Question

1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump extracts a flow of 86.7 m3/h of hot water from a geothermal resource with a gauge height of 75 m. The overall performance (electric motor-pump) is 0.75. The electrical power of the machine and its electrical consumption per 100 hours of operation is approximately: (water density 1,000 kg /m3) a) 21.2 kW; 2.12 MWh b) 28.5 kW; 2.85 MWh c) 23.6 kw; 2.36 MWh 1. 3. A geothermal heat pump with a rated thermal power of 100 kW presents a seasonal COP equal to 4 for the heating season and works during that season 2,000 hours equivalent to full load. Calculate the primary energy savings compared to a diesel boiler with seasonal yield 0.85. Other data Gas oil PCI 8560 kcal/L (10 MWh/ m3), density 850 kg /m3 Ratios of primary energy to final energy: Electricity: 0.2 tep/MWh electric; Diesel fuel: 0.957 tep/m3 gas oil a) 5 tep b) 25 tep c) 12.5 tep 1. 4. A high-enthalpy geothermal resource produces a flow rate of 2x105 kg /h of steam at 200 0C and 10 bar. An electric power plant has a specific consumption of this type of steam of 6 kg/ kWh electric. Indicate the power of the plant and the annual electricity production for an operating regime of 6,000 h/year at full load a) 33.3 MW; 200 Gwh /year b] 25 Mw; 150 Gwh )8.33 MW: so Gwh /year 1. 5. Indicate the power of a binary cycle of a geothermal resource of half enthalpy of temperature 120 oC and a flow rate of 10 m3 /h, using the approximate expression of Nichols a) 74 kw b) 47 kW c) 55 kw 1. 6. A heat pump heats a flow rate of 5 m3/ h of water from 20 0C to 45 0C, with a COP of 3.2. Indicate the approximate electrical power required by the heat pump (specific heat of water 4.19 kJ/kg 0C, water density: 1,000 kg /m3) a) 35.5 kW b)45.5 kw c) 40.5 kw 1. 7. A vertical heat exchanger (vertical probe) geothermal heat pump (BCG) must cover a heating load of 100 kW (building demand). BCG has a COP 4.5. The characteristics of the subsoil allow an extraction of 45 W /m (W per lineal meter of probe or linear meter of well), indicate the number of probes to install (number of perforations or wells), if each one of them has a length of 124 m. a) 14 probes b) 10 probes c) 18 probes 1.8. A buried horizontal geothermal exchanger allows an extraction of heat from the ground of 25 W /m2. Indicate the heating power that can be supplied to a building with a land area of 1 hectare (10,000 m2), if a COP 4 geothermal heat pump is used. a) 382 kW b) 355 kW c) 333 kw 1.9. To cover the heating and cooling demand of a building, a geothermal heat pump (BCG) is installed that can supply heat and cold. Annual electricity consumption of the BCG (heating+ cooling): 57.6 MWh/year Energy extracted from the subsoil during the heating season: 97.5 MWh .Seasonal COP (SCOP or HSPF) of the BCG for the heating season:4 From these data, the heat consumption of the building and electricity during the entire heating season will be approximately: a) 130 MWh, 32.5 MWh b) 150 MWh, 37.5 MWh c) 200 MWh, 50 MWh 1. 10. For exercise 9, if the seasonal ERR during the cooling season equals 5, then the cold produced during the entire cooling season and the heat injected into the subsoil during that period of time will be: a) 105.3 MWh, 126.4 MWhb) 142.5 MWh, 171 MWh c) 125.5 MWh, 150.6 MWh

Answer 1

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