An exercise room has 6 weight-lifting machines that have no motors and 7 treadmills each equipped with a 2.5-hp (shaft output) motor. The motors operate at an average load factor of 0.7, at which their efficiency is 0.77. During peak evening hours, all 12 pieces of exercising equipment are used continuously, and there are also two people doing light exercises while waiting in line for one piece of the equipment. Assuming the average rate of heat dissipation from people in an exercise room is 600 W, determine the rate of heat gain of the exercise room from people and the equipment at peak load conditions.

If the LHV of wood logs is 16 MJ/kg, how much energy is available for 2 kg of wood logs? If I burn all wood logs, what is the maximum energy in the heat I could obtain? If 30% of heat can be changed to electricity, how much electricity will be generated? If the heating value (LHV) of dry wood is 20 MJ/kg, what is the maximum energy 20 tonnes of wood could provide? If 60 % of the heat in wood could be transferred, how much heat can be transferred? If the heating value of coal is 40 MJ/kg, how much energy is available for 10 tonnes of coal? If I burn wood logs (LHV =16 MJ) to obtain the same amount of heat, how much (in tonne) of wood logs do I need to burn?

What types of energy are consumed in Texas? How is this energy used?

If the price of electricity is $0.11/kWh, determine the amount of energy and money that will be saved as a result of installing motion sensors. Also, determine the simple payback period if the purchase price of the sensor is $32 and it takes 1 h to install it at a cost of $40.