HVAC North Lawndale Chicago2018-11-28T11:15:36+00:00

HVAC North Lawndale Chicago | Expert Power Efficient System Designs

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Don’t be misled by our NY-Engineers.Com is your best bet if you seek a Full Service Heating and Air Conditioning (HVAC) Engineering Firm in Chicago Illinois. We are not only an HVAC Contractor in or near Chicago but also a leading provider of Protection Engineering services in or near North Lawndale Chicago. Call us at (+1) 312 767-6877

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In recent times huge crowds have been stopping by the NY-Engineers.Com site searching for HVAC Engineering near the Chicago area. This is due primarily due to the following we have built in this kind of work. With that said, a lot of builders from Bolingbrook to Park Ridge, do not know that New York Engineers is also the ideal choice for anyone searching for HVAC Contractor in or near Chicago, IL.

The quest for energy efficient buildings involves energy efficient HVAC system design. This may include systems for domestic water heating, architectural enclosure, HVAC, lighting, and vertical transportation. The loads for the HVAC systems may come primarily from 5 different bases including lighting (cooling), your building envelope (cooling and heating), ventilation (cooling and heating), equipment for program use (cooling) and occupancy (cooling).
The ventilation load might be a purpose of either the machines necessary to be able to introduce it in a space and control contaminant concentration or the number of folks who will occupy the area. In the vast majority of climates from the southwestern and eastern regions of the US, to reduce outside ventilation helps you to save energy whenever the

outside air is either warm and humid or very cold.
Manipulating the ventilation rate will probably be determined by occupancy which is called a kind of demand control ventilation. This can be a everyday sort of energy conservation tatic that is utilized for homes with irregular or heavy occupancy. Having heating and cooling loads dropped as low as possible can be achieved by making use of a higher performance building envelope, occupancy sensors, and high performance lighting that apply daylight response of lighting controls.

Chicago HVAC Engineering services versus HVAC Technicians

If you have ever thought about the difference between a HVAC Engineers versus HVAC Engineers, then please read on:

Chicago HVAC engineers are definitely the individuals who watch over installing of air cooling systems for both commercial and residential buildings. They spend a great deal of their day in offices doing higher-level management and arranging of installations nevertheless they do also stop by job sites from time to time.

But, HVAC technicians usually do a lot of the hands-on work  that deals with maintenance and repair. A HVAC technician may work with or for an engineer to accomplish a number of the installation work, particularly for smaller jobs. Generally HVAC technicians do a lot more travel and could spend lots of time identifying leaks, changing filters, doing recharges or getting rid of old and outdated systems that utilize old refrigerants.

HVAC engineers could possibly have the ability to make more decisions about systems that are used, plus they are the individuals who would offer assistance with the most sensible refrigerants and which systems would best suit a much bigger building. In the trade, there exists some rivalry between ‘the suits’ and ‘the ones that will get their hands dirty’, but the two jobs require a good understanding of how air-con really works. As of late huge crowds have been checking out our sites searching for things like HVAC in Chicago. Nevertheless, the goal of our organization is to be the to go to company for those searching for a HVAC Company near Chicago and or any of our other services including Protection Engineering services. We ask that everybody searching for more details about our Heating & Air Conditioning (HVAC) Engineering Firm in Chicago Illinois visits at our Sprinkler Engineers blog!

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Operating Modes of VRF Systems in HVAC Engineering

Importance Of Value Engineering

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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