CN221802113U - Device for producing low temperature water - Google Patents
Device for producing low temperature water Download PDFInfo
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- CN221802113U CN221802113U CN202323339011.6U CN202323339011U CN221802113U CN 221802113 U CN221802113 U CN 221802113U CN 202323339011 U CN202323339011 U CN 202323339011U CN 221802113 U CN221802113 U CN 221802113U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 219
- 238000001816 cooling Methods 0.000 claims abstract description 62
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical group [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims abstract description 29
- 238000004140 cleaning Methods 0.000 claims abstract description 15
- 239000010865 sewage Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 9
- 239000003595 mist Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract 2
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 3
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- Sorption Type Refrigeration Machines (AREA)
Abstract
本实用新型公开的制取低温水的装置，包括蒸汽型溴化锂机组，蒸汽型溴化锂机组出水口通过低温水上水管连接有竖向设置的空冷塔，空冷塔通过低温水回水管与蒸汽型溴化锂机组进水口连接，空冷塔通过常温水回水管形成清洗回路。本实用新型的制取低温水的装置，通过使用蒸汽型溴化锂机组代替传统水冷塔，减少占地面积及建筑面积，同时节省了大量水资源和污氮气资源，为公司后期运行中氮气使用方面提供了保障。
The low-temperature water preparation device disclosed in the utility model comprises a steam-type lithium bromide unit, the water outlet of the steam-type lithium bromide unit is connected to a vertically arranged air cooling tower through a low-temperature water upper water pipe, the air cooling tower is connected to the water inlet of the steam-type lithium bromide unit through a low-temperature water return pipe, and the air cooling tower forms a cleaning loop through a normal temperature water return pipe. The low-temperature water preparation device of the utility model reduces the floor space and building area by using a steam-type lithium bromide unit to replace a traditional water cooling tower, and at the same time saves a large amount of water resources and polluted nitrogen resources, providing a guarantee for the use of nitrogen in the company's later operation.
Description
技术领域Technical Field
本实用新型属于制冷设备技术领域，具体涉及制取低温水的装置。The utility model belongs to the technical field of refrigeration equipment, and in particular relates to a device for preparing low-temperature water.
背景技术Background Art
传统空分行业中的预冷系统主要利用反流的污氮气或者氮气的不饱和性给水降温获得冷冻水，再以冷冻水为介质，给进入纯化系统的空气降温，同时对空气进行洗涤，清除空气中的灰尘以及可溶于水中的酸性介质，如H2S、SO2等。但此方法有一定的局限性，一方面要求用户有足够的干燥污氮气，另一方面要求地区水资源丰富。由于本项目地处陕北水资源严重缺乏地区，加之本项目为合成氨工艺需要用大量氮气，导致污氮气气量不足，无法满足制取冷冻水的需求。The precooling system in the traditional air separation industry mainly uses the reflux of dirty nitrogen or the unsaturated nitrogen to cool the water to obtain chilled water, and then uses the chilled water as the medium to cool the air entering the purification system, and at the same time wash the air to remove dust in the air and acidic media soluble in water, such as H2S , SO2 , etc. However, this method has certain limitations. On the one hand, it requires users to have sufficient dry dirty nitrogen, and on the other hand, it requires abundant water resources in the region. Since this project is located in northern Shaanxi, where water resources are seriously scarce, and this project requires a large amount of nitrogen for the synthetic ammonia process, the amount of dirty nitrogen is insufficient, which cannot meet the demand for producing chilled water.
实用新型内容Utility Model Content
本实用新型的目的是提供制取低温水的装置，通过使用蒸汽型溴化锂机组代替传统水冷塔，节省了大量水资源和污氮气资源。The utility model aims to provide a device for preparing low-temperature water, which saves a lot of water resources and polluted nitrogen resources by using a steam-type lithium bromide unit to replace a traditional water cooling tower.
