Tag Archive for Air Conditioner

Central Air Conditioner Vs Portable Air Conditioner

A central air conditioner and a portable air conditioner give different sets of benefits. When considering which type of air conditioner to choose, the following factors will help you choose the one that best suits your requirements.

Installation: There is a great difference between the installation processes of these units. Central air conditioners are installed permanently. A duct-work in the wall, ceiling or floor, holds the central unit. On the other hand, portable air conditioners are easy to set up because they do not require any installation, as the name suggests they are portable.

Energy consumption: There is a great variation in energy consumption of the two. A portable unit if kept in every room of a large house, it will consume more energy than a central air conditioner.

Convenience: Buildings that are difficult to renovate or reconstruct, portable air conditioners are best for such buildings. People who live on rent often prefer portable units because they can easily carry it as and when they are planning to move. When owning or constructing a house, if you are deciding to install a central unit, make sure to have provision in walls or ceilings or floor. This will help you in fixing the central air conditioner. Central air conditioning units have a good system for cooling the entire house, building, etc.

Space consumption: As the central air conditioners are attached to the duct work of wall or floor or ceiling, it does not occupy place on wall or floor as a portable unit does. Moreover, they are noiseless and comfortable when compared to portable units.

Ventilation: Portable units need some ventilation or should be installed near window to take away the moisture and if there is excess moisture, the air conditioner fails to cool the indoor air. If there is no window, you need to make provision for the window. If you are not willing to make any provision or modifications in the wall or ceiling, it is better to consider central air conditioner because it doesn’t require a window, it is simply installed to the duct work of the wall.

Maintenance: When it comes to maintenance, portable air conditioners require more maintenance than central air conditioners. It is not that central air conditioners don’t require any maintenance, they also should be maintained for efficient operation.

Warranty: Central units come with longer warranty, whereas portable air conditioners have lesser warranty period.

Before purchasing a particular air conditioner, get to know about the pros and cons of it as it will help you in deciding the best.
Read more

Get to Know about Types of HVAC systems

ID Fan manufacturersHVAC (Heating, Ventilation and Air Conditioning) systems are designed to perform four main functions – heating, cooling, ventilation and controlling humidity levels. HVAC systems are designed to meet goals of its customers and satisfy them in terms of efficiency of system and saving energy. Many HVAC systems are available today and are designed for both homes to industries. Selection of HVAC system is critical because improper selection may cause discomfort in terms of health and loss of money. This article tells you about types of HVAC systems.

Though there are many type of HVAC units, there are four broad categories.

Constant air volume (CAV) HVAC systems

Constant air volume HVAC systems work by use of constant supply of air volume by distributing hot or cool air. Constant air volume HVAC systems are installed in large spaced rooms (auditoriums, theaters, lobbies, hospitals, manufacturing units, etc.). There are three variants of CAV systems: single duct, reheat and multi-zone systems.

  • Single duct system: A single duct CAV is a simple central air conditioner with single zone distribution for either cool or hot air throughout the building at a fixed temperature (usually 55O F). This fixing of temperature allows to maximize cooling load in all spaces.
  • Reheat system: The reheat system is modified single-zone distribution system that uses electricity or water to heat coils. Reheat coils reheat the cool air flow and distribute controlled air throughout the building. It is used in hospitals, laboratories and other buildings, which require wide load variation.
  • Multi-zone system: Multi-zone system has two distribution systems, one for heating and other for cooling. Both ducts are designed to meet at one place called “mixing box”. This mixing box controls and distributes the required air temperature throughout the building.

Variable air volume (VAV) HVAC systems
Variable air volume systems are economical to install and are more energy efficient to bring down the cost by 10 to 20% compared to constant air volume systems. This system is best to meet varying cooling and heating needs of building areas.

The design of VAV system is simple and has small units that make installing easier. The main air duct provides cooling at 55O F and this is called primary air. A thermostat controls the temperature of primary air delivered to each room. This modulates the volume of air supply to get the required room temperature in different rooms according to cooling needs.

The main advantage of using VAV comes by its efficiency in dehumidification and temperature control by fan that efficiently reduces over all cooling or heating bills.

Radiant air conditioning (RAC) HVAC systems
Radiant air conditioning system refers to temperature controlled surface (hot/cold water or electrical heating coils tubing) that heats or cools indoor air temperature before air goes into the room. Radiating air conditioners install metal tubing on the surface of ceiling or walls of home or offices.

In this system, as air passes through metal pipes along the the concrete ceiling or walls, it gets warmed or cooled before it goes into the indoor environment. From these tubing, heat or cooling is transferred from ceiling or walls to warm the indoor air. The use of RAC has many advantages – no duct work is required, quite and energy efficient, no need of cool air exchanger, zoning capabilities and finally even temperatures for comfort. RAC is a power saving system that allows users to get comfortable temperature at home under lower temperature.
Advanced radiant RAC systems make it possible to control individual room in buildings. There are different types of radiant air conditioners and the most common types are electrical and gas fired systems.

Zoned System
Zoned system is a single area where temperature is regulated by singe thermostat. If a building’s temperature is controlled by a single thermostat, it is called single-zone. When multiple thermostats are used in a building, it is termed as multi-zone system.

