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The basis for the design of a swimming pool ventilation and air-handling system is VDI 2089. It takes into account the boundary conditions relevant to swimming pool climate control and, among other things, forms the basis for determining the expected evaporation and thus the moisture load to be removed.

Therefore, it is not only the water surface area that is decisive, but also, among other factors, the pool type and usage, the water and room air temperatures, and the resulting evaporation rate. A heavily used recreational or therapeutic pool, even with the same water surface area, places different demands on dehumidification than a quiet private pool.

The water surface areas and dehumidification capacities listed in our tables were determined in accordance with VDI 2089 under the respective boundary conditions specified and are provided for guidance. The specific Pool Line design is then carried out based on the actual project and operating conditions. See also our Swimming Pool Climate Wiki

Pool Line GS is not bound by a rigid grid of fixed unit sizes. Dimensions, airflow, sectioning, and components are designed on a project-by-project basis according to the required airflow capacity, the HVAC application, and the structural constraints.

This is particularly advantageous for retrofits, limited space for mechanical equipment, or difficult installation routes. Units can be divided into suitable sections based on the installation situation and assembled on site.

Not every square meter of water surface results in the same rate of evaporation. Usage, water movement, and pool type significantly influence water transfer and, consequently, the moisture load. VDI 2089 takes this into account in its calculations by using different water transfer coefficients; in the case of water attractions, additional evaporation flows may be involved.

Therefore, the same Pool Line unit can cover a significantly larger water surface area in a quiet private pool than, for example, in a heavily used recreational, wave, or therapeutic pool. The water surface areas in our tables are therefore intended as a guide for typical applications—the specific design based on actual usage and operating conditions remains decisive.

Pool Line can be optionally equipped with an integrated, freely adjustable heat pump. It enables additional heat recovery and—depending on the system and operating concept—can help further reduce the energy requirements for swimming pool climate control.

Depending on the Pool Line configuration, excess heat can also be utilized for water heating via a fresh water or pool water condenser.

High temperatures, high humidity, and the typical pool environment place special demands on the materials and components of an HVAC system. That is why corrosion protection is an integral part of the Pool Line system design—not merely an optional add-on.

Depending on the component, suitable materials and finishes are used—for example, coated housing panels up to C5-H, anodized aluminum profiles, protected fans, epoxy-coated coil fins, and powder-coated internal components.

Pool Line already features a demand-based HANSA control system. With etaSmart, this can be expanded to include model-based, predictive operational optimization.

This approach does not rely solely on current measurement values. etaSmart takes into account the behavior of the building and the system, as well as relevant influencing factors, to plan future system operation in advance and optimize energy efficiency.

The amount of savings achieved with etaSmart depends on the system, the building, its use, and previous control behavior. For this reason, it is not possible to specify a standard savings figure for every swimming pool. However, the real-world examples evaluated so far demonstrate significant potential.

At the Ramsloh swimming pool, comparative operation was analyzed over a total of 16 months. On average, etaSmart reduced electricity consumption by 24% and heat consumption by 29%. This resulted in approximately 25% lower energy costs, or savings of about 10,000 euros based on the energy prices used in the analysis.

At the Barßel swimming pool, energy costs for operating the equipment were reduced by 20%. Further studies also show that etaSmart does not necessarily reduce every single type of energy: In Bad Zwischenahn, for example, heat demand increased, while electricity consumption fell disproportionately. Overall, costs there were reduced by 31%. At the same time, higher pool temperatures led to lower evaporation losses of the pool water.

What is crucial, therefore, is not the isolated minimization of electricity or heat consumption, but rather the energy-efficient and cost-effective optimization of the entire system while maintaining the required indoor air conditions.

View case studies and savings potential with etaSmart

The process begins with the specific HVAC task and the basic data for the swimming pool. This includes, in particular, water surface areas and pool types, usage, water and room air temperatures, operating hours, as well as structural and technical constraints.

Based on the planning data and the requirements of VDI 2089, the required dehumidification and air handling capacity, as well as the system design, are determined. The guideline provides design values and practical guidance for the mechanical systems of indoor swimming pools.

HANSA uses this basic data to design the equipment. The concept is further refined through several coordination steps with the designer and/or operator: the product series or unit configuration, heat recovery, optional heat pump, dimensions, airflow, control system, and other features are tailored to the specific project.

Once the order is placed, the Pool Line unit is manufactured and delivered according to this configuration. Integration into the overall system is carried out in collaboration with the system integrator. HANSA can then handle the commissioning and calibration of the unit and control functions.