Trying to understand what is "Indoor Reset"

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Old 01-20-12, 12:08 PM
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Trying to understand what is "Indoor Reset"

From the 401 I&OM

Our tekmarNet® product line offers flexible solutions to improve system operation; below are some examples of how this is achieved.
Outdoor Reset with Indoor Temperature Feedback

tekmarNet® provides information from each thermostat to the outdoor reset control. This indoor temperature feedback allows the Outdoor Reset logic to consider the internal heat gains and losses of each zone to continuously fine-tune the water temperature delivered to the heating system. Occupant comfort is greatly improved by maintaining steady air temperatures in the zones while heating plant efficiency is increased by operating the boiler and mixing systems at their lowest possible temperatures.

Outdoor Reset with Indoor feedback improves the quality of today’s high efficiency boiler to ensure the boiler operates at the lowest possible temperature for the longest required cycle; maximizing performance.
Zone Synchronization

tekmarNet® allows the zone on-times, of all zones within the building, to be shared in order to synchronize and coordinate their operation. This zone synchronization prevents potential short cycling of the equipment by preventing small load zones from calling for heat independently.
Zone Post Purge

tekmarNet® allows for the central control to know when the last zone calling for heat is turning off. Before closing the heating zone valve, the control turns off the boiler, however it maintains the pump running to purge the residual heat within the boiler into the heating zone. Zone post purge increases efficiency by reducing boiler standby losses.
 
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Old 01-20-12, 12:19 PM
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Seems like it helps with fixed fire CI boilers, helps more with modcon (T-T), helps even more with modern modcon with boiler modulation (0-10vdc).
 
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Old 01-20-12, 12:26 PM
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The goal is to attain continuous water circulation in your heat emitters. This WILL significantly improve comfort in your home while also saving money from not heating the water any hotter than necessary to maintain the indoor temperature.
 
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Old 01-20-12, 12:52 PM
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Furd, I agree that this is a good idea "continuous water circulation in your heat emitters"

BUT

continuous circulation seems to have nothing to do with Indoor Reset.
 
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Old 01-20-12, 12:58 PM
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Yes, it does. Also, the term is "indoor feedback" not reset, although that is a fine point of semantics.

What the concept is trying to do is to control the temperature of the circulating water to a point where the circulation is continuous and just warm enough to replace the heat lost thereby maintaining the desired set temperature. The outdoor reset is a gross setting and the indoor feedback adjusts the outdoor reset to a much finer resolution taking into account ALL the factors that cause the indoor temperature to vary from the desired setpoint without having to deal with each factor individually.
 
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Old 01-20-12, 02:48 PM
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Furd, you are right!!!

http://www.tekmarcontrols.com/media/...e/e0004_06.pdf

Full Outdoor Reset with Indoor Temperature Feedback
The ideal method of controlling the heat supply to a building is to maintain constant circulation, and to continuously modulate the supply water temperature to match the heat loss from a zone. This type of strategy is Full Outdoor Reset with Indoor Tempera- ture Feedback, and is most cost effective when used in SINGLE zone systems. Since the heat input is constantly matched to the heat loss by the building, there are virtually no indoor temperature swings. Heat distribution losses are also kept to a minimum due to the lower water temperatures in the system, and expansion noises are eliminated, since there is constant circulation through the heating terminals at all times.

Integrated Water Flow Control with Full Outdoor Reset
Combining a Central Zone Control with Full Outdoor Reset provides the best room temperature control and efficiency for a multiple zone heating system. The supply water temperature is continuously modulated to provide the required temperature in the zone with the HIGHEST HEAT LOAD, and therefore constant circulation in this zone will occur MOST of the time. Other zones will cycle ON and OFF to inject heat into the zone as required. Expansion noises are kept to a minimum since the zone on times are longer. Integrated Water Flow Control with Full Outdoor Reset provides more comfort by minimizing indoor temperature swings during mild conditions, and increases system efficiency by providing the lowest possible water temperature to the system.
 
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Old 01-20-12, 07:45 PM
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Keeping with the semantic thread, there is also such a thing as indoor reset, which is basically outdoor reset moved indoors. For a while, I believe it was possible to configure the Buderus GB142 in a way such that it had no outdoor sensor and relied on the AM10 to provide the boiler with info to modulate water temperature. I think Danfoss also has or had a control that was indoor reset-based.

But in most cases, particularly in tekmar-world, what one is talking about is indoor feedback to an outdoor-reset-based system such that constant circulation of water temp that matches heat loss is achieved.
 
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