Variable Air Volume Box with Hot Water Reheat – The variable air volume box or VAV box is a commercial solution to adding multiple zones to large buildings. VAV boxes offer zoning solutions so that separate zoning demands or temperature selections can be maintained in different areas of the building.
If the president of the company wants the temperature in their office to be 70 degrees Fahrenheit but the vice president wants their office to be 74 degrees Fahrenheit then it is possible with the VAV zoning system as long as their VAV boxes are on different zones. (more…)
HVAC Temperature Measurement Conversion - In air conditioning and heating applications it is necessary to accurately measure temperature to offer control of the temperatures relative to the application for which the HVACR equipment is serving. There are four separate temperature scales used to measure temperature and it becomes necessary at times to have the ability to convert between the different scales.
Aside from the temperature measurement scales and their use in HVAC, there are also methods for using specific tools to make those measurements. For example, in many cases, a technician needs to know the dry-bulb temperature and the wet-bulb temperature. In the old days, a technician would use a sling psychrometer to get the wet-bulb temperature.
Today, there are digital instruments that will measure the wet-bulb temperature for the technician. Here we begin with temperature conversion: (more…)
VAV Air Handlers are ideal for providing zones in a commercial building. Office space typically has several offices and open areas that need to be conditioned for the comfort of the people working in those areas or offices. By installing VAV boxes and zoning the ductwork from those VAV boxes these areas and offices can be kept comfortable using a VAV air handler system. More on how VAV boxes work. (more…)
Commercial Boiler Stack Economizer - This is not a normal commercial boiler stack in this boiler room. It has a bypass stack for a commercial hot water economizer. All boilers have make-up water to make up for water lost in the systems, especially for domestic hot water use.
An economizer makes things more efficient. In this regard, the economizer utilizes waste heat. Waste heat is normally vented into the atmosphere. This system was specially engineered and tested to ensure the proper operation of the design. (more…)
Plate Heat Exchanger and Free Cooling - This plate heat exchanger is used in a data center for a chilled water system and is a chilled water economizer. Heat exchangers are used in marine applications, industrial processes including chemical processing systems, food processing, and many HVAC applications including chilled water applications, hot water applications, and economizer applications. (more…)
Heat Pump Electric Backup Heating Basics. There are different types of electric heating available in homes. Probably the most common use for electric heat other than portable electric heating units is electric heat strips. Electric heat strips used for backup heat in heat pumps. Sizing the electric heat strips for heat pump backup heating applications will depend on many different variables.
These variables include the size of the space to be heated and the insulation values of the whole structure. It also includes doors and windows. Additionally, it includes the geographical location of the dwelling, along with many other factors. Backup heat for heat pumps is essential for the defrost cycle. (more…)
Residential Hot Water Boiler Control - The average residential/light commercial boiler typically uses different controls to sequence the boiler. Boiler control in commercial and industrial applications can be very complex and can have added layers of controls outside of the local boiler controls that come from the manufacturer.
There are also differences in the controls between steam and hot water boilers. Breaking all this down into sections we’ll be as concise and detailed as possible while using brevity to describe residential/light commercial boiler control and cover commercial/industrial boiler control in another article. Some of this information will overlap but rest assured we’ll be as detailed as possible.
HVAC Tip - Having the proper humidity levels in your home or business is important not only for your health but also the amount of energy your HVAC systems use to keep you comfortable. If the humidity level is high in the summer you will not feel comfortable. If the humidity level is low in the winter you will not feel warm when the thermostat is set for an average temperature. This will result in turning the thermostat up to compensate and you will use more energy to stay comfortable. A properly designed and installed HVAC system will keep the proper levels of humidity in your home or business and save you money in energy costs by reducing the amount you use the HVAC system. For more information on humidity and maintaining the proper levels of humidity in your home please visit our humidity technical pages.
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HVAC Temperature Measurement Conversion - In 
VAV Air Handlers are ideal for providing zones in a commercial building. Office space typically has several offices and open areas that need to be conditioned for the comfort of the people working in those areas or offices. By installing VAV boxes and zoning the 
Plate Heat Exchanger and Free Cooling - This plate heat exchanger is used in a data center for a chilled water system and is a chilled water economizer. Heat exchangers are used in marine applications, industrial processes including chemical processing systems, food processing, and many HVAC applications including chilled water applications, hot water applications, and 
Residential Hot Water Boiler Control - The average residential/light commercial boiler typically uses different controls to sequence the boiler. Boiler control in commercial and industrial applications can be very complex and can have added layers of controls outside of the local boiler controls that come from the manufacturer.