Dining room ventilation

Explanatory Note

Introduction

The heating section of this project is made taking into account the following requirements:

1. SNiP 2.04.0591 * "Heating, ventilation and air conditioning";

2. SNiP 230199 "Construction climatology";

3. SNiP 2.08.0289 * "Public buildings and structures";

4. Reference Manual for SNiP 2.08.0289 * "Design of catering facilities";

5. SP 2.3.6.107901 "Sanitary and epidemiological requirements for public catering organizations, the manufacture and turnover of food products and food raw materials in them";

6. SanPiN 2.2.4.54896 "Hygienic requirements for microclimate of production premises."

Source Data

Object characteristic

Dining room reconstruction project ------------- OJSC "-----" for 30 seats located at the address: St. Petersburg, Ave. -------, d.39.

Basis of design:

• technical assignment for design;

• set of architectural and construction drawings;

• technological solutions.

2.3. Outdoor air parameters (Table 1)

2.4. Internal air parameters

2.5 Permissible microclimate parameters at workplaces of production premises

Basic Ventilation and Air Conditioning Solutions

Calculation of air exchanges

Air exchanges were calculated for the premises in accordance with the requirements of the regulatory literature. For the production rooms of the cafe, the design air exchange is determined based on the condition of assimilation of heat residues and taking into account the work of local suckers in the hot shop with sections, in the remaining rooms by multiplicities. The calculation results are summarized in Table 4.

Hot shop with areas

Initial data for calculation (warm period):

Installed heat-generating equipment:

- 4-comfort electric stove with EP4ZHSH frying cabinet, power N = 16.6 kW (1 pc.);

- steam convectomate for 6GN1/1, injection FC06E, power N = 8 kW (1 pc.).

Equipment simultaneous operation factor kod = 0.8.

Load factor of electric plates kzagr = 0.65.

Load factor of other equipment (steam convectomate) kzagr = 0.3.

Kef umbrella efficiency factor = 0.25.

We determine the amount of air required to assimilate the heat entering the room.

The amount of heat supplied to the room is calculated by the formula:

Q = Ql + Qsv + Qobor + Qrad, W,

Where: Ql = q x in = 150 x 3 = 450 W is the amount of heat generated by working people (q = 150 W is the heat generated by one person, in = 3 is the number of working people);

Qos = 25 x 25.9 x 0.6 = 389 W - amount of heat generated by lighting devices (25 W/m2 - specific amount of heat generated by incandescent lamps per 1 sq.m. of illuminated area, 25.9 - area of the hot shop, 0.6 - proportion of heat supplied directly to the working area);

Qobor = A (kod x kazagr x kef x N) x 1000 = (0.8 x 0.65 x 0.25 x 16.6 x 1 + 0.8 x 0.3 x 0.25 x 8.0 x 1) x 1000 = 2 638 W - amount of heat generated from operating equipment.

Qrad = (qp + qp) x Fast x kost x kzagr + [(tn - tv )/Rost] x Fast - amount of heat supplied due to solar radiation, W,

Where: qp. = 501 W/m2 and qp. = 98 W/m2 is the amount of direct and scattered solar heat supplied per 1 sq.m. of vertical surface (60 ° S, south-west);

Fost = 1.63 x 1.8 = 2.934 m2 - glazing area;

kost = 0.9 - coefficient taking into account contamination of glazing;

kazagr = 0.51 - coefficient taking into account shading of glazing (presence of bindings, blinds, eaves, etc.);

tn = 20.5 ° С - design outside air temperature;

tv = 18ºС - the design temperature of internal air.

T.O. Qrad = (501 + 98) x 2.934 x 0.9 x 0.51 + [(20.5 - 18 )/0.42] x 2.934 = 825 W.

The total heat input to the room will be:

Q = 450 + 375 + 2 638 + 855 = 4,288 W.

We determine the supply air flow rate for assimilation of heat:

Lp.1 = 3.6 x Q/[ a x (Iyx. - Ir.)] = 3.6 x 4 288/[ 1.21x (64-51.6)] = 1 030 m3/h,

Where: Q = 4,288 W - total heat inputs into the room;

ρ = 353 / (273 + 18) = 1.21 kg/m3 - air density;

Iyx. = 64 kJ/kg - heat content of the outgoing air at tuch = tpr + gradt (Hhpz) = 24.8 + 2 x (3.5-2) = 27.8 ° C, vol. Figure I-d;

Ipr. = 51.6 kJ/kg - heat content of supply air at tpr = 20.5 ° С.

