Why Should Your Company Install an Energy Recovery Unit?

Energy Recovery UnitDesigned to recover up to 80% of the energy expended, an energy recovery unit is an ideal way to make your company’s monthly expenses lower.  It can be used as a standalone module or can be attached directly to the rooftop, thus allowing it to accommodate more outdoor air quantities. Even better, when opting for the rooftop installation you can often go with a smaller unit capacity, which means a lower installation price.

The energy recovery units (ERU) are ideal for a long list of industries – some of these include hotels, hospitals, sports halls, office buildings, seminar rooms, swimming pools, paint spray booths and many others. At MJC, we offer several types of energy recovery units, so there is certain to be one that fits your unique needs and building design. Below is a list of our ERU types and a brief description:

·      Fixed Plate ERUs – Designed with no moving parts, compact, outstanding corrosion resistance, compatibility with high temperatures applications, the fixed plate design is often the best choice in ERUs for a company.

·      Sensible Plate Energy Recovery – Known for trouble free operation, reduced noise and minimal maintenance, lightweight, compact design, no moving parts, separate air streams and no cross contamination.

·      Enthalpy Plate Energy Recovery – Like the others, the Enthalpy Plate Energy Recovery boasts no moving parts, minimal maintenance costs and reduced noise.

·      Energy Recovery Wheels – Designed to recover sensible and latent energy, it will not promote the growth of mold or bacteria, has increased fire protection and is easy to maintain.

But if you are on uncertain about whether or not an ERU is needed for your business, then consider these additional benefits in having one added to your location.

1.     Fresh air – During the winter, the air can get rather stale as doors and windows are not opened as often. An energy recovery unit will circulate the air keeping it fresher and more breathable.

2.     Healthier employees – As a business owner, you depend on your employees to help you succeed. If they are out sick; the work production is affected. By swapping out the air, you are ridding your place of business of germs and bacteria which creates a healthier environment and lowers risk of winter colds being circulated throughout the office.

3.     Save money – The biggest benefit is the money saved. An ERU eases the strain on your HVAC system so it doesn’t have to work as hard, thus extending the life of the unit. In fact, studies show that energy bills drop by as much as 40% when an ERU is in use.

An energy recovery unit is a must for any commercial space. It combines energy efficiency with ease of maintenance, better health and lower costs to make it a wise decision. If you have questions about how an ERU can benefit your space, give one of our MJC, INC. specialists a call today.

How Much Do You Know About Commercial HVAC Coatings?

Architectural CoatingsDid you know that corrosion in commercial HVAC units is responsible for 40% of the equipment failures? And, should your business have a seaside location and not have the HVAC unit properly protected then the operating performance of unprotected condenser coils may decrease over 50% in a single year!  This deterioration may happen over time and not be discovered for as many as four years or it can happen in just months and can require that the entire system be replaced – definitely not a budget friendly activity!

Types of HVAC Corrosion

The corrosion is generally manifested in one of two ways – pitting or formicary – and neither of them are something you want to hear mentioned. Pitting is typically caused by the coil being exposed to fluoride or chloride while formicary corrosion is due to exposure to acids such as those found in cleaning solvents, insulation, adhesives, paints and many other materials. Formicary corrosion can be more subtle and take a bit longer to be discovered, while pitting usually moves quickly and will form holes that cause the coils to leak refrigerant.

As neither of these situations is desired, it is important that you have a coating added to your commercial HVAC unit. At MJC, we offer 3 types of coatings: anti-microbial, anti-corrosive, and architectural coatings.

Anti-Corrosive HVAC Coatings

This is an epoxy based primer with a urethane UV protective top coat. It is applied to the tube sheet (aka, coil surface) the headers and the refrigeration circuits. This process exceeds industry standards, and is perfect for providing corrosion protection in both salt air or chemical environments.

Anti-Microbial HVAC Coatings

Like our anti-corrosive coating, this is coating goes above and beyond industry standards; it is designed to protect your commercial HVAC unit against corrosion, but it goes a step further, and works as a preventative against bio growth on painted surfaces. Also noteworthy, the coating has a miniscule effect on the heat transference of the coil or the pressure drop through the coil.

