Hiring a HVAC Engineering Firm in West DePaul Chicago

Construction Engineers

The majority of real estate investors throughout Ithaca, NY already know that NY-Engineers.Com is the engineering firm to call if you’re searching for Fire Protection Engineering in New York City. What a lot local developers have not realized is that NY-Engineers.Com is also your top choice if you are searching for HVAC Engineering services in West DePaul Chicago, Illinois.

Hiring a HVAC Engineering Firm in West DePaul Chicago entails the cabability to explore and comprehend what’s essential for your construction. Each person is going to be altered in terms of the contracting procedure and it’s better to check out these attributes.

1) Knowledge: A good firm will usually have qualified staff onboard to aid with HVAC needs. They aren’t only trained but are going to have years of expertise in the trade. This keeps things simple, streamlined, and as efficient as you require them to be. Clients can seem confident with an expert available to aid.

2) Portfolio of labor: Check out their history to see exactly how they have done previously. It can help shed light on whether or not the firm is a zealos team who has great outcomes. If you find problems with their portfolio then it’s likely to filter to your create. Center on this without delay!

Those characterize the methods for working with a top-tier organization and making certain the answer is top notch. Or else, the organization can find themselves creating more problems than solutions. Start out with these tips and create a simple list to make the method easier.

This is why a lot of engineers are brought on as consultants because they gain practice. That is when, they are only accountable for the next step of the style and might provide insight about what works or what does not.  Most HVAC systems are started through the help of an West DePaul Chicago HVAC design engineer.

Key HVAC Design Engineer Tasks

An HVAC engineer in West DePaul Chicago is given a listing of assorted duties depending on the firm, its requirements, and how the job grows.

On the whole, the HVAC design engineer tasks are going to include a variety of jobs including designing various HVAC systems. Every assignment will be unique as customers come in with customized requests. These bids may include the size of their setup, how it is going to perform, and the performance metrics they are after with a brand new HVAC system.

A professional West DePaul Chicago HVAC engineer will almost certainly take a seat, comprehend these needs, and prepare a full-fledged HVAC system with high-quality design devices. Things are all kept in mind during this procedure and that is what HVAC design engineers are relied on to perform. Together with designing the HVAC system, the contractor has to be certain the system is carried out correctly and fits in accordance with precisely what the client wants.

This is the reason a lot of engineers are brought on as consultants as they get practice. In those situations, they are only responsible for the following element in the process and might offer understanding on what works or what doesn’t.  Most HVAC systems are founded through the help of an HVAC design engineer in West DePaul Chicago. There is a great possibility you would like additional info on the HVAC Engineering services in West DePaul Chicago, IL by NY Engineers we invite you to visit at our West DePaul Chicago Electrical Engineering blog.

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Operating Modes of VRF Systems in HVAC Engineering

HVAC Mechanical Engineer

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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