Study of the fire resistance rating of fire dampers in the ventilation system

Summary

The results of testing fire dampers of the Vertro trademark: KZО-2-60-800×800-O-S220-T-KR, type KZО-2-60-O, KZО-2-90-800×800-O-S220-T-МC-KR, type KZО-2-90-O and KZО-2-120-800×800-O-М220-T-KR, type KZО-2-120-O against the declared fire resistance rating are considered. Fire dampers (fire-stopping) are designed to block the ventilation ducts in order to stop further fire spreading, supply fresh air to the fire sources, and provide for the smoke and other combustion products exhaust. The three valves are normally open, single-cassette with one flap, channel, with an outside drive. The valve body is made of galvanized steel. Along the flap perimeter there is a thermoactive seal that expands under the action of high temperatures and ensures the valve tightness. The flap is made of fire-resistant glass-magnesite. Depending on the fire resistance rating, a flap of different thickness is used. According to the test results, it was confirmed that the valves meet the fire resistance rating declared by the manufacturer.

Key words

ventilation system , fire damper , fire resistance rating , smoke exhaust

Specifics of ensuring the warm air parameters of microclimate
in the local wastewater pumping stations

Summary

The specifics of modeling of warm air conditions in the pumping compartment of a local wastewater pumping station is presented. Calculated values for incoming air temperatures at an average room temperature of +5°C are determined. The required thermal output of air heaters for the input ventilation system is presented for two heating system configurations for the pumping compartment of a pumping station. The main characteristics and assumed values of additional auxiliary coefficients used in modeling air-heating processes in the local wastewater pumping station are described in detail. A review of possible supply and exhaust system configurations for the facilities under consideration is provided. A flash estimate of the supply air temperatures is provided for air- and combined heating with electric cable. This work is of interest to companies specializing in the design, operation, and sales of local pressure wastewater disposal systems for buildings and structures.

Key words

sewerage pumping station , pump , ventilation system , electric motor , air-heating process , microclimate control system

Improvement of Energy Efficiency of Pipeline Systems of a Building

Summary

Problems of the power saving in construction can be solved by means of reducing heat losses through the enclosing structures, installing heat and water meters, using nontraditional sources of heat supply et al. Issues of energy saving in pipeline engineering systems in the course of designing are not studied enough while a considerable part of power consumption by the systems of engineering support of buildings (up to 80%) falls on the drives of pumps and ventilators of pipeline networks: heating, water supply, ventilation, and air conditioning. Economic indexes are considered as criteria of energy efficiency of pipeline networks. The method of reduced expenditures is used for calculations.

Key words

energy efficiency , power consumption , heating system , ventilation system , reduced expenditures , rate of working medium movement