The Role Of HVAC In Maintaining Indoor Air Quality

Air quality, temperature, and lightings may affect your productivity as well as your health condition. HVAC system offers comfortable air temperature and ventilation to your environment. Having regular maintenance on HVAC is important because it will tell you if the system is still properly working or needs a repair. You need to check if your system has dust, pollen, debris, leaks, or ice molds. These will affect the performance of HVAC as well as the indoor air quality or IAQ.

What Is An IAQ?

IAQ is a metric that can evaluate the quality of air in your surroundings. It is vital to monitor and to have a standard IAQ because the poor quality of air may affect your health. The IAQ rating can easily be affected by dangerous gas like carbon monoxide. IAQ rating is between 0 to 500 and it is directly proportional to the health status of everyone. Having low values of IAQ represents good quality for the environment while the high values indicate toxic air.

Factors on Having Good IAQ

According to mechanical engineers and designers, it is really important to include the IAQ in designing your HVAC system. If you want to have a good quality of indoor air you must improve your source control, filtration, and ventilation structure. A demand control ventilation can consume less energy and determine the percentage of the gas in the indoor air by using the carbon dioxide sensors.

Air filters on the HVAC system can trap the dirt and pollutants from the air. Once you reached the MERV or Minimum Efficiency Reporting Value of less than 13, it means that you have good air in the surroundings. This standard came from the ASHRAE community or the American Society of Heating, Refrigerating, and Air Conditioning Engineers. The filters can also control the dirt going into the HVAC coil. This will contribute to a good production of indoor air quality in your area.

Humidity is also a great factor in the quality of the indoor air. If you have high humidity, you are giving the opportunity for the moisture and mold to grow. When you notice that the humidity increases it is better to adjust your HVAC system immediately. The dew point temperature is also important, the value should in between 40-to-50-degree Fahrenheit. You must always check the filters on your indoor and outdoor unit and conduct a regular filter cleaning. The cleaner the filter is, means higher the ability to trap the dirt in the circulated indoor air.

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The Proper Way To Ventilate A Home

Most individuals are excited when they just bought their new ventilating system for their home. Several visitors would really raise an eyebrow after knowing that your house has a very outstanding ventilating system. Yet, how to properly ventilate your home is crucial.  Several people believed that the most efficient HVAC on the marketplace offer comfortable aeration and this creates a high demand.

Meanwhile, a lot of people may be pondering, should every home must have such proper ways to ventilate a home? Thousands of individuals perhaps think that this is just some sort of energy-consuming unit that households often can’t ignore. There are numerous whys and wherefores that ventilation is even more important today than that it was long ago. Most importantly, homes, about few decades before are actually permeable. Usually, homes before didn’t have insulation in the dividers, so fresh air could pretty easily enter through all the holes and spaces of the building.

Further, the need of proper ventilation is now a requirement these days because there are many existing common ailments due to air pollution.  Much better ventilation is provided through a stable system in which separate fans drive both inlet and exhaust flow of air. This lets people to find out and manage where the fresh air comes from, where that fresh air is brought, and from where exhaust air is drawn. Stable ventilation systems can be either point-source or ducted.  If there are discrete fans to present fresh air and exhaust indoor air, it makes a lot of sense to trace these fans together and comprise an air-to-air heat exchanger so that the outgoing house air will precondition the incoming outside air. 

All households should have mechanical ventilation. If the house is insulated and tauter, this is where you need a proper ventilation system. But even in a very drippy house, one can’t count on getting abundant fresh air or peaceful days during the spring season and fall season when there isn’t enough air to inhale across the building structure. If budgets allow, getting a ventilation system is intensely suggested, and if people are getting that in a comparatively cold weather, then getting heat recovery might be not ideal.

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How To Choose the Right Control Valves for an HVAC System

HVAC (Heating, Ventilation, and Air Conditioning) systems are not only systems needed in buildings and establishments, but also famous household essentials. They are responsible for the regulation of heat, air flow, ventilation, and air conditioning of your home.

HVAC systems control the overall climate of your home. They make proper adjustments especially when there are changes in outdoor temperature. During the winter season, HVAC systems work in keeping indoor temperature at your most comfortable preference. And during the hot season, HVAC systems work in regulating air temperature by providing necessary cooling.

These powerful systems not only control the temperature inside your home, they also improve the quality of air inside. HVAC systems nowadays are made automatic, meaning you don’t have to manually adjust the time and temperature settings.

