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Note that in systems in which the boiler provides domestic hot water as well as steam, the pressuretrol does not control the DHW temperature. This is controlled by an aquastat which can control the boiler independently of the pressuretrol to meet DHW demand.
An aquastat is a device used in hydronic heating systems for controlling water temperature. [1] [2] To prevent the boiler from firing too frequently, aquastats have a high limit temperature and a low limit.
A zone valve is a specific type of valve used to control the flow of water or steam in a hydronic heating or cooling system.. In the interest of improving efficiency and occupant comfort, such systems are commonly divided up into multiple zones. [1]
Hot water reset, also called outdoor reset (ODR), is an energy-saving automatic control algorithm for heating boilers that are typically fired with fuel oil or natural gas. A hot water reset control loop measures the outside air temperature ; this information is used to estimate demand or heating load as the outdoor temperature varies.
In variable-flow hydronic systems, reducing pump speed or staging of pumps with boilers and chillers to suit part-load conditions is an energy efficient method of control. [5] VAV (variable air flow) systems meet the needs of large modern commercial-use buildings, with internal spaces divided into open-plan areas.
Almond-Raspberry Thumbprint Cookies. The raw almonds used in the dough provide a healthy dose of protein, fiber, and healthy fats. Those fats also make the end cookie tender and delicious ...
A thermostat exerts control by switching heating or cooling devices on or off, or by regulating the flow of a heat transfer fluid as needed, to maintain the correct temperature. A thermostat can often be the main control unit for a heating or cooling system, in applications ranging from ambient air control to automotive coolant control.
These systems depend on the proper operation of thermostatic air-venting valves located on radiators throughout the heated area. When the system is not in use, these valves are open to the atmosphere, and radiators and pipes contain air. When a heating cycle begins, the boiler produces steam, which expands and displaces the air in the system.
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