Author: dpadmin

The Most Common HVAC Problems During the Winter

Every season has its fair share of challenges. For your HVAC system, winter can be one of the most challenging. Here are the top five problems that can arise during the wintertime.

1. Freezing Pipes

As temperatures decrease and ice begins to form, coils and pipes can be subjected to freezing. This can result in a systemwide failure. Hydronic systems, like steam radiators and water heaters, could cause the water to stop flowing. And there is nothing worse than not having hot water during the cold winter months.

In extreme cases, the frozen pipes can burst, and the damage can be more catastrophic. This is why it is always important to double check your pipes and systems to ensure there is no freezing, and if there is, contact a professional HVAC company to come inspect it.

2. Inadequate Airflow and Temperature Regulation

HVAC systems that aren’t optimized and inspected for winter could lead to irregular temperatures in the house. Imagine the frustration when you discover one room is colder than the other. Uneven airflow isn’t always an HVAC problem, but if your windows and doors are properly closed, and there are no holes or leaks you are aware of, then it could be an HVAC issue.

3. The Heat Pump Could Malfunction

Not all homes are heated equally. Some rely on heat pumps that are usually outside. Winter weather can cause damage to them, such as coil blockage and broken fans. Another common issue is defrost failure. A properly working heat pump requires its fans and coils to be clear of frost and ice. Luckily, some options allow for automatic defrosting. But in older heat pumps (and malfunctioning ones) you may have to manually scrape the ice and frost off.

4. Heater Filters Need Cleaning

When a heater is overused, the filter can become filled with dirt, dust, and debris. A blocked filter will decrease the air flow, which means the home will be cooler. And unfortunately, not many people realize that they have poor air circulation.

5. The Thermostat is broken

At times, the issue isn’t with the hardware, rather, the thermostat itself. There could be some electronic issue, possibly a faulty wire. It can be a simple fix that can solve a huge problem! A functioning thermostat controls the temperature and can promote energy efficiency.

A Comprehensive Guide to Variable Frequency Drives

Variable frequency drives (VFD) are used in appliances and compressors of all sizes. They can help make electrical motors more efficient. They work by managing the frequency and the voltage so that they use energy in the most efficient manner possible. They are being used more and more as the development of the technologies has made the drives smaller and improved their performance. Here are some things to know about variable frequency drives.

AC Motor
Usually the motor for a variable frequency drive is a three phase induction. This is because such motors are generally the most economical. Less commonly used are wound rotors, permanent magnets, and synchronous motors.

Controller
A VFD has a controller that runs because of three sub-systems. Those sub-systems are the converter, the DC capacitor, and the inverter assembly. The converter stage is where the AC voltage is converted to DC voltage. The DC capacitor assembly and the inverter assembly work in tandem to initiate the three phase voltage. In 1983, the insulated gate bipolar transistor made it so that a VFD cost less and improved its amperage ratings.

Operating
VFDs have an extensive operator interface. It can start and stop the motor, as well as adjust the speed. There are types that allow for reversing the motor and even switching from manual control to automatic. VFDs are operated by either a computer network, digital controls, or the operator interface controls on the unit.

Drive Operations
A VFD will have three options for driver operations. Single quadrant operations are most common, and involve using constant or variable torque. Two-quadrant loads are needed when the torque alters its polarity but the speed is constant. For the highest performance, a four-quadrant load can handle speeds and torques that change direction and force.

Types of Variable Frequency Drives

Controlled Source Inverter
A controlled source inverter (CSI) works by using a SCR converter to convert all the incoming power to DC. CSI have a large internal inductor so that they can work efficiently and properly to handle the incoming power load. The advantages of this type of VFR are that the circuitry is relatively simple, they are very reliable, and they are capable of regeneration. Some of the drawbacks are that it relies on that large conductor, which is expensive, and that it is not compatible with multi-motor applications.

Voltage Source Inverter
Voltage Source Inverters (VSI) are similar to CSI in that the prime function is the covert power to DC by using a SCR converter section. However, VSI drives cannot regulate current, which the CSI drive can do. The VSI can create an adjustable frequency output for motors.

