Cooking needs to be included in the energy accumulation since some people cook multiple times each day. Hong Kong uses 200 V outlets which operate at about 2300 Watts. We know that Hong Kong uses, on average, 2760 MJ per day for cooking. This comes out to about 46 kWh per day per person. The cooking appliances are only on for short periods of time, so we will say for one hour put of the day each day. The amount of energy consumed while cooking can be estimated to be 1.9 kWh per day per person.
Washing both clothes and dishes generally requires hot water. A full loed of laundry uses about 21 gallons of water and about 1 kWh. To dry the same load of clothes will require about 3 kWh. Estimating that there will be a few dishes each day, and assuming that to do the dishes five gallons of water will need to be heated on average 200C, we can add up the energy and estimate it to be 10 kWh per day per person. Heating and cooling air uses more energy than any of the processes discussed to this point. McKay mentions in his book that humans need at least 12 kWh per day per person in our air. Since the people of Hong Kong like to live comfortably we can reasonably estimate that the total energy required to maintain an average temperature of 230C is 24 kWh per day per person. Cooling air to a desirable temperature is a necessity for a few of the summer months in Hong Kong. A window air conditioner in a single room uses 0.6 kWh of electricity and exchanges about 2.6 kW of cooling. We will assume that a person in Hong Kong will turn their air conditioner on for 12 hours a day two months out of the year. This puts the total energy needed up to 1.2 kWh per day per person. Refrigeration is not a huge part of the energy problem when compared to other sources. An average refrigerator/freezer combo uses about 18 kW. This comes out to about 1 kWh per day per person. When we sum all of these energy sources for heating and cooling we get a grand total of 42.9 kWh per day per person.
