Author: dpadmin

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.

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.

You may think that your heating, ventilating, and air conditioning (HVAC) system does not need regular maintenance, but you would be wrong, even if it is a brand new system. The fact is, not only can your system fail if it is not properly maintained, but the health of the occupants of the building can suffer as well. Besides, HVAC systems are an expensive investment, and there is no reason why you should not protect that investment with regular maintenance. Here are some steps to take when maintaining your system.

Filters

Changing the filters regularly may be the single best way to prevent illness and poor air quality. It helps prevent water from pooling and collecting mold and bacteria. Filters are rated using a system called MERV. The higher the rating, the more effective the filter. A clear filter allows the system to more easily cycle air through. If it is clogged, then it will spend more energy pushing air through the system, plus that air will be contaminated by the nasties stuck in the filter.

Do Not Allow Pooling Water

The air conditioner intake is a prime spot for water to collect, creating a breeding ground for bacteria. Cleaning back the tree line and keeping the roof clear will help keep debris and dirt from getting into the unit. The drain lines that carry condensation away from the unit should also be kept clear and free flowing.

Evaporator and Condenser Coil Cleaning

Evaporator coils collect moisture, which promotes the growth of mold. Air coming into the building passes over those coils as well, meaning contaminated air gets spread throughout the building. Coils should be cleaned using and antimicrobial cleaner. Ultraviolet lights may also be effective in preventing mold. However, most HVAC systems do not come with ultraviolet lights, so they would have to be installed afterwards, potentially using a separate power source.

The best thing for your HVAC system is to keep it running at its best at all times. That means even if it is a brand new system, maintaining it regularly and keeping it clean. This will make sure that the air in the building is not causing illness, and also ensure that the system is running as efficiently as possible.

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

HVAC Innovation

Researchers are looking into a new way to improve the air quality and energy efficiency of heating, ventilation, and air conditioning (HVAC) systems. A team from Penn State University have been testing whether ultraviolet germicidal irradiation (UVGI) would work to help maintain cooling coils and keep them clean.

The team went about testing the air flow, humidity, and pressure drop before and after cleaning the cooling coils with UVGI. They will then use that data to measure what the benefits would be of using it.

HVAC Operations

When an HVAC system is running, microorganisms collect on the coils that transfer heat throughout the system. These fungi and bacteria, along with other materials, can build up to a point that affect the performance of the system as a whole. More energy is used to make up for the gap in performance. Not only that, but the microorganisms are also spread into the building. The condensation that forms on heat transfer coils are what make them particularly susceptible to contamination.

What to Do

There are a few current options for cleaning the coils. They include mechanical and chemical methods. UVGI is also currently used, but because there is very little research about its effectiveness, it is not common. UVGI is a common disinfectant for other applications, but there are concerns not just about the effectiveness for HVAC systems, but also whether it negatively affects air quality. This new research is meant to make determinations on these questions.

The project is currently operating at two test sites. Not only will they be collecting immediate data, but they will also collect data over time to see if the results hold up in the long term. That way, they can see if UVGI continues to be safe and effective after several uses.

The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) have been working to “maximize the actual operational energy performance of buildings and facilities,” and this research coincides with that effort. The hope is that UVGI will prove to be a safe and effective cleaner for HVAC systems, and can be used more widely.

There is a movement across all industries and sectors to be more energy efficient and safer in all things. HVAC systems will continue to improve in both factors through research like this.

If you have any needs for commercial HVAC services, Corporate Mechanical can help. Reach out online or call us at 763-533-3070

At times of great devastation, it’s important for communities and countries to come together to help those in need. Johnson Controls is doing just that by offering discounts to homeowners in Texas who have been affected by Hurricane Harvey. To qualify, residents must live within the designated disaster area as defined by FEMA. The rebates can be used towards the replacement of air-conditioning, heating, and ventilation equipment.

Which Products Qualify?

There are several products that qualify for the rebate, with ones that provide the best Seasonal Energy Efficiency Ratio (SEER) offering the best rebates. The more efficient the product, the better. Certain products from Champion, Fraser, Cole, Luxaire, Johnston, Guardian, and Evcon qualify. For air conditioners, if they have a SEER of 20, there is a $250 rebate. It’s $200 for an 18 rating, $150 for 16/17, and $100 for 14. For furnaces, there is a $150 rebate for 90% AFUE models, and $75 for 80% AFUE.

How To Apply

To apply for the rebate, homeowners or Johnson Controls employees can visit johnsoncontrols.com/harvey, or call (855)324-3650. The rebates cannot be used with other rebate offers, but fortunately they can apply retroactively. At the same website, homeowners will find a locater to find certified dealers in their area to make sure that they have a trusted source for their new equipment.

Other Initiatives

Johnson Controls also encourages everyone to donate to the Red Cross to help the recovery effort. The company already donates $500,000 every year to the charity, but have a spot on the site to donate. They’ve also set up a Harvey Relief Fund for employees who have fallen victim to the hurricane. Johnson Controls will match all donations to the fund as well. They have also created a team within the company to help with a strategy to meet the needs of affected employees.

Johnson Controls has stated that its prime concern is with the health and the needs of its employees. With the rebate initiative, and the relief fund for employees, they are showing that everyone must come together to help when disaster strikes.

We live in a world where we are becoming more connected all the time. We can contact whoever we want from a device we keep in our pocket, and access any information we need using that same device. Our homes are no different. More and more products are coming to the marketplace to help us be connected to, and automate, our home lives like never before. Should HVAC contractors be selling these products along with traditional ones, or leave that to the larger companies and big box stores?

Fringe Items

“Fringe items” is the new buzz term for items that will help connect several aspects of your home. They include locks, sprinkler systems, and lighting systems, for example. For heating and cooling, there are many new options on the scene that contractors can potentially offer to their clients. However, the HVAC industry as a whole has not embraced this new technology in the same way that other industries have. It may be time for contractors to start training both themselves and their staff on new technologies, so they can start seeing the benefits. Once they see the benefits, they will be able to more effectively sell those products and services to their customers and improve their lives.

How it Could Be Successful

It seems that for many contractors, it is all or nothing. They have either embraced home automation, or ignored it completely. The latter group may end up being squeezed out. Selling fringe items means getting to know your clients, and finding out what their needs are. The best thing about new options and technologies is that there is more of an ability to customize, so there’s no reason a client canot get what they want. HVAC contractors are in a unique position when compared to contractors from other industries who are in the home automation game. They often already have paid memberships, and they visit clients’ homes several times a year in some cases. With that relationship comes trust.

Since the world is getting more connected, there’s no reason that the HVAC industry should not embrace the changes. Making clients’ lives easier and providing them with the service should be the primary goal.