In single zone HVAC system, single thermostat maintains same room temperature across different zones of same building. While in multi-zone system, each room is equipped with one thermostat to receive air with different temperatures based on the need of users.

Multi-zoned system is more advantageous over single-zone, as multi-zone system can efficiently control air-conditioning requirements. They are able to direct hot or cool air for certain rooms when needed. This offers wastage of power utilization for cooling or heating your building.

Use of zoning system enables you to save around 30% or more cooling/heating on power bills. Since zoned HVACs run based on your requirements at single or more rooms, it makes HVAC to run at lower speed and thus run quietly, and hence ergonomically good.

Additional Resources:
WITT INDIA Pvt. Ltd., – World Class Axial, Radial and Jet Fans

Know About Green Air Conditioner

Generally Air Conditioners release hydro chlorofluorocarbons into the air, causing depletion of the ozone layer which protects the earth from UV radiations. A green air conditioner is the solution for this problem as it helps in the carbon foot print reduction which causes minimal pollution.

Going green directs to reduction in the consumption of fossil fuels and also reduction in the release of green house gases. Green AC protects the users from global warming and acid rains caused because of green house gases. Ductless green air conditioners, also referred to as split systems, regulates the temperature in rooms individually. According to the EPA, users can save up to 30% in energy costs by installing or retrofitting a green air conditioning system.

Tips for Installing Green Air Conditioning:

  • Increase Attic Insulation- Adding more insulation is one of the best investment strategies to get a return on investment in a matter of few months to few years.
  • Install Radiant Heat Barriers- These are a thin layer of metal insulation which can reduce radiant heat transfer.
  • Install Programmable Thermostats- Programmable thermostats help to reduce energy consumption.
  • Install Ceiling Fans- The breeze created by a good ceiling fan can eliminate the need to run your AC on cooler days. It also helps to distribute warm air in the winter, helping to reduce energy costs.
  • Seal and Insulating Duct work- Poorly sealed duct work can reduce the cooling efficiency of air conditioning system, because air can run through uninsulated spaces like attics, garages and crawl spaces.

Benefits of Air Conditioners, Air Purifiers and Ventilation Systems for Hospitals

Hospital Air Conditioning is more important because these days proper air conditioning has also become a factor in patient therapy and in some cases controlled environment provides more rapid physical improvement as the growth of many disease causing organisms is influenced by the surrounding temperature. Hence, proper air conditioning is found to play an important role in the prevention and treatment of diseases. Apart from controlled temperature, indoor air quality in the hospitals should also be maintained at the acceptable levels because there are large number of bacteria and virus spread in the hospital environment. Air purifiers and proper ventilation system help in improving the indoor air quality.

The benefits of having proper air Conditioning System, air purifiers and ventilation systems in the hospitals are:

  • Air conditioning system restricts the movement of air between the various departments of the hospital.
  • Ventilation and filtration helps in the dilution and removal of contaminants, which are in the form of airborne microorganisms, viruses, odor, hazardous chemicals and radioactive substances.
  • Air conditioners provides different types of temperature and humidity required for various areas in the hospital.
  • All the above systems helps in controlling the environmental conditions, quality and circulation of the air.
  • Patients with some diseases such as thyrotoxicosis, cannot tolerate hot and humid conditions, in such cases, a cool and dry environment favors the loss of heat by radiation and skin evaporation which may save the life of a patient.
  • In some cases dry conditions may prove hazardous to the ill and debilitated persons, contributing to secondary infection. In such cases, AC is helpful in preventing these dry conditions.
  • It also reduces operational costs and maintenance costs for a hospital.

Designing of an energy efficient air conditioning system by a hospital according to its needs and best international practices, delivers a high quality product that is heath safe.

Additional Resources:
Fans for Tunnel and Underground Ventilation – Witt India Pvt. Ltd.

Benefits of Air Conditioning for Schools

An air conditioner (AC) is a mechanism designed to dehumidify and extract heat from an area. The cooling by an air conditioner is done with the help of a simple refrigeration cycle. Schools use air Conditioning system to maintain low humidity levels. Schools, colleges and universities can save energy by an energy efficient approach through air conditioned campus. By installing a web-based, real-time, online energy monitoring technology, schools can accurately monitor and track energy levels 24/7, consumed by air conditioners.

Schools that implement a green air condition system will experience reduced energy expenses and encourage better student performance. Green air conditioning systems also facilitate carbon footprint reduction. Space cooling and ventilation consumes up to 8% of a school’s total energy costs and according to the EPA, schools can save up to 30% in energy costs by installing or retrofitting a green air conditioning system in the campus. Use of the green air condition helps in the reduction of emission of green house gases like carbon dioxide and nitrogen oxide which causes smog and acid rain.

Air conditioning system combined with proper ventilation system also enhances the indoor air quality. Use of air conditioners in the school reduces absenteeism as it keeps the students and the staff healthier.

Although AC offers a number of benefits for the schools, there are some disadvantages for schools, such as, an air conditioning system like AC equipment is costly and it makes noise which may cause disturbance to the students.