first valve, each of the first valves being connected to a first pipe interconnected with each other, each of the first pipes being connected to the first ingress pipe, each of the first water pumps having a capacity of 50% or 33.3%; a plurality of second water pumps, which are each connected to a second valve, each of the second valves being connected to a second pipe interconnected with each other, each of the second pipes being connected to the second ingress pipe of the condenser, each of the second water pumps having a capacity of 3-10%; and a control unit, which is operable, when all of the first water pumps shut down as machine set at standby state, to close each of the first valves and activates each of the second water pumps
- FIG. 1 is a schematic view showing a conventional circulation water system.
- FIG. 2 is a schematic view showing a first embodiment of the present invention.
- FIG. 3 is a schematic view showing a second embodiment of the present invention.
- a condenser 10 which comprises a first ingress pipe 11 , a first egress pipe 13 , and a second egress pipe 14 , wherein the first egress pipe 13 is provided with a main butterfly valve 131 , and the second egress pipe 14 is provided with a bypass valve 141 ;
- each of the first water pumps 20 which are each connected to a first valve 21 , wherein each of the first valves 21 is connected to a first pipe 22 interconnected with each other, and each of the first pipes 22 is connected to the first ingress pipe 11 , and each of the first water pumps 20 has a capacity of 50% or 33.3%;
- each of the second valves 31 is connected to a second pipe 32 that is connected to the first pipes 22 , and each of the second water pumps 30 has a capacity of 3-10%, wherein the bypass valve 141 has a design flowrate that corresponds to and matches with the capacity of each of the second water pumps 30 ;
- control unit (not shown), which is operable, when each of the first water pumps 20 enters a standby state, to close each of the first valves 21 and the main butterfly valve 131 and subsequently activate each of the second water pumps 30 and each of the second valves 31 , wherein each of the second water pumps 30 provides the condenser 10 to proceed with a circulation water operation and allows vacuum of the condenser 10 to be kept at design condition (say 7.45 kPaA), and each of the second water pumps 30 supplies water through the second pipe 32 , the first pipe 22 , and the first ingress pipe 11 into the condenser 10 and then discharging through the second egress pipe 14 .
- an auxiliary circulation water pump for circulating water system which comprises: a condenser 10 , which comprises a first ingress pipe 11 , a second ingress pipe 12 , a first egress pipe 13 , and a second egress pipe 14 , wherein the first egress pipe is provided with a main butterfly valve 131 , and the second egress pipe 14 is provided with a bypass valve 141 ;
- each of the first water pumps 20 which are each connected to a first valve 21 , wherein each of the first valves 21 is connected to a first pipe 22 interconnected with each other, and each of the first pipes 22 is connected to the first ingress pipe 11 , and each of the first water pumps 20 has a capacity of 50% or 33.3%, and each of the first water pumps 20 supplies water through each of the first pipes 22 and the first ingress pipe 11 into the condenser 10 and then discharging through the first egress pipe 13 ;
- each of the second water pumps 30 which are each connected to a second valve 31 , wherein each of the second valves 31 is connected to a second pipe 32 interconnected with each other, and each of the second pipes 32 is connected to the second ingress pipe 12 of the condenser 10 , and each of the second water pumps 30 has a capacity of 3-10%, wherein the bypass valve 141 has a design flowrate that corresponds to and matches with the capacity of each of the second water pumps; and
- control unit (not shown), which is operable, when each of the first water pumps 20 enters a standby state, to close each of the first valves 21 and the main butterfly valve 131 and activate each of the second water pumps 30 and each of the second valves 31 , wherein each of the second water pumps 30 supplies water through each of the second pipes 32 and the second ingress pipe 12 into the condenser 10 and then discharging through the second egress pipe 14 , so that the bypass valve 141 allows vacuum of the condenser to be kept at design condition (say 7.45 kPaA), to thereby achieve an effect of stable operation and reduction of energy consumption; and
- bypass valve 141 has a flowrate that corresponds to and matches with the capacity of each of the second water pumps 30 , namely due to the capacity being 3-10%, each of the second water pumps is operable in collaboration with the bypass valve 141 that has a reduced flowrate in order to allows operation of each of the second water pumps 30 to be set through regulation of the flowrate of the bypass valve 141 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An auxiliary circulation water pump for circulating water system is provided, including a condenser having first and second ingress pipes and first and second egress pipes; first water pumps each having a capacity of 50% or 33.3% and connected to a first valve connected to the first ingress pipe; second water pumps each having a capacity of 3-10% and connected to a second valve connected to the second ingress pipe; and a control unit, which is operable, when all of the first water pumps shut down as machine set at standby state, to close the first valves and activates the second water pumps and the second valves, the second water pumps supplying water through the second ingress pipe into the condenser and then discharging through the second egress pipe, and also keeping vacuum of the condenser at design condition (say 7.45 kPaA).
