Hello Wojciech,
I did the similar calculation for chillers+PV. As David wrote, power consumed by the heat pump is an output, as well as the power generated by the PV. If you subtract these two arrays (PV generated – HP consumed), the positive values are the overproduction of PV (which can be, for example, fed to the grid). Negative values represent the power that you need to purchase from the grid. To quantify the difference in running costs compare the PV+HP combination to the power consumption of the heat pump only, considering feed in tariffs (if there are any at your location) and electricity prices.
Best,
Milica
From: David BRADLEY [mailto:d.bradley@tess-inc.com]
Sent: 16 October 2012 17:18
To: Malik Wojciech
Cc: trnsys-users@cae.wisc.edu
Subject: Re: [TRNSYS-users] COP and power consumption of the Heat Pump with PV cells
Wojciech,
I am not familiar with Type401. However, there are a number of heat pump models in the TESS Libraries and they probably work about the same. The problem with the existing models from your point of view is that they take the entering conditions (of air and water) and they compute the power required by the heat pump. I am not aware of any heat pump models that take power available as an input. I think you might still be able to achieve your simulation however. You need to first find the threshold power above which the heat pump can run (perhaps this would be the rated power? perhaps it would be the lowest power listed in the performance data?) Run your PV array and whenever its output power is above the heat pump's minimum allowable power then run the heat pump. You can write an equation that will multiply the thermostat's heat/cool signal by the PV's "power available" signal.
Best,
David
On 10/10/2012 03:33, Malik Wojciech wrote:
Hello
Could anybody give the prompt how to simulate and which components must be used in Heat Pump system combined with the PV cells?
The main assumptions that I have made are: Type 401 combined with Type 94a and with the building Tpe56. It is possible that the PV will support power consumption of the Heat Pump?
As an result of this simulation I would like to achieve information about the COP (it depends of assumed parameters) and how the COP value varies depending on the season and the weather.
Also I would like to get information about the cost of this combination (PV+ HP) – how much money we can save using this combination.
Do you have any ideas or suggestions how can I started this simulation and which Types I should use?
I will appreciate any kind of help.
Sincerely
Wojciech
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