Ammonia Chilled Water System | Commercial HVAC
This chilled water unit is a new ammonia chiller. This unit is also unique in that it has no compressor. Instead it uses the chemical properties of ammonia and heat from natural gas to condense the refrigerant which is ammonia. A chiller provides chilled water to a chilled water loop. Cold water is circulated through a loop where it is direct into a coil in an air handler. Air is blown across a coil where a heat exchange process takes place. The air handler discharges cool conditioned air throughout a duct system. Chilled water systems are typically used in commercial air conditioning applicationsbut there are some chilled water systems in residential applications. (more…)
HVAC 3R NEMA Rated Control Panels
HVAC 3R NEMA Rated Control Panels – These control panels offer resistance to inclement weather. They house the DDC controllers for two small chillers and two air handlers. The chillers provide chilled water for air conditioning to the air handlers. The controllers offer energy management for the air conditioning system. The controllers were mounted outside for a few reasons. The main reason was because this location was closest to the HVAC equipment which provides air conditioning to the building. The secondary reason was because there was no safe or ideal location to install these panels inside the building. (more…)
DX CRAC Unit Condensers | Critical Facility HVAC
DX CRAC Unit Condensers | Critical Facility HVAC – Most data centers do not utilize HVAC DX (Direct Expansion)CRAC units or air conditioning but instead use chilled water systems to provide cooling for the data center. In smaller buildings such as remote telecom buildings DX air conditioning systems are used to keep the equipment cool and operating efficiently. A DX CRAC Unit uses vapor compression refrigeration to provide cooling with a chemical refrigerant versus a chilled water system that utilizes chilled water from a chiller. CRAC Units or Computer Room Air Conditioners also serve telecom facilities for telephone services including cellular telephone facilities in remote locations. The CRAC units that serve telecom facilities in remote locations are typically DX CRAC Units that have utility back-up by stand-by generator so that if the utility fails to provide electricity for whatever reason the stand-by generator kicks on and provides power so that the telecom facility can remain on line. (more…)
Heat Pump Systems – There are different types of Heat Pumps in use in both the commercial HVAC heat pump markets and the residential HVAC heat pump markets. The two main types of heat pumps are the air source heat pumps and the water source heat pumps (or geothermal heat pumps). Within the water source heat pump types there are several sub-categories. Mechanically and electrical speaking, heat pumps all work the same way but use different methods of moving the heat from one place to another. Regardless of the type of heat pump it is, heat pumps are based on the theory of heat pumps that says heat can be moved from a warmer place to cooler place. Air source heat pumps are popular in southern regions where the temperatures in the winter are considered to be mild while water to air heat pumps can be used in any climate as long as there is a moderate (temperature) and reliable water source to move the heat from one place to another.
Most air conditioning and heating systems require some form of duct work to channel or direct the air to places in the dwelling where the conditioned air is needed. There are many types of ductwork available and often times the ductwork can make a big difference in your utility bills. For that reason, it is important that the ductwork is installed correctly by qualified installation technicians. A poor installation job will result in poor performance, bad air flow, leaky ductwork systems, and higher than usual utility bills. Another important factor in the installation process is to make sure the duct work is sized properly. Over sizing systems cost more and does not maintain the desired air flow and undersized ductwork causes the system to strain mechanically and can be noisy. It is important that you have qualified people design and install your system from start to finish so that you get the best and highest performing duct work system money can buy. It is also critical that the air conditioning ductwork system be designed for the air conditioning load. (more…)