本实用新型所采用的技术方案是，制取低温水的装置，包括蒸汽型溴化锂机组，蒸汽型溴化锂机组出水口通过低温水上水管连接有竖向设置的空冷塔，空冷塔通过低温水回水管与蒸汽型溴化锂机组进水口连接，空冷塔通过常温水回水管形成清洗回路。The technical scheme adopted by the utility model is a device for preparing low-temperature water, comprising a steam-type lithium bromide unit, a water outlet of the steam-type lithium bromide unit is connected to a vertically arranged air cooling tower through a low-temperature water upper water pipe, the air cooling tower is connected to a water inlet of the steam-type lithium bromide unit through a low-temperature water return pipe, and the air cooling tower forms a cleaning loop through a normal-temperature water return pipe.
本实用新型的特点还在于：The utility model is also characterized in that:
空冷塔通过微量排污管与污水厂连接。The air cooling tower is connected to the sewage treatment plant through a micro-sewage pipe.
低温水上水管上设有低温水泵与第二控制阀。A low-temperature water pump and a second control valve are provided on the low-temperature water upper water pipe.
低温水上水管连接有第一补水管，第一补水管另一端与供水站连接，第一补水管上设有第一补水阀。The low-temperature water supply pipe is connected to a first water supply pipe, the other end of the first water supply pipe is connected to a water supply station, and a first water supply valve is arranged on the first water supply pipe.
空冷塔包括第一集液槽，第一集液槽进水口与低温水上水管连接，第一集液槽出水口与低温水回水管连接；The air cooling tower comprises a first collecting tank, a water inlet of the first collecting tank is connected to a low-temperature water supply pipe, and a water outlet of the first collecting tank is connected to a low-temperature water return pipe;
空冷塔还包括第二集液槽，第二集液槽通过常温水回水管形成清洗回路，常温水回水管上设有常温水泵与第一控制阀；The air cooling tower further comprises a second liquid collecting tank, the second liquid collecting tank forms a cleaning loop through a normal temperature water return pipe, and a normal temperature water pump and a first control valve are arranged on the normal temperature water return pipe;
空冷塔还包括空气进口与空气出口，空气进口设于空冷塔底部外侧，空气进口设于第二集液槽下部，空气出口设于空冷塔顶部，空气出口与第一集液槽之间设有捕雾器。The air cooling tower also includes an air inlet and an air outlet. The air inlet is arranged outside the bottom of the air cooling tower, the air inlet is arranged at the lower part of the second collecting tank, the air outlet is arranged at the top of the air cooling tower, and a mist collector is arranged between the air outlet and the first collecting tank.
低温水回水管与常温水回水管通过常温水补水管连通，常温水补水管上设有第二补水阀。The low-temperature water return pipe is connected to the normal-temperature water return pipe through a normal-temperature water replenishment pipe, and a second replenishment valve is arranged on the normal-temperature water replenishment pipe.
本实用新型的有益效果是：The beneficial effects of the utility model are:
本实用新型提供的制取低温水的装置，通过使用蒸汽型溴化锂机组代替传统水冷塔，减少占地面积及建筑面积，同时节省了大量水资源和污氮气资源，为公司后期运行中氮气使用方面提供了保障。The device for preparing low-temperature water provided by the utility model uses a steam-type lithium bromide unit instead of a traditional water cooling tower, thereby reducing the floor space and building area, while saving a large amount of water resources and polluted nitrogen resources, and providing a guarantee for the use of nitrogen in the company's later operation.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是本实用新型制取低温水的装置的结构示意图。FIG1 is a schematic structural diagram of a device for producing low-temperature water according to the present invention.
