Under the Sign of LEED Platinum

The company Carrier always works on creation of ecologically effective technologies for cooling and air-conditioning systems. The Evergreen chillers offer efficient and enduring equipment operating on the base of ecologically safe chlorine-free cooling agents which aren’t subject to phasing out. A Carrier’s choice is in favour of a cooling agent HFC-134a which doesn’t influence on the ozone layer and it is possible to use ecologically efficient equipment not reducing high indices of cooling power.

Chiller Carrier 23XRV
We already reviewed the high-performance chiller Carrier 23XRV in short (“TB”, No 3, 2011). In this article we would like to examine this watercooled refrigerating machine on the base of a screw compressor in detail. All chillers of this series are equipped by variable-frequency electric drives factory tested in refrigerating machines. The variable-frequency electric drive provides a soft start and low starting current. It doesn’t require an additional place in a refrigerating center room, as the starting current is installed in a frame of the chiller.

It is worthwhile to mention that it is easily to connect electricity network as the chiller has just one point of power line entry. The chiller construction is developed for operation in cooling agent circuits with positive pressure. Therefore it doesn’t require installing additional equipment necessary for chillers operating under negative pressure. In the event that the chiller becomes depressurized, air or moisture doesn’t penetrate into the cooling agent circuit.

The chiller 23XRV has the lowest indices of freon leak in the industry – 0.1% per year. Other advantage of the chiller is that a stop valve optionally installed permits to fill it by freon in factory and reduce time of balancing and commissioning, maintenance services. In addition, by a customer’s desire, the chiller can be equipped by a freon extraction system. These chillers have a certificate for installation in buildings situated in seismic zones.

The chiller 23XRV is indispensable for operation with part loads. As is known, chillers being a part of airconditioning systems in commerce objects (ТРК, office complexes, hospitals, hotels) work less than 5% of total time. Therefore producers of refrigerating machines developing chillers try to achieve high indices of energy efficiency exactly during work with partial loads. An installation of high efficient chiller is necessary for a LEED certification of buildings, but it is inefficient condition for improving energy efficient characteristics.

The LEED doesn’t take into account a value of integral index of chiller energy efficiency (IPLV), and so you will not obtain additional balls in the section “Energy and atmosphere” just installing a required equipment. First of all a development of information model of the building is required and chiller is just one of components from the energy saving cooling or air-conditioning system. The chiller 23XRV has an award from the exhibition ASHRAE Expo-2008 in the nomination GREEN BUILDIN’S PRODUCT.

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Text by MICHAEL TEREHOV, Ph. D. in Engineering, member of ASHRAE, leading technical expert in AHI Carrier Fzc