HVAC system of environment protection and energy technology

Paper Keywords: energy consumption energy and the environment
Abstract: Reducing energy consumption of HVAC systems is of great significance, design and system operation itself should take into account all energy-saving measures in order to effectively achieve the purpose of energy saving.

Introduction
China has a vast, region wide. From north to south into the cold regions, cold regions, hot summer and cold winter zone, the subtropical region and temperate regions. Of cold regions, cold regions and hot summer and cold in winter are some towns in the region need heating, coal heating the atmosphere causing serious pollution. At the same time, hot summer in most parts of China, but also the increasing popularity of air conditioning, building air conditioning energy consumption is increasing rapidly. According to statistics, air conditioning energy consumption accounts for about 55% of building energy consumption about 20% of the total energy consumption society. Thus saving air conditioning systems can not be ignored, reducing the energy consumption of air conditioning systems to reduce overall energy consumption of building systems is significant, both to alleviate the power shortage situation, optimizing energy structure and improving energy utilization is also of great significance.

1 The role of HVAC and the effect
1.1 The role of HVAC
For indoor installation of air conditioning provide a comfortable working and living environment. Whose role includes control of air temperature, humidity, air speed and cleanliness and so on. In the normal comfort air conditioning in order to enable the body to maintain thermal balance and comfort to meet the as the goal, or at constant temperature and humidity requirements of the process of clean indoor air, mainly to meet the production technology as the standard.

1.2 HVAC on the human body
Since the gradual increase in airtight buildings, decoration quality are also increasing, leading to increased retention of indoor pollutants, and longer residence time. Such as smoke, bacteria, and from furniture, walls, carpets and paint emit oily a variety of pathogenic substances, coupled with the apparent lack of Ventilation, air circulation in indoor, indoor air quality a serious failure.

How can we effectively address the existing air-conditioned room, air quality problems, has attracted much attention. By a lot of ventilation to provide fresh air to the interior, is an effective measure to improve air quality. But it means an increase in new wind load. By adding new exhaust air flow and heat exchange can solve this problem, thereby reducing the operation of air conditioning energy consumption.

2 disadvantages of HVAC
Thermal Design in housing construction, in order to reach the room with a comfortable micro-climate, you need the proper use of housing characteristics of the thermal envelope to withstand outdoor climate change. In addition, there are planning and design, solar radiation , air temperature and humidity, and several other aspects.

2.1 The role of envelope
Building envelope, including external structure and inner envelope. External structure, including roof, walls and windows, etc.; the envelope means the interior floor, ceiling, inside walls and so on. In the north of heating buildings, building envelope The total heat loss of a large proportion of heat loss, such as the Beijing area, the heat loss through the envelope of the total heat loss of 77%, in the Shenyang region, accounting for 65%. Thus, to improve the building envelope the thermal performance of HVAC energy has a very important role.

2.2 The role of planning and design
Planning and design of buildings is an important building energy design guidance, planning needs to address energy efficiency design options, function zoning, building and road layout to, building orientation, shape, spacing, particularly in winter seasonal prevailing wind, solar radiation, building exterior space environment and other aspects of the layout. the main building for the optimization of micro-climate and environment, focusing on considerations favor energy conservation, solar and winter full attention to the dominant wind direction, terrain's natural advantages. energy planning is to analyze an environmental determinants of micro-climate, the radiation factors, environmental factors and geographical factors of the atmosphere of different factors, by the architect of the plan layout, careful analysis, the full demonstration, use and transformation of disadvantage into advantage, to form a good, microclimate conducive to energy conservation. Links to free Paper Downloads http://www.hi138.com 3 energy-saving design of HVAC
Energy-saving air-conditioning system design must be based on project specific circumstances, a full range of air conditioning season, the whole process of analysis to identify a suitable solution, the air conditioning system at different indoor and outdoor climate parameters or conditions can be economical, reasonable, normal operation.


3.1 Source of hot and cold with a reasonable
Devices in the system design is a reasonable selection of the key factors of air conditioning energy conservation, the rational allocation of hot and cold central air conditioning systems and energy sources on the rational use of energy-saving relationship important. Central air-conditioning system commonly used in cold and heat source configuration plus boiler with water-cooled chiller , heat pump unit and the Australian unit of Keng absorption. For example: Long Keng units of energy efficiency (cooling capacity / consumption of calories) is relatively low, but not saving power, for where there is waste heat and waste heat, such as thermal power plant and other nearby.

3.2 The use of thermal storage system
Uneven economic development of the region, but there are varying degrees difference between peak power load of the larger reality, the peak electricity power supply, and in low excess supply electricity wasted time. In the implementation of TOU power areas can take low-price periods of ice storage system to store the water into ice cold, high-price periods and then releasing cold out, this would shift the peak power load of the work plays a valley fill good results, and can produce better economic and social benefits.

3.3 Applications using frequency
Inverter air-conditioning systems in use now become a necessity, not only can effectively transform the lack of air conditioning systems in some, but also a larger reduction in energy consumption and operating cost savings. Adopt inverter technology because:
3.3.1 designers during the equipment selection, it is usually reserved for a certain amount of wealth, in fact, very few devices will be run under full load, or even impossible to run full load conditions.

3.3.2 the use of the building changes in the environment, the load will also change accordingly.

3.3.3 The actual load of the building will change with the outdoor climate fluctuations. Normally, air-conditioning equipment can only be rated by the equipment running. When the load decreases, the device is still full load rated power output operation. This will inevitably lead to waste of energy. If you use the inverter technology, the output power of the air conditioning equipment, increase or decrease as the load changes, it will play a significant energy savings. According to the air conditioning load conditions, changes in water flow or air flow can effectively energy savings. Variable Air Volume (VAV) air conditioning system by the end of the indoor unit to compensate for changes in the load, adjust the indoor air flow to maintain the room temperature. Change water system (fan coil) is controlled by means of water to regulate temperature. by water, air volume and frequency control host regulation, can be achieved when the required match with the air conditioning load, to achieve energy saving.

4 renewable energy in HVAC Applications
Has abundant resources of renewable energy, no pollution, clean, safe, inexhaustible renewable resource advantages, the growing shortage of energy today, as far as possible the use of renewable energy sources is necessary. Renewable energy in HVAC Applications in the following ways:
a) use of solar energy
b) the use of natural wind
c) the use of groundwater
d) the use of the soil can
e) the use of wind and ocean energy
Conclusion
Through this analysis, environment protection and energy technology in the HVAC field Applications are expanding and popular, and air conditioning energy consumption is enormous, from the design, operational aspects to consider energy conservation, improving the overall level of energy-saving air-conditioning system. To save energy, protect environment, environment, necessary to adopt various energy-saving measures to reduce energy consumption and air conditioning system cost. as long as HVAC professionals through the tireless efforts of energy saving air-conditioning systems will eventually make a useful contribution to society. Links to Research Papers Download http://www.hi138.com