Ventilation basin: the scheme and subtlety of design.

Why ventilation in the pool?In order to maintain proper climate, particularly humidity and temperature, any pool must be equipped with reliable and well-designed system ventilation.Ventilation pool is especially important for large projects, pools at medical and health institutions, and so on. Do not forget about ventilation and the design of the small swimming facilities in private homes.The ventilation system should be carried out pool with a strict implementation of hygiene standards.


Accounting normalized parameters of air environment

criterion for proper design of the ventilation system of the basin is compliance with the external environment in which any visitor to the pool would feel comfortable enough.You also need to pay due attention to parameters such as humidity and temperature in the room by the pool.Ventilation pool - is an essential element to be taken into account at the design stage of construction.

main parameters of these are:

- acceptable level of humidity, which should n

ot exceed 65%;
- matching the water temperature ambient temperature: this difference may be no more than 2 degrees;
- the optimum water temperature in the pool, there are various opinions on this subject, but in general it should be within 30-320S (for swimming pools, where the water is heated);
- taking into account the comfort of staying out of the water swimmers set a maximum speed of indoor air swimming pool - not more than 0.2 m / s.By
installation of ventilation systems, should take into account such an important criterion as the value of the calculated air - it must be at least 80 m3 / h for each visitor.Bandwidth, ie the estimated number of visitors to the pool, to be considered at the beginning of the project development.Thus, at the design stage ventilation basin must accurately establish the maximum capacity of the pool.As known
decisive importance is given also to the difference in volumes of air supplied to the room and to be removed therefrom.Otherwise, visitors can constantly assailed by a sense of closeness (with excess supply air) or a draft (with an excess of exhaust air).Both are unacceptable especially in the pools at the medical and health organizations.Permissible difference should not exceed 50% of the total air.


addition to purely hygienic indicators of great importance in the development of the HVAC system has ergonomics and, in particular noise.Ventilation equipment should be installed and in such places, the level of noise they produced was minimal (and without prejudice with respect to the design capacity of the fan).The noise level in the room must not be higher than 60 dB.Conditioning and ventilation systems must strictly comply with all sanitary norms and rules.These rules are clearly defined by the legislation of the Russian Federation and registered in the corresponding SNIP and GOST and other normative documents.


Development features of the ventilation system pool

Since we are talking about the room, where ever there is a significant number of people, then forced-air ventilation must be completely ruled out the formation at its operation of any hazards - and for the peopleand devices for swimming pools.In the latter case, it refers to condensation of moisture vapor, which in the presence of a large body of water (and at slightly elevated against the normal values ​​of the water temperature) results in a gradual accumulation of moisture on the surfaces of ventilation shafts.Taking into account the material of these surfaces in such cases is expected to premature failure of the ducts due to corrosion.Furthermore, rust particles getting into the zone of the fans (especially vulnerable to forced ventilation) may cause jamming of their working surfaces and production equipment accident.
way out of this situation is to ensure effective protection of the working surfaces of ventilation shafts without compromising their health.

insulation system

Isolation can be done in two ways:

- the creation of corrosion protective shields made of durable plastic;
- using the intake valves to the presence of electric heating, which would be worked out quickly changing temperature and humidity conditions in ventilated areas.
- using traps.


Construction of the pool in a private home


As for public pools, ventilation private swimming pool designed with a view of all the above circumstances, but the power of the ventilating equipment, based on the smaller area of ​​the pool, as well as a limited number of visitors, maybe lower.In particular, it is necessary to take into account the fact that the pool is valid for individual use as needed.Therefore, the required equipment may have lower performance.However, the design process can provide for the installation of additional systems supply and exhaust systems, which will be included in the basic equipment to help with the full use of the pool.This eliminates overruns electricity, but provides the optimal value of air in it.Thus the organization of the system of ventilation and the requirements relating to the safety of its use, must be maintained at the same level as for the ventilation equipment of public swimming pools.


indicators to be considered when calculating the ventilation basin

1. Area.
2. Estimated multiplicity of air exchange for ventilation basin.
3. The characteristic values ​​of the air per visitor.
4. Valid values ​​for the room temperature.

This developed for these conditions, the system of ventilation is to solve the problem with the greatest possible compactness of its member units.For this purpose, selected for optimum dimensions and performance heater, fans and filters operating system.Designed monobloc system these units largely meet the requirements.Moreover, the choice of the ventilation system can provide the recovery of excess heat from the fans, in order to partially reduce the cost of heating the room pool.This is achieved with energy savings up to 25%.However, with sufficient justification climate zone building a swimming pool, as well as its volume and it is advisable to install additional sources of heat, such as water heating.If the purpose of such heating water withdrawal is expected from the general system of its submission to the pool, then the design is required to provide for additional water filters because the water for use in the pool, and technical water heating have sharply different requirements for quality and regulated by different guests.Usually pools for personal use rarely have in the main building - often in a special annexe or in a separate enclosure.Accordingly, ventilation and pool in this case must be designed independently of the main ventilation system of the building.In order to decrease water capacity indoor pool that entails damage of ventilation shafts, water table is usually closed.This reduces the evaporation of water is reduced overall moisture, virtually eliminated the need for additional pumping of water in the pool basin.