图中，1.空冷塔，2.蒸汽型溴化锂机组，3.低温水泵，4.常温水泵，5.低温水上水管，6.第一补水管，7.常温水补水管，8.常温水回水管，9.微量排污管，10.低温水回水管，11.第一补水阀，12.第二补水阀，13.第一控制阀，14.第二控制阀，15.第一集液槽，16.第二集液槽，17.捕雾器，18.空气进口，19.空气出口。In the figure, 1. air cooling tower, 2. steam type lithium bromide unit, 3. low temperature water pump, 4. normal temperature water pump, 5. low temperature water supply pipe, 6. first water supply pipe, 7. normal temperature water supply pipe, 8. normal temperature water return pipe, 9. trace sewage pipe, 10. low temperature water return pipe, 11. first water supply valve, 12. second water supply valve, 13. first control valve, 14. second control valve, 15. first collecting tank, 16. second collecting tank, 17. mist collector, 18. air inlet, 19. air outlet.
具体实施方式DETAILED DESCRIPTION
下面结合附图和具体实施方式对本实用新型进行详细说明。The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.
本实用新型提供的制取低温水的装置，如图1所示，包括蒸汽型溴化锂机组2，蒸汽型溴化锂机组2出水口通过低温水上水管5连接有竖向设置的空冷塔1，空冷塔1通过低温水回水管10与蒸汽型溴化锂机组2进水口连接，空冷塔1通过常温水回水管8形成清洗回路；空冷塔1通过微量排污管9与污水厂连接，便于对空气中的灰尘及可溶于水中的酸性介质，如H2S、SO2等进行清洗，从微量排污管9输送至排污厂；低温水上水管5上设有低温水泵3与第二控制阀14，便于对低温水上水管5中的水进行打压控制；低温水上水管5连接有第一补水管6，第一补水管6另一端与供水站连接，便于给低温水上水管5中供水；第一补水管6上设有第一补水阀11；空冷塔1包括第一集液槽15，第一集液槽15进水口与低温水上水管5连接，第一集液槽15出水口与低温水回水管10连接，形成回路，便于蒸汽型溴化锂机组2中制冷的水循环储存在第一集液槽15中；低温水回水管10与常温水回水管8通过常温水补水管7连通，常温水补水管7上设有第二补水阀12，便于给常温水回水管8中供水；空冷塔1还包括第二集液槽16，第二集液槽16通过常温水回水管8形成清洗回路，常温水回水管8上设有常温水泵4与第一控制阀13，便于对常温水回水管8中的水打压控制；空冷塔1还包括空气进口18与空气出口19，空气进口18设于空冷塔1底部外侧，空气进口18设于第二集液槽16下部，空气出口19设于空冷塔1顶部，空气出口19与第一集液槽15之间设有捕雾器17。按传统工艺在设置了水冷塔的情况下，如果需要将水冷塔中590m3/h的水冷却至7℃，大约需要用54万Nm3/h的污氮气，每1万Nm3污氮气每小时可以带走约200kg的水，经此计算可得每年用水约86400吨，每吨原水按11元计算，预估每年可节约支出水费约95万元。The device for preparing low-temperature water provided by the utility model, as shown in FIG1, comprises a steam-type lithium bromide unit 2, the outlet of the steam-type lithium bromide unit 2 is connected to a vertically arranged air cooling tower 1 through a low-temperature water upper water pipe 5, the air cooling tower 1 is connected to the water inlet of the steam-type lithium bromide unit 2 through a low-temperature water return pipe 10, and the air cooling tower 1 forms a cleaning loop through a normal temperature water return pipe 8; the air cooling tower 1 is connected to a sewage treatment plant through a micro-sewage discharge pipe 9, which is convenient for cleaning dust in the air and acidic media soluble in water, such as H2S , SO 2 , etc. for cleaning, and transported to the sewage treatment plant from the trace sewage pipe 9; a low-temperature water pump 3 and a second control valve 14 are provided on the low-temperature water upper water pipe 5, which are convenient for pressure control of the water in the low-temperature water upper water pipe 5; the low-temperature water upper water pipe 5 is connected to the first water supply pipe 6, and the other end of the first water supply pipe 6 is connected to the water supply station, which is convenient for supplying water to the low-temperature water upper water pipe 5; a first water supply valve 11 is provided on the first water supply pipe 6; the air-cooling tower 1 includes a first collecting tank 15, the water inlet of the first collecting tank 15 is connected to the low-temperature water upper water pipe 5, and the water outlet of the first collecting tank 15 is connected to the low-temperature water return pipe 10 to form a loop, which is convenient for the water circulation of refrigeration