Commercial buildings in power electricity 40% above statistics air conditioning, so how to choose the correct use of air-conditioning equipment, air conditioning system and maintenance of energy saving, is an important topic today.
(1) how to choose the central air conditioning system
1 please buy high energy efficiency ratio of water and air EER host government announcement lowest standard of EER value.
2 and the host EER water chiller, the province electricity, generally speaking, each EER value, improve 0.1 percent water chiller and can save electricity. The capacity chillers per hour can remove heat from indoor, 1 hour tons frozen removed from indoor heat 3,024 kcal Btu (quite), the 12,000 per square metre, room about 0.15 frozen tons (equivalent to 450kcal/h), selection of air conditioning host frozen tons capacity is too big, will make the light load operation time compression, or frequently, and loss compressor life electricity

Note:
1 chiller energy efficiency ratio (EER kcal/h) - W = cooling capacity (kcal/h) divided by the regulation of power consumption test cooling (W),

2 coefficient of performance (COP) = cooling capacity (W/W) of power consumption (= 1.163 EER. 1 RT (frozen tons) = 3,024 kcal/h.

(2) how to install the central air conditioning system

1 chiller should be placed in concrete foundation, flat or base, using the bolts and maintain a level, with slurry. Cold water around the host should be left to the proper maintenance of space in the future, ChouHuan or cleaning maintenance etc. Copper

2 pump export pipeline should add gauge, in order to understand the practical operation condition.

3 good ventilation cooling towers around, there shall be cut off, lest affect cooling capacity. Avoid installation in the hot line, lest affect the cooling effect of cooling towers.

4 small cooling fan installed, water dish must maintain certain Angle, and discharge condensate, Each outlet air duct in the case shall be appropriately adjust air distribution, lest cause certain regional air. Air inlet and outlet not too close, lest cause short cycle and cold room effect.

5 pipe diameters 65mm in the use of threaded connections, or use 80mm welding or flange. Drains every meters should keep 1 cm gradient. Cold water pipe highs or other necessary, automatic vent valve should be installed, With low water pipe, valve should be cleaned with system.

6 in disagreement, air throttle.in differences in order to adjust the equipment and the lock. Air duct insulation, and insulating materials shall be shall conform to the state standards.

(3) how to operate the central air conditioning system

1 air temperature setting limits to 26-28 degrees advisable, and shall furnish automatic temperature control device, lest too cold and wasting energy. The room for frequently, indoor temperature is not lower than outdoor temperature 5 ° c, lest affect health.

2 daily timing records of running water main oil temperature, pressure, temperature, pressure, temperature, cold media refrigerant pressure, current and voltage, etc, in order to understand the practical situation.

3 in the circumstances, moderate increase exports, cooling water temperature increase water outlet temperature of every 1 ° c, can reduce the consumption of water host.

4 should reduce water temperature, reduce the temperature of the cooling water per 1 ° c, can save water consumption of host.

5 hurried off half an hour, use cold water circulation pump host to run.

6 if a few late to work overtime, unit shall supply the overtime space partition only to save energy, and air conditioning.

7. Water system if belong to, and air conditioning water separation system using two valve control cold water pump, area can be mounted to the inverter and the number to control system, the energy conservation effect.

8 the wind, underground parking lot, can be added in the vehicle in the controller, the peak time, set each hour operation, about 15 minutes to save energy.

9 be closed during the air-conditioner use Windows, in order to prevent the cold air leakage or can permeate, air conditioning FengKouChu back not accumulation sundries boxes, lest affect return effect.

(4) how to maintain the central air conditioning system

1 water condenser copper pipe is susceptible to poor water quality, to produce the scaling, must be at least once annually cleaning.

2 the frozen oil oily color black or impurity, criterion appropriate immediately.

3 year shall conduct periodic compressor motor insulation test.

4 keep refrigerant quantity is normal, if any, should leak detection and filling.

5 regular inspection pump bearing, and add oil, water injection shaft if there is a leak phenomenon, should promptly repair, Import and export gauge shall be damaged.

6 should be cleaned once monthly cooling towers.

7. Inspect water cooling towers, float switch and sprinkler head is normal.

8. The air cooling towers of protective if falls off phenomenon, should immediately on, lest cooling water loss and sundry fell into a cooling effect, influence.

9. Small cold air extractor fan and the box, and regular cleaning should monthly monthly inspection transmission belt firmness and control system is normal.

The motor shall periodically maintain (lubricating), can reduce the friction loss of motor.

