Hvac Heat Load Calculation Xls
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#3) 'Replacing a compressor or condenser fan reduces the air flow through the HVAC system, resulting in less cooling. In addition, the fan operates at lower static pressure, which reduces the net air pressure capability of the unit. A reduced net pressure on the fan results in slower air flow. In order to maintain the same heat load, the HVAC system will require a greater rate of cooling.
#4) "Driving the outdoor unit or generator, at the same power draw as the return, is called a spot application. Driving them at the same power supply, but at different speeds, is called a modulating application. If a modulating outdoor unit is used, the capacity of the return air fan or blower must be increased to equal to that being supplied by the modulating unit. In this situation, driving the return fan or blower at a lower speed results in greater draw on the power supply.
#5) 'When an air conditioner uses more cooling power than it receives from the power supply, the air conditioner will begin to draw from the source, such as a gas furnace or domestic water heater. Therefore, the furnace or water heater will also have to work harder to supply heat to the room. To avoid this, and allow a continuous supply of electricity, and pressure, the power supply needs to be balanced. Instrumentation, like the AMP meter or combined instrumentation, can report the watt usage. For average, undulating loads, an average watt usage will be the amp draw, while peak wattage indicates the actual total capacity to supply the load. d2c66b5586