Why is the hp of a diesel engine rated only half that of an electric engine to power a hydraulic pump?

You need a 20hp diesel engine to power a hydraulic motor, while a 10-hp electric motor will do the same job.

the reason for this is that the internal combustion engine has a pronounced lack of flexibility in its torque band. in practice this tends to be less of an issue with diesels since they have to breath very well at high speeds as well as starting speeds but the torque is inconsistent none the less. electric motors often have limited torque at certain speeds as well but its not as big of an issue most often. there is also the matter of loss of power due to higher air temperature and altitude. the rule is usually to use an engine that will put out enough power even at almost 10000 ft in warm weather. also there is the fact that power will be lost as the engine wears out. but i must say i would guess that a 15hp diesel would do the job of a 10 hp motor ok im not sure why 20 is needed. its good to have extra though.

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Some Tips for Doing a Heat Pump Comparison

 

With advancements in technology, heat pumps are much more efficient these days than they were a few years ago. These new technologies have allowed the devices to recover heat better at colder temperatures. Most brands operate better now but still it is wise to do a heat pump comparison before making this major purchase.

The technological advancements have allowed these devices to be able to heat water for such uses as radiant floor heating, domestic water usage and multiple-zone forced air systems.

Purchasing a heat pump is a major investment as these units are not cheap. It will require quite a bit of research on the homeowners part. We can provide some basic heat pump comparison information to help you along the way. All heat pumps feature two specific ratings. The two ratings are the SEER (Seasonal Energy Efficiency Rating) and the HSPF (Heating Seasonal Performance Factor).

The SEER rating rates the cooling efficiency of the unit, the HSPF rating rates the heating ability of the unit. These are two main factors to consider when performing a heat pump comparison. The higher the rating, the more efficient the device is. One important point to note is that just because the unit has a high SEER rating, does not mean it will have a high HSPF rating.

Here is a good tip to keep in mind when doing a heat pump comparison. What will be your main usage of the heat pump? If the main usage is t o cool your home because you live in warm climate then focus on a pump that has a high SEER rating. If you live in an area that requires more heating than cooling, then focus on a heat pump that features a high HSPF rating.

A conventional heat pump has some standard features that are found on most makes and models. Most are much more energy efficient than normal types of heating. The standard conventional heat pump is cheaper than the newer Inverter heat pumps. If doing a heat pump comparison, make sure you compare conventional styles to conventional styles and inverter types to other inverter types. If you like you can compare conventional to inverter, just keep in mind the newer inverter types are more expensive.

Inverter heat pumps are new to the market and because of their sophisticated control features; you can have closer temperature control than the conventional style pumps. When doing a heat pump comparison, you will find that the inverter heat pumps are more advanced but they cost quite a bit more.

About the Author

We provide information for the consumer on heat pump comparison along with information on different brands including Trane heat pumps as well as many other types of heat pumps.

By M. Applebaum

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