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Public pool in Góra Kalwaria, Poland

Location: Góra Kalwaria, Poland


Characteristics of building: Current Situation


The mission of the Sports and Recreation Center (pol. Ośrodek Sportu i Rekreacji w Górze Kalwarii) managed by the Municipality of Góra Kalwaria is to provide the residents of the municipality with sports, recreation and cultural space. Relevant building is a Public pool, located in Góra Kalwaria (urban area) in Masovian Voivodship. Exact address of the building is Pijarska 119 Street, 05-530 Góra Kalwaria (51°59'17.8"N 21°12'00.6"E)., Building is located in the center of the town of Góra Kalwaria, surrounded by single-family houses. The swimming pool facility with a total usable area of 4,052.60 m2 was built in 1999 (while drawing on mid-80’s project and technical design), by the municipal office and the owner did not change. Around 20 people work daily in the building with opening hours from 06:00 am to 9:45 pm.

The building (main materials) is constructed by concrete, glass, timber.  It has a compact form with a single-pitched roof above the hall with a swimming pool. Roof structure in the technology of beams made of glued timber.

The swimming pool is equipped with a sports and recreation area, which has numerous attractions such as a slide, a wild spring, a jacuzzi, etc. In addition, the building has a restaurant, gym and commercial space for rent. On the underground floor there is a ventilation room, a heating substation room and a sub-basin with technological facilities - a swimming pool water filtration system, pumping systems, heating installation, etc.

In the existing state, the external partitions of the building are as follows:

External walls/ basements: solid brick walls, partly reinforced concrete.

Above-ground: brick walls made of ceramic hollow bricks, 25 cm thick, insulated with 8 cm a layer of polystyrene finished with a pressure layer of checkered brick 12 cm thick.

Above-ground walls after thermal modernization: brick walls made of ceramic hollow bricks, 25 cm thick, insulated with a total of 14 cm layer of polystyrene.

Ceiling above the cellar made of reinforced concrete, 25 cm thick, insulated with an 8 cm layer of polystyrene.

Roof of the swimming pool hall: made of galvanized trapezoidal sheet fastened to wooden girders. It has been insulated with an 18 cm layer of mineral wool and is covered with thermally weldable roofing felt.

Remaining roof: reinforced concrete slab above some rooms; above the service part on lattice steel girders. The whole is insulated with an 18 cm layer of mineral wool.




Swimming pool for Demo 6

Characteristics of renovation need

The building requires renovation due to obsolete technological solutions and the wear of the existing building elements. With rising maintenance costs, the building consumes too much energy according to current standards. The biggest problems of the existing building are the ventilation devices and the glazed southern façade.

The current ventilation system serving part of the recreational swimming pool hall is not powerful enough for removing moisture gains, and therefore there are frequent exceedances of relative humidity above 80%. Such high humidity is dangerous for the structure of the swimming pool hall, its effects can be observed e.g., on girders.

Some of the windows of the swimming pool hall remain unprotected, i.e., no supply of fresh, warm air to their surface to protect it against condensation of moisture. The area around the slide tower is practically not protected against moisture accumulation in any way, there is no supply of fresh air in the right amount, here the relative humidity exceeds 90% at times. When analysing the operation of swimming pool air handling unit, it was noticed that currently the pressure loss on the heat recovery exchanger in the air supply duct is over 600 Pa at approx. 30% share of fresh air. This condition results from the incorrectly selected cross-section of the exchanger by-pass and the poor technical condition of the exchanger itself (dirty and corroded fins), which qualifies the air handling unit not for repair, but for reconstruction or replacement.

Currently, when operating in recirculation with a small share of outside air, the air supply fan capacity in the Air handling unit NW2 is about 8,000 m3/h. When trying to increase the share of external air in relation to the recirculating air, too high resistance of the exchanger and by-pass reduce the efficiency of the air supply system to about 5,000 m3/ h. air flow through the components of the air handling units enable full regulation. For both operating NW and NW2 systems, the change in the share of external air takes place in the range between 4,926 m3/h (when dehumidification is not needed and the AHU should operate in 100% recirculation) and 12,540 m3/h (when the AHU is required to operate with 100 % share of outside air - without recirculation).

The total efficiency of the supplied air NW1 and NW2 in the entire regulation range changes slightly in the range from 18,864 to 19,814 m3/h. In addition, there is air infiltration of approx. 1,900 m3 / h, which is confirmed by measurements of the supply and exhaust air efficiency.

Target Groups:

Type of user /occupant, internal users (e.g. inhabitants) / external users (e.g. visitors)


Monthly number of total tickets sold, approx. 110.000, incl.:  regular tickets – 41224; reduced tickets – 24408; pensioners – 3114; seniors - 2409; people with disabilities- 2637; people with a family card (Gora Kalwaria commune) – 2340; family tickets - 2577; holiday/holiday tickets – 1747; Swimming classes for infants – 1787; Number of people in Physical Education classes- 2709; Groups from outside the Gora Kalwaria commune – 4227; non-swimming sports clubs: 1741 users; Swimming clubs training regularly - 4298; School groups- 2470.

Maximum capacity of swimming pool users per hour is 212 users. Pool has most customers in the months: February, March, July, October; and least during: September, December.

Most customers (during weekdays) are on Tuesday, Thursday, Friday at 17-21 pm: approx. 170-180 people; and during whole days during the weekends; the least number of customers (on weekdays) between 6-8 am: approx. 30 people.

Besides the operator of the pool and its users, there are 22 stakeholders renting either usable space or advertising space in the building.

Situation characteristics


The swimming pool hall is served by two central units responsible for ventilation, heating and cooling.


N1 / W1 ventilation unit part of the sports swimming pool hall / circulating air volume: 15000 m3/h

The N2 / W2 ventilation complex, part of the recreational swimming pool hall: the amount of circulating air: 9800 m3/h.

The temperature of the air supplied in winter is 38°C.

The teams are tasked with maintaining constant parameters (temperature, humidity and negative pressure) in the swimming pool hall throughout the year, regardless of the weather conditions.

In the swimming pool hall, a constant temperature should be maintained two degrees lower than the air temperature, which according to the regulations should be in the range of 29-31 C.

Types and amount of energy used, place of energy use Annual costs (PLN):

Electricity: Lighting, mechanical ventilation, heating installation, cooling installation, office equipment, DHW); 768 [MWh/year].

Network heat (Central heating, Technological heat (ventilation): 1301 [MWh/year].

The four largest areas of heat consumption are Swimming Pool Water Installation (30%), Central Heating without N1W1 and N2W2 Air Handling Units (28%), N1W1 and N2W2 Air Handling Units (25%) and Domestic Hot Water (13%).

The heat source in the building is a district heating station located in the basement part of the building, supplied from the municipal district heating network. Central heating in the building is carried out in two ways: in the swimming pool hall, by air (air prepared in ventilation units) through diffusers located in the floor; in the rest of the building, water, pump, double-pipe heating with steel and panel radiators. Domestic hot water is prepared centrally in the heating substation and distributed to individual draw-off points. Swimming pool water is also heated from heat exchangers located in the heating substation.