With a ground source heat pump, