Land use | area per person (m ^{2}) |
percentage |
---|---|---|

– domestic buildings | 30 | 1.1 |

– domestic gardens | 114 | 4.3 |

– other buildings | 18 | 0.66 |

– roads | 60 | 2.2 |

– railways | 3.6 | 0.13 |

– paths | 2.9 | 0.11 |

– greenspace | 2335 | 87.5 |

– water | 69 | 2.6 |

– other land uses | 37 | 1.4 |

Total | 2670 | 100 |

1000 BTU per hour | = | 0.3 kW | = | 7 kWh/d |

1 horse power (1 hp or 1 cv or 1 ps) | = | 0.75 kW | = | 18 kWh/d |

1 kW | = | 24 kWh/d |

1 therm | = | 29.31 kWh |

1000 Btu | = | 0.2931 kWh |

1 MJ | = | 0.2778 kWh |

1 GJ | = | 277.8 kWh |

1 toe (ton of oil equivalent) | = | 11 630 kWh |

1 kcal | = | 1.163 × 10^{-3} kWh |

1 kWh | = | 0.03412 | 3412 | 3.6 | 86 × 10^{-6} |
859.7 |

therms | Btu | MJ | toe | kcal |

suffix “th” may be added to indicate that a quantity of energy is thermal

energy. The same suffixes can be added to amounts of energy. “My house

uses 2 kWh(e) of electricity per day.”

If we add a suffix “p” to a power, this indicates that it’s a “peak” power,

or capacity. For example, 10 m^{2} of panels might have a power of 1 kWp.

1 kWh/d = 1/24 kW.

1 toe/y = 1.33 kW.

Petrol comes out of a petrol pump at about half a litre per second. So

that’s 5 kWh per second, or 18 MW.

The power of a Formula One racing car is 560 kW.

UK electricity consumption is 17 kWh per day per person, or 42.5 GW

per UK.

“One ton” of air-conditioning = 3.5 kW.