How do I calculate the cooling effect in Watts?

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Discussion Overview

The discussion revolves around calculating the total cooling effect in Watts of a system involving a heat pump and a cooling battery. Participants are sharing various data points related to the system's components, including temperatures, flow rates, and capacities, while seeking clarification on terms and system configuration.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Exploratory

Main Points Raised

  • One participant inquires about additional data needed to approximate the cooling effect, suggesting that specific flow rates and temperatures through the system are relevant.
  • Another participant clarifies that "THR" stands for Thermal Heat Rejection and describes the cooling battery as a cooling element in an air handling unit, questioning the flow direction and configuration of the system.
  • Participants discuss the flow rates and temperatures associated with the heat pump and cooling battery, with one providing specific values for the evaporator and cooling element.
  • There is uncertainty regarding the configuration of the system, including the need for additional valves and the intended flow paths between components.
  • One participant expresses that the term "THR" might be awkward if it refers to the heat removed from the water, indicating a lack of consensus on terminology.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the configuration of the system or the implications of the data provided. Multiple competing views and uncertainties remain regarding the flow direction and the interpretation of terms used.

Contextual Notes

Limitations include unclear flow paths, potential missing assumptions about system configuration, and unresolved questions about the adequacy of the provided data for calculating the cooling effect.

TSN79
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Shown in the attachment is a system consisting of a heat pump and other components. My question is how I can approximate the total cooling effect in Watts available to the cooling battery. I know that the ground water is about 5 degrees, and I have some other data as well, just shout as I'm not sure what's relevant. The heat pump has a THR value of 154 kW.
 

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what other data do you have ?

Rick
 
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Thx for answering,
I've got all kinds of data for the heat pump itself. The evaporator is designed for temperatures of 5 C in and 0,5 C out at a flow rate of 6,2 l/s. The cooling battery is designed for temperatures 7/12 C. Does that help?
 
What does "THR" stand for?

I assume "cooling battery" is some kind of thermal storage? What kind?

Do you know your flow rate and temps through that loop that includes your three components? How is the flow meant to go through that loop? With the cooling battery and heat pump in parallel and a 3-way valve in there as well, I suppose you are going to manually balance the flows to each?

Is the cooling battery supposed to receive chilled water from the heat pump? I'm not sure the flow is in the right direction...but flows aren't labeled on that side.

It just isn't very clear to me what the intention is there.
 
THR = Thermal Heat Rejection

With "cooling battery" I mean a cooling element in an air handling unit, i.e. a mesh of pipe with chilled water flowing through it which cools the air as it passes over the mesh. The return from the heat pump's evaporator is supposed to feed the cooling element on the way back to the heat exchanger, although I may need some more valves to make that work properly. The data sheet for the cooling element says 3,87 l/s to produce 72 kW. That's all I know about the cooling element.
 
Do you have more data on the heat pump? Like heating capacity and input power?

I suppose THR would be how much heat is removed from the water, but that's a little awkward of a term if that is the case. Anyway, if that's what that is, that number is your answer.
 
I've attached my data sheet for the heat pump. Hope that helps. Really appreciate your help!
 

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