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Re: [TRNSYS-users] Calculation of a gradient in Trnsys for control of heat pump

Toni,

 Type83 will compute the derivative of an input that you give it. Send your storage temperature to Type83 and watch the derivative; if it gets too small then you can increase the compressor speed. There is also a PID controller (Type23) whose gain constants you can tune to get your compressor to respond to the changing tank temperature.

kind regards,

 David


On 11/29/2022 08:55, Toni Calabrese via TRNSYS-users wrote:

Dear Trnsys users,

within a project we need to control the compressor speed of a heat pump for the heating of a thermal storage. The basic idea would be to adapt the compressor speed (from 0 to 100%) based on a gradient temperature (Tt2 – Tt1) in the storage. If the temperature of the storage is increasing too slowly, compressor speed needs to be increased and if the temperature is increasing too fast, compressor speed needs to be decreased. Which is the easiest way to implement this in Trnsys? Which Types could we use?

 

Thanks a lot and have a nice evening

 

Toni Calabrese, MSc.

Wissenschaftlicher Projektleiter

toni.calabrese@spf.ch | toni.calabrese@ost.ch

 

T +41 58 257 4827

 

SPF Institut für Solartechnik

OST – Ostschweizer Fachhochschule

Oberseestr. 10 | CH-8640 Rapperswil | Switzerland | www.spf.ch | www.ost.ch

 


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***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley@tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com