in the steam-type lithium bromide unit 2 to be stored in the first collecting tank 15; the low-temperature water return pipe 1 0 is connected with the normal temperature water return pipe 8 through the normal temperature water replenishment pipe 7, and the normal temperature water replenishment pipe 7 is provided with a second replenishment valve 12, which is convenient for supplying water to the normal temperature water return pipe 8; the air cooling tower 1 also includes a second collecting tank 16, the second collecting tank 16 forms a cleaning circuit through the normal temperature water return pipe 8, and the normal temperature water return pipe 8 is provided with a normal temperature water pump 4 and a first control valve 13, which is convenient for controlling the water pressure in the normal temperature water return pipe 8; the air cooling tower 1 also includes an air inlet 18 and an air outlet 19, the air inlet 18 is arranged on the outside of the bottom of the air cooling tower 1, the air inlet 18 is arranged at the lower part of the second collecting tank 16, the air outlet 19 is arranged at the top of the air cooling tower 1, and a mist collector 17 is provided between the air outlet 19 and the first collecting tank 15. According to the traditional technology, if 590m3 /h of water in the water cooling tower needs to be cooled to 7℃, about 540,000 Nm3 /h of polluted nitrogen gas is needed. Every 10,000 Nm3 of polluted nitrogen gas can take away about 200kg of water per hour. According to this calculation, the annual water consumption is about 86,400 tons. Calculated at 11 yuan per ton of raw water, it is estimated that the annual water cost can be saved by about 950,000 yuan.
本实用新型提供的制取低温水的装置，其工作原理为：空气从空气进口18进入空冷塔1，经过常温水泵4泵送的常温水对空气进行清洗，对空气中的灰尘及可溶于水中的酸性介质，如H2S、SO2等进行清洗，随后从微量排污管9输送至排污厂，清洗后的空气，经过由低温水泵3泵送的低温水进行降温，随后经过捕雾器17过滤液态水，随后从空气出口19排出。The device for preparing low-temperature water provided by the utility model has the following working principle: air enters the air cooling tower 1 from the air inlet 18, and the air is cleaned by the normal temperature water pumped by the normal temperature water pump 4, and the dust and the acidic medium soluble in water, such as H2S , SO2, etc. in the air are cleaned, and then the air is transported to the sewage treatment plant from the micro-sewage discharge pipe 9, and the cleaned air is cooled by the low temperature water pumped by the low temperature water pump 3, and then the liquid water is filtered by the mist collector 17, and then discharged from the air outlet 19.
实施例1Example 1
本实施例提出的制取低温水的装置，如图1所示，包括蒸汽型溴化锂机组2，蒸汽型溴化锂机组2出水口通过低温水上水管5连接有竖向设置的空冷塔1，空冷塔1通过低温水回水管10与蒸汽型溴化锂机组2进水口连接，空冷塔1通过常温水回水管8形成清洗回路；空冷塔1通过微量排污管9与污水厂连接。The device for producing low-temperature water proposed in this embodiment, as shown in Figure 1, includes a steam-type lithium bromide unit 2, the outlet of the steam-type lithium bromide unit 2 is connected to a vertically arranged air-cooling tower 1 through a low-temperature water upper water pipe 5, the air-cooling tower 1 is connected to the water inlet of the steam-type lithium bromide unit 2 through a low-temperature water return pipe 10, and the air-cooling tower 1 forms a cleaning loop through a normal temperature water return pipe 8; the air-cooling tower 1 is connected to the sewage treatment plant through a trace sewage discharge pipe 9.
