Temperature determination
Thread Content
The heat transfer oil, which exits the boiler at a temperature of 140 degrees, is pumped into the pipelines downstream using a heat pump. Is it generally assumed that there is a change in temperature in the pipelines before and after the pump? If it is necessary to calculate the heat loss through the pump, how can the temperature difference be estimated approximately? The heat transfer oil grade used is K300, with a specific heat of 2 KJ/kg·K
The heat loss of the pump is negligible compared to the heat contained in the heat transfer oil being transported; in other words, no temperature difference is considered to exist.
The temperature difference before and after the pump is generally not considered. If there are heat loss due to heat conduction in the oil pipeline, the operation of the pump will also add heat to the system.
The pump provides static head and dynamic head, and the portion of energy converted to heat during operation can also be ignored. The heat loss in the pipeline depends on factors such as the pipeline’s insulation, length, and ambient temperature, and is not influenced by the pump.
The portion that is converted into thermal energy is generally not taken into account; it is mainly the change in pressure that matters
In the thermal balance calculation of process streams, the heat loss due to pump operation is not taken into account.
A heat transfer oil furnace sends the heat transfer oil returning from the equipment into the oil furnace, from where it is sent to the equipment that needs to be heated. The furnace is equipped with pressure and differential pressure gauges for the oil entering and leaving the furnace, as well as automatic control for regulating the temperature of the oil exiting the furnace
Heat loss caused by the pump is rarely considered. Just insulation is enough