Pulse Width Modulation
The pulse width modulation (PWM) design is the most common drive controller. It can work with the largest variety of motors, and is very reliable. It is the most sold by manufacturers as well, so there are many brands from which to choose. As opposed the the VSI and CSI drives, PWM converts AC voltage to DC voltage. It does this by using an inverter section that also has gate bipolar transistor that are insulated. This creates a near-sine wave output. These drives are a low cost upfront, are compatible with multiple motors, and can operate through a power loss. The only issues are that it cannot regenerate, and can break down because of the switching transistors.

Benefits of Variable Frequency Drives
VFDs come with a host of benefits. For one, they are very energy efficient, in particular with regards to centrifugal load service. Estimates show that well over 60% of all used electrical energy is consumed by power motors. VFDs and other efficient technologies help to reduce that energy footprint.

Performance Control
VFDs allow you to regulate the amount of power a motor delivers. With fixed speed drive, a motor might be delivering more power than is needed. To have better process control, VFDs will regulate that power and only use as much energy as is required.

Now you know about the different types and benefits of using VFDs. Make sure to choose the right one for the job you have to do.

If you want your HVAC system to run more efficiently, the experts at Corporate Mechanical can help. Reach out online or call 763-533-3070.

The Most Common HVAC Myths

A lot of people have differing ideas on HVAC services and repairs. So how do you know what is a myth and what is the truth? Here are the five biggest myths regarding HVAC repair services.

Myth #1: You should only replace your filter once a year
Truth: This is one of the biggest HVAC myths out there. And not only is this a big myth, but it is also a big mistake! You should be changing your filter once a month, not every year. Too many people either forget to replace it, or they believe that you only need to do it once a year. This is even worse for households that have pets.

Myth #2: The bigger the HVAC, the better
Truth: When it comes to HVAC systems, bigger doesn’t always mean better. Especially if it’s for a residential setting. Large HVAC systems are designed for large buildings, not houses. It can be less efficient for a home. Incorrectly sized HVAC systems will have a difficult time eradicating humidity in your home. This is why it is crucial to have a professional HVAC service company to evaluate the best size for your home.

Myth #3: Don’t repair your HVAC unless it’s broken
Truth: When you own a car, you bring it in for routine maintenance. The last thing you’ll want is for it to break down while you’re driving it. Like a car, your HVAC system should have regular checkups done. Inspections ensure that everything is working, which can prevent any unexpected and outrageous costs from happening.

Myth #4: You can easily find air leaks around your home.
Truth: You would think it’s simple to find an air leak in your home, but it can be impossible for an ordinary homeowner to find them all. Even the biggest leaks can be difficult to spot. An experienced HVAC technician will be able to find and fix any leak. They’re well versed in all the ins-and-outs, so you can trust their guided expertise.

Myth #5: The only way to effectively heat the home is by cranking the thermostat
Fact: While it’s clear that your thermostat controls the overall temperature of your home, in reality, it won’t ever achieve the level of comfort with a faulty HVAC system. There are many factors for why your home won’t heat up, which could come down to its overall insulation. Scheduling regular maintenance will ensure that your home will always reflect the desired temperature.

Why your heating bill is too high

As cooler weather approaches, you will eventually have to turn the heat on. While it is obvious that your heating bill will be higher in the Fall and Winter, sometimes it seems too high. Learn which factors can contribute to raising your bill, and some tips you can follow to prevent an outrageous monthly cost.

What are the main factors that contribute to high heating bills?

Change in seasons
The most obvious factor is the change in season. When it’s cold out, we want our home’s to be inviting and warm. Some people will end up dialing their thermostats too high temperatures to rapidly heat the home. If the change is too drastic, your furnace will work even harder, which will consume more energy.

Laundry machine
Surprisingly, another factor is your laundry machine. When it’s cold out, we wear extra layers and blankets. Naturally, our laundry room will be a bit busier, since it will require more washing. You might not realize it, but you probably will end up doing more laundry in the winter. This also contributes to higher utility bills.

Your home is poorly insulated
If you live in an older home, or if it doesn’t have proper insulation, you could be losing a lot of heat through leaks. This could be the main reason why your home never gets to the desired temperature you set on your thermostat, especially if you have it always running.

