Examples of air source heat pump systems engineering and economic and technical analysis – heat pumps, air source, Review of the week – HVAC Industry
Introduction With economic development and energy constraints and environmental protection has become increasingly prominent in recent years, Shanghai's many hotels have implemented the "coal to gas (oil, electricity)," environmental policies, but created a bath hot water costs rise, the peak of our winter of Baoshan Hotel, the cost alone as much as 3 million yuan per day, how more and better utilization of natural energy, especially low-grade energy, prevent and reduce pollution, ease energy shortages has long been a subject of concern to people. Some hotel bath water to reduce the cost of installation of the vacuum tube solar hot water system, through the direct sunlight to heat, is to solve the problem of environmental protection, but also the corresponding periods of lower part of the cost of bathing water, but according to the Shanghai nearly three years of weather data shows that nearly half a year every year the city was cloudy and rainy days, the weather conditions or to rely on auxiliary heating tube heating, and electricity directly to heat water is more expensive than Boiler Also high (per tonne up to 40 temperature rise more than 30 yuan), and the need to provide a large enough roof area to install lighting, there are some limitations. Solar energy is inexhaustible human nature to give clean energy, full use of its services to the production of human life, that people had long desired. Air Source Heat Pump Hot water system is the ideal potential of the sun (air can) use one of the ways that end, our hotel general manager in the Peng and a group of decision-making under the leadership instruct the Department to protect the lead manager in the whole set up by the quarter Kin-ming, the Admiralty, Yu Ming Fat, Ye Guoliang, Zhang Bing and other engineering and technical personnel consisting of QC research team began the second half of 2004, exploration in this area.
1. Heat pump and heat pump works
Heat pump technology is the recent concern in the world of new energy technologies, now applied to reverse cycle air conditioners more. Many pump applications in daily life. Pump is an increased potential energy of the device, according to different uses have water pump, air pump, oil pump and so on. Pump is mainly to improve or increase the water level pressure; pump is to increase the pressure; pump is mainly used for oil supply systems and hydraulic equipment. People use the pump is a simple double injection pump. These pumps are directly exposed to the material for success.
"Hot" does not matter, but to widely exist in the nature of objects of various nature, these substances, we think that is hot vector, can be solid (eg metal), liquid (water) can also be a gas. Heat transfer methods are convection, conduction and radiation. "Hot" must carry and pass through the carrier, the main delivery of supports in different ways. As the name suggests is the heat pump heat pump device. Under the new dictionary definition of the international refrigeration, heat pump is Condenser Release heat to heat the cooling system. Heat pump works can be divided into vapor by compression, gas compression, steam jet, absorption type, electric type, semiconductor type, and electrochemical variety. The present application should be the most common vapor compression heat pump. Its work is primarily driven by the power Compressor So that heat pump in the compressor, heat exchangers, throttling device and other parts of the closed loop system composed of a cycle of working fluid state through the phase transition, the low-grade heat energy into high-grade heat. Low heat absorption refrigeration, high heat and heating cycles of circulation of the refrigerant has the dual effect of heating, air conditioning now used more.
Heat pump system works. Evaporator After absorbing heat, the refrigerant evaporation temperature low-pressure superheated gases generated in the compressor into high temperature and pressure by the adiabatic compression of gas condensate at constant pressure by the condenser for the low-temperature high-pressure liquid (heat of vaporization of release, while heating). Blood pressure of liquid refrigerant by throttling the low temperature low pressure liquid thermal insulation, and then into the evaporator, absorbing heat at constant pressure heat and evaporation into superheated steam to repeat the next cycle. Therefore, heat pump water heater using the heat released into the water, not directly generate electricity out of heat, but by heat pump water heater to heat transport into the water to go.
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