chilled water system: simultanous cooling and heating

[pumpmann]

hello everyone
what is the options available for simultaneous cooling and heating with heat pump and or heat recovery chilled water (say 25% cooling , 75% heating: for instance different zones, one part north facing, other south facing)?

how effective is temperature control compared to a 3 pipe VRF (heat recovery box system) ?

 

[tys90]

Oh man, those are loaded questions. I would suggest hiring an engineer.

 

[Drazen]

With 25% cooling 75% heating you obviously need additional heating, and given decision on temperature regime, yearly load pattern, careful analysis and calculation would be required to reach feasibility estimate.

Fir heat recovery VRF the same is to be applied. You need engineering calculations and analysis. In general, it can be proved worthwhile mostly in buildings where high internal loads exist year around, so internal zones need cooling all the time.

North-south differences, yes it can happen in some large hotels, but such places will have limitation on maximum allowed system refrigerant quantity that will directly mess with your desire to put all heat and cold into one bank. Water to water heat pumps are better solution for such instance.

 

[willard3]

Read forum policies and hire an Engineer.

http://www.eng-tips.com/faqs.cfm?fid=376