principles for determining the estimated performance


can be based on the parameters set out above, but the pool of private use permitted some changes.In particular, the lower limit of the relative humidity of the air in some cases can be reduced up to 50%.This is due to the fact that the number of visitors of the pool is relatively small and uncomfortable humidity from reduced performance will not be as noticeable.At the same time it reduces the risk of condensation on the walls of the building by the pool.
system design ventilation begin to clarify the actual air flow.There are experimental table, which specifies the temperature in the room and pool area of ​​his cup.Depending on these parameters based on the data table you can easily set the desired value of hourly air.Further, in the same way you can define the needs and capacity of ventilation systems.For example, in the area of ​​the pool of 32 m2 and the estimated temperature of 340C required air flow rate shall be 1 100 m3 / h.The corresponding electrical power - 20 kW.

calculation of ventilation parameters pool

make a preliminary calculation of the ventilation basin in accordance with the technical requirements, it is necessary to take into account the following parameters:

- a mirror of the working area of ​​the basin;
- the surface area of ​​the track surrounding the swimming pool;
- the total area of ​​the basin;
- outdoor air temperature in the area of ​​construction of the pool (separately for the coldest and most warm pyatidnevok years);
- minimum temperature of the water in the pool;
- minimum air temperature;
- the estimated number of visitors to the pool;
- calculated temperature of air removed from the room pool (needed to determine the danger kondensatoobrazovaniya).


account of the indicators

- Heat transfer in the pool room at the expense of solar heat in the summer, by visitors who are actively using the pool, from the heated pool of water on its surface evaporation, and a number of other factors.
- Heat transfer due to temperature difference between the water in the pool (with the number of swimmers average water temperature increases).
Calculated data pool for ventilation should be compared with normative values ​​of air.Based on the calculation of the draft ventilation is sometimes adjusted.It takes into account possible fluctuations in the original data, due to differences in ambient temperatures in the warm and cold seasons.Accordingly, it is determined by the total capacity of ventilation systems for two variants of operation of the pool.If necessary, the design decision lays reserve space for the installation of additional ventilation systems.Be sure to take into account the additional space, which can be placed additional ventilation is to ensure the uninterrupted flow of fresh air into the room by the pool.Also taken into account and a backup area, which can be placed additional ventilation to ensure outflow of "waste" of air.

Ventilation

Firstly, allowed for a reduction in the allowable humidity.Second, it takes into account the actual value of the air flow.This is often used experimental data indicators calculated for similar facilities.
projected ventilation basin requires computing.


weighted volume of incoming air

W = exFxPb-PL, kg / h.
In this formula:
F - the calculated surface area of ​​the water in the pool, m2;
Pb - design pressure by evaporation of moisture (for conditions of high humidity and at a certain temperature of the pool water), Bar;
PL - vapor pressure at standard temperature and humidity, Bar.
Since this dependence is used for calculation in Germany, where the unit of 1 bar of pressure is used, the practical application of the formula it is worth recalling that 1 bar = 98.1 kPa.
E - intensity factor during evaporation, kg (m2 * h * bar), which depends on the specific structure and rules of operation of the pool.For swimming pools, a water surface of which is covered with foil, the figure is 0.5, and for the open surface - 5.
dramatically increases the value of this indicator as the number of visitors:
- with a small number of them - 15;
- with an average number - 20.
- with a significant amount - 28;
- optional with water attractions - 35.


Airflow of its mass

mL = GWXB-XN, kg / h,
and air consumption of its volume - depending on.
L = GWrxXB-XN, kg / h.
here:
L - volume flow, m3 / h.
mL - mass flow rate, kg / h.
GW - total volume of evaporating moisture indoor pool, g / hr.
XN - plenty of moisture from outside the basin, g / kg.
XB - the mass of water within the basin, g / kg.
r - density of air in the room to a predetermined temperature, kg / m3.
It should be noted that the index in the pool water content varies depending on the season.In winter it is about 2-3 g / kg, and in the summer - 11-12 g / kg.Usually taken to calculate the average data at 8-9 g / kg.

Works on installation and assembly

Installation of ventilation is done with careful sealing of pipes and protect against heat loss in them.Categorically unacceptable to direct the flow of air to the water surface of the pool.If the ventilation system has a small dimensions, its advisable to be installed in the space of overlapping mezhdupotolochnom pool.For reasons of possible closures and subsequent fire Do not install the system built-in air conditioners.Thus, the installation of ventilation systems is not so difficult process, as it may seem initially.