By Michael F. Hordeski
(The Fairmont Press, Inc.) Examines the connection among commercial automation suggestions and evolving HVAC structures, and the way rising applied sciences should be utilized to HVAC platforms. themes coated comprise boiler and pump keep watch over, warmth pump and chiller optimization, desktop keep an eye on, and instant keep an eye on. DLC: Heating--Automatic keep an eye on.
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Energy demand mode – Solar energy is available and there is a demand for energy in the area to be heated. • No energy mode – No solar energy is available, but there is a demand for energy in the area to be heated. In addition to supplying or removing heat and/or humidity from the conditioned space, the airhandler can also provide ventilation and fresh air movement. The cost of the energy used varies, this produces a yearly operating cost of several dollars per square foot of space. This allows airhandler optimization gains of much greater percentages of savings compared to the optimization of other plant operations.
The typical operating cycle for one day's operation is described. As long as the collector temperature remains several degrees above the tank temperature, the pump continues to operate. This type of differentialthermostat control system assures that maximum heat energy is stored and retained in the tank under various weather conditions. This directly measures the temperature of the water leaving the collector. If externally located, it should be as close to the tankend of the line as possible.
In the heating cycle, heat is absorbed from the loop water by a water cooled evaporator coil and absorbed heat plus the compressor heat is rejected to space through a roomside air condenser coil. When the loop water temperature drops below the minimum value, heat must be added to the system using a water heat exchanger. Table 11 summarizes these different HVAC system classifications. Table 11 HVAC System Classifications AllAir Systems Singlepath singlezone, drawthrough Singlepath multiterminal Variable air volume (VAV) Induction reheat (IR) Constant volume reheat (CVR) Powered induction units (PIU) Parallelpath systems • Multizone, blowthrough • Dualduct, constant or variable volume AirWater Terminal Systems Fancoil units, central ventilating air, 2, 3 or 4pipe AllWater Terminal Systems Fancoil units with direct outside air intake, 2, 3 or 4pipe Unit ventilators Packaged Terminal Systems Ductless split Through the wall units with electric or hydronic heat Unit ventilators with direct expansion cooling and electric or hydronic heat Water source heat pump Page 28 Solar Heating Systems There are four main parts to a solar heating system: • The collector or absorber, • The heat storage tank, • Control system and • Auxiliary energy source.