HVAC Engineering Pullman Chicago, IL2018-10-29T20:06:06+00:00

What Can Our HVAC Engineers in Pullman Chicago Do For You?

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If you’re looking for a reliable HVAC Firms in Chicago? The one to go to is NY-Engineers.Com. Not only for HVAC Chicago but also MEP Engineering and Protection Engineering in or near Pullman Chicago. Call us at (+1) (312) 767-6877

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Since 2011 many real estate investors throughout Freeport, New York already know that NY-Engineers.Com is the engineering firm to contact when you are ooking for Mechanical Engineering in New York. What many local construction companies have not realized is the NY-Engineers.Com is also your top choice if you’re looking for HVAC Engineering services in Pullman Chicago, Illinois. If you want additional details on what Pullman Chicago HVAC design engineers do? It is an exclusive profession that has an extensive listing of responsibilities. An HVAC design contractor will be asked to get through a variety of concundrums to resolve the core issue. This job calls for distinct skill, professionalism, and the cabability to handle time cleverly.

After an HVAC personel is licensed to work, they will sign on with an engineering firm and start to work on many cooling, heating and refrigeration systems. Their task is always to design new and/or additional selections according to their client’s requests. Every single client will have an exclusive set of wishes whether or not it involves developing codes or personal performance expectations. Using all of this info, the engineer goes on a ride towards building something which is eco-friendly, energy-efficient and ideal for the place it might be utilized in – (industrial, commercial or residential. They are often accountable for the primary drafts and overseeing the particular installation.

On the whole, an HVAC engineer in Pullman Chicago will likely be seen working in a design company or even in a consulting firm based on their numerous years of expertise. Many engineers shift right into a consulting job while they grow older and gain a better understanding of what is expected of them.

Comparison: HVAC Engineer vs HVAC Technician

HVAC Technician and HVAC Engineer are often confused with each other. Nevertheless, they have different tasks with regards to dealing with HVAC systems. It is essential to understand the variance both as being a parton as well as an expert

An HVAC technician in Pullman Chicago carries a more active job, meaning they are usually seen on the way to a customer’s house to inspect their existing system. They often times handle the repairs, installations, and over-all keep which is required ever so often. Most of their jobs are done alongside the buyer, which implies they must realize how to interact with people in the right way.

By having an HVAC engineer, they are accountable for creating a brand new HVAC system and ensuring it fits exactly what a customer is after. It must fit precisely what the home owner wants whether or not it has to do with their setup, property, or everything else related to new system. They are also introduced to refer to HVAC designs to ensure things are all in step with the highest standards. This is the reason they can end up spending some time in consulting assignments or at local engineering businesses. This is actually the distinction between these two career paths; HVAC Engineer Versus HVAC Technician. There is only so much you can save this page if you would like additional details on the HVAC Engineering services in Pullman Chicago, IL by NY-Engineers.Com we invite you to stop by at our Pullman Chicago Value Engineering blog.

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Operating Modes of VRF Systems in HVAC Engineering

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Variable Refrigerant Flow (VRF) is an HVAC engineering (air conditioning) technology that achieves an extremely high efficiency by varying the flow of refrigerant to indoor units, based on the exact demand of each individual area. This ability to control the flow of refrigerant makes VRF systems ideal for applications with varying loads. In addition, VRF systems can also provide space heating, consolidating two building systems in one and saving space.

VRF technology is available in two versions – heat pump systems and heat recovery systems. Heat pump VRF systems can either cool or heat the entire building but cannot perform both functions at the same time. Heat recovery systems do not have this limitation and can serve simultaneous heating and cooling loads, thus leading to 3 different modes of operation:

  • Cooling mode
  • Heating mode
  • Simultaneous cooling & heating, or heat recovery mode

VRF Systems in Cooling Mode

In cooling mode, VRF operation is not very different from that of an air conditioning system: indoor units are supplied with liquid refrigerant, and an expansion valve inside each unit controls the amount of refrigerant flowing through. When refrigerant enters the cooling coil, it undergoes evaporation, removing heat from indoor air and thereby cooling the room. The heat extracted from indoor spaces is then rejected outdoors.

