Heatcraft Australia has expanded its range of energy efficient commercial chillers with the introduction of Lennox Aqua4 Polyvalent Air Cooled Chiller and Heat Pump.
Heatcraft HVAC business manager Mark Esdaile, said a market comparison has shown that the Lennox Aqua4 is on average 13 per cent more energy efficient than equivalent competitor models for cooling. It is also quieter than any other four pipe system in the Australian and New Zealand market.
The Lennox Aqua4 is a cost effective alternative to VRF systems that offers simultaneous or independent heating and cooling from the one system.
“It is especially suited to commercial buildings, hospitals, hotels and public buildings that require different zoning and load requirements,” Esdaile said.
“The simultaneous demand for heating and cooling during the year is increasingly common. Today’s commercial buildings often include areas dedicated to different functions and have high variable heat loads.”
The simultaneous and independent cooling and heating is achieved by the use of two independent refrigerant circuits connected by four hydraulic pipes.
These units are able to satisfy the demand for hot and cold water simultaneously through a system that does not require adjustment due to seasonal loading and is therefore a valid alternative to traditional air conditioning plants with chiller and boiler.
Esdaile said heating and cooling needs are constantly being balanced to maximise total efficiency of the unit to achieve desired temperatures across the entire circuit, regardless of demand.
High efficiency scroll compressors and high efficiency insulated braze plate heat exchangers contribute to the high EERs. The innovative fan blade design optimises airflow, while low noise versions can be specified which include a fully soundproofed technical casing and low speed on the condenser fan.
“Selecting an Aqua4 on your next project can also deliver capital cost savings to the property owner,” he said. “The need for separate heating and cooling solutions is eliminated, which not only reduces plant size, but also reduces installation time, refrigerant and insulation costs.”
The Aqua4 can operate in extreme ambient conditions (cooling ranging from -15°C to 45°C and heating from -10°C to 35°C), capacity ranges from 50 to 320 kW, with heating capacity from of 50 to 340 kW.
In addition to the Aqua 4, Heatcraft’s range includes the highly efficient Lennox Neosys and Ecolean Chillers. “We understand customers are after reliability and quality,” Esdaile said. “All Neosys and Ecolean Chillers are delivered from our European facilities that conduct extended qualification tests to ensure superior reliability.”
The Neosys chillers incorporate the latest multi-scroll Copeland compressors well-known for their solid reliability and high performance. Neosys also uses a specific and exclusive condenser fan motor design with hybrid ceramic bearings to extend the service life of the motors.
In a water system, the pump is one of the main energy consumption items. The energy costs of pumping can represent more than 20 per centof the total energy cost of a chiller. Lennox has addressed this with the eDrive variable speed pump technology, present in both Neosys and Ecolean.
At full load, eDrive automatically controls energy costs via an electronic adjustment of the pump curve. At partial load, eDrive automatically reduces the chiller pump speed. During shutdown periods, the chiller operates at minimum speed and on starting eDrive acts as a soft starter minimising start-up current.
“Customers no longer need to make the choice between a high efficiency version, a low noise or an ultra-low noise version. Neosys can adapt all situations with only one version,” Esdaile said.
The Active Acoustic Attenuation System uses an electronic control associated with variable speed fans. Neosys can automatically change the speed of all the fans – from zero to 100 per cent of the nominal air flow – to meet the building load requirements while being noise compliant.
For more information on any of the Chillers from the Lennox range, contact your Heatcraft representative on 13 23 50.