Description
- The present invention relates to an industrial recirculation water cooling system, and more particularly to an auxiliary circulation water pump for circulating water system that offers effects of operation stability and energy saving.
- For various plants or workshops, such as power plants, steam/electric co-generation plants, chemical works, and incineration plants, cooling medium, such as seawater, freshwater, and coolant, must be provided to a condenser for operation. In normal operation, large-capacity circulation water pumps are set in full-load operation in order to supply cooling water for condensation of the steam exhaust from a steam turbine and to keep vacuum of the condenser (around 7.45 kPaA) for ensuring output of the steam turbine. When the machine set is in a standby state, a primary steam stop valve of the steam turbine is closed as stipulated in operation guides. Therefore, the steam exhausts from the steam turbine into the condenser is cut off. Under such condition, only fraction of bypass steam, gland steam, vent piping steam, and drainage of condensate in steam pipe, etc. will be routed into the condenser. Since the thermal loading at machine set standby condition is far less than that at design point, the water flow demand for the circulation water system can be greatly reduced in order to lower the consumption of auxiliary power for the machine set in the standby state.
- Referring to
FIG. 1 , a conventional arrangement of circulating water system generally includes two circulation water pumps A of 50% or three recirculation water pumps A of 33.3% for full load operation. In a standby state, the circulation water flow demand could be less than 3% of the design flow at full load operation. In order to save auxiliary power, operators usually need to select one circulation water pump (of which the capacity is around 50% as an example for combined cycle power plant units) in operation. Operators can select to run the single pump at the design point or at minimum flow point (which is around 40% of the design flow or more; depending on equipment feature). - For operation being selected at the design point, pump operation can be kept more stable and the risk of system tripping could be relatively low as smooth flow regulation for target flow rate setting. However, the power consumption for such condition is extremely high (a single pump consuming around 2.5 MW; taking Tatan Power Plant gas-fired combined cycle units 1-6 of Taiwan Power Company as an example; each unit with 720 MW output) due to higher flow rate although higher pump efficiency around 90% at design point.
- For operation being selected at the minimum flow point, the operation of the pump is relatively unstable, and the system flowrate regulation and control is relatively poor and the risk of tripping is relatively high. Once the circulation water pump trips, the circulation water system cannot be maintained and the vacuum of the condenser will be broken. Re-activation of the machine set requires re-establishing the circulation water system and re-building the condenser vacuum. Such re-activation is time-consuming and energy-consuming and affecting the capacity of power supply and machine set availability. While in minimum flow point operation, the efficiency of the pump is relatively poor (around 35%-45%) and the power consumption is only slightly different from that for the design point operation. Consequently, an operator often prefers to run single pump operating at the design point. Both cases lead to a high consumption of auxiliary power. Thus, the issue that the present invention is made to overcome is to reduce energy consumption for a machine set in a standby state and also to ensure stability of the machine set.
- In view of the above problem, the present invention provides an auxiliary circulation water pump for circulating water system, which comprises: a condenser, which connects with a first ingress pipe, a second ingress pipe, a first egress pipe, and a second egress pipe; a plurality of first water pumps, which are each connected to a first valve, each of the first valves being connected to a first pipe interconnected with each other, each of the first pipes being connected to the first ingress pipe, each of the first water pumps having a capacity of 50% or 33.3%; a plurality of second water pumps, which are each connected to a second valve, each of the second valves being connected to a second pipe interconnected with each other, each of the second pipes being connected to the second ingress pipe of the condenser, each of the second water pumps having a capacity of 3-10%; and a control unit, which is operable, when all of the first water pumps shut down as machine set at standby state, to close each of the first valves and activates each of the second water pumps and each of the second valves, each of the second water pumps supplying water through each of the second pipes and the second ingress pipe into the condenser and then discharging through the second egress pipe, thereby, keeping vacuum of the condenser at design condition (say 7.45 kPaA).
