HVAC system on environment protection and energy technology development

[Abstract] energy-saving HVAC system is no longer an emerging problem. With modern way of life for people of diverse ideas and details of, the environmental requirements for buildings is increasing. Comfort and high quality living environment people in pursuit of the trend. In this paper, HVAC systems and environment protection and energy technology development and use of natural resources can be put forward some humble opinion.

[Paper Keywords] Green Energy Saving HVAC
20 years since the last century, began the rapid development of compression chillers, HVAC technology have been widely used in various public buildings and commercial buildings, indoor environment plays a guarantee to provide comfort and indoor air quality environment role. Looking abroad, the use of central air-conditioning more and more civil and industrial construction, its use marks a region of technology and economic development level, but also substantially improved from the management level of enterprises. However, with home and business air-conditioning the increasing use of the system, also produced a series of environmental problems.

1 HVAC significance and impact of existing
Manufacture of HVAC is to provide people with comfortable high quality of life and indoor living environment for heat production. Mainly on air temperature, humidity, air speed and the body itself and the surrounding environment such as walls and other buildings of the radiation heat exchange Q improve the average home air conditioning to maintain body heat balance to meet the needs of human sensory comfort, air-conditioning systems for large enterprises with production operations are required to provide constant temperature and humidity environment, to meet the production process requirements.

The same survey data, air-conditioning systems enable health also had a threat. Closed the building in recent years greatly increased, a variety of new ornaments and put into use, all this led to the increase in indoor pollutants. Using air-conditioning system the environment, the operating principles of air conditioning, indoor air recycling, a serious shortage of fresh air, air-conditioning system led to the use of indoor environmental pollutants far exceed the national safety standards.

Therefore, to effectively address the air conditioning system to the health and environmental problems of environmental technology in the HVAC system is very meaningful.

2, the application of various environmental and development of energy-saving technologies
2.1 The development and utilization of new energy and new technologies
a. The use of emerging green energy
(1) air conditioning equipment using natural gas as energy, natural gas, coal and oil, following the third largest after the conventional energy sources, to effectively control carbon dioxide and sulfur dioxide emissions, reducing environmental pollution, decrease harmful to human health. Using natural gas as energy The refrigeration and air conditioning market prospects.

(2) the use of renewable resources, such as ground source heat, water, solar, natural wind, ocean energy and other natural resources. Ground source heat pump is absorbed by the soil in the winter, groundwater, surface water and other natural resources, energy, provide heat to the building, the release of the summer heat to natural resources, to building an energy efficient cooling and air-conditioning system. is mainly used for residential buildings, villas, schools and commercial buildings. solar air conditioning using solar energy for cooling the radiation work. its use, make up the gap of insufficient power supply to ease the supply pressure, is also very environmentally friendly, will not bring the process of using conventional electric air conditioning brought about by the urban heat island effect, and because the principle of the use of solar energy air-conditioning does not include freon, will not produce harmful substances related to damage caused atmospheric environment. is truly a green energy-saving air conditioning.

China's vast land, found mainly in low temperature geothermal energy in most of the low temperature hot water resources suitable for direct use. And Tibet, Yunnan and Taiwan can be used as high temperature and high-temperature geothermal heat pump, heat pump sea water in coastal areas is also very bright future .


b new green energy technology
(1) thermal storage air conditioning, usually mainly use two kinds of ice and water media. Since many cities during the day and supply tight, in order to limit electricity, day and night, different levels of electric charge. Usually after the evening appointed, low price, can with cold air. Such conditioning is low during the night when electricity prices, open part of the refrigeration unit to ice, and total energy storage. in the daytime peak electricity price is more expensive, further melting of ice cold water to provide , the release of stored energy to deal with a lot of electricity demand, in such a way to reduce electricity costs. In addition to ice and water, but also by temperature phase change material of the storage media, such as eutectic salts. but imperfect technology and high production costs, this new technology is still in the Research stage. reposted elsewhere in the Research Papers Download http://www.hi138.com (2) heat recovery technology, is the discharge of air conditioning units the heat recovery ventilation system to prevent room air directly exhausted to the outside air, resulting in waste of energy. This technique can reduce the thermal pollution, heat recycling, also has been turning waste into effect.

(3) low-temperature radiant floor heating technology, is laid directly on the floor hot water heating pipes to the floor, the heat radiation from the ground to heat the indoor air. Use this method, commonly used hot water to do the media, radiation, surface temperature is not at 45 degrees Celsius. overshoot temperature radiant floor heating, the heat convection are the way to the top of the pass, resulting in higher than room temperature, to let people feel the feet warm while keeping head cool and comfortable. low temperature radiant floor heating , floor heating comfort and privacy not only good but also reduce head l, space saving, convenient measurement of transformation, all aspects of maintenance cost savings
2.2 The development of alternative refrigerants
As we all know, it used the refrigerant Freon great impact on the ozone layer. In order to protect the ozone layer, CFCs and refrigeration and air conditioning industry HCFCs are two alternative refrigerants were studied. Corresponding progress has been made. Synthetic refrigerants are HFCs, Natural refrigerants are NH3, C02, hydrocarbons. HFCs in the ODP value of 0 for the refrigeration and air conditioning system will not damage the ozone layer, thereby avoiding excessive ultraviolet radiation damage to humans, the Earth
c air-conditioning system of technological progress and prospects
1. New air pretreatment system consists of a new heat recovery systems, and desiccant air pretreatment new air pretreatment system. Pretreatment of fresh air heat recovery system can recover the exhaust energy of fresh air in the pretreatment system to reduce the cooling capacity and in addition some wet volume, reducing the system capacity for temperature, humidity, humidity control less stringent applications. desiccant to avoid a new cold air pretreatment system, and low offset the shortcomings of the machine leakage, reducing the cooling capacity to achieve the temperature and humidity independent control, convenient adjustment, high accuracy. renewable energy can take advantage of low grade industrial waste heat energy or energy-saving effect is remarkable and can be used wet load, high precision humidity control requirements of the occasion.

2. Ice storage air distribution system is the ice storage system and closely linked to cold air, ice storage technology will be combined with the cold air, significantly improve indoor air quality, effective energy saving. Ice storage system can reduce the cold air indoor relative humidity, people feel more comfortable, cool and dry.

3. DOAS referred to as DOAS, the new air unit using low temperature air supply unit, will be 100% fresh air directly to the air-conditioned room, taking on new wind load and the indoor all the latent heat load and part of the sensible heat load (or all of the air conditioning load). The sensible cooling equipment There was no return air system, can greatly increase the environmental safety of the building without causing pollution in different rooms spread: fresh air and exhaust air heat exchanger between the use of all that can reduce air conditioning energy consumption.

4. Personalized ventilation system so that everyone can control his own preferences where the local environment. Individual adjustment of the festival is a way of saving, environmentally friendly way of regulation, has broad application prospects.

5. Evaporative cooling system using water as an integrated air-conditioning refrigerant, to avoid the use of CFCs on the ozone layer and the leakage of the damage. Environmental value objective.

Conclusion
The development of HVAC systems derived from the construction industry, construction industry in recent years the rapid development of air-conditioning manufacturing to bring good development opportunities. In the HVAC manufacturing encourage the use of environmentally friendly energy-saving technology, the industry is related to the imperative of glory Road. continued Research and development of new environmentally friendly energy-saving technologies to ensure the HVAC system with the times. Links http://www.hi138.com Research Papers Download