NEPTUS XP Compact water-air units Water loop The principle of the installation consists of a closed loop, If the temperature of the loop drops to below a value between where the water is circulated using a circulation pump. Via this 8ºC to 10ºC, the units that heat the loop (boilers, heat pumps, loop, water is supplied to each shop and provide the required etc.) will activate. If the temperature reaches above a limit temperature through energy exchange. value of between 20 to 30ºC, the cooling units in the loop This type of system is often found in shopping centres that (cooling towers, etc.) will activate. house a number of shops.It is particularly well adapted to It is also interesting to consider free cooling strategies that use buildings that require the simultaneous heating and cooling of drycoolers, for when the outside temperature is lower than that seperate zones. of the water loop when the predominant demand of the rooms Only units which meet requirements for heating, air conditioning is to be air-conditioned. or ventilation will operate and therefore consume energy. To maintain the temperature conditions of the water loop, units for heating (boilers, air-to-water heat pumps, etc.) or for cooling (drycoolers, cooling towers, water chillers, etc.) are generally used. In this way, the temperature of the water is maintained within the established limits that allow air-to-water units to operate with high energy efficiency and to minimise the overall energy consumption of the installation. The control of these systems adapts to create the optimum temperature conditions for the water loop. Air-to-water units that operate in cooling mode transfer the energy to the loop and those that operate in heating mode extract the energy from the loop. This means that at times the two effects compensate for each other and variations in temperature occur within the established limits, so that it is not necessary to operate the units that are responsible for maintaining the conditions of the loop. In this regard, the existing inertia of the water loop also plays an important role. Geothermal and hydrothermal energy Convinced that air conditioning using geothermal energy with COOLING MODE low enthalpy is an alternative to conventional sources, CIAT places strong emphasis on this system. The Neptus XP units integrate simply into all types of installations. Electrical This option consists of drawing on natural energy (rivers, wells, consumption etc.) using low temperature sensors or groundwater pumps: Heat extracted Heat from the ■ Open-circuit (rivers, wells, etc.). dissipated building ■ Horizontal geothermal exchangers with closed circuits. into the ground ■ Geothermal exchangers with vertical drilling and closed circuits. Water-to-air units can be connected to systems that use water as a heat-transfer medium. This allows for significant savings as there is no need for additional auxiliary units (boilers, drycoolers, heat HEATING MODE pumps, etc.). In addition, the stable, controlled temperature of the external energy source allows units to operate with high levels of seasonal efficiency. In heating mode the energy is drawn from a thermal source. In Electrical cooling mode a cold source is used. consumption Heat is brought to the building Heat extracted from the ground 308 308 CATALOGUE 2021