Hiring a HVAC Engineering Contractor in Old Mill Creek

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Searching for the top HVAC Chicago? The one to go to is New York Engineers. Not only for HVAC Engineering in Chicago but also Architectural Engineering and Protection Engineering in or near Old Mill Creek. Contact us at 312 767.6877

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Many construction companies throughout Deer Park, New York already know that NY-Engineers.Com is the engineering company to call if you are looking for Architectural Engineering in NYC. What many local building owners have yet to realized is that NY Engineers is also your top choice if you are looking for HVAC Engineering services in Old Mill Creek, Illinois.

Contracting a HVAC Contractor in Old Mill Creek requires the ability to explore and recognize what’s needed for your construction. Every individual will probably be altered in terms of the signing procedure and it’s best to look at these traits.

1) Knowledge: An effective business will usually have accomplished staff onboard to assist with HVAC needs. They are not only trained but are going to have a number of skill in the trade. This keeps things simple, streamlined, and as efficient as you want them to be. Clients should feel at ease with an authority readily available to assist.

2) Portfolio of work: Have a look at their track record to note just how they’ve done before. It might help shed light on whether the business is a avid team with great results. If there are actually difficulties with their portfolio then It is planning to sort into your create. Concentrate on this without delay!

Those characterize the tips for employing a high-level organization and ensuring the answer is top notch. If not, the company can wind up making more issues than answers. Start with these guidelines and write a short list to have the procedure easier.

That is why most engineers are hired as consultants because they get experience. In those situations, they might be only accountable for the next element in the process and might show understanding on what works or what does not.  Most HVAC systems are established with the help of an Old Mill Creek HVAC design engineer.

Core HVAC Design Engineer Responsibilities

An HVAC design engineer in Old Mill Creek will be granted a selection of different responsibilities dependant upon the business, its needs, and how the assignment grows.

Generally speaking, the HVAC design engineer tasks are likely to include a variety of chores which includes creating various HVAC systems. Every duty is going to be unique since clients come in with modified requests. These bids could incorporate the size of their system, how it’s going to operate, and the performance metrics they are after with a brand new HVAC system.

An experienced Old Mill Creek HVAC engineer will probably sit back, understand these needs, and map out a complete HVAC system with high-quality design devices. Everything is considered within this process and that is what HVAC design engineers are relied on to do. As well as creating the HVAC system, the engineer has to be certain the system is performed properly and fits in step with precisely what the customer needs.

This is why most engineers are employed as consultants since they gain experience. In those situations, they might be only accountable for the following step of the style and can give insight about what works or what does not.  Most HVAC systems are started by using an HVAC design engineer in Old Mill Creek. Even with all of this information you would like more information on the HVAC Engineering services in Old Mill Creek, Illinois by NY Engineers we invite you to visit at our blog.

New CAD to Revit Modeling Related Blog Post

How Construction Engineers are Improving HVAC Efficiency in Commercial Buildings with Variable Frequency Drives

Mechanical Engineers

HVAC systems come in various configurations that differ significantly from each other. For example, an air conditioning system based on packaged rooftop units is drastically different from a chiller plant. However, HVAC installations have a common denominator: they use electric motors that are subject to variable loads. Regardless of whether these motors are used to drive compressors, water pumps or fans, construction engineers understand that there is a great opportunity to save energy by optimizing part-load operation.

In general, running a motor at partial speed is more energy-efficient than running it intermittently at full speed.

  • Intermittent operation only provides linear savings. For example, a cooling tower fan with a duty cycle of 80% consumes 20% less energy than an identical fan operating full-time.
  • Reducing motor speed provides cubic savings.. On the other hand, slowing down a fan to 80% speed reduces energy consumption by nearly 50%. The average airflow is the same as that of a fan running at full power 80% of the time, but savings are boosted significantly thanks to speed control.

Speed control can be accomplished with variable-frequency drives (VFD), and they have a broad range of applications in HVAC systems due to the cyclic nature of loads. It is important to note that VFDs are also known as variable-speed drives (VSD), adjustable-frequency drives (AFD) or adjustable-speed drives (ASD).

Fractional horsepower motors in small-scale HVAC systems can also achieve significant savings with speed control. The main difference here is that electronically commutated motors (ECMs) are more cost-effective than VFDs in these applications.

Ask a Construction Engineering Expert: How Does Variable Frequency Drive Work?

As explained by electrical engineering textbooks, the speed of an electric motor is defined by the power supply frequency and its internal construction. For example, a motor running at 1800 RPM with the 60 Hz USA power supply would run at 1500 RPM in the UK, where the frequency is 50 Hz. Thus, if a motor is suitable for operation at reduced frequency, its speed can be ramped down during part load conditions to achieve energy savings. VFDs are connected between the power supply and the motor, adjusting voltage and frequency as a means of speed control.

In applications where only single-phase power is available, VFDs can be used to integrate three-phase motors while achieving the energy efficiency benefits: there are models capable of producing a three-phase voltage from a single-phase input, while adjusting magnitude and frequency to control motor speed.

In addition to improving energy efficiency, VFDs allow motors to be soft-started by gradually ramping up the voltage and frequency, as opposed to directly applying full voltage at 60 Hz. Electric motors draw from five to eight times their rated current when started directly, and the voltage drop that results from the inrush current may damage sensitive equipment.

