【 Weak current College 】 air cooled chiller units and water cooled chiller energy comparison

1. air cooled chillers and cooling refrigerator energy comparison

To a 700kw (200RT) cooling capacity of the refrigerator, for example, in the same condition, air cooling, power consumption for water cooled 185kw, as power and water cooling 140kw with cooling tower water pump and blower power (15kw + 5kw) to 160kw. In addition the circulating water cooling towers in the cooling process of splash and evaporation consumes about 4t/h of water. Due to differences in the areas to be 4t water consumes more power than 25kw, but some areas may not 25kw power consumption. So whether it is air cooled or water-cooled consumes energy are similar. Of course there is the power consumption of the cooling machine, such as Italy RC company 700kw (200RT) refrigerator of input power for 215kw.

In addition also with sea-water cooling, energy-saving due to seawater temperature is maintained at 20 ℃, the cooling effect is very good. But it is close to the sea to take advantage of the building, distance the cost would be multiplied. Use sea water cooling and one-off investment is high.

2, air cooled chiller application areas

Water cooled chillers to wet-bulb temperature, for the wet-bulb temperature changes and the lower areas more suitable. Air cooled chiller to dry-bulb temperature, in one day dry-bulb temperature change large areas use more favourable. When the dry-bulb temperature is lower, the refrigeration effect will be even better.

Cold water unit of COP than air cooling units. In order to improve the air cooling unit COP value, leverage direct evaporative cooling (DEC) expand heat temperature difference. In air cooled condensers and imported by DEC pre-cooling condensers, cooling capacity, power is reduced.

According to information [1] describes the use of DEC technology Shanghai area (t dry = 34 ° c, t and wet = 28.2 ℃) cooling COP from 2.92 to 3.28, Beijing (t ° c, dry = 33.2 t wet = 26.4 ℃) cooling COP from 2.98 to 3.43.

>3, water treatment problem on demand air cooled chiller

Many large cities in the world today faces a shortage of water resources, in order to save water, generally the lavatory, flushing water after treatment and reuse, called in water treatment. Many areas are made in water treatment. But in engineering Tower consumes water has a large scale.

To Shenzhen Association building, for example, the air conditioning cooling water is water throughout the building. In water treatment can only be 341.7t/d of water, and air conditioning cooling tower but consumes 700t/d water, resulting in water represents only half of the cooling water. Due to water quality problems in the Shui also cannot be used as cooling tower makeup water.

Investment in water treatment, covers, and bring the issue of secondary pollution, handling more power in the process. Many people suggested that instead of engaging in water treatment, as if the air conditioning water cooled to air cooled, make the whole design. Building environment requires the use of wind machines.

At present most of the buildings of water-cooled chillers with cooling tower circulation water cooling condensers, cooling tower placed in the building roof, affecting both the architectural appearance of the beautiful and inconsistent with the architectural environment. The use of cooling tower often were the architects of the amendment. But the wind cold refrigerator shape founder, height normally does not exceed 3m, than the lower half of the cooling tower, does not seriously affect the appearance of the building. More sand in the North, on the outdoor condenser coil fin easy dust accumulation. For ease of cleaning, Italy RC company produces a small water pump within the air cooling machine, you can periodically flush fin.

Cooling tower noise and wind noise is generally cooler. Some air cooling machine noise is large, and some of the larger cooling tower noise, and manufacturers.

Italy RC company production of air cooled machine distance unit 1m far open space Office, condensing coil side of A sound level noise to 75dB. This is the low fan noise to the cooling tower.
Super high-rise building used air cooled chiller

When buildings to reach 200m above water cooled chiller application will be limited. One is a height restriction of pressure must not be too high; the second is the building facade, cooling tower building is beautiful. Typically, when we put cold water from a height of relay to another level, are high as a system 100m, refrigerator and system piping and valve pressure smaller than 1 .6mpa. Of course you can also go higher, but not the economy. 2nd 100m height adopts water gui ran locust around bang chip Atsumi arc 0? ~ 12 degrees centigrade cold water is converted into 8-14 ° c, for the 2nd 100m height cooling, the terminal device heat exchanger is higher than the first one of 100m height. If you convert a, refrigeration efficiency is low. The current international 200m above most adopts super high-rise buildings, air cooled chiller for cooling problems resolved.

For example, the Hong Kong Bank of China Tower (315m), 10 1200KW (340rt) refrigerator with air-cooled condenser, condenser fan is more leaves, horizontal or vertical air distributor in air condensing side or below. Air flow rate is 400 ~ 600m3/(h · KW). In addition to the engine sets a ventilation system, but are variable air volume of the exhaust system, a lookout cooler condensing heat from the engine room side of the pipe to outside shutters. Adopted 10 283m3/(h · KW) fan, combined with natural ventilation, the engine's waste heat effectively drained outdoors.

And if the current tallest building Asia-optimized Hong Kong Central Plaza (78 layer 368m), set three cooling machine room, each room has high 8m. 5 ~ 6, 44-45-69-71 layer to the device layer. Each level has multiple heat pump air cooling units, each with a capacity of 630KW (1800rt). 8m high equipment levels there is a layer of concrete plates, refrigerator in the following, air-cooled condenser placed in the upper part of the device layer. Air cooled condenser heat rely on axisFlow fan forced air flows into the device layer three plane shutters estuary. When a large outdoor wind speed, or you can use natural ventilation turn some condensation tropical. Singapore's super high-rise building in General also uses air cooled chiller.

Air cooled chillers use

At design time, as long as the requirements of the manufacturer to ensure that the exhaust and inlet air flow of good, is not a building block, the refrigeration effect have been able to meet the design requirements. Air cooled chillers mostly imported from the United States, France. Domestic air cooled chillers as long as performance meets the requirements can also be used. As urban construction on the building facades, cooling towers will gradually reduce the use of the air cooled chiller will increasingly high demands.