(5) the central air conditioning system efficiency

The central air conditioning system of high efficiency in EER values or high COP value of cold outside, still need to consider host water system, air system and saving energy control, the energy to do, briefly explain as follows:

1 pump head and flow with cold water on the frozen number, every frozen number of cooling water for 13 LPM liter (many), cold water standing for 10 LPM 70%, and the appropriate chooses high efficiency pump and motor.

2 air conditioning system of fan, per 1,000 L/s send air power consumption should be less than 1.7 kW.

3 in cold water cooling towers number of hosts number about 1.25 times as appropriate. Can use more parallel combination with temperature control, open operation sets.

4. Choose appropriate capacity motor, usually in 75 ~ 100% load rate between the highest efficiency.

5 and the control air division, or air conditioning in using similar (e.g., temperature and air conditioning) more space, the temperature sensor group should be installed in automatic temperature control, are as follows:

(1) automatic stop: by personnel sensors, can use air conditioning program controller or manual of procedure automatic timer stop.

(2) independent air-conditioning area: each independent air-conditioning area should be closed or control air conditioning provide fresh air and exhaust air, the independent control device.

Each independent air-conditioning area is more than 2,000 m2 floor area of air conditioning and a floor.

(3) of the exhaust fan: airtight parking area more than 14,000 L/s, can design according to the parking space of carbon monoxide concentration (PPM) value, controlling fan ventilation or adjust controller, while the use of strength, parking lot TongFengShan can stop running or adjustment of ventilation.

(6) air conditioning system design

1 overall design: basically, can save the overall design should contain at least can save the energy saving measures in five parts, are as follows:

(1) application of green building energy saving method. The daily

(2) selected high-efficiency air-condition equipment.

(3) design reasonable consumption of the air conditioning system.

J (4) to save energy management technique air conditioning.

(5) the correct maintenance management system in most of the energy.

2 air-conditioning load characteristics: office building, air conditioning load characteristics as follows:

(1) office time and use fixed number of relatively easy to estimate, air conditioning load.

(2) should be avoided full working overtime at night air supply to minority.

(3) little space, such as 24-hour duty, computer room, should adopt independent air-conditioning have the effect of energy saving.

(4) general design reference for personnel density of each 7 to 19m2 space, for 13m2 / intermediate values, meeting personnel density per head 2m2.

(5) from the outer area (was) of the air conditioning load changes greatly, air conditioning to properly designed capacity control, in order to avoid sometimes too cold, comfortable and wasting energy.

3 energy control air conditioning system design:

(1) the variable air volume (VAV) in part load controller designed by energy saving, within the duct static control air blowers speed and pressure, appropriate setting for the total design pressure about one-third of the (a), when the downstream area for the design of air blowers, 50% less power consumption will be below 30% of the design.

(2) the air pump system should be designed for variable flow control, the VWV (flow) of the original design flow can be controlled to 50% or below. In the design of water at 50%, there must be controlled and device (such as in motor inverter speed), change motor pump is the power YuQuanZai 30%. Variable flow control or device needs to have the minimum differential pressure control or control functions, differential pressure is located in the most remote points should be the heat exchanger or heat exchangers maximum differential pressure demand. Contains many of the air conditioning system of water chillers, as a part of the water authority when the number of relatively close, must reduce water flow to save water consumption.

(7) system testing and acceptance of the note

Air conditioning system shall be completed in individual performance test, air and water to be balanced to design, system design, except for the function of more energy for the effect of operation, the following some precautions:

1 the system acceptance documents: the acceptance, the actual installation should build a caption of documents, records shall include each location of equipment and performance data, duct and conduit systems, including the general layout of size and terminal air or design flow. Except, operation and maintenance manuals should include at least the following:

(1) every equipment need maintenance data, the size of the equipment and the choice of options.

(2) each equipment operation and maintenance manual is needed, and the ways to repair action for.

(3) at least a repair name and address of the agent.

(4) air conditioning control system maintenance and calibration of the information, including the circuit diagram, the sequence diagram, control, etc., should be fixed setpoints permanent record in the control device of control chart or digital control system in program design notation.

(5) for each system operating methods and Suggestions of the future of complete set point.

2 balance testing system,

(1) when the completion acceptance to air conditioning system in accordance with the relevant standards measurements, balance and adjust air duct, and the differences and the design value less than 10%.
(2) air system balance, to open its first draft loss to minimum and variable flow distribution system but not to balance the adjuster (for example, calibrated VAV terminal box), the more must be adjusted to design all the traffic.

(3) of the balance of water system should be first open the throttle to minimize the loss, then trim pump impeller or adjust the flow speed to pump design. Each water pump system has the differential pressure measurement function or in each side of the pump are left test.