HVAC Chicago Heights2018-11-19T21:37:22+00:00

HVAC Chicago Heights | Expert Power Efficient System Designs

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Don’t be fooled by the name NY Engineers is the top choice if you need a Full Service Heating Cooling Air Conditioning Furnace (HVAC) Engineering Firm in Chicago Illinois. We are not only an HVAC Chicago but also a leading provider of MEP Engineering Engineering services near Chicago Heights. Call us at (+1) (312) 767-6877

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In recent times huge crowds have been stopping by our site looking for Value Engineering near the Chicago area. That is due because of the reputation we have built in this types of projects. With that said, many builders from Alsip to Naperville, IL, are not aware that NY Engineers is also the ideal choice for anyone in search of HVAC Company near Chicago, Illinois.

The quest for energy-efficient buildings involves power efficient HVAC system design. This will include systems for lighting, architectural enclosure, domestic water heating, HVAC, and vertical transportation. The loads for the HVAC systems can come primarily from five different bases including lighting (cooling), the construction envelope (cooling and heating), ventilation (cooling and heating), equipment for program use (cooling) and occupancy (cooling).
The ventilation load will certainly be a purpose of either the mechanisms necessary so as to introduce it in a space and control contaminant concentration or the quantity of persons that will use the area. In virtually all climates within the southwestern and eastern regions of the united states, to lower outter air flow helps you to save energy whenever the exterior air is either humid and warm or very cold.
Controlling the ventilation rate will probably be dependant upon occupancy which is referred to as a kind of demand control ventilation. This can be a common type of energy conservation strategy that is utilized for spaces with irregular or heavy occupancy. Having heating and cooling loads dropped as low as possible can be carried out by utilizing an increased performance building envelope, occupancy sensors, and high performance lighting that employs daylight response of lighting controls.

Chicago HVAC Engineers vs HVAC Techs

When you’ve ever discussed the distinction between a HVAC Technician versus HVAC Technicians, then read on:

Chicago HVAC engineers are the people who manage setting up of air-con systems both for commercial and residential buildings. They spend a lot of their work in offices doing more impressive range management and planning of installations nonetheless they do also go to job sites every once in awhile.

In comparison, HVAC technicians often do more of the hands-on work  that deals with maintenance and repair. A HVAC tech may work together with an engineer to accomplish several of the installation work, particularly for smaller jobs. Generally HVAC technicians do much more travel and may spend time and effort changing filters, identifying leaks, doing recharges or decommissioning old and outdated systems that use old refrigerants.

HVAC engineers may have the chance to make more decisions about systems that are being used, plus they are the people who would offer advice about the most sensible refrigerants and which systems would best suit a greater building. In the industry, there is some rivalry between ‘the suits’ and ‘the ones that will get their hands dirty’, but the two jobs require an excellent familiarity with how air conditioner really works. Lately huge crowds have been checking out the NY-Engineers.Com website searching for things like HVAC Apprenticeship Chicago. However, the focus of our firm is to be the number one choice for anyone looking for a HVAC Chicago and or any of our other services including Mechanical Engineering Engineering services. We ask that anyone searching for additional information about our Heating and Air Conditioning (HVAC) Engineering Firm in Chicago Illinois checks out at our Construction Administration 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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