Abstract
The experience of operating geothermal thermal power plants shows that during the first 5 years, their economic performance deteriorates, because there is a change in the temperature field of the soil. It is also important to consider: seasonal cyclical changes in the heat load and possible reversal of the heat flow when switching from heating to air conditioning and vice versa. An option is considered, which, when the coolant fills the well, directly contacting the surface of the casing. During well operation, seasonal or technological changes in well load are taken into account. The well is operating in reverse mode. The conditions for calculation are determined by the alternation of the periods of turning on the heat pump with the cyclical periods of stopping, determined by the season. Research have shown that as a result of longterm operation of a geothermal well in a cyclic mode of thermal loading, there are changes of a temperature field of the rock surrounding a well, with effect of interference of thermal waves, leading to accumulation of heat. Based on the processing of the results obtained criterion equations for calculating the dimensionless temperature of the well at the time of completion of the cycle of heat supply or removal, as the corresponding largest temperature difference heat pump. The received equations allow to specify calculation of technical and economic indicators taking into account duration of geothermal well operation and its mode.
Highlights
Geothermal heat of the earth is one of the choices of the renewable energy sources
Experience in operating geothermal thermal power plants shows that during the first 5 years, their economic performance is deteriorating, because there is a change in the soil temperature field [2]
Taking into account these conditions, geothermal well is considered an accumulator of heat energy more than a means of obtaining heat energy of the earth, and the system design methodology should take into account the heat capacity of the ground and the heat flow of the earth
Summary
Geothermal heat of the earth is one of the choices of the renewable energy sources. The relevance of the topic is confirmed by many studies [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. High potential geothermal sources with temperatures of 300°C and more occupy only 10% of the land and are often located in the low population territories with highvolcanic and seismic activities. The rest of territories has only low potential sources of geothermal energy with temperatures 15÷20 C at depth of 50÷100 and average density of heat flow 50 mW/m2 [1]. The heat flow is reversed when switching from heating to air conditioning and vice versa Taking into account these conditions, geothermal well is considered an accumulator of heat energy more than a means of obtaining heat energy of the earth, and the system design methodology should take into account the heat capacity of the ground and the heat flow of the earth
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