PRODUCT SNAPSHOT
High comfort, low cost 4Z chillers from DAPUK Daikin Applied has launched the ‘4Z’ Multifunctional series which claims
to have the highest comfort and lowest running costs for all year round climate control.
T
he new 4Z Multifunctional chiller series has capacity ranges from 400kW up to 1415kW, equipped with Daikin single screw compressor, inverter driven and variable volume ratio technology. The series is designed to meet the building’s demands in the most effi cient and sustainable manner. Recently the need for a higher level of comfort has signifi cantly increased, particularly in those applications where cooling and heating are to be provided to diff erent areas of the building.
A Multifunctional unit, also known as ‘4- pipe’ is the perfect answer to meet this need, thanks to its fi ve diff erent operating modes: ■ Cooling only ■ Heating only ■ Cooling and heating perfectly balanced ■ Cooling demand higher than heating ■ Heating demand higher than cooling.
Multifunctional units can be considered as an effi cient alternative to traditional solutions where, for example, chillers are used to satisfy the cooling load and boilers are covering the heating load. If compared to a traditional heat pump system, multifunctional units are also capable of satisfying contemporary cooling and heating demand without any restriction. Not only do Multifunctional units allow
signifi cant cost savings on installations, with one single product satisfying cooling and heating demand, they are also a very effi cient solution thanks to their capability of energy recovery. In buildings where a contemporary cooling and heating solution is required, the Daikin Applied 4Z system works in heat recovery mode, avoiding the typical energy waste of traditional equipment. When working in total heat recovery mode (cooling and heating load balanced), the unit simply ‘transfers’ the heat from the cooling loop to the heating loop in the most effi cient way. That specifi c operating mode, combined with Daikin’s leading technology, allows the new Daikin Applied 4Z series to achieve the highest
70 January 2018
effi ciency level in the market. The effi ciency in total heat recovery mode (TER, Total Energy Ratio) reaches 8.7.
One of the main reasons behind such high
effi ciency levels of the Daikin Applied 4Z series is the advanced design of one of the most important components of the unit: the compressor. That compressor is fi tted with Daikin’s design inverter that is cooled by liquid refrigerant. The inverter drive is integrated within the compressor casing, allowing simplifi ed unit design and reduced unit footprint.
The refrigerant cooled inverter allows the installation of the unit in even the most extreme environments, such as high ambient or industrial sites where traditional air cooled inverters may not be the ideal solution.
The inverter drive modulates compressor capacity at part load in the most effi cient way. This means the energy consumption at part load is drastically reduced compared to fi xed speed compressors. This is extremely important if one considers that the unit will run at part loads for most of the time during the year. The Daikin compressor has Variable Volume Ratio technology (VVR). A specifi cally designed slide vale adjusts the geometry of the discharge port, so that the refrigerant discharge pressure can match with the condensing pressure. In this way, the typical energy losses of traditional compressors are avoided, thanks to the fact that the refrigerant is compressed at exactly at the required pressure level.
VVR technology is the best possible solution for Multifunctional units that are required to operate during the year at various conditions of temperature, cooling and heating load demand.
In additional to the highest effi ciency levels, the Daikin Applied 4Z series has numerous features that diff erentiate this product from others. First of all, it off ers the largest capacity on the market for a Multifunctional unit: up to 1.411 kW in cooling and up to 1.415 kW in heating at nominal conditions. Thanks to the possibility of the inverter modulating compressors’ rotational frequency, the Daikin Applied 4Z can satisfy any unforeseen cooling or heating peak loads, with the ‘boost’ mode allowing up to 15% extra cooling or heating capacity. In this way, the unit can be selected without the need for oversizing in order to match the peak load requirements that may be experienced for just a few days during the year. The Daikin Applied 4Z is available in three
diff erent sound confi gurations that can satisfy various installation requirements. The super quiet version can go down to 66 dB(A) sound pressure level at one meter distance. Thanks to the capacity modulation with inverter, depending on unit model and rating conditions, sound levels are further reduced by up to 10 dB(A) at partial loads. Also, the operating envelope is the widest on the market. Hot water production goes up to 61°C and chilled water can go down to -10°C in case of process cooling applications.
The new 4Z series is compatible with the latest Daikin Applied control and monitoring platforms. The Daikin on Site cloud-based platform allows a number of advanced functionalities, including remote monitoring, system optimisation and preventive maintenance.
More than that, the Multifunctional series comes with Master/Slave functionality as standard, allowing up to four units to be connected on the same system without the need for external control devices.
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