Your furnace isn’t functioning properly
If you’ve decided that none of the above are possible reasons, then it could, unfortunately, come down to the efficiency of your furnace. Old and outdated furnaces lose their power after quite some time, and if you don’t have regular maintenance on your furnace, its lifespan could be much shorter.

How to keep your heating bill low
Lowering your heating bill is much simpler than you’d expect. Here are the steps you can take to reduce the overall energy consumption in your home.

Lower your temperature
This sounds counterproductive in the cold, but in all reality, you will likely not notice a drop in a few degrees. Yet, the minor adjustment could save up to 10% of your heating cost.

Use a programmable thermostat
Regular thermostats cycle at every hour of the day, which means it can run when you’re asleep or not home. This is not very efficient. Programmable thermostats, however, can be set to your daily routines. If you’re not home, you can adjust it so your heater isn’t running and wasting energy. This can reduce the cost of your heating bill significantly.

Wear more layers
You can stay cozy and warm but bundling up indoors. While you have your thermostat set to a lower temperature, doing more laundry won’t have as much as a consequence on your bill. Find a cozy sweatshirt, or cuddle with your favorite blanket. These are great ways to keep yourself warm in your home, while still having a comfortable room temperature.

Have your furnace inspected
If you are actively implementing these steps, and are finding no solace, then it might be time to have your furnace inspected. You should have your furnace looked at yearly to ensure everything is in working condition. A professional HVAC company can do a quick checkup to make sure everything is functioning as it should.

Oversized HVAC Systems and Design Temperatures

In recent years, there has been a shift away from oversize HVAC systems that are simply too much for the space they need to heat and cool. This is because more emphasis in building and energy codes is towards energy efficiency. Buildings are required to have more accurate cooling and heating load calculations to prevent the problems associated with oversized systems. These problems can include short cycles and poor dehumidification, among other things. However, sometimes systems are still not sized correctly.

Things Are Heating Up

One of the problems that lead to oversized HVAC systems is that the installer used the incorrect design temperatures when making their load calculation. Here is how that happens. In the winter, heat bleeds from the building to the outside. In the summer, the building absorbs heat. How much heat is gained or lost, and how fast it heats or cools, is dependant on the difference in temperature from the outside to the inside. There is a table that provides the industry standard for the proper design temperatures for each season. However, too many contractors ignore or tweak those recommended temperatures when they are making their calculations.

Temperatures are always in flux, whether inside or outside a building. How much heat a building games or loses is in flux as well, even from hour to hour and day to day. If the goal is to keep the temperature of a building at a constant, such as 72 degrees, then the difference in temperature from outside and inside will be less in the evening and morning during the summer when it is cooler. When the temperature difference goes up, then the cooling load will have to rise as well. In most cases, buildings have air conditioners that are not designed to change the amount of cooling based on the change in temperature. THis would require split heat pumps, which are not common.

Design Temperatures

This is where design temperatures come in. Since most HVAC equipment is fixed capacity, and not variable, the design temperature will help make sure your system is operating at its best. The question is, what do these temperatures represent? In Winter, the 99% temperature refers to the level that the outdoor temperature will be above for 99% of the time. This is based on a 30-year average. This means that in the climate in which the building is located, the temperature will only be below that point for 1 % of the time. For example, in hotter cites, the 99% winter design temperature may be 25 degrees or so.

In the summer, the 1% design temperature is the point that your climate will be above for just 1% of the time. In a hot place, that point could be in the 80’s, for example. In the past, there used to be 97.5  and 2.5% temperatures. Those are no longer used since the current design temperatures have become the new standard.

Contactors and Design Temperatures

In general, contractors do not like having to return to the scene of a job to adjust things if the customer complains about being uncomfortable. This is why they will install oversized systems to make sure there is always enough cooling and heating. They do not know how about the other factors that come into play with the temperature of a building, such as insulation and infiltration. Despite this, if you are having a new system installed, make sure that the contractor uses the correct design temperatures so that you will not only be comfortable, but you can avoid any issues with having an oversized system for the space that you have.