Architectural HVAC Coatings

No matter the needs of your commercial HVAC unit, we have a coating to protect it. Regardless of the type of unit you have, we can design a coating that matches your building. In fact, we have matched our architectural coating colors to rooftops, company colors and even industry safety colors. We use the highest quality coatings, which are designed to resist abrasion, chemicals, marring, chipping, and scratching.

You don’t want to make the investment of a state of the art HVAC system only to have it need to be repaired due to corrosion. No matter where your business is located, it is vital that your HVAC unit have the proper coating. Talk to us today to determine which type of HVAC coating is best for your space. 

6 Tips for Selecting a Commercial HVAC System

MJC Inc Energy WheelsIf you are building a new business location, or perhaps considering upgrades for an existing one, chances are, you will need to think about the type of commercial HVAC system to install. After all, you want to keep on budget, not just in the purchase and installation phase, but also in the future as you pay energy costs each month.  But what should you look for in selecting an HVAC system? After all, that is not something that most of us have a great deal of experience in!

6 Tips for Selecting a Commercial HVAC System

As you begin the search for the HVAC system perfect for your business, don’t hesitate to ask questions. Talk to several HVAC specialists, visit other companies and find out what they have and why, and then make an informed decision. As you do your due diligence, the following tips will help.

·         Efficiency – As with any business investment, cost will always be a determining factor. But remember, that it is not the only factor. Perhaps one of the most important things to look at is the efficiency of a particular brand or type of HVAC system. Be sure that a particular unit or style will not just heat and cool, but do so in a way that works with the design and usage of your space.

·         Reliability – It isn’t truly saving you time and money if the system chosen requires frequent updates, repairs, and cleanings. Select a system noted for its reliability and minimum maintenance needs. A good way to learn how dependable a system is will be talk to others who have the same set up.

·         Size – Bigger is not always better. You don’t need a system that is larger than necessary as it will actually cost more and be less efficient. Be sure that your company’s HVAC system is the right size for the number of people who will be in your building as well as the square footage of your facility.

·         Specifications -When asking for a quote on an HVAC system, be sure to ask for one based on specifications for a standard efficiency system as well as a high efficiency system including life cycles. Typically, if the lifecycle cost is less on the high-efficiency unit, this will be the system to purchase.

·         Recycling –To minimize wasted energy, consider having a system that recycles the exhaust air stream and turns it into incoming fresh air.

·         Building Type –Areas such as warehouses and garages often do best with a radiant heating system while facilities that do onsite cooking or have heavy equipment in use do well to have a heat recovery system as a way to capture “wasted” heat and use it to offset facility heating and cooling costs.

Choosing the right commercial HVAC system for your business location doesn’t have to be stressful. Use these tips and talk to an MJC HVAC specialist to learn what type of design and system will best work for your location. We are here to listen to your needs and help you decide. Give us a call today.

The Benefits of Having a Custom HVAC System

MJC Inc Energy Recovery UnitsWhen you find yourself in the process of building your dream business location, you are faced with many decisions. From the type of fire suppression system to office furniture and everything in between, you have to make dozens of choices. One of these decisions will likely include choosing an HVAC system. And, while there are a number of wonderful commercial HVAC systems available, why not have a system designed to meet your needs and location?

With new construction, you can make choices that will benefit you – not some other company. Here are some of the reasons why companies ask MJC to develop a custom comfort system:

· We have a variety of high-tech equipment that incorporates many options. From the types of coatings used to the design of fans or ductwork, you can have an energy efficient solution. (Of course, if the HVAC unit is already in place, we can modify a non-MJC unit to meet your needs.)
· You can choose between split systems, or systems where the HVAC unit is installed on the ground outside your location or on the roof. You may even opt for a combination of these based on your needs for a specific space.
· Having an HVAC system that is too large for your space is just as bad as one that is too small. By having a custom unit designed, you can ensure that it is just what you need, thus making it more energy and cost effective.
· With a custom system designed and installed by MJC, you can count on the ductwork being placed where you need it for maximum balanced air delivery. This significantly minimizes the risks of improper installation, leaks, and loose connections.
· With a custom design, you can install the pieces needed to provide you with clean and healthy air. From the types of filters used to ventilation, you can be certain that you and your team have the best air quality possible.
· Because the system is designed just for your space, it doesn’t have to mean it will break the budget! Typically, custom-built HVAC units will cost less, and save you more because it is designed to meet your needs, rather reconfiguring another company’s ideas of what your HVAC system should have.