实施例2Example 2
本实施例提出的制取低温水的装置，如图1所示，包括蒸汽型溴化锂机组2，蒸汽型溴化锂机组2出水口通过低温水上水管5连接有竖向设置的空冷塔1，空冷塔1通过低温水回水管10与蒸汽型溴化锂机组2进水口连接，空冷塔1通过常温水回水管8形成清洗回路；空冷塔1通过微量排污管9与污水厂连接；低温水上水管5上设有低温水泵3与第二控制阀14；低温水上水管5连接有第一补水管6，第一补水管6另一端与供水站连接，第一补水管6上设有第一补水阀11。The device for preparing low-temperature water proposed in this embodiment, as shown in Figure 1, includes a steam-type lithium bromide unit 2, the water outlet of the steam-type lithium bromide unit 2 is connected to a vertically arranged air-cooling tower 1 through a low-temperature water upper water pipe 5, the air-cooling tower 1 is connected to the water inlet of the steam-type lithium bromide unit 2 through a low-temperature water return pipe 10, and the air-cooling tower 1 forms a cleaning loop through a normal temperature water return pipe 8; the air-cooling tower 1 is connected to the sewage treatment plant through a trace sewage pipe 9; a low-temperature water upper water pipe 5 is provided with a low-temperature water pump 3 and a second control valve 14; the low-temperature water upper water pipe 5 is connected to a first water supply pipe 6, the other end of the first water supply pipe 6 is connected to a water supply station, and a first water supply valve 11 is provided on the first water supply pipe 6.
实施例3Example 3
本实施例提出的制取低温水的装置，如图1所示，包括蒸汽型溴化锂机组2，蒸汽型溴化锂机组2出水口通过低温水上水管5连接有竖向设置的空冷塔1，空冷塔1通过低温水回水管10与蒸汽型溴化锂机组2进水口连接，空冷塔1通过常温水回水管8形成清洗回路；空冷塔1通过微量排污管9与污水厂连接；低温水上水管5上设有低温水泵3与第二控制阀14；低温水上水管5连接有第一补水管6，第一补水管6另一端与供水站连接，第一补水管6上设有第一补水阀11；空冷塔1包括第一集液槽15，第一集液槽15进水口与低温水上水管5连接，第一集液槽15出水口与低温水回水管10连接；空冷塔1还包括第二集液槽16，第二集液槽16通过常温水回水管8形成清洗回路，常温水回水管8上设有常温水泵4与第一控制阀13；空冷塔1还包括空气进口18与空气出口19，空气进口18设于空冷塔1底部外侧，空气进口18设于第二集液槽16下部，空气出口19设于空冷塔1顶部，空气出口19与第一集液槽15之间设有捕雾器17。The device for preparing low-temperature water proposed in this embodiment, as shown in FIG1, comprises a steam-type lithium bromide unit 2, the outlet of the steam-type lithium bromide unit 2 is connected to a vertically arranged air-cooling tower 1 through a low-temperature water upper water pipe 5, the air-cooling tower 1 is connected to the water inlet of the steam-type lithium bromide unit 2 through a low-temperature water return pipe 10, and the air-cooling tower 1 forms a cleaning loop through a normal temperature water return pipe 8; the air-cooling tower 1 is connected to a sewage treatment plant through a trace sewage pipe 9; a low-temperature water upper water pipe 5 is provided with a low-temperature water pump 3 and a second control valve 14; the low-temperature water upper water pipe 5 is connected to a first water supply pipe 6, the other end of the first water supply pipe 6 is connected to a water supply station, and a first water supply valve 11 is provided on the first water supply pipe 6; the air The cooling tower 1 includes a first collecting tank 15, the water inlet of the first collecting tank 15 is connected to the low-temperature water supply pipe 5, and the water outlet of the first collecting tank 15 is connected to the low-temperature water return pipe 10; the air-cooling tower 1 also includes a second collecting tank 16, the second collecting tank 16 forms a cleaning circuit through the normal temperature water return pipe 8, and the normal temperature water return pipe 8 is provided with a normal temperature water pump 4 and a first control valve 13; the air-cooling tower 1 also includes an air inlet 18 and an air outlet 19, the air inlet 18 is arranged on the outside of the bottom of the air-cooling tower 1, the air inlet 18 is arranged at the lower part of the second collecting tank 16, the air outlet 19 is arranged at the top of the air-cooling tower 1, and a mist collector 17 is provided between the air outlet 19 and the first collecting tank 15.
