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Air-Air system

with VRF Indoor Units

Product overview

Heat pumps are the ideal solution for air conditioning a building. Heat pump systems that work according to the VRF technical principle are particularly suitable for large office buildings, hotels and other commercial buildings. The abbreviation VRF comes from “Variable Refrigerant Flow”. VRF systems with gas engine heat pumps from YANMAR offer two important advantages: On the one hand, they allow individual building areas or rooms to be heated or cooled to different degrees – even simultaneous heating and cooling is possible if, for example, individual sides of the building receive a lot of sunlight in the spring, while others lie in the shade. On the other hand, they represent an extremely economical solution in buildings with many rooms or residential units.

Heat pumps transport heat and at the same time raise it to a higher energy level. To do this, they cause a refrigerant to evaporate at low pressure, with heat being absorbed. Heating is about abundant ambient heat, while cooling is about excess heat from the building. They then cause the refrigerant to condense again at high pressure, with the absorbed heat being released again at a technically advantageous temperature level. Often the cycle of evaporation and liquefaction only takes place in the heat pump itself, while the further heat transport takes place via a water circuit or a ventilation system. As a further development of multisplit technology, VRF systems, on the other hand, are more decentralized. The refrigerant flows directly to wall, floor standing, ceiling or ceiling suspended, duct devices and air curtains in the building. Only in these indoor units – up to 48 pieces per YANMAR gas engine heat pump – is it liquefied or evaporated again, in order to finally flow back to the heat pump.

The distinguishing feature of VRF systems is that the strength of the refrigerant flow is always matched to the current demand of the indoor units. So only as much energy flows through the air conditioning system at all times as is necessary to keep the temperature in each area of ​​the building at the desired value. The continuously adjustable compressor or drive of the heat pump can therefore always work with the most efficient output at VRF. And gas-powered heat pumps are used in a VRF system, e.g. modern gas engine heat pumps from YANMAR increase efficiency and profitability significantly. Thanks to the engine heat – which can be used for heating or water heating anyway – the defrosting phases required for electrical systems on cold days are no longer necessary. Instead, a VRF system with gas engine heat pumps can be started up effortlessly, even at outside temperatures of minus 20 degrees Celsius, and can develop its full heating capacity right from the start.

The VRF principle also offers important advantages. Compared to other systems, for example, the space required for the installation is small, mainly due to the thin copper pipes for the refrigerant. VRF air conditioning systems are therefore also ideally suited for the air conditioning modernization of existing buildings. System planning is also easy with VRF systems. And finally, VRF systems designed as 3-pipe systems offer maximum comfort in all weathers. In these systems, a hot gas line is added to the line for liquid refrigerant and the suction line for gaseous refrigerant. Warm, gaseous refrigerant flows in this line from the heat pump to the indoor units. Such a VRF heat pump system not only enables the energy-efficient heating or cooling of the entire building. Rather, each indoor unit can give off or dissipate heat at any time. Precise temperature control is therefore possible even under demanding conditions without any additional heat or cold generator.

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