From comfort to cost, having an HVAC system that works for you is not something to overlook. At MJC, we can create an HVAC system that is perfect for you, so that you pay for what you actually need, not what a company thinks you need. Give us a call today to get started on the planning and installation of the HVC system right for you.

5 Fall Maintenance Tips for Your Commercial HVAC Unit

hvac-tipsFall is officially here and with it comes cooler temperatures. And while many of us embrace the cool after the hot weather of a Georgia summer, these lower temps are a reminder to prepare for the colder days ahead. This preparation can take on many aspects, but one job that should not be overlooked is ensuring that your commercial HVAC unit(s) is ready for winter. After all, you don’t want to lose holiday business because your space is too cold to spend time in!

5 Fall Maintenance Tips for Your Commercial HVAC Unit

Performing basic HVAC maintenance tasks is about more than just minimizing problems. It is a way to reduce energy costs for your company. By installing a programmable thermostat, ensuring that your system is designed to benefit your business, and by making upgrades when needed, you can make HVAC maintenance a smaller portion of your responsibilities.

Basic Commercial HVAC Maintenance Practices
· Should you have a system that uses filters, be sure to change these according to the instructions. This will improve the system’s performance, efficiency, and lifetime. Studies show that nearly 30% of electricity used in a typical commercial space comes from the HVAC unit. By keeping it clean, it doesn’t need to work as hard, so energy costs are lower.
· Do planned maintenance checks on the various pieces of equipment to be sure that your warranty stays current. Many HVAC companies will not honor a warranty if the piece has not been properly checked or updated as needed. Consider creating an HVAC maintenance schedule to ensure that each element of the system is checked when it should be.
· Be sure that your HVAC unit’s thermostat is properly calibrated so that you can set it for a specific temperature.
· Check around ductwork, vents, windows, and doors to make sure that no air is escaping. Should you find any leaks, have them sealed asap.
· Check elements such as heat exchangers, any tubes or other orifices where debris can build up and prohibit efficiency.

These maintenance tips for your commercial HVAC unit are not difficult, or lengthy to do, but failing to do them can have significantly adverse effects. Take time now to check out your company’s HVAC units. If you feel as though your older commercial system is not working as needed, or that you are spending more than necessary trying to maintain your existing system, consider having a custom commercial HVAC system designed by MJC.

For questions about the state of your HVAC unit, or to get an expert’s advice, give the MJC team a call today. We can check out your system, provide tips for getting more from it, or even custom design an HVAC system that meets your needs. Don’t wait to see “if” something will happen. Be proactive, and prevent HVAC problems before they can occur.

Saving Money with the MJC Air to Air Plate Energy Recovery Unit

mjc air 2 air 2When it comes to one’s working environment it is important that it be the best it can possibly be. This is often done through providing the appropriate workspace, the tools needed and most importantly, ensuring that comfort levels meets industry standards. Consequently, the HVAC system that you use needs to meet a variety of standards. The MJC Air to Air Plate Energy Recovery unit is designed to meet and exceed the industry standards, thus guaranteeing that you and those with you work are best able to perform their jobs.

