Humidity control

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  • (BQ) Part 2 book "Fundamentals of industrial instrumentation and process control" has contents: Humidity, density, viscosity, and pH, other sensors, actuators and control, signal conditioning, signal transmission, process control, documentation and symbols.

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  • Generally the term photonic crystal refers to two dimensional (2-D) and three dimensional (3-D) structures. Using 2-D and 3-D photonic crystals it is possible to control the propagation of light at arbitrary angles of incidence and not only the light normally incident as is the case for conventional optical films. Further, using photonic crystals, it is possible to achieve optical functionality not possible using conventional optical materials. This book provides a complete overview about photonic crystals including properties, applications, approaches and methods for the study....

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  • How Direct Expansion Air-Conditioning Achieves Performance Goals For most of the A / C market, refrigeration-based ( DX ) cooling is the standard, and provides a point of comparison for new technologies. To describe the benefits and improvements of DEVap A / C technology, we must discuss standard A / C. Standard A / C reacts to SHR by cooling the air sensibly and, if dehumidification is required, by cooling the air below the dew point.

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  • In addition to ventilation, indoor temperature and humidity conditions, which can change both diurnally and seasonally, have the potential to substantially affect the emissions of VOCs from building materials and alter occupant exposure. In large-scale chamber experiments with new carpet systems, sheet vinyl flooring and wall paint, the air temperature was increased from 23 o C to about 30 o C over a period of 60 h (Hodgson, 1999).

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  • Humidity promotes the growth of moulds Credit: Infrogmation The majority of the health effects linked to dampness and moisture of buildings are those of the respiratory system. They range from irritation of mucous membranes, respiratory symptoms, and infections to diseases such as asthma and allergy. However , it is still not known precisely how dampness leads to these symptoms and which are the main substances responsible. Humidity problems in buildings may originate from leaks, condensation, or the ground.

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  • Onewaytogetaroundthissituation istounderstandthewateruseofcropduringgrowth,as this period demands maximum input. With this information, the contribution/influence of energycropsonwaterresourcescanbeunderstood.Waterrequirementsofaplantspeciescan becalculatedbyestimatingtheminimumamountofwaterperhectareyield(orwater limited yield),whichisbasedonthepotentialyieldofthecropspeciesandtheavailabilityofwater. Wateruseofplants(evapotranspiration) isdependentontheplantspecies.

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  • Tuberculosis is transmitted from person to person by respiratory droplets. Although some people develop active tuberculosis disease after infection, almost all tuberculosis infections are asymptomatic and remain latent. Latent tuberculosis infection (LTBI) itself progresses to active disease in approximately 5% to 10% of infected persons. The rate of progression is much greater in immunocompromised individuals. The estimated 2 billion people living with LTBI represent a vast reservoir of potential cases of tuberculosis around the world.

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  • By definition, air conditioning involves control of the air temperature, humidity, cleanliness, and distribution. It follows that an air-handling unit (AHU) of some kind is an essential part of an air conditioning system, though not necessarily of a heating-only system. The function of the AHU is to provide air at a quantity, temperature, and humidity to offset the sensible and latent heat gains to the space (in the cooling mode) and the heat losses (in the heating mode), while maintaining the required temperature and humidity in the space....

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  • Written by an expert with over 20 years of experience in the field, this timely volume provides - in a single source - all aspects of humidity measurement and instrumentation, including rudiments and theory, common applications, advantages and limitations of frequently used sensors and techniques, and guidelines for installation, maintenance, and calibration.

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  • The conservation of glass, as of all artefacts, falls into two main categories: passive conservation, the control of the surrounding environment to prevent further deterioration; and active conservation, the treatment of artefacts to stabilize them.

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  • EVOLUTION OF SERVO DRIVES The word ‘‘servo’’ is a learned borrowing from Latin where it meant ‘‘slave.’’ Industrial servos had their real beginning during World War II. Some applications were in military gun control and steering control. The evolution of speed and positioning drives since the war is shown in Figure 1.

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  • Thermoregulation Heat loss occurs through five mechanisms: radiation (55–65% of heat loss), conduction (10–15% of heat loss, but much greater in cold water), convection (increased in the wind), respiration, and evaporation (which are affected by the ambient temperature and the relative humidity). The preoptic anterior hypothalamus normally orchestrates thermoregulation (Chap. 17). The immediate defense of thermoneutrality is via the autonomic nervous system, whereas delayed control is mediated by the endocrine system.

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  • The coefficient of interest, γ1, is the percentage effect of HNC on air pollution. The vector of covariates, xt, includes indicator variables for month of the year, day of the week, and hour of the day as well as interactions between weekends and hour of the day. In addition, xt includes weather variables including current and 1-hour lags of quartics in temperature, humidity, and wind speed. 14 Equation (1) is first estimated using least squares (OLS) for four different time windows rang- ing from 1986-1993 to 1989-1990.

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  • Service gauges play an important role in diagnosing faults on refrigerating equipment. Low suction pressure can be related to a number of faults. It is normally associated with restricted refrigerant flow to the evaporator, but in some cases it can be due to the improper setting of a temperature control. As well as maintaining a design temperature, it is vital that the correct humidity conditions are achieved for the type of product being stored. It is important that the temperature difference (TD) between the product being stored and the refrigerant is correct for that product.

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  • Functions of an air conditioner: A. temperature control B. air conditioning C. odor removal D. germicidal treatment E. noise control F. air motion G. relative humidity II. Spaces: Auditoria Commercial offices 3. Apartments 4. School class rooms Motels Example: In an auditorium, the three most important functions of an air conditioner are to control the temperature, to remove odour and to control noise

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