Companies that need to cool their raw materials, their processes or their final products, in the first place, do well to switch to a modern heating and cooling solution.New machines and technologies often work more energy efficiently and emit fewer greenhouse gases.The latter is also an important aspect, since according to the F-Gas regulation (517/2014), companies are obliged to reduce CO2 emissions related to the use of refrigerants in HVAC systems by 79% by 2030.Johnson Controls has already committed to achieving zero scope 1 and 2 emissions by 2040, ten years ahead of the Paris Climate Agreement target.The company aims to reduce its operational emissions by 55% and those of its customers by 16% by 2030. Its portfolio of solutions for heating and cooling is extensive: it includes, for example, the York YZ, a condensed chiller by water with an oil-free, magnetically levitated centrifugal compressor designed for ultra-efficient performance, running on R-1233zd(E), a non-flammable refrigerant with a low global warming potential (GWP) of 4.5.This can mean energy savings of up to 35% per year with lower running costs.At the same time, CO2 emissions are reduced.The York YZ is an example of how modern chillers can provide higher energy efficiency and therefore lower running costs by virtue of their technological design.Furthermore, greater energy savings can be achieved with water-cooled chillers if the principle of hydraulic free cooling is applied.YZ machines go one step further: in many cases, 'mechanical free cooling' is an even more efficient alternative.On the other hand, in the case of water-cooled chillers, the free cooling system is more complex.Depending on the design of the system, the free cooling principle requires a bypass of the installation to be able to take advantage of the condensation water directly for the cold demand of the building, an intermediate exchanger being necessary.In general, however, free cooling is recommended for any system designed for year-round operation.Because, whether it is a hospital, a shopping center, an industrial application, an office building, a laboratory or a data center, free cooling with cold outside air reduces the energy required to reach the necessary mechanical cooling capacity, which reduces energy costs in a climate-friendly way.At the same time, implementation costs are low.On some projects, chillers are only used for about 1,500 hours in summer, a time when temperatures in this country typically range from 20°C to 40°C.A water-cooled liquid chiller then takes over the cooling of air handling units (AHU), for example.During the transition period, outside temperatures drop between 16 °C and 0 °C and the AHUs no longer need additional cooling and will be able to work in thermal free cooling mode.Instead, the cooling load is now limited to the so-called base load and only includes loads inside the building.However, in conventional water-cooled chillers, a condensing water temperature of at least 18°C ​​is required for proper chiller operation.Therefore, to guarantee its operation throughout the year, a condensing water control valve must be installed, which maintains the minimum temperature of the condensing water during its operation (see diagram 1).When temperatures drop to negative degrees in winter, one option is to use conventional free cooling in switch mode to cover base load.In this case, the chiller can be completely switched off.Instead, the free cooling capacity is generated by an additional plate heat exchanger, and the recirculating chiller is used as free cooling.The plate heat exchanger must be designed for the lowest consumer temperature.In this changeover scenario, the number of chiller operating hours is reduced and the plant becomes more efficient overall.However, the part of pure free cooling is comparatively low, because the principle can only be started when the cooling water temperature is about 2-3K below the desired chilled water temperature.In addition, a plate heat exchanger, a pump and a three-way valve must be installed between the chilled water side and the cooling water side, which causes additional pressure losses on the pump side during the entire cycle. year, which in turn require energy (see diagram 2).Compressor speed is adjusted by the Variable Speed ​​Drive (VSD) to minimize lift (compressor differential pressure) and take advantage of lower cooling water temperatures in colder months, all with exceptional ratio performance. energy efficiency (EER).In return, plant operations run smoothly throughout its runtime.Whether in summer, in a transition period or in winter, its operation is optimized according to the outside temperature at all times.Depending on the outside temperature, the condensing water temperature drops successively up to a limit of about 4.4 °C, so that it can finally be below the cold water temperature (see diagram 3).To do this, the chiller is connected directly to the chiller and a 3-way valve is usually not required.The minimum inlet cooling water temperature is no longer limited to 16°C or 18°C ​​as in conventional water-cooled chillers, but can be reduced to 4.4°C.This much lower temperature results in an extremely low pressure level between the high and low pressure sides of the machine and the compressor can work less.Achievable EER efficiencies are up to 40°C and higher.Simulation software certified by the Air Conditioning, Heating and Refrigeration Institute (AHRI) accurately predicts chiller performance over the entire operating range.It has been validated with numerous AHRI and Eurovent certified tests and follows the same operating limits as the actual chiller.Thus, it provides the guarantee of capacity and efficiency at all points.This allows the entire HVAC system to be optimized for the lowest energy consumption, including air handlers, cooling towers and pumps.The associated hydraulic system has a simple and robust design, so there is no additional installation effort and therefore no additional pressure losses affecting the system throughout the year.Although the chiller is in continuous operation with mechanical free cooling, this is part of the energy saving concept.The comments are the opinion of the users and not that of the portal.Insulting, racist or contrary to current laws are not allowed.Comments that are not related to the news/article, or that do not comply with the Legal Notice and the Data Protection Policy, will not be published.Legal Warnings and Basic Information on Personal Data Protection: Responsible for the Processing of your Personal Data: Interempresas Media, SLU Purposes: Manage contact with you. 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