Dear David,
Thank you very much for your previous reply.
I am hoping you can clarify some of my confusions with this source code(Type941). I have studied this Type941 source code carefully. From my understanding is the outlet fluid temperature is not calculated from the amount of heat contained in the air. The Capacity and Power is worked out completely depending on the Rated Catalog Performance using the hourly ambient temperature and temperature of the fluid. So why does the relative humidity require at all? Is it only used to calculate the inlet and the outlet air properties which is not going to affect the fluid temperature in any way?
As I understand from previous questions, the interpolation Rated Catalog Performance data could not be extrapolated from beyond the range provided? However, what would be the calculation (selection) if the inlet ambient temperature is 5oC and inlet water temperature is 27.5oC, how would the fraction capacity and power calculated out (decided)?
Thank you very much for your kind answer.
Zhe Li
From: David BRADLEY [mailto:d.bradley@tess-inc.com]
Sent: 19 April 2013 18:04
To: TRNSYS users mailing list at the Solar Energy Lab, UW-Madison
Cc: Zhe Li
Subject: Re: [TRNSYS-users] Question about a line in Type941 source code
Zhe,
lps_air is the volumetric flow rate of the air (in liters per second) and rho_air_dry_in is the density (in kg/m3) of the dry air at the heat pump inlet temperature.
Best,
David
On 4/19/2013 11:11, Zhe Li wrote:
Dear All,
Thank you for your time.
I am trying to understand how TRNSYS calculates power output from this air-water heat pumps (Type941).
I am stuck in a line which I don’t know what the two terms are standing for?
! Determine the dry air mass flow rate
Flow_air = lps_air*3.6*rho_air_dry_in
Could somebody let me know what are the lps_air and rho_air_dry_in standing for?
I hope I did not break TRNSYS source code rule by asking this question.
Thank you for your help in advance.
Zhe Li
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