实施例4Example 4
本实施例提出的制取低温水的装置，如图1所示，包括蒸汽型溴化锂机组2，蒸汽型溴化锂机组2出水口通过低温水上水管5连接有竖向设置的空冷塔1，空冷塔1通过低温水回水管10与蒸汽型溴化锂机组2进水口连接，空冷塔1通过常温水回水管8形成清洗回路；空冷塔1通过微量排污管9与污水厂连接；低温水上水管5上设有低温水泵3与第二控制阀14；低温水上水管5连接有第一补水管6，第一补水管6另一端与供水站连接，第一补水管6上设有第一补水阀11；空冷塔1包括第一集液槽15，第一集液槽15进水口与低温水上水管5连接，第一集液槽15出水口与低温水回水管10连接；低温水回水管10与常温水回水管8通过常温水补水管7连通，常温水补水管7上设有第二补水阀12；空冷塔1还包括第二集液槽16，第二集液槽16通过常温水回水管8形成清洗回路，常温水回水管8上设有常温水泵4与第一控制阀13；空冷塔1还包括空气进口18与空气出口19，空气进口18设于空冷塔1底部外侧，空气进口18设于第二集液槽16下部，空气出口19设于空冷塔1顶部，空气出口19与第一集液槽15之间设有捕雾器17。The device for preparing low-temperature water proposed in this embodiment, as shown in Figure 1, includes a steam-type lithium bromide unit 2, the outlet of the steam-type lithium bromide unit 2 is connected to a vertically arranged air-cooling tower 1 through a low-temperature water upper water pipe 5, the air-cooling tower 1 is connected to the water inlet of the steam-type lithium bromide unit 2 through a low-temperature water return pipe 10, and the air-cooling tower 1 forms a cleaning loop through a normal temperature water return pipe 8; the air-cooling tower 1 is connected to the sewage treatment plant through a trace sewage pipe 9; a low-temperature water upper water pipe 5 is provided with a low-temperature water pump 3 and a second control valve 14; the low-temperature water upper water pipe 5 is connected to a first water supply pipe 6, the other end of the first water supply pipe 6 is connected to a water supply station, and a first water supply valve 11 is provided on the first water supply pipe 6; the air-cooling tower 1 includes a first liquid collecting tank 15, and the water inlet of the first liquid collecting tank 15 It is connected to the low-temperature water supply pipe 5, and the outlet of the first collecting tank 15 is connected to the low-temperature water return pipe 10; the low-temperature water return pipe 10 is connected to the normal-temperature water return pipe 8 through the normal-temperature water replenishment pipe 7, and the normal-temperature water replenishment pipe 7 is provided with a second replenishment valve 12; the air-cooling tower 1 also includes a second collecting tank 16, the second collecting tank 16 forms a cleaning circuit through the normal-temperature water return pipe 8, and the normal-temperature water return pipe 8 is provided with a normal-temperature water pump 4 and a first control valve 13; the air-cooling tower 1 also includes an air inlet 18 and an air outlet 19, the air inlet 18 is arranged on the outside of the bottom of the air-cooling tower 1, the air inlet 18 is arranged at the lower part of the second collecting tank 16, the air outlet 19 is arranged at the top of the air-cooling tower 1, and a mist collector 17 is provided between the air outlet 19 and the first collecting tank 15.
Claims (6)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202323339011.6U CN221802113U (en) | 2023-12-07 | 2023-12-07 | Device for producing low temperature water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202323339011.6U CN221802113U (en) | 2023-12-07 | 2023-12-07 | Device for producing low temperature water |
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