The main limitation of VFDs is that they produce a phenomenon called harmonic distortion, where high-frequency currents are induced in branch circuits. However, this can be controlled with a properly-specified harmonic filter; this device absorbs current distortions at the point of consumption, preventing their propagation throughout the installation.

VFD Applications in HVAC Systems

In most cases, VFDs are deployed by construction engineers in HVAC systems to control the speed of blower fans, pumps or compressors.

Cooling Tower Fans

The main purpose of a cooling tower is removing the heat from a water circuit, which may be used in turn for process cooling or for a chiller plant. Cooling towers use fans to establish an airflow, improving heat removal through convection. These are open discharge fans, where there is no ductwork creating resistance to airflow; hence, the savings opportunity through speed control is significant.

When a VFD is deployed for a cooling tower fan, speed is normally controlled based on water temperature. Rather than cycling the fan on and off, it can be driven at reduced speed so that the water returning to the chiller or process is kept at a constant temperature – as previously explained, reduced-speed operation is far more efficient than intermittent operation at full speed.

Air-Handling Units and Packaged Rooftop Units

Unlike the fans in cooling towers, those used in AHUs and packaged RTUs blow air into a duct system, which offers higher resistance and requires a specific static pressure and airflow to be established. These ducts may have several outlets with variable-air-volume (VAV) boxes, where airflow is controlled individually for each zone with a damper.

Without a VFD, the blower fan in the AHU or RTU operates at full speed, and each VAV box is adjusted individually. This is an inefficient approach, however – if neither of the VAV boxes is fully open, energy is being wasted in the form of extra pressure. On the other hand, if the blower is equipped with a VFD, an interesting energy-saving strategy becomes possible:

  • Blower speed can be gradually reduced while VAV boxes are opened incrementally, to keep the airflow and temperature constant.
  • The temperature of different zones is unaffected but pressure is reduced, saving energy.
  • Speed reduction continues until one of the VAV boxes reaches the fully open position. At this point it is not possible to reduce speed further without affecting indoor temperatures.

There is also a comfort benefit with this control strategy: the reduced pressure drop translates into less noise, making indoor environments more comfortable.

Speed Control for Water Pumps

Water circuits are a key element of many HVAC installations, including those that use chillers, boilers and water-source heat pumps. Since HVAC loads are variable, it is often necessary to adjust the water flow depending on total system load. There are three main ways to achieve this:

  • Choke Valve-A choke valve is installed in line with the flow, and as implied by its name it regulates flow by closing partially. This control method is simple, but the resulting pressure loss represents a considerable waste of energy.
  • Recirculation Valve-With this approach a valve is installed on a parallel recirculation circuit, and it is opened gradually to divert a part of the water flow, reducing the flow in the main circuit. In this case, however, there is also a significant energy loss because the recirculated water represents pumping power.
  • Pump Speed Control– The most energy efficient approach is to install a VFD on the pump motor. If a reduced water flow is required, it is just a matter of reducing the pump speed accordingly. With no pressure or recirculation losses, the savings achieved are significant. This setup also uses a choke valve for convenience, but it is normally kept in the fully open position, since the VFD regulates flow.

Chillers with Variable-Speed Compressors

In chilled water air conditioning systems, the chiller is by far the piece of equipment with the highest energy consumption. Therefore, installing the most efficient chiller model that can be afforded is highly recommended.

Energy efficient chillers have helical rotary compressors, capable of adjusting their speed with a VFD, depending on cooling needs. Some models may feature multiple individual compressors to achieve enhanced flexibility and increased part-load efficiency.

When a chiller is highly efficient, the control strategy is normally based on maximizing its capacity rather than running it at the lowest possible set point. The savings achieved by reducing the load on complementary systems tend to be far greater than the extra consumption at the chiller. There are exceptions, of course, and only monitoring and control can offer the correct answer 100% of the time.

Integrating the Entire HVAC System

Equipping all motors in an HVAC system with VFDs is a first step towards energy efficiency, but the best results can only be achieved with central control system, capable of assessing building conditions and adjusting HVAC set points in real time.

The interaction between a chiller and a cooling tower is a great example of how control engineering and VFDs can be applied to HVAC installations:

  • Reducing the cooling tower fan speed increases the cooling load on the chiller.
  • The reverse also applies: reducing refrigeration power at the chiller may require more heat to be rejected by the cooling tower.

If the chiller has a high efficiency, the best option in most scenarios is reducing the cooling tower load. However, only a control system can balance the operation of both components in real time. Ideally, the control system should be able to determine the set point for each individual VFD so that power consumption is minimized at the total system level.

Of course, the performance of an HVAC system starts from the design phase. For optimal results, make sure you work with licensed and qualified construction engineers and other HVAC professionals. Installing an efficient and automated HVAC system from the start is much less expensive than upgrading an existing installation.

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What Can Our HVAC Engineers in Old Mill Creek Do For You? When you re looking for a reliable HVAC Engineering in Chicago? Your best bet is to reach out to is NY-Engineers.Com. Not only for HVAC Firms in Chicago but also MEP Engineering and Sprinkler System Engineering near Old Mill Creek. Call us at 312 767-6877 Since coming to market many property owners throughout Dix Hills, NY already know that [...]

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