Air con
Air Conditioning Knowledge Quiz
Test your knowledge about air conditioning systems and their applications in various industries! This quiz contains a collection of multiple-choice questions that cover everything from the history of air conditioning to its technical principles.
Complex concepts made simple:
- Learn about the evolution of air conditioning.
- Understand the science behind HVAC systems.
- Explore the different applications of air conditioning across industries.
Used for providing cooling and dehumidification in summer for personal comfort (air conditioning). And it also used extensively for providing thermal comfort to human beings by means of air conditioning
Refrigeration systems
Conditioning systems
Heat pump
The first air conditioning systems were used for industrial as well as comfort air conditioning. Eastman Kodak installed the first air conditioning system in year
1912 Rochester, New York
1895 Rochester, New York
1891 Rochester, New York
1999 kwarto ni molen
The term ____________ will refer here to providing at least a partial measure of comfort for workers in hostile environments but also to controlling air conditions so that they are favorable to material processing.
Refrigeration systems
Industrial Air Conditioning
Conditioning systems
Spot Heating
A refrigeration system can also be used as a heat pump, in which the useful output is the high temperature heat rejected at the condenser.
True
False
It may be more practical to warm a confined zone where a worker is located. One such approach is through the use of an infrared heater.
Spot Cooling
Spot Heating.
Environmental Laboratories.
Ï‚· Printing
It may be impractical to cool an entire steel mill, but conditions may be kept tolerable for workers by directing stream of cool air onto occupied areas.
Spot Heating.
Environmental Laboratories.
Printing.
Spot Cooling
This may involve precision measurement to performance testing of materials, equipment and processes at controlled temperature and relative humidity. The role of air conditioning varies from one type of laboratory to another.
Environmental Laboratories
Spot Heating.
Spot Cooling
Printing.
Humidity control is one of the primary reasons for air conditioning printing plants. In some printing processes, the paper is run through several different presses and the air conditioning must be maintained to provide proper registration.
Environmental Laboratories
Spot Heating.
Spot Cooling
Printing.
______ are sensitive to changes in humidity and to a lesser extent changes in temperature.
Textiles
Precision parts and clean rooms.
Photographic products
Computer Rooms.
keeping the temperatures uniform so that the metal will not expand and contract, maintaining a humidity so that rust is prevented, and filtering air to minimize dust.
Precision parts and clean rooms
Photographic products
Photographic products.
Computer Rooms
The photographic-products industry is a large user of air conditioning and refrigeration. Raw photographic material deteriorates rapidly in high temperatures and humidities and other materials used in coating film require careful control of temperatures.
Textiles
Precision parts and clean rooms.
Photographic products.
Computer Rooms.
. Some electronic components operate in a faulty manner if they become too hot and one means of preventing such localized high temperature is to maintain the air temperature
Computer Rooms.
Photographic products
Precision parts and clean rooms
Textiles
Traditionally steam _______ were kept tolerable for workers by ventilating with outdoor air.
Photographic products.
Computer Rooms
Power Plants
Farm Animals.
Low temperature results in more efficient digestion of food and increase in weight of cow and the milk yield. Animal barns have to be ventilated in any case since their number density is usually very large. In many countries, evaporative cooling is used for creating comfort conditions in animal houses
Farm Animals.
Pharmaceutical Industries
Power Plants
Computer Rooms.
The airborne bacteria and dust must be removed in the air conditioning system by filters. These industries require clean rooms.
Textiles.
Precision parts and clean rooms.
Photographic products
Pharmaceutical Industries.
Window type room air conditioner parts EXCEPT
Condenser fan
Condenser
Evaporator fan
Motor and compressor
Radiator
Evaporator
Capillary tube
Air conditioning involves:
Control of temperature
Control of humidity
Control of air purity
All of the above
The purpose of industrial air conditioning is to:
Provide suitable conditions for products and processes
Provide at least a partial measure of comfort to workers
Reduce energy consumption
Air Conditioning is required in the manufacture of precision parts to:
Achieve close tolerances
Prevent rust formation
Provide clean environment
All of the above
Modern electronic equipment require cooling due to:
Dissipation of relatively large amount of heat in small volumes
To prevent erratic behavior
To improve life
All of the above
Human beings need air conditioning as
They continuously dissipate heat due to metabolic activity
Body regulatory mechanisms need stable internal temperatures
Efficiency improves under controlled conditions
. All of the above
Air conditioning involves various processes such as compression, expansion, cooling, heating, humidification, de-humidification, air purification, air distribution etc
True
False
Another essential element in the analysis of thermal systems is the identification of the pertinent
Thermodynamic properties.
