Introduction to Heat Pumps (including RETScreen case study)


Date & time: 
Fri, November 28, 2008 - 14:00
Duration / timezone: 

90 minutes / Central European Time (Brussels, Paris, Berlin)


Walter Hulshorst & Sergio Ferreira


This introductory webinar explains how a heat pump system works, what is the most suitable solution in your case and, if it makes sense, how to start planning and building your installation.

After a briefing presentation, a case study will be presented using the RETScreen analysis software.



Documents & links


Sergio Ferreira's picture

Questions discussed during the webinar:

  1. Walter says air-to-air heat pump is for mild climates. However in following slide he mentioned for purposes only in Southern Europe. I would like to know if air-to-air is also applicable to Northern part of Europe. Because of lower investment, compared to ground and water heat pumps. Could you comment on investment difference?
  2. Do you need to insulate the distribution system (Ducts)?
  3. Which are the best heat exchangers to use if both heating and cooling are to be used?
  4. Is there some info that would help me to calculate the heating and cooling load of my home?  For example, if I know how much oil is used in a season, can I then correlate that to my heat load in W/m2?
  5. Does RETScreen take into account solar gains? If yes, what is the manner of solar gains consideration?
  6. In a building of 30 appartments with collective heating and distribution of hot water to radiators, would it make sense to replace the existing boiler by a heat pump?
  7. Is a lake system suitable for Southern Europe?
  8. At what scale are heat pump installations most economic (de-centralized or centralized systems)?
  9. I live at the cost in the Sonoran Desert, summer temperatures can get in to 40°C, winter temperatures can drop to 10°C, can a ground heat pump be feasible for an apartments building?
  10. Does RETScreen allow for the effect of air temperature on the ASHP COP? In other words, if RETScreen provides the air temperature data for a location, can this be accounted for automaticall in RETScreen?
  11. In the case study you indicated efficiencies of the boilers in the base case, how did you arrive at that percentage?
  12. Are the heat exchangers the same when heating and when cooling?
  13. What about seawater heating and cooling pumps. Is it efficient and technically feasible?
  14. Comment : In Spain there is a new concept: Heat pump directly driven by an internal combustion engine using natural gas or LPG. Residual heat from gas engine is recovered  -> cogeneration added value. Using this technology allows building constructors to reduce the compulsory part of renewables in the building.
  15. Do you have an idea how to analyse the Ocean Loop?
  16. Is there a standard temperature difference that manufacturers use when expressing the COP of systems?
  17. What about air-water heat pump, heat emitted into the house using a low temperature system such as underfloor heating?
  18. What about borehole water heat pumps?
By Sergio Ferreira 08/12/2008
Log in to post comments

Follow us