How much btu would it take to a building of 2700m3 to 20 degree c using a oil fired boiler and what is the amount of c02 emitted from the burning of the fuel2 AnswersEngineering8 years ago
how much lpg would the average stove used for cooking on average, cooking three meals per day and the co2 emis?
how much lpg would the average stove used for cooking on average, cooking three meals per day and the co2 emissions from the gas burnt cooking
how much energy would it take to power 10 x 4ft radiators from a oil powered boiler and what would be the co2?
how much energy would it take to power 10 x 4ft radiators from a oil powered boiler and what would be the co2 emissions from the boiler. the heating would be on for 8 hours per day 240 days per year1 AnswerEngineering8 years ago
how much energy would it take to power 11 x 36 watt 4ft flourescent lights and what would the co2 emissions be from the energy used
Under normal operating conditions, and in adequate light, a particular
type of photovoltaic solar cell maintains a voltage of about 0.5 V. How
many of these would be needed to supply 10 V, and how should they be
(b) The active area of each of the above cells is 120 mm by 145 mm.
Calculate its output power when it is exposed to a light intensity of
1000 W m−2 and operating with an efficiency of 12%.
(c) Describe how a number of these cells could be connected to provide a
10 V supply delivering about 200 W when exposed to the above light
The south-facing wall of a house has a window and glass doors with a total
glazed area of 4 square metres, all single-glazing with a U-value of
6.0 W m
(a) During a particular 24-hour period, the average outdoor temperature is
6.6 °C and the indoor temperature is maintained at 20.5 °C. Calculate
the heat loss through the glazed area during this period, in kilowatthours.
If there is a solar gain of 0.60 kWh per square metre of glazing during
the above period, what is the net heat loss, in kilowatt-hours, for the
(b) Suppose that all the glazing is replaced by triple glazing, with a U-value
of 1.5 W m
–1, but a slightly lower solar gain of 0.50 kWh per
square metre. Show that this change should reduce the net heat loss for
the above period to almost zero
(c) Explain why the result in (b) should not be taken to mean that no
heating will be needed during this 24-hour period2 AnswersEngineering8 years ago
The annual lighting requirement of a certain household is 5.6 million
lumen-hours per year. Suppose that three-quarters of the existing light
bulbs with efficacy of 14 lumens per watt are replaced by compact
fluorescent lamps (CFLs). As a result, three-quarters of the lighting
requirement is now met by CFLs and only a quarter by GLS lamps. If
the average efficacy of the CFLs is 70 lumens per watt, what is the new
annual electricity consumption for lighting?1 AnswerPhysics9 years ago
reservoir surface area is 1.8 km by 2.0 km its surface how much water need to raise level by 2 meters?
if the reservoir surface area is 1.8 km by 2.0 km its surface
level will rise by nearly 2 metres how many cubic meters of water required to rise level by 2 meters1 AnswerEngineering9 years ago
If a reservoir is 250 metres above the intake, how many cubic metres
of water can be raised to it during the night? You may assume that the
density of water is 1000 kg m–3 and the acceleration due to gravity, g, is
10 m s–2.1 AnswerMathematics9 years ago
World total electricity consumption in 2010 was estimated to be 18 000
Given that world population is thought to have reached about 6.9 billion (6900 million) people in 2010, calculate the average per capita annual electricity consumption, in kWh per year.2 AnswersGeography9 years ago
- 1 AnswerEngineering9 years ago