-
FIG. 1 is a schematic view showing a conventional circulation water system. -
FIG. 2 is a schematic view showing a first embodiment of the present invention. -
FIG. 3 is a schematic view showing a second embodiment of the present invention. - To expound the details of the present invention, as well as the efficacy achieved thereby, embodiments will be provided with reference to the drawings. Referring to
FIG. 2 , an auxiliary circulation water pump for circulating water system according to a first embodiment of the present invention comprises: - a
condenser 10, which comprises afirst ingress pipe 11, afirst egress pipe 13, and asecond egress pipe 14, wherein thefirst egress pipe 13 is provided with amain butterfly valve 131, and thesecond egress pipe 14 is provided with abypass valve 141; - a plurality of
first water pumps 20, which are each connected to afirst valve 21, wherein each of thefirst valves 21 is connected to afirst pipe 22 interconnected with each other, and each of thefirst pipes 22 is connected to thefirst ingress pipe 11, and each of thefirst water pumps 20 has a capacity of 50% or 33.3%; - a plurality of
second water pumps 30, which are each connected to asecond valve 31, wherein each of thesecond valves 31 is connected to asecond pipe 32 that is connected to thefirst pipes 22, and each of thesecond water pumps 30 has a capacity of 3-10%, wherein thebypass valve 141 has a design flowrate that corresponds to and matches with the capacity of each of thesecond water pumps 30; and - a control unit (not shown), which is operable, when each of the
first water pumps 20 enters a standby state, to close each of thefirst valves 21 and themain butterfly valve 131 and subsequently activate each of thesecond water pumps 30 and each of thesecond valves 31, wherein each of thesecond water pumps 30 provides thecondenser 10 to proceed with a circulation water operation and allows vacuum of thecondenser 10 to be kept at design condition (say 7.45 kPaA), and each of thesecond water pumps 30 supplies water through thesecond pipe 32, thefirst pipe 22, and thefirst ingress pipe 11 into thecondenser 10 and then discharging through thesecond egress pipe 14. - Referring to
FIG. 3 , an auxiliary circulation water pump for circulating water system according to a second embodiment of the present invention is provided, which comprises: acondenser 10, which comprises afirst ingress pipe 11, asecond ingress pipe 12, afirst egress pipe 13, and asecond egress pipe 14, wherein the first egress pipe is provided with amain butterfly valve 131, and thesecond egress pipe 14 is provided with abypass valve 141; - a plurality of
first water pumps 20, which are each connected to afirst valve 21, wherein each of thefirst valves 21 is connected to afirst pipe 22 interconnected with each other, and each of thefirst pipes 22 is connected to thefirst ingress pipe 11, and each of thefirst water pumps 20 has a capacity of 50% or 33.3%, and each of thefirst water pumps 20 supplies water through each of thefirst pipes 22 and thefirst ingress pipe 11 into thecondenser 10 and then discharging through thefirst egress pipe 13; - a plurality of
second water pumps 30, which are each connected to asecond valve 31, wherein each of thesecond valves 31 is connected to asecond pipe 32 interconnected with each other, and each of thesecond pipes 32 is connected to thesecond ingress pipe 12 of thecondenser 10, and each of thesecond water pumps 30 has a capacity of 3-10%, wherein thebypass valve 141 has a design flowrate that corresponds to and matches with the capacity of each of the second water pumps; and - a control unit (not shown), which is operable, when each of the
first water pumps 20 enters a standby state, to close each of thefirst valves 21 and themain butterfly valve 131 and activate each of thesecond water pumps 30 and each of thesecond valves 31, wherein each of thesecond water pumps 30 supplies water through each of thesecond pipes 32 and thesecond ingress pipe 12 into thecondenser 10 and then discharging through thesecond egress pipe 14, so that thebypass valve 141 allows vacuum of the condenser to be kept at design condition (say 7.45 kPaA), to thereby achieve an effect of stable operation and reduction of energy consumption; and - wherein the
bypass valve 141 has a flowrate that corresponds to and matches with the capacity of each of thesecond water pumps 30, namely due to the capacity being 3-10%, each of the second water pumps is operable in collaboration with thebypass valve 141 that has a reduced flowrate in order to allows operation of each of thesecond water pumps 30 to be set through regulation of the flowrate of thebypass valve 141.
