Geothermal energy usage and application scope-2|Heat pumps|heating pumps|geothermal ground heat pumps|source heat pumps|central heating pumps|heating air conditioning|water heater

Geothermal energy usage and application scope-2

In recent years, overseas to geothermal energy non-electric power use, is also the direct use, very takes seriously. Because carries on the geothermal power generation, the thermal efficiency is low, the temperature requests high. The so-called thermal efficiency is low. That is, as a result of the geothermy type’s difference, the steam turbine type difference which uses, the thermal efficiency generally only then 6.4~18.6%, the majority of quantity of heats consume in vain. The so-called temperature requests high, i.e., the use geothermal energy electricity generation, to the geothermal water or the steam temperature request, must generally in 150℃ above; Otherwise, will affect its efficiency seriously. But geothermal energy direct use, not only the energy loss must be much smaller, and is also much lower to geothermal water’s temperature request, may use from 15~180℃ such wide temperature range. In the complete geothermal resource, in this kind, the low temperature geothermal resource is very rich, far is much bigger than the high temperature geothermal resource. But, the geothermal energy direct use also has its limitation, because stands under load the hot medium – hot water transportation distance the restriction, generally speaking, the heat source is not suitable leaves is excessively far with hot cities or the residential area; Otherwise, invests many, loses in a big way, the efficiency is bad, cannot delimit.

At present the geothermal energy direct use development is very rapid, widely has applied in the industry processing, the civil heating and the air conditioning, takes a bath, the medical service, the agricultural greenhouse, the field irrigation, the soil warming, the aquaculture, poultry raising and so on each aspect, has received the good economical technical benefit, saved the energy. The geothermal energy direct use, the specification is low, needs the equipment also simpler. In direct use geothermy system, although sometimes because of the geothermal heat flow in salt and the silt content is very low, but may perform the direct use to the geothermy, but usually is pulls out with the pump the geothermal heat flow, turns the steam and the hydrothermal after the heat interchanger uses again. These systems are the simple, what uses is the conventional ready-made part. Including geothermal heat pump, ground source heat pump, house heating by geothermal energy.

In the geothermal energy direct use uses heat source temperature majority in 40℃ above. If using the heat pump technology, the temperature for 20℃ or is lower than 20℃ the hydrothermal source may also treat as one kind of heat source to use (e.g. American, Canadian, French, Sweden and other national procedure). Heat pump’s principle of work and the home use electric refrigerator are the same, but the electric refrigerator in fact loses the heat pump one way, but the geothermy heat pump may bidirectional transmit heat. The winter, it from Earth extraction quantity of heat, then provides to the housing or the building (heating pattern); Summer, it from the housing or the building extraction quantity of heat, then provides to the Earth gathers saves (air conditioning pattern). Which one kind of circulation no matter is, the water is the heating and gathers saves, has displayed an independent hot water heater complete or the part function. Because the electric current can only use for to transfer heat, cannot use for to produce the heat generation, therefore the heat pump might provide compared to the own consumption energy high 3~4 time of energies. It may use in the very wide Earth temperature range. In the US, heat pump system every year by 20% rate of rise development, moreover the future will also continue by two figure’s good rising momenta to develop. According to the American Energy Information Administrative bureau forecast that to 2030 the heat pump for the heating, the radiation and the water heating will provide reaches as high as the 68Mt oil equivalent the energy.