 

The Benefits of the MJC Air to Air Plate Energy Recovery Unit

Energy Recovery
For comfort, health, and safety, places where people work require adequate ventilation. However, ventilation air is very expensive to condition from an energy standpoint. When outside air for ventilation is brought into a building or a space, all, or most of it, has to be exhausted to prevent pressure build up inside the building. The building owner or tenant has already paid to heat or cool the air that’s being exhausted, so a great deal of money is spent on energy costs. As such, it is vital that business owners or property managers look for ways to save money through energy recovery.mjc air 2 air 3

Energy Savings
As we know, ventilation air is very expensive to heat, cool, and dehumidify. Re-circulated air that returns to the unit from the conditioned space is typically 75 F and 50% relative humidity. To cool and dehumidify the air, the air conditioning unit cools it from 75 F down to 55 F and removes moisture at the same time.

Ventilation air brought in from the outside on a hot summer day can be from 92 F to 105 F or higher if the building is located in the desert southwest. It takes a lot more energy to cool air from 92 or 95 F to 55 F and that’s why energy recovery makes so much sense.

Energy recovered by the MJC Air to Air Plate Energy Recovery Unit is used to cool down the incoming air from 95 F to around 81 or 82 F in most applications, which reduces the work the air conditioner has to do, thus saving utility costs. These units work the same way for wintertime heating by recovering heat and moisture from the air being exhausted and adding it to the incoming ventilation air.

Moisture & Comfort
Much of the discomfort we feel indoors, comes from having too much or too little moisture in the air. The MJC Air to Air Plate Energy Recovery unit removes moisture from the incoming air in the summer and adds moisture to the incoming air in the winter; saving energy and making the occupants feel more comfortable.

Lower Maintenance Cost
At the heart of the MJC unit is an air-to-air plate heat exchanger. Unlike “wheel” type units, the air-to-air plate heat exchanger has no bearings, belt, gears, or motor and under normal use can be cleaned with a shop vacuum.

mjc air 2air 1Unit Construction
· Base – 18 Ga welded galvanized profile suitable for curb mounting
· Corners and structural posts – 18 Ga. galvanized sheet metal
· Panels are single wall construction – 18 Ga. galvanized sheet metal (foil face rigid insulation or fiberglass blanket)
· Access doors are located to provide easy access to fans, motors, filters, core, and controls

The MJC Air to Air Plate Energy Recovery unit is an important part of keeping your company moving forward. After all, when everyone is comfortable and breathing the cleanest air possible while saving you money and time, you are sure to be a success. If you have questions regarding how the MJC Air to Air Plate Energy Recovery unit can improve your workspace, talk to one of the pros at MJC. We would love to help you!

Evergreen ECO Technology: How Evergreen UVC increases AHU Energy Efficiency

MJC is an approved factory installer of Evergreen UVlights. MJC provides and installs UV lights in your Air Handlers and Packaged Equipment!

au energy efficency

Problem:

Facility managers struggle with maintaining HVAC units. Coil cleaning is often one of the most neglected maintenance requirements. To truly keep coils clean and performing to original specifications, coils may need to be cleaned 4 times per year (quarterly)– which is expensive, labor and chemical intensive… and unrealistic.

Solution:

EVERGREEN UV Coil Optimization Technology (ECO-­‐UV) is specifically engineered for the ideal treatment of coils, engineered sand scaled specifically for the coil’s exact height, width, and CFM of the HVAC system.

Background:

Biofilm naturally accumulates on all cooling coil fins, reducing thermal energy transfer and air volume, while increasing static pressure and air speed (less contact time with cooling fins); Biofilm also serves as the ‘glue’ that attracts and holds particulates that bypass filtration, causing coil fouling and efficiencies to decline rapidly. Biofilm causes all AHU components to work harder, including chiller plants and fan motors.

ASHRAE states: “Damp coil and drain pan conditions are excellent forums for growth of bacteria and mold (biofilm). Coil fouling caused by growth of bacteria and mold increases coil pressure drop and reduces airflow, reducing heat transfer from coil fins to lessen the amount of work a system can perform”.  

 ASHRAE Handbook, Chapter 16, 2008; Chapter 60, 2011 & 2015. Facility managers are often forced to compensate for cooling capacity loss by reducing chilled water temperature, increasing fan speeds, lowering thermostats, and adjusting setbacks; reactive efforts that greatly contribute to increased energy consumption.