Las Vegas HVAC Convention Sets New Bar For HVAC Industry Conventions

The inaugural Service World Convention 2016 was just held at the end of October at the Tropicana Hotel in Las Vegas. The event was presented by Service Nation Inc. and BNP Media, who wanted to do something beyond a traditional seminar. As a result, Service World Convention provided one of the most impressive lineups of keynote speakers, educational seminars, and face-to-face networking opportunities many attendees had ever seen. Consequently, more than 700 HVAC, plumbing, and electrical contractors attended the event from all over the country. CEO Matt Michael commented on the turnout: “If Service World is this good right out of the chute, imagine how much better it will be in 2017. Every contractor owes it to their business to attend Service World every year.” But what was it that made the Las Vegas HVAC convention so successful?

Las Vegas HVAC Convention – Service World 2016

Renowned Industry Leaders

Event organizers recruited an impressive lineup of industry leaders to speak at the convention. Hudson Inc. CEO Adam Hudson and “Blue Collar Coach” Kenny Chapman were among the keynote speakers. In addition, former race-car driver turned motivational speaker, Derek Daly, gave a heartfelt appeal to all HVAC contractors in attendance. “The greatest power we all possess is the power to choose,” he said. “You must make a choice to step closer to extraordinary because, if you do, it doesn’t matter what your competition does.”

Training Seminars

Training and educational seminars were provided in four categories, or “lanes”. These included leadership, sales, business development, and marketing. Todd Liles, founder of Service Excellent Training, provided an in-depth panel on hiring millennials. The presentation was titled Killing the Professional: How to Create a Sustainable Team Member. During his speech, he spoke of the importance of the hiring process and of hiring millennials. “Millennials think differently than older generations. Is it bad? No, but it’s different,” he said. “Millennials are not the future, they’re our now. We have to be flexible and willing to do what it takes to find the help we need.”

A Great Success

Service World Convention 2016 drew more than 700 attendees, all made up of HVAC, plumbing, and electrical contractors. Organizers are already beginning to plan next year’s convention, as a result of the enormous success of the Las Vegas HVAC convention. The 2017 Service World Convention is set to take place at Mandalay Bay in Las Vegas.

Higher Energy Bills Expected With Longer Winter ’16-’17 Season

Americans living from the east coast to the central plains should prepare for a long winter this year. Information released by ACCUWeather and the US Energy Information Administration (EIA) indicate we will have the coldest winter in years. By contrast, the southern portion of the country can expect a warmer and drier winter for 2016-2017. In addition, the National Oceanic and Atmospheric Administration (NOAA) expects temperatures to be much colder than last winter. With the temperatures expected to be the lowest since 2010, HVAC contractors are making sure people’s heating systems are ready. Whether you use gas, electricity, or oil, higher energy bills expected with longer winter weather are still hard on your checkbook. But just exactly how much can you expect to pay?

Higher Energy Bills Expected with Longer Winter

Temperature Differences

The NOAA expects temperatures that are 17% lower than last year in the midwest and northeast regions. In addition, the South can expect temperatures to be up to 18% colder. The West, however, will likely see temperatures 2% warmer on average than last winter. Says ACCUWeather meteorologist Evan Duffey, “This warmth will come to an end in January, which could be a big month for HVAC contractors as the jet stream changes and cold air spills into the eastern two-thirds of the nation. This even includes Florida, where we are concerned for a freeze this year, which is a very rare event for the Florida Peninsula.”

Higher Energy Costs

With the longer, colder winter expected this year, households and business spaces heated by natural gas are expected to reach $10.37 per thousand cubic feet (Mcf). That’s 11% higher than last winter, and the highest gas prices since the 2010-2011 winter season. In addition, homeowners using heating oil to heat their homes can expect to spend an average of 38% more this winter than last year. Electric heating will also increase by an average of 5% this winter.

Be Prepared

Don’t let the winter chill sneak up on you this year. Prepare your home and business for the colder weather now. Corporate Mechanical can help winterize your HVAC system. Call us today and ask about an inspection and winter HVAC services. With higher energy bills expected with longer winter weather this year, you’ll be doing yourself a big favor. Call today!