Choosing the Right Control Valves for an HVAC System

A control valve is the single most important element in a fluid-handling system. With the development of new control valves in a globally competitive market, choosing the right valve is will have great effect in a system’s efficiency. There are different valves available on the market, and you have to first know the requirements needed for its usage, then pick the valve that meets those requirements.

  • What are the maximum and minimum temperature and pressure requirements?

Always be knowledgeable on your house size as this will determine the kind of HVAC system that you will be needing.

  • Calculate the required CV or the flow of water through a valve.
  • Check for proper close-off rating.
  • Make sure the valve is suitable for the system pressure rating.

Choosing the right control valves will be a step in having the right HVAC system suited for your house. It is always best to consult professionals for wider scope of information regarding HVAC systems, but it’s also good when you have basic knowledge on control valves and how HVAC systems work.

The following are the different types of control valves available in the market:

  1. Ball valves – designed to regulate the flow of water and steam in response to the demands of every HVAC system.
  2. Butterfly valves – high integrity components engineered for a wide range of HVAC applications.
  3. Globe valves – controls the flow of hot or chilled water and steam.
  4. Pressure independent control valves – designed to eliminate the need for separate balancing valves.
  5. Zone valves – provides economical and accurate control of hot or chilled water.
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The Role Of Dampers In HVAC Zone Control Systems

Dampers are responsible for controlling the airflow of the HVAC system while the actuators interface the control system and the mechanical system. According to the experts, around 80% of DDC or Direct Digital Control outputs from the HVAC goes to the hand of actuators. Air duct dampers can be found on the zone control systems and it controls the climate of the inside air based on the pre-set temperature settings. These systems can separate the areas on a building and maintain a unique degree of temperature based on the need of each area.

The Benefits Of EZC Systems

Thermostat sensors, control panels, and dampers are incorporated by the zone control systems in order to have a smooth operation. Dampers are like valves that control the volume of the air going to identified zones. These are connected to thermostats to figure out the exact measure of temperature in each zone. Once the thermostat reads the actual room temperature, it will automatically give a signal to control systems and advice the dampers to close or open until they achieved their desire temperature.

Preferred Temperature From HVAC System

A zone control system should be professionally installed because it can offer long-term advantages. They allow people to control the temperature in a specific area without adjusting the other zones’ settings. It can also offer an automated setting of temperature without compromising the comfort of folks in the area.

Dampers follow the signal control from the EZC system. It will tell how much air should the damper release on a specific area. It can also help the operator to save energy and money. An HVAC system that doesn’t have an EZC system will just have a regular flow of air coming from the dampers and will require more energy and affect the life of the system.

HVAC systems can be modified by a zone control system to have accessible ductwork. Professional installers place the dampers inside the air duct to execute the flow of air based on the thermostat sensor. The dampers will deliver cooling air according to the needs of the area. There are some instances that a zoning system requires an additional consideration like air pumps. This will execute and monitor the parameter of static pressure. High-rise buildings have various ducting systems and dampers. These are responsible for giving the right amount of air with different degrees of temperature. The zoning systems can adjust the supply of air based on your preferred climate. It can automatically detect by the thermostat or you can set your own temperature.

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Is An HVAC Temperature Controller The Same As A Thermostat?

It is a common knowledge that every air conditioning system has a thermostat. The main function of this is to set the temperature in one’s space whenever necessary or when it set to do so. The thermostat exerts its control by switching heating or cooling by regulating the flow of a heat transfer fluid as needed in order to maintain the correct temperature. Literally, it does turn on and off the air conditioning once it reaches the certain temperature that had been set up on it. There are even more advance kind of thermostat that can determine how frequent does the air conditioning needs to run in order to maintain the temperature. These over-the-top kinds of thermostats can actually adapt settings at home depending on the lifestyle. This happens for example when a house or one’s space is unoccupied, the control will automatically adjust the settings to save energy and enhance comfort. It also follows routine like sleep time or wake up time.

Now, when it comes to HVAC, there is a chance that the flow on heating and cooling demand may overflow especially if pumping system operates at its full speed. That is why there is what is commonly called as control temperature in HVAC system that has temperature controller that receives sensor signals and control heaters or other devices to maintain the preset temperature. This does not only focus on the degree of thermal condition but as well as on the humidity, pressure and flow rate control.