The ECO Solution (Environmental Coil Optimization)

“UVC can be readily applied to HVAC systems to keep coils, drain pans, and other surfaces clean and free of microbial contamination. UVC maintains heat exchange efficiency, design airflow, and improves indoor air quality by reducing bacteria and mold growth on system components.” “Coil pressure drop is reduced and, therefore, airflow is restored. Because heat transfer also is restored, this combination can result in significant energy savings, with payback of possibly less than 2 years.” ASHRAE Handbook, 2008, 2011, 2015  

Environmental Coil Optimization destroys the insulating biofilm to ‘release’ dirt and debris that contribute to coil fouling. Coil optimization returns the AHU to as-­new specification to help achieve the benefits listed by ASHRAE, while providing substantial and immediate energy efficiency that results in rapid ROI payback.

AHU Benefits:  

  1. Kills all mold and biological growth on coil fins, drain pan, fan motor and surrounding plenum. And… odors are eliminated!
  2. Bio-­‐free coils generate greater condensate volume and lower Relative Humidity  (RH%) in the facility. Increased condensate properly removes debris as originally specified = cleaner coils and cleaner pans.
  3. Delta-­‐T and thermal efficiency restoration, static pressure reduction,  improved air flow, reduced fan amperage draw = return to as-­ built specifications.
  4. Energy savings = 8% to 20% / energy ROI = 1 to 4 years.
  5. Keeps coils clean 24/7/365

Maintenance Benefits:

  1. Eliminates need for chemical coil cleaning = labor and chemical savings.
  2. Eliminates need for pan pills or odor pills in pans or plenums.
  3. More Efficient system = fewer service issues.
  4. Lifecycle of AHU extended by ~ two years.

 

Lumalier Environmental Disinfection Products by Evergreen UV LLC 1931 Thomas Road, Memphis, TN 38134 901-­800-­1709 

What is the Air Turnover Unit and How Does it Help?

air turnabout 2At MJC, we are always looking for ways to make heating and cooling easier, and more effective. We work hard to ensure that every piece of equipment offered goes above and beyond the industry requirements so that you get the best service possible. It is with that goal in mind that we offer the MJC Air Turnover Unit.

Never heard of an Air Turnover unit? Then allow us to explain it to you. An Air Turnover unit is a large air handler, used to supply and return large quantities of air without ductwork. The process is simple – a mass of air is discharged at or near the top of the space and the same quantity of air is returned from floor level. The air mass exchange results in a turnover of space volume. This design gamf.net makes heating and cooling large spaces more effective and efficient for spaces such as warehouses, manufacturing facilities, super mario distribution centers, and indoor sports training facilities.

The ideal application is to use fewer, larger units for both heating and cooling applications. Doing so results in the following benefits:

As compared to unit heaters an air turnabout unit uses:
· Less natural gas, hot water or steam piping
· Fewer electrical circuits
· Fewer vents and roof penetrations for gas fired heating
· Less labor

As compared to conventional heating and cooling systems the air turnabout:
· Fewer units
· Fewer electrical circuits
· Less natural gas, hot water or steam piping
· Fewer roof penetrations
· No ductwork
· Fewer condensate drains

Energy Savings from an Air Turnover Unit

The primary energy savings from an Air Turnover unit is from fan brake horsepower. Conventional Roof Top units use forward curved fans and Air Turnover normally uses airfoil prop fans. Since an Air Turnover unit is not ducted, there is less overall static and less fan horsepower is needed.

· FC fan operating at 2.00” TSP = 25 HP
· Airfoil prop fan operating at 1.2” TSP = 15 HP
· 40% Reduction in fan HP.

Why Use MJC Air Turnover Units?turnabout 3

There are a number of air turnover unit manufacturers and they fall into two distinct categories – they either make a top of the line unit or they make a price driven unit. Because we are a custom manufacturer, we are able to build to our customer’s needs. In addition, we are able to provide both product lines – high end and price driven.

