Select all the correct answers. Which two statements describe challenges faced by renewable energy sources?
Geothermal energy requires a great deal of land.
Development of wind energy is a threat to bats and birds.
Toxic chemicals are used in the manufacture of solar cells.
Most renewable energy sources produce greenhouse gas emissions.
Hydropower development has no impact on wildlife.

Aheat pump with refrigerant-134a as the working fluid is used to keep a space at 25°c by absorbing heat from geothermal water that enters the evaporator at 500c at a rate of 0.065 kg/s and leaves at 40°c. the refrigerant enters the evaporator at 20°c with a quality of 23 percent and leaves at the inlet pressure as saturated vapor. the refrigerant loses 300 w of heat to the surroundings as it flows through the compressor and the refrigerant leaves the compressor at 1.4 mpa at the same entropy as the inlet. determine: (a) the degrees of subcooling of the refrigerant in the condenser, b)-the mass flow rate of the refrigerant . (c) the heating load and the cop of the pump, and d)-the theoretical minimum power input to the compressor for the same heating load.