We determine the amount of air removed by local suction:

A single umbrella above the electric plate and steam convectomate plan 1340 x 820 mm, confinement area 4 x 0.417 x 0.295 = 0.492 m2, surface temperature 400 ° С.

Amount of removed air is determined by formula:

Vegetable workshop

Ventilation air flow rate determined by multiplicity:

- inflow Lpr. = 3 x 16.1 = 50 m3/h;

- exhaust Lw. = 4 x 16.1 = 65 m3/h.

Meat and Fish Shop

Ventilation air flow rate determined by multiplicity:

- inflow Lpr. = 3 x 15.3 = 46 m3/h;

- exhaust Lw. = 4 x 15.3 = 61 m3/h.

Tableware wash

Ventilation air flow rate determined by multiplicity:

- inflow Lp.1 = 4 x 28.3 = 98 m3/h;

- exhaust L wat.1 = 6 x 28.3 = 115 m3/h.

A visitor hall.

Number of seats 30. Supply air calculation is calculated based on 20 m3/h per person:

Description of the adopted technical solutions

3.2.1. Ventilation

To create regulated sanitary and hygienic conditions, supply and supply systems with mechanical and natural motivation have been designed (see "Table of air exchanges").

The building has one independent mechanical plenum ventilation system P1.

The plenum plant is located in the space of the set ceiling in the corridor (room 6), air intake is carried out through an air intake shaft exiting to the roof of the building.

The coolant for the heat supply needs of the plenum plants is water with

parameters 9070° С, obtained from the heat supply system of the building .

An exhaust umbrella (see Table 5) - B3 system is provided in the hot shop for localization of hazards released from thermal equipment.

In addition, the building provides the following independent exhaust systems:

B1 - bathroom for visitors (pom. 1, 1st floor);

B2 - bathroom for personnel (pom. 11);

B3 - hall for visitors (pom. 1), hot shop with sections (pom. 2) washing tableware (pom.3), vegetable workshop (pom. 7), meat and fish workshop (pom. 8);

B4 - hall for visitors (pom. 1), administrative room with wardrobe (pom. 10);

VE1 - wardrobe for visitors (pom. 2, 1st floor);

BE2 - the room of harvest stock (room. 12);

BE3 - the administration premise (room. 10).

At the bottom of the door to the administrative room (pom. 10) place the overflow grating RP 100x300.

External air supply and removal of internal air in the rooms is carried out from the upper zone.

In all rooms where there are windows, provide ventilation through opening window frames.

Exhaust holes of exhaust systems are located at a distance in plan of ≥10 meters and vertically of ≥6 meters from the place of air intake for plenum ventilation and from room windows.

Total heat consumption for heat supply of heaters = 38.82 kW.

3.2.2. Used materials for ducts, pipelines, thermal insulation.

Heat supply system pipelines are made of steel water and gas pipes as per GOST 326275 and steel electric welded pipes as per GOST 1070491.

Air ducts of ventilation systems are made of galvanized steel 0.51.0 mm thick according to GOST 1990491.

Pipelines of heat supply systems are insulated by mineral wool with coughed foil f. "Rockwool" 20 mm thick.

Equipment used: f. VTSClima, ф. SystemAir (channel ventilation equipment).

All equipment used is certified.

Measures to limit noise and vibration.

To combat the spread of aerodynamic and mechanical noise in the premises arising from the operation of ventilation and air conditioning equipment, the following measures are provided:

• ventilation units are attached to structures through rubber inserts;

• air ducts are connected to fans using flexible inserts;

• accepted air speeds in ventilation systems are not more than permissible;

• fan operation is selected in maximum efficiency mode;

• ventilation systems have silencers.

instrumentation and automation.

The automation section of ventilation systems is not included in this section and is carried out by a separate project .

Conclusions

Decisions on ventilation made in this project for production premises comply with the current sanitary rules and standards for the remaining premises in accordance with other applicable norms and rules.

To ensure permissible microclimate values at workplaces, the following are provided:

- air temperature difference in height not more than 3 ° С;

- air temperature drop horizontally, as well as its changes during the shift does not exceed:

for work category Ia - 4 ° C;

for work category IIa and IIb, 5 ° C.

Noise level in rooms is not higher than permissible values of sanitary rules and noise standards.