MJC’s Standard ATO Product Line Consist of
· Belt Driven Prop Fans
· No Controls
· Stamped Diffusers
· Galvanized Coated Drain pans
· No-Exterior Coating

MJC Custom ATO Product Line Consist of
· Direct Drive Prop Fans or any fans needed
· Full DDC Controls
· Airfoil Adjustable diffusers
· Triple sloped stainless steel drain pans
· Custom Color Exterior
· Armaflex insulation

So, don’t spend excess money when you don’t have to. Our Air Turnover unit is the perfect solution to your large space heating and cooling needs. Give us a call today to learn how an air turnover system can improve your locations heating and cooling needs.

Introducing the Convergence VRFmz System – The Latest in the MJC Family

CONVERGENCEBy definition convergence is the merging of thoughts and ideas to create a stronger idea, product, or service. This is no less true in the world of HVAC. It is with in mind, that the MJC team worked towards creating a more efficient HVAC system.

We are please to announce success. Recently, MJC released the game-changing CONVERGENCE VRFmz system, the first ever VRF Package Multizone. The Convergence merges the design, form, and function with the variable refrigerant flow gamf.net technology so that a more efficient unit can be installed – regardless of whether your business uses a roof or pad mounted package unit. The CONVERGENCE system offers advantages, some of which include the following:

What Makes the CONVERGENCE VRFmz System So Special? 

CONVERGENCE VRFmz is not just another HVAC unit. It has been specially designed to be the best in rooftop systems so that you can always be comfortable. In order to do this, we have made an assortment of modifications to the standard HVAC system. Some of these changes and updates include –

  • Capacities to 64 tons
  • VRF Heat recovery system
  • Mode control or Branch selector kit for simultaneous heating and cooing
  • SWSI Plenum supply blower
  • Premium efficient motors
  • Variable speed blowers
  • Independent zone evaporator coils
  • Full Economizer with low leakage
  • Modulating dampers
  • Double wall casing and doors
  • Hinged access doors to blower and filter sections as well as other areas requiring routine maintenance
  • 2” MERV 8 filters in side loading filter rack
  • Electronic expansion valves
  • Formed galvanized base frame
  • Galvanized casing painted to match customer requirements.
  • Individual zone dampers for VAV function, balancing, and zone isolation

Benefits of the CONVERGENCE VRFmz:

  • A first of its kind Patent Pending VRF solution in packaged multi-zone form.
  • Takes advantage of VRF heat recovery system to provide simultaneous heating and cooling to multiple zones.
  • Designed for new construction and retrofit/direct replacement markets.
  • Solves the nagging issue of meeting ASHRAE STD 15 with VRF systems by keeping the refrigerant line sets out of the occupied spaces and ceilings
  • Solves the issue of providing ventilation air with VRF systems by configuring the VRF system as a classic package unit with optional full economizer and energy recovery wheel options
  • Provides higher efficiencies far surpassing traditional package multi-zone solutions and excels during part load conditions, a place where multi-zone equipment operates 40-80% of the time.
  • VRF technology can reduce the energy consumption by as much as 40% a year compared to traditional DX systems.
  • Each zone is equipped with its own coil capable of providing cooling or heating completely independent of all other zones regardless of ambient temperature thanks to the Control units that make up the core of VRF technology

The CONVERGENCE system not only meets today’s HVAC requirements, but goes above and beyond them. It is the ideal approach to keeping a consistent temperature in your building all year around. If you have any questions about how the CONVERGENCE system can benefit you, or what it is involved in the installation, don’t hesitate to contact the MJC team. We are here to help you stay comfortable.

Common HVAC Problems and Solutions

PDDU viewCommercial HVAC units are generally very reliable, but that doesn’t mean they are invincible. When there is a problem with your HVAC system, it can often be a stressful time for you, your employees, and your customers/clients. In the South, where temperatures during the summer can be rather warm the loss of a working HVAC can even cause you to need to shut down or work a restricted schedule.

As HVAC professionals, the MJC Inc. team has seen and repaired many HVAC problems over the years, and has identified some common heating, ventilation and air conditioning problems. While these aren’t the only problems that may be encountered, having a basic knowledge of the problems and what can be done to resolve them can be extremely beneficial. Continue reading