Air conditioning
Vbentilation system
The air condition system properties of primary interest in this text are temperature, pressure, density and specific volume, specific heat, enthalpy, entropy, and the liquid-vapor property of state.
True
False
The _______ of a substance indicates its thermal state and its ability to exchange energy with a substance in contact with it.
Pressure.
Temperature
Density and Specific Volume.
Specific heat.
The normal (perpendicular) force exerted by a fluid per unit area against which the force is exerted. Absolute pressure is the measure of pressure above zero;
Pressure.
Temperature
Density and Specific Volume
Specific heat
A fluid is the mass occupying a unit volume; the specific volume v is the volume occupied by a unit mass
Density and Specific Volume
Pressure
Specific heat.
Temperature
A substance is the quantity of energy required to raise the temperature of a unit mass by 1 K. Since the magnitude of this quantity is influenced by how the process is carried out, how the heat is added or removed must be described
Temperature.
Pressure
Density and Specific Volume.
Specific heat
The constant-pressure process introduced above is further restricted by permitting no work to be done on the substance,
Liquid·Vapor Properties.
Enthalpy
Ideal Gas law
Most heating and cooling systems use substances that pass between liquid and vapor states in their cycle
Enthalpy.
Liquid·Vapor Properties
Ideal Gas law.
As noted previously, the thermodynamic properties of a substance are not all independently variable but are fixed by the state of a substance.
Enthalpy.
Liquid·Vapor Properties
Ideal Gas law.
As energy is the central concept in thermodynamics, its fundamental models and laws have been developed to facilitate energy analyses, e.g., to describe energy content and energy transfer
Thermodynamic Processes.
Thermodynamic Properties.
States that mass is neither created nor destroyed in the processes analyzed
Steady-flow Energy Equation
Conservation of Mass
In many heating and cooling process, the changes in certain of the energy terms are negligible
Heating and Cooling.
Adiabatic Processes
Isentropic Compression
Means that no heat is transferred; thus q = 0. Processes that are essentially adiabatic occur when the walls of the system are thermally insulated
Heating and Cooling.
Adiabatic Processes
Isentropic Compression
If the compression is adiabatic and without friction, the compression occurs at constant entropy
Isentropic Compression
Heating and Cooling.
Adiabatic Processes
S the simultaneous control of temperature, humidity, air movement and the quantity of air in space as well as the distribution to meet the requirements of the conditioned space.
Functions of air conditioning
Ventilation
Psychrometry
Air conditioning
The function of air conditioning is to control the temperature, humidity, purity (that is removal of dust and other impurities) and air movement or circulation
Air conditioning
Functions of air conditioning
Ventilation
Psychrometry
He process of supplying or removing air by natural or mechanical means to or from any space. Such air may or may not have been conditioned
Ventilation
Functions of air conditioning.
Psychrometer
Psychrometry
the study of the properties of mixtures of air and water vapor
Psychrometry
Psychrometer
Functions of air conditioning
Air conditioning
An instrument used in the study of the properties of air
Psychrometry
Ventilation
Psychrometer
A binary mixture of dry air and water vapor.
Dry air
Vapor
Saturated air
Moist air
the non-condensing components of the mixture, mainly the nitrogen and the oxygen.
Dry air
Vapor
Saturated air
Unsaturated air
the condensable component of the mixture, the water vapor or steam which may exist in a saturated or superheated state.
Dry air
Vapor
Saturated air
R is air whose condition is such that any decrease in temperature will result in condensation of the water vapor into liquid.
Dry air
Vapor
Saturated air
Unsaturated air
Air containing superheated vapor
Unsaturated air
Saturated air
S the temperature of air as registered by an ordinary thermometer
Wet bulb temperature (WBT)
Dry Bulb temperature (DBT)
Wet bulb depression (dwb)
Atmospheric air is a mixture of many gases plus water vapour and a number of pollutants
True
False
The temperature of the moist air as measured by a standard thermometer or other temperature measuring instruments
Dry bulb temperature (DBT)
Saturated Vapour Pressure (ps)
Pressure.
