】 【Weak current College on realization through DDC-controlled air conditioning system and energy-saving.

<br> <br> Central air conditioning system and energy-saving comparison mainly rely on automatic control, now more commonly is DDC control, the following simple talk through DDC control of air-conditioning system saving energy. <br> <br> 1 ., power room <br> <br> (1) according to the actual cooling load and thermal load control chillers and pumps run number to achieve the energy saving effect. By frozen water temperature and water temperature difference and back to the water flow is calculated .and chilled water system of cooling load, and the decision on the basis of the actual cooling load is put into operation of the refrigeration unit and the number of associated facilities in order to achieve the best power-saving state. the temperature of the chilled water .for backwater to 12 / 6 degrees. <br> <br> (2) the following order to start and stop the frozen system to ensure the normal operation of the system. Start: frozen water electric valve, chilled water pumps, determine whether there .is frozen water pipes in the water flow through, 15 seconds after the chillers. Stop: chillers, 15 seconds after freezing water electric valve, frozen water pump. Frozen water pump spare mechanism, ensure the accident circumstances and extend equipment life. Refrigeration system, .each frozen water pump are spare, when any one frozen water pump fails, DDC controller based on the accumulated water pump running time, running time running short pump, fill the need of frozen water. <br> <br> (3) the system .detected a chilled water flow switch alarm will stop running the unit and skills into another unit operation. <br> <br> (4) DDC controller under refrigeration units run cumulative time, every time I boot accumulated time at least one of the refrigeration unit ., in order to achieve the balance of the unit operating time. Chilled water system total supply, total return water pressure value between (△ P) and systems of differential pressure setting value, the control of the aperture, the bypass valve to maintain the pressure .of frozen water system at a reasonable level. <br> <br> Control Center computer detection, screen real-time display of the following parameters: <br> A, unit commitment of time, cumulative elapsed time. <br> B, chilled .water for back pressure, temperature, flow rate, cooling capacity. <br> C, chillers operating status, overload alarm. <br> <br> 2. cooling water system <br> In order to make the unit in water temperature lower than .excessive cooling season 18 ° c is still working, in the cooling water for water manifold located electric regulating valve, when the water temperature below 18 ° c, the electric valve opening, part of the proportion of recycled water from the by-pass pipe flow .back, and low-temperature water, cooling water temperature to ensure the unit to function properly. <br> <br> 3. air conditioning terminal equipment <br> Control: by time program and best start-up and shut-down control back .to the fan running. Starting times, run times. According to the outdoor air temperature, indoor temperature and room temperature setting value through best start-up and shutdown controller, to calculate the air conditioner on / off of the best time to achieve energy savings .. <br> <br> (1) blowers and new, return air electric valve interlocks. <br> (2) outage return air valve fully open, fresh air valve full off. <br> (3) fire protection systems and interlocking .fan. In the event of fire, air conditioners will stop automatically. <br> (4) fan and chilled water valve interlocks, the fan stopped, frozen water valve closes automatically. <br> (5) through the time program for air- .conditioner scheduled stops, time intended for up to one year. <br> (6) can be according to the specific situation of the site and the user's request, on the program's parameters and chain point modification and creation. <br> (7) .with indoor temperature control air and fresh wind scale. <br> (8) DDC controller detects the outdoor air temperature and to outdoor temperature setting after calculation logic to determine the proportion, regulating the right outdoor air valve and return air valve to open degree, .to ensure that in the four seasons provides sufficient fresh air, while in the outdoor air temperature near the indoor temperature setting, the more the introduction of fresh air as far as possible, to achieve energy savings of ergonomics. <br> (9) air .handling units, air supply unit air duct temperature sensor based on the measured temperature compared with the set value, the output signal, adjust the return pipe of proportional integral electric regulating valve to open degree, regulate water flow, ensuring the return air temperature fluctuations in .the set. <br> (10) in table coolers (and heater) is the measurement of the temperature sensor is below the set value air temperature (5 ° c), Frost alarm beep signals that control shutting down the system, while at the .same time electric outdoor air valves back into the mains electric regulating valve all the way up, to prevent freezing air coolers. <br> (11) fan coil with temperature control switch controls the return pipe on electronic two way valve for switching status, reach .the purpose of controlling the room temperature. Guest room all new fan in the air duct to increase automatic dry steam humidifiers, winter indoor humidity requirements <br> <br> <br> <br> <br>.