VRV water cooled condenser.

How not to catch a cold from the air conditioner.
November 21, 2017
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VRV water cooled condenser.

The company Tadiran Power many years continues to be one of the leaders in the development of
Central multi-zone systems. During this time the company has developed many different systems a VRV system with different functional capabilities. There are systems that operate only in the cooling mode;
systems operating either in cooling mode or in heating mode; system running at the same time as in the cooling mode and heating. Has VRV system designed for hot regions the outdoor temperature up to +56°C and cold regions, allowing efficient use of the heating mode when outdoor temperatures down to -25°C. There is a VRV system that not only cooling and heating air, but also to provide consumers with hot water. This article focuses on types of VRV systems – “VRV water cooled condenser”.

In a water system VRV uses the same internal blocks as in the standard VRV, all the differences are concentrated in the outer block.

Compared with the outdoor unit of a standard VRV air cooled outdoor unit water VRV is much more compact, because it has no fan and the bulky condenser cooling is replaced by a compact plate heat exchange “freon-water”. While circulating through heat exchange, water removes heat in the cooling mode or brings warmth in the heating mode. Obviously, the water circuit must have a means of maintaining the temperature in the specified the range – for example, dry coolers and boilers.

The concept described has several significant advantages. First, the outdoor unit is very compact and does not require a large consumption of cooling air, so it is easy to find a place in any shopping the room. Since the outdoor unit in this location is on one floor and close to the indoor units, no problem with restrictions on the height differences and the length of freon lines, significantly reduces the amount of refrigerant in the system.

Second, for discharging the heat from circulating water, diverting the heat from outdoor units, can use coolers with low noise level and set at arbitrarily large distance from the outer blocks.

Thirdly, water VRV can realize a double recovery of heat. This is useful if the building there are both areas that require cooling, and zones that require heating.

Fourth, the operation of water systems can be a year-round, with the possibility of using cooling and heating individually in each room.

Fifth, water VRV combine the advantages such as chiller systems and VRV systems, but provide large energy efficiency and comfort than a chiller system.

Energy efficiency VRV water is provided in various ways. Water VRV-system Tadiran Powerallow double recovery of heat. If in the same room is cooled air, and in another room is included in the heating mode, the heat removed in the refrigerated room, is used to heat the air in the heated room. Such recovery is carried out in the system VRV and air, and with a water condenser. In addition to this can be used another kind recovery. If the building has multiple “water” VRV and they all use a single loop circulating water for the condensers, the process operation may occur the transfer of heat from one outdoor unit to another. This reduces the energy consumption of the boiler. Thus, you can talk about dual heat recovery. With the right distribution systems for zones with due consideration the purpose of the building and, consequently, the distribution of loads, the energy savings will be significant.

Today, the company offers the third generation of water-cooled VRV, based on technologies and units the VRV IV system, including VRT – variable boiling point of the refrigerant the possibility of connecting various types of internal blocks, and configuring the system using computer. In addition, the VRV IV-W has a number of technologies, peculiar only to water-cooled systems, for example the ability to control the water flow through the condenser and work in conventional or geothermal mode.

Managing water flow through the condenser is an important and useful feature for systems of this type.
Unlike traditional systems with air condenser water-cooled systems require installation a certain amount of additional equipment, primarily in circulating pumps for water circuit. Circulation pumps consume electricity, which adversely affects the General the energy efficiency of the system. Regulating the flow of water is a good way to optimize this component energy consumption.

How does it work? The outdoor unit can control a valve installed on the water contour using the 0-10V signal, depending on the performance of the compressor. Performance the compressor, in turn, depends on the load on the system. Using the circulation pump with frequency converter in combination with a differential pressure sensor, it is possible to obtain a variable water flow in circuit. It will vary depending on the performance of the compressor.

How does it work? The outdoor unit can control a valve installed on the water contour using the 0-10V signal, depending on the performance of the compressor. Performance the compressor, in turn, depends on the load on the system. Using the circulation pump with frequency converter in combination with a differential pressure sensor, it is possible to obtain a variable water flow in circuit. It will vary depending on the performance of the compressor.

The ability to work in the geothermal regime in practice means the extension of the range of valid water temperature in the water circuit with special settings. While the lower limit mode heating is shifted to -10°C. Thus, the range of condensing units is unified, and, if you are considering a geothermal system application, no special versions of equipment or additional accessories required.

Thanks to the geothermal regime it is possible to refuse additional equipment to maintain water temperature in the water circuit of the system within an acceptable range, however, the geothermal system is costly and not always possible, so it is much more often used other options. They can be reduced to two model schemes.

The first scheme: using a cooling tower to cool water in the summer, the boiler for heating water in the winter. This is the cheapest option from the point of view of initial cost, but the least energy efficient. It can be useful, if the choice of water-cooled systems are justified solely layout considerations example: there is no possibility to use air cooling due to restrictions on lengths of slopes, or elevations.

The second scheme is the use of a chiller with a heat pump for cooling and heating water in the water
the contour of the VRV systems. This is a good option if the object in either case, the chiller, ensuring
efficiency of VRV systems can be one of its tasks. An example of such object may be located wherein the chiller provides the air treatment in ventilation and conditioning large public areas and split air conditioning system creates a comfortable environment in rooms. If space permits, the chiller can be supplemented with a cooling tower, which will support the water temperature in the cooling mode at light loads, and chiller will only be used in if the performance of the cooling tower is not enough.

These schemes can be combined together equipped with water-cooled VRV systems Tadiran Power.

 

 

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