VRF systems are much more efficient than conventional packaged rooftop units (RTU), packaged terminal air conditioners (PTAC) and window units, according to HVAC engineering experts. Ductless mini-split systems and water-cooled chillers offer a similar efficiency in cooling mode but are unable to operate in heating mode.

VRF Systems in Heating Mode

Unlike cooling mode, where indoor units receive liquid refrigerant, here they are supplied with hot gas refrigerant. Gas flow to individual units is controlled with the same electronic expansion valves used for cooling mode, and the heating effect occurs when hot gas undergoes condensation.

The basic principle is still the refrigeration cycle, with the difference that heat is absorbed from outdoors and rejected indoors; in simple terms it is like air-conditioning the cooler outdoor environment to remove heat from it and use it indoors. This operating mode change is made possible with special 4-way reversing valves, which exchange the roles of evaporator and condenser between indoor and outdoor units.

In heating mode, the electric power consumed becomes useful heat, while in cooling mode it is rejected outdoors. Thus, a VRF outdoor unit can operate above 100% of its rated capacity when in heating mode. However, it is also important to note that the capacity may be derated, especially when the system is subject to a large variation in outdoor conditions. Longer piping lengths, longer distances between the outdoor unit and the last indoor unit, and higher vertical separation are some other causes of derating.

VRF Systems in Heat Recovery Mode

A heat recovery system is ideal when simultaneous heating and cooling are required. The greatest efficiency is achieved when the heating and cooling loads are equal, by maximizing the amount of energy transferred from one zone to another using the refrigerant. Heat rejection from cooling spaces can be utilized for space heating in the areas that need it at the same time. Thanks to this configuration, each occupant is free to choose either cooling or heating mode.

Heat recovery systems are very useful when a building has an east-west or south-north orientation with glass façades. East-west and south-north orientations cause a large difference in load requirements for each direction during the morning and evening, providing a chance for the VRF system to operate in simultaneous heating and cooling mode. Heat recovery is particularly useful in buildings with electrical rooms or data centers that need permanent cooling, since they also become a constant source of heat.

Heat Recovery System Piping Configurations in HVAC Engineering

Heat recovery systems come in 2-pipe and 3-pipe configurations, where the 2-pipe system is the option requiring the highest refrigerant flow. To operate with reduced flow, the 3-pipe system has a liquid line, a high-pressure gas line and a low-pressure gas line. The control function is achieved with a Mode Change Unit (MCU) or Mode Selection Box, which has three headers for high-pressure gas, low-pressure gas, and liquid.

  • When there are zones that need space heating, their indoor units work like condensers, supplying heat from the condensation of high-pressure refrigerant gas. After heating, the saturated refrigerant is fed to the liquid header.
  • Liquid refrigerant is then supplied to the units in space cooling mode, where it evaporates and absorbs heat, becoming a low-pressure gas.
  • The low-pressure gas is returned to its respective header and then to the compressor, repeating the cycle.

In this case, the outdoor unit must only provide the balance between heating and cooling – the one that is higher will determine the operating mode of the outdoor unit.

  • If cooling load is higher, the outdoor unit operates as a condenser, rejecting the surplus heat outdoors.
  • If the heating load is higher, the outdoor units operates as an evaporator, drawing from outdoor air the extra heat needed inside.

The best recommendation is locate the MCU in a public access area such as a corridor, thus minimizing noise and disruption for the end user. Maintenance of heat recovery systems is relatively easy, since the outdoor condenser unit is only connected to the MCU, facilitating system separation into upstream and downstream portions.

As per ASHRAE Standard 34-2013, the refrigerant concentration limit (RCL) is 26 lb per 1,000 ft3 of room volume for occupied spaces, and 13 lb per 1,000 ft3 for institutional buildings. This can be easily achieved by locating the units outside of compact rooms. According to Standard 15, a VRF system is classified as a direct system/high-probability system where a refrigerant leak can potentially enter occupied space.

The use of heat recovery systems in VRF proves to be better option, economically and environmentally, in these types of HVAC engineering systems. This spares the building owners from having to install and service two separate systems, while achieving a very high efficiency. With separate systems for space heating and cooling it is impossible to boost efficiency by exchanging heat, even if both systems are very efficient separately.

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