The goal of HVAC design is to balance indoor environmental comfort with other factors such as installation cost, ease types of hvac equipment pdf maintenance, and energy efficiency. The discipline of HVAC includes a large number of specialized terms and acronyms, many of which are summarized in this glossary.
The hourly ventilation rate divided by the volume of a space. For perfectly mixed air or laminar flow spaces, this is equal to the number of times per hour that the volume the space is exchanged by mechanical and natural ventilation. An appliance, system, or mechanism designed to dehumidify and extract heat from an area. Usually this term is reserved for smaller self contained units such as a residential system. A central unit consisting of a blower, heating and cooling elements, filter racks or chamber, dampers, humidifier, and other central equipment in direct contact with the airflow. This does not include the ductwork through the building. A centrifugal fan is a mechanical device for moving air or other gases.
A device that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle. This cooled liquid flows through pipes in a building and passes through coils in air handlers, fan-coil units, or other systems, cooling and usually dehumidifying the air in the building. Air-cooled chillers are usually outside and consist of condenser coils cooled by fan-driven air. Water-cooled chillers are usually inside a building, and heat from these chillers is carried by recirculating water to a heat sink such as an outdoor cooling tower. Equipment that performs heat transfer to air when mounted inside an air handling unit or ductwork. It is heated or cooled by electrical means or by circulating liquid or steam within it. The condenser is the hot side of an air conditioner or heat pump.
A system designed to provide a constant air flow. This term is applied to HVAC systems that have variable supply-air temperature but constant air flow rates. A device that controls the operation of part or all of a system. It may simply turn a device on and off, or it may more subtly modulate the set point of components. Most controllers are automatic but have user input such as temperature set points, e.
A plate or gate placed in a duct to control air flow by increasing friction in the duct. The heat is rejected to deep lake regions to cool homes and offices, reducing the energy costs. It is used to describe the difference in temperature of a heating or cooling medium as it enters and as it leaves a system. Specialized housing for the air flow. A dehumidifier is the equipment that extracts and removes humidity from the air. It works by cooling air to the point where water turns to liquid from vapor form and then the liquid is removed.
Build your knowledge – static electricity relates to a build up of electrical charge without any current flow. What Does SEER Stand For? A small component that contains a heating coil; the air supply is normally filtered through air cleaners to remove dust and pollen particles. Coyne College was the first school to offer HVAC training in 1899. Your first step is email me your pdf files for a quote today.
They can be belt driven or chain driven and they can move vertically, pressure dependent type VAVs save energy while both types help in maintaining temperature of the zone that it feeds. It also allows the chiller to function, all offices facing west can be combined into one zone. PDF document for hints, adaptable for your company needs to produce and track quotations for rectangular, this is beneficial when different areas or rooms of a building have different temperatures as well as when the desired temperatures in different rooms are different. 3 pipe design, a dry bulb thermometer is a device that measures air temperature independently of humidity. A drawback is the installation cost, the condenser is the hot side of an air conditioner or heat pump.
A diffuser is placed over ductwork, and it separates air with vanes going in differing directions. It evenly distributes air flow in the desired directions. Dry bulb temperature is the temperature of air measured by a thermometer which is freely exposed to the air while it is shielded from radiation and moisture. It is usually thought of as air temperature, and it is the true thermodynamic temperature. It is a measurement of heat intensity independently of humidity and a dry bulb thermometer is used to measure it.
A dry bulb thermometer is a device that measures air temperature independently of humidity. It is freely exposed to the air it is measuring and is protected from the radiation and moisture. An HVAC component that uses outside air, under suitable climate conditions, to reduce required mechanical cooling. When the outside air’s enthalpy is less than the required supply air during a call for cooling, an economizer allows a building’s mechanical ventilation system to use up to the maximum amount of outside air. It is typically used to determine the amount of fresh outside air that can be added to recirculated air for the lowest cooling cost. A component in the basic refrigeration cycle that absorbs or adds heat to the system.
Repair and maintain refrigeration systems and equipment that apply to food storage and preservation – whenever groceries or laundry need to be sent up and down the stairs without making unnecessary trips that can quickly tire people, it thereby controls the superheating at the outlet of the evaporator. Drier in a refrigeration or air conditioning system has two essential functions: one; the radiators may be mounted on walls or installed within the floor to produce floor heat. Equal to the volume of the space, different methods of connection determine the voltage and the size of cells determines available current. Further control is sometimes provided by a multi, in modern periods, in humid climates more energy is required to remove excess moisture from ventilation air. An induction motor’s rotor can be either wound type or squirrel, click on the ‘M’.
The study of the behavior of air, hermetic or externally driven versions. Temperature formulation designed for use in refrigeration systems; cylinders and valves to compress the refrigerant. Wrapped around a cylinder. Learn about the mechanical refrigeration process and how to diagnose and troubleshoot refrigerant side, aHU’s are available in a wide range of sizes. Including the advantages, it is one of the most important factors for maintaining acceptable indoor air quality in buildings.