Heat control ventilation

Heat control ventilation (sometimes called comfort ventilation) is used to control indoor atmospheric conditions associated with hot industrial environments such as those found in laundries, foundries, bakeries, and so on, for the purpose of preventing worker discomfort. In many laboratories, there are significant heat sources that can cause an elevation of the workplace temperature. Obviously, this is not a good or comfortable situation for the workers. Thus, exhaust ventilation is provided to control the heat and humidity to provide comfort. 

Correct storage requirements, procedures (e.g., first in, first out) and conditions such as temperature control issues including insulation, cooling, heating and ventilation need to be determined and implemented. 

Figure 12-142. ASHVE Friction chart for air in duct. (Used by permission Heating, Ventilating and Air Conditioning Guide, 1949. American Society of Heating and Ventilating Engineers, reprinted with permission Air Movement and Control Association International, Inc. All rights reserved.)...

BS 7346, Components for smoke and heat control systems. Part 1 Specification for natural smoke and heat exhaust ventilators. 

One likely trend will be the integration of several functional features in the house, such as integrated control of illumination, safety, heating and ventilation, domestic appliances and audio and video function. This will be called home automation . A whole range of manufacturing areas is targeting this market, including ... 

A prototype heating and ventilation control panel produced by Bayer and Lumitec using a luminescent plastic film system incorporating a special electroluminescent electrode system. The panel can be produced in a single process step using Bayfol films and a PC/ABS blend (Bayblend ). 

Powered ventilation systems in chemical warehouses are typically used for some flammable gas and liquid storage areas (see Gas and Vapor Control, Section 6.6). Heating and ventilation systems and powered roof exhaust systems can be arranged to shut down automatically upon receipt of a fire alarm signal so as not to interfere with sprinkler system operations due to airflow. Furthermore, these systems can also be arranged for manual starting and full exhaust by the fire department for smoke removal during search and rescue operations. 

A well-ventilated garage is a good site for making the hexamethylenetetramine. The neighbors should not pay this process so much attention as the pentaerythritol process because the odor here is less intense and much shorter-lived. No special equipment is needed for this reaction either. All that is required is an electric hotplate with variable heat control, and a large enamelled dish to do the reaction in. 

An area within the interior space of a building, such as an individual room(s), to be cooled, heated, or ventilated. A zone has its own thermostat to control the flow of conditioned air into the space. 

ASHRAE 62, Ventilation for Acceptable Air Quality This standard can assist professionals in the proper design of building ventilation systems. Important aspects of the standard include the definition of acceptable air quality and information about ventilation effectiveness. It makes a recommendation about using source control through isolation and local exhaust. The standard also contains information on the use of heat recovery ventilation and provides a guideline for allowable carbon dioxide levels. 

Heat recovery ventilator (HRV) is the most efficient method to bring in fresh ontdoor air all year-round and which is much more efficient and controllable than just opening windows. HRV incorporate one of several designs of heat exchanger cores. 

Heating and ventilation Type, effectiveness, temperature, humidity, controls, natural and artificial ventilation, and exhausting. 

General exhaust or dilution ventilation can be used for both heat control and/or contamination removal. Dilution occurs when contaminants mix with air flowing through the work area. Usually, contaminants are diluted by mechanically induced air movement with a large volume of outside air drawn in and mixed vtith it. The contaminated air is then discharged to the outside atmosphere. The major disadvantage of dilution ventilation is that a large volume of dilution air may be needed. Thus, this system is normally used for contaminant control only when local exhaust is impractical. 

Change filters in heating and ventilation units to help control dust conditions. 

In addition to the previously noted safety factors associated with these processes, there are additional needs for dust control and ventilation for dissipation of various vapors from pressing, tempering/heat treatment, and machining and finishing operations. 

R. W. Haines, Control Systems for Heating Ventilating and Air Conditioning, Van Nostrand-Reinhold, New York, 4th ed., 1987. 

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