S the saturated partial pressure of water vapour at the dry bulb temperature. This is readily available in thermodynamic tables and charts.
Dry bulb temperature (DBT)
Saturated Vapour Pressure (ps)
Pressure.
The total pressure of air-water vapor mixture is the sum of the partial pressures of dry air and water vapor
Pressure
Relative Humidity (Ï•)
Humidity Ratio
Defined as the ratio of the mole fraction of water vapour in moist air to mole fraction of water vapour in saturated air at the same temperature and pressure.
Relative Humidity (Ï•)
Relative Humidity (Ï•)
Dew-Point Temperature
The ratio of the mass of water vapor to the mass of dry air. It is also known as moisture content, mixing ratio or specific humidity.
Relative Humidity (Ï•)
Humidity Ratio
Dew-Point Temperature
The __ of a mixture of dry air and water vapor is the sum of the enthalpy of the dry air and the enthalpy of the water vapor
Specific Volume.
Dew-Point Temperature
Enthalpy (h).
The number of cubic meters of mixture per kilogram of dry air.
Specific Volume
Enthalpy (h)
Dew-Point Temperature
The ratio of the humidity ratio W to the humidity ratio of a saturated mixture Ws at the same temperature and pressure
Degree of Saturation (u)
Specific Volume
Dew-Point Temperature:
The moisture content of air remains constant and its temperature increases as it flows over a heating coil.
Sensible Cooling
Sensible Heating
Heating and Humidifying
The moisture content of air remains constant but its temperature decreases as it flows over a cooling coil.
Sensible Cooling
Sensible Heating
Heating and Humidifying
During winter it is essential to heat and humidify the room air for comfort. As shown in figure below, this is normally done by first sensibly heating the air and then adding water vapour to the air stream
Heating and Humidifying
Sensible Cooling
Sensible Heating
Air can be simultaneously cooled and dehumidified by being drawn over cold surfaces or through sprays of cold water.
Heating and Humidifying
Cooling and Dehumidifying
Cooling and Humidifying
E air temperature drops and its humidity increases
Cooling and Humidifying
Cooling and Dehumidifying
Heating and Humidifying
This process can be achieved by using a hygroscopic material, which absorbs or adsorbs the water vapor from the moisture
Cooling and Humidifying
Heating and Dehumidifying (Chemical Dehumidifying)
Air Mixing
When air at one condition is mixed with air at another condition, the condition of the final mixture can be shown on the psychrometric chart by a point on the line joining the points indicating the original condition.
Cooling and Humidifying
Heating and Dehumidifying (Chemical Dehumidifying)
Air Mixing
An ____ air comes in direct contact with a spray of water and there will be an exchange of heat and mass (water vapour) between air and water
AIR WASHERS
Air Mixing
The sensible cooling load refers to the wet bulb temperature of the building.
True
False
The quantity of air circulated must be adequate to handle the cooling load as the air warms up to room temperatures from its supply temperature
COOLING-LOAD AIR QUANTITIES
COOLING AIR QUANTITIES
COOLING-LOAD WATER QUANTITIES
COOLING-LOAD QUANTITIES
load refers to the wet bulb temperature of the building.
Latent Heat Load
Sensible Heat Load
The use of all outside air with no recirculation is uneconomical unless the outside conditions are close in temperatures and humidity to the inside conditions maintained
All Outside Air Supplied, No Recirculation
Recirculated and Outside Air Supplied
Recirculated Air with External-Bypass System
Recirculating part of the air is more economical than using all outside air, as the temperature of the recirculated air is usually more favorable than that of the outside air
All Outside Air Supplied, No Recirculation
Recirculated and Outside Air Supplied
Recirculated Air with External-Bypass System
The recirculated air is controlled by damper action in order to make it bypass the conditioner. This warmer bypass air is used to reheat the air leaving the refrigerated coils to a more suitable temperature for distribution at the grille outlets
All Outside Air Supplied, No Recirculation
Recirculated and Outside Air Supplied
Recirculated Air with External-Bypass System
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