What’s the Difference Between Commercial and Residential HVAC?

Residential and commercial HVACs provide the same purpose for their respective buildings, however, the systems are vastly different from one another. Here are the biggest differences between the two.

Commercial HVAC is Larger

The biggest difference is the size. Residential HVAC systems are much smaller than that of commercial sites. Commercials systems also operate differently, as they have different components, such as compressor, evaporates, condenser fans, and thermostats. Residential units rely on less power to operate, as there are likely less people coming in and out of a residential home.

They Both Have Different Locations

In residential homes, the HVAC system is usually in the backyard or along the side of the house. Commercial units, however, tend to be located in a “swamp cooler” or on a building’s roof. Putting a commercial HVAC system on the roof is a great solution to saving space. This also helps with prevent noise pollution, due to the HVAC system’s ability to generate loud noise.

Commercial HVAC are Much More Complex

Due to the sheer size difference between the two, the structure is much different. Commercial systems require more adaptability, due to each and every business’s unique building structure. They also typically serve many more people than residential ones do. The drainage system is one of the most notable differences. In commercial HVAC systems, multiple pans and pipes are used to ensure the drainage is completely evaporated.

Commercial HVAC Has a Higher Maintenance Cost

The maintenance cost of a commercial HVAC system is much more than single residential units. This is due to all of the differences listed above, such as size and complexity. Commercial HVAC systems require highly skilled technicians to work on, as they also need to be professionally installed. You should never attempt to repair an HVAC system yourself.

Both residential and commercial HVAC systems serve the same purpose, however they are completely different machines.To ensure that your HVAC system (commercial or residential) is performing its best, make sure you are always getting routine checkups.

‘Green Ductwork’ Gaining Popularity As Industry Standards Improve

We live in an eco-friendly world. Politics, science, business, public safety. Evidently nothing has been left behind when it comes to going green. Hence a new trend that’s making waves in the HVAC industry. ‘Green ductwork’ is a new term that more and more HVAC professionals are becoming familiar with. While there is no finite definition to the new term, most everyone associates it with recycled materials related to ductwork and other HVAC materials. New standards set by the U.S. Green Building Council’s LEED (Leadership in Energy and Environmental Design) program are continuing to drive improvements in green materials and improved awareness of public health and environmental concerns.

Green Ductwork

Eco-Friendly Materials

According to LEED’s page on the U.S. Green Building Council’s website, “LEED-certified buildings are resource efficient. They use less water and energy and reduce greenhouse gas emissions.” As a result, new HVAC equipment is being developed from recycled materials that have a lesser impact on the environment. Polyester, for example, is being used to make fabric ductwork. Fabric ductwork is lighter than traditional metal. It requires less roof or tether support and uses linear dispersion to eliminate hot and cold spots. These advances make more efficient HVAC systems that are also simpler to install and create less solid waste.

Cleaner Air

A major component of green ductwork is its ability to remove contaminants from the air. One of the biggest pushes for more eco-friendly building materials is public health. Consumers are more aware of volatile organic compounds (VOCs) present in various products. Most HVAC systems are lined with insulation for noise reduction. Consequently insulation in building ductwork puts contaminants and other particles into the airways and makes people sick.

Increased Efficiency

Increasing HVAC efficiency is another major part of ‘green ductwork’. Leakage in ductwork forces the system to use more energy. Consequently you end up with higher energy expenses and decreased efficiency. HVAC contractors are currently looking for the most cost-effective way to improve ductwork efficiency. Some apply gasket fittings while others go back in and seal the system with a commercial-grade sealant. Sealants effectively limit energy use and minimize emissions. Consequently you spend less and do more for the environment.

Industry standards are cracking down on faulty HVAC equipment. Consumers continue to look for more eco-friendly products to use in their commercial space. Don’t be left behind. Contact the professionals at Corporate Mechanical today. We are up-to-speed on all the current industry trends. Our representatives are ready to answer your questions and offer you real solutions. Call us today to schedule a consultation and go green with ‘green ductwork’.

This article is based on a news article appearing on archrnews.com. You can read the full article here.

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