This article explores the new macro designer and other new macro features available in Access 2010. After reading this article, you will be able to take full advantage of what Access 2010 macros have to offer.
Rules For Sizing Your Heat Pump Pool Heater. 1  Size at 4 BTUâs per gallon or 1 BTU per litre of water. To heat in normal summer conditions when ambient air temperature average 70Â°F in a 24 hour period.  Size at 5 BTUâs per gallon or 1.3 to 1.5 BTUâs per litre of water.
The science behind pool temperatures: To raise the temperature of one gallon of water by one degree Fahrenheit requires 2,100 calories or 8.33 BTUâs. To cool a gallon by one degree requires getting rid of the same amount. Therefore to raise the temperature of a 10,000-gallon pool by 1F would equal 21,000,000 calories or 83,000 BTUâs. The same goes to lower each 10,000-gallons by 1F. The sun can increase the temperature of a pool by 3-4 degrees Fahrenheit on a sunny day. As the pool temperature reaches equilibrium (similar to surf temperature), the daily influence would be less. Heat pumps and chillers are rated by BTU/ hours so you can actually size a unit to provide proper cooling.