In HVAC, the temperature controllers have options of control methods. These could be by enumerated as follows:

  1. On/Off Control Action
  2. P Action or Proportional Control Action
  3. I Action or Integral Control Action
  4. D Action or Derivative Control Action
  5. PID Control
  6. Two PID Control

In conclusion, the thermostat and temperature controller has somehow similar function. Both of those are used in ensuring that certain preset temperature will always be achieved.

Ending this article with a note on how exactly the air conditioning and HVAC works. In AC, it is not exactly the unit gives the cooling but rather it suctions the heat of the room and pump it out outside. While on HVAC, through coolant liquid, it reduces the temperature of the air while sending hot air outside and cold air inside. The transit system for hot and cold air throughout the home is called ductwork.

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How a Pneumatic Damper Actuator Works

A Pneumatic damper actuator mostly contains a diaphragm  or a piston which advances the motive power. It retains the air in the upper part of the chamber, permitting air compression to force the piston or diaphragm  to move the valve stem or swap the valve control component.

Valves necessitate little pressure to operate and frequently double the input force. The greater the size of the piston, the greater the amount of pressure can be produced. Having a bigger piston can also be good if the air supply is low, allowing the same forces with less input. In crushing objects in the pipe, these pressures are great enough. You could lift a small car upwards of 1,000 lbs effortlessly, and this is merely a simple and small pneumatic damper actuator on 100 kPa input. Nevertheless, the subsequent forces essential of the stem would be excessively abundant and grounds the valve stem to be unsuccessful.

The pressure is transported to the valve stem, which is attached to either the butterfly plug,  valve valve etc. Bigger forces are compulsory in great pressure or extraordinary flow pipelines to let the valve overcome these forces, and permit it to transport the valves moving parts to control the material rolling within.

The control signal is the valve’s input. This may originate from a diversity of measuring devices, and each different pressure is a different set point for a valve. A typical standard signal is 20–100 kPa. For example, a valve could be controlling the pressure in a vessel that has a varied in-flow diverse by the actuator and valve along with a constant out-flow. A pressure transmitter will observe the force in the vessel and transmit a signal from 20–100 kPa. There is no pressure at 20 kPa and there is full range pressure at 100 kPa. As the pressure rises in the vessel, the output of the transmitter rises, this increase in pressure is sent to the valve, which causes the valve to hit descending, and begin closing the valve, lessening flow into the vessel, plummeting the force in the vessel as spare pressure is exiled through the outflow. This is known as the direct-acting process.

Like any other home equipment, it is important that you carefully study the equipment you like to buy before actually purchasing it. In addition, if you need to use an actuator at home, you should really be aware how a pneumatic damper actuator works does.

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How To Find A Qualified HVAC Contractor

In the summer and winter holidays, you need to check how your air conditioners and heaters are because a faulty heating system might cost you a lot and make your holidays very uncomfortable. To add to that, you might need to pay for a costly expense in case you need to get a repairperson to work on the holidays. To make things easier for the holidays, a professional or a qualified contractor and HVAC specialist should be contacted as early as possible.

Hiring a contractor for HVAC

Most places where you can hire a contractor for HVAC can be found online, but if you know of a local heating and ventilation service center, a quick look at some way to hire them is a must.

  • Check your locality – an HVAC contractor might just be found around the corner if you are aware of some places in your local area that offers them. A quick drive or stroll in your neighborhood or town can give you an idea
  • Look up online – these days, searching up for something online is so common that if ever you need help for something, it is sure to be available on the web.
  • Get referrals – friends or neighbors might know of someone who is actually qualified and performs well. Coming from someone you know well adds up to the trust you can place to a contractor
  • Call references – you can get information from customers who have gone through a service. Chances are you can easily get information about their performance and credentials.

Performance matters

With people who does manual jobs, their credentials matter for this tells you that an HVAC contractor have undergone proper training to handle the job. This is where you get to see their certifications and technical credentials for the job. Most contractors provide their credentials online for easy reference for people who look up online. In addition, many of the local providers may see to it that they employ the right people who are well acquainted for their job.

Estimations and home evaluations

Part of the contractor’s job is to help evaluate the equipment and home. This would help them assess the cost and needed things to take care of the job. Estimations give a brief overview of how much should be allotted for the heating and ventilation expense. Usually, it is better to work together to know how things work and for the contractor to have an idea of the whole house setting.

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