A hash function maps keys to small integers (buckets). An ideal hash function maps the keys to the integers in a random-like manner, so that bucket values are evenly distributed even if there are regularities in the input data. This process can be divided into two steps:1  Map the key to an integer. hash function maps keys to small integers (buckets). An ideal hash function maps the keys to the integers in a random-like manner, so that bucket values are evenly distributed even if there are regularities in the input data. This process can be divided into two steps:
Electrical energy consumption were measured as 0.001 kWh for 5 C, 4 C, and 3 oC and 0.003 kWh for 2 C, 0.006 kWh for 1 C, 0.001 kWh for -1oC, 0.109 kWh for -2oC and 0.120 kWh for -3 C. Mean. energy consumption of the compressor was 0.035 kWh/ oC for positive cold storage temperatures (from 5 C to 0oC) and 0.093.
Capital Costs. Currently, the cost of storing a kilowatt-hour in batteries is about $400. [5] Energy Secretary Steven Chu in 2010 claimed that using pumped water to store electricity would cost less than $100 per kilowatt-hour, much less than the $400 kilowatt-hour cost of batteries.apital Costs. Currently, the cost of storing a kilowatt-hour in batteries is about $400. [5] Energy Secretary Steven Chu in 2010 claimed that using pumped water to store electricity would cost less than $100 per kilowatt-hour, much less than the $400 kilowatt-hour cost of batteries.