Examples of heat pump in the following topics:
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- A heat pump is a device that transfers heat energy from a heat source to a heat sink against a temperature gradient.
- Heat pumps, air conditioners, and refrigerators utilize heat transfer from cold to hot.
- Actually, a heat pump can be used both to heat and cool a space.
- We define a heat pump's coefficient of performance (COPhp) to be
- As with heat pumps, work input is required for heat transfer from cold to hot.
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- Pumps don't just push fluids, they can also direct pressurized air from one spot to another.
- Insulate pipes and heating equipment to reduce heat loss.
- Consider using industrial heat pumps (IHPs).
- IHPs use heat from heat producing processes to supplement other industrial heating processes or in preheating procedures.
- For more information about getting the most from pumps and pumping,visit www.plantservices.com.
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- As we learned in our Atom on "Heat Engines", all heat engines require heat transfer, achieved by providing (and maintaining) temperature difference between engine's heat source and heat sink.
- Water, with its high heat capacity, works extremely well as a coolant.
- Some may assume that by cooling the heated water, we can possibly fix the issue of thermal pollution.
- However, as we noted in our previous Atom on "Heat Pumps and Refrigerators", work required for the additional cooling leads to more heat exhaust into the environment.
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- Yet the RMI has no central heating system and its monthly energy bill amounts to around five dollars.
- Layers of super-efficient insulation, heat-recovering ventilators and insulated windows help keep the building and its occupants warm all winter long.
- Features built into the 5,946 m2 building include salvaged and recycled construction materials, wind and solar power sourcing, geo-exchange heating and cooling (heat pumps), active day lighting, a green roof, non-toxic low-emission wall coatings, and exterior storm water retention and treatment systems.
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- Conduction of heat is governed by another second-order partial differential equation, the heat equation .
- Visualization of heat transfer in a pump casing, created by solving the heat equation.
- Heat is being generated internally in the casing and being cooled at the boundary, providing a steady state temperature distribution.
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- Heat transfer, a less organized process, is driven by temperature differences.
- Nevertheless, heat and work can produce identical results.
- Both heat and work can cause a temperature increase.
- Heat transfer into a system, such as when the Sun warms the air in a bicycle tire, can increase its temperature, and so can work done on the system, as when the bicyclist pumps air into the tire.
- Internal energy is a form of energy completely different from either heat or work.
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- Then, we would evacuate all the air out of the bomb before pumping in pure oxygen gas (O2).
- The total heat given off in the reaction will be equal to the heat gained by the water and the calorimeter:
- Keep in mind that the heat gained by the calorimeter is the sum of the heat gained by the water, as well as the calorimeter itself.
- where Cwater denotes the specific heat capacity of the water ($1 \frac{cal}{g ^{\circ}C}$), and Ccal is the heat capacity of the calorimeter (typically in $\frac{cal}{^{\circ}C}$).
- From the change in temperature, the heat of reaction can be calculated.
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- The specific heat of air is a weighted average of the specific heats of nitrogen and oxygen, which is c=cp≅1000 J/kg⋅C (note that the specific heat at constant pressure must be used for this process).
- Instead heat diffusion in solids is called heat conduction, which we've just reviewed.
- An example of convection is a car engine kept cool by the flow of water in the cooling system, with the water pump maintaining a flow of cool water to the pistons.
- Heat is removed from the ocean when water evaporates.
- If the water vapor condenses in liquid droplets as clouds form, heat is released in the atmosphere (this heat release is latent heat) .
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- Unless quickly used to perform work, ATP spontaneously dissociates into ADP + Pi, and the free energy released during this process is lost as heat.
- For example, transmembrane ion pumps in nerve cells use the energy from ATP to pump ions across the cell membrane and generate an action potential.
- The sodium-potassium pump (Na+/K+ pump) drives sodium out of the cell and potassium into the cell .
- By donating free energy to the Na+/K+ pump, phosphorylation drives the endergonic reaction.
- Sodium-potassium pumps use the energy derived from exergonic ATP hydrolysis to pump sodium and potassium ions across the cell membrane.
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- Blood is circulated around the body through blood vessels by the pumping action of the heart .
- Blood is pumped from the left ventricle of the heart through arteries to peripheral tissues and returns to the right atrium of the heart through veins.
- It then enters the right ventricle and is pumped through the pulmonary artery to the lungs and returns to the left atrium through the pulmonary veins.
- When blood vessels constrict, the flow of blood is restricted or decreased, thus, retaining body heat or increasing vascular resistance.
- Cutaneously, this makes the skin turn paler because less blood reaches the surface, reducing the radiation of heat.