Paula is working out heating requirements for a large home with an extensive underground basement. what should she use as her quantity heat loss through below- grade basement walls at a depth of 6-7 feet with no insulation? A. 139.1 B. 12.22 C. 0.069 D. 4.19

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.