Claims (4)
1. An auxiliary circulation water pump for circulating water system, comprising:
a condenser, which comprises a first ingress pipe, a second ingress pipe, a first egress pipe, and a second egress pipe;
a plurality of first water pumps, which are each connected to a first valve, each of the first valves being connected to a first pipe interconnected with each other, each of the first pipes being connected to the first ingress pipe, each of the first water pumps having a capacity of 50% or 33.3%, each of the first water pumps supplying water through each of the first pipe and the first ingress pipe into the condenser and then discharging through the first egress pipe;
a plurality of second water pumps, which are each connected to a second valve, each of the second valves being connected to a second pipe interconnecting with each other, each of the second pipes being connected to the second ingress pipe of the condenser, each of the second water pumps having a capacity of 3-10%; and
a control unit, which is operable, when all of the first water pumps shut down as machine set at standby state, to close each of the first valves and activate each of the second water pumps and each of the second valves, each of the second water pumps supplying water through each of the second pipe and the second ingress pipe into the condenser and then discharging through the second egress pipe, and also keeping vacuum of the condenser at a predetermined level.
2. The auxiliary circulation water pump for circulating water system according to claim 1 , wherein the first egress pipe is provided with a main butterfly valve, and the second egress pipe is provided with a bypass valve, the bypass valve having a flowrate corresponding to and matching with the capacity of each of the second water pumps.
3. An auxiliary circulation water pump for circulating water system, comprising:
a condenser, which comprises a first ingress pipe, a first egress pipe, and a second egress pipe;
a plurality of first water pumps, which are each connected to a first valve, each of the first valves being connected to a first pipe interconnected with each other, each of the first pipes being connected to the first ingress pipe, each of the first water pumps having a capacity of 50% or 33.3%;
a plurality of second water pumps, which are each connected to a second valve, each of the second valves being connected to a second pipe, each of the second pipes being connected to the first pipes, each of the second water pumps having a capacity of 3-10%; and
a control unit, which is operable, when all of the first water pumps shut down as machine set at standby state, to activate each of the second water pumps, each of the second water pumps providing the condenser to proceed with a circulation water operation and allowing vacuum of the condenser to be kept at a predetermined level, each of the second water pumps supplying water through each of the second pipes, the first pipe, and the first ingress pipe into the condenser and then discharging through the second egress pipe.
4. The auxiliary circulation water pump for circulating water system according to claim 1 , wherein the first egress pipe is provided with a main butterfly valve, and the second egress pipe is provided with a bypass valve, the bypass valve having a flowrate corresponding to and matching with the capacity of each of the second water pumps.
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US17/509,082 US20230126797A1 (en) | 2021-10-25 | 2021-10-25 | Auxiliary circulation water pump for circulating water system |
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US17/509,082 US20230126797A1 (en) | 2021-10-25 | 2021-10-25 | Auxiliary circulation water pump for circulating water system |
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US17/509,082 Abandoned US20230126797A1 (en) | 2021-10-25 | 2021-10-25 | Auxiliary circulation water pump for circulating water system |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090020173A1 (en) * | 2006-02-23 | 2009-01-22 | David Man Chu Lau | Industrial process efficiency method and system |
TW201804113A (en) * | 2016-07-15 | 2018-02-01 | 犬魔建物性能私人有限公司 | Method for improving operational efficiency of a cooling system through retrofitting a building with a master controller |
US20180272392A1 (en) * | 2017-03-24 | 2018-09-27 | Karcher North America, Inc. | Systems and methods for managing heat transfer in a pressure washer |
CN111197784A (en) * | 2020-03-02 | 2020-05-26 | 上海电气电站环保工程有限公司 | Auxiliary heating system for condenser of steam turbine set |
-
2021
- 2021-10-25 US US17/509,082 patent/US20230126797A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090020173A1 (en) * | 2006-02-23 | 2009-01-22 | David Man Chu Lau | Industrial process efficiency method and system |
TW201804113A (en) * | 2016-07-15 | 2018-02-01 | 犬魔建物性能私人有限公司 | Method for improving operational efficiency of a cooling system through retrofitting a building with a master controller |
US20180272392A1 (en) * | 2017-03-24 | 2018-09-27 | Karcher North America, Inc. | Systems and methods for managing heat transfer in a pressure washer |
CN111197784A (en) * | 2020-03-02 | 2020-05-26 | 上海电气电站环保工程有限公司 | Auxiliary heating system for condenser of steam turbine set |
Non-Patent Citations (2)
Title |
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Challa, Method for improving operational efficiency of a cooling system through retrofitting a building with a master controller (TW201804113A) English Translation, 02/01/2018, Whole Document (Year: 2018) * |
Qu et al. (CN111197784A), English Translation, Turboset condenser assisted heating system, 05/26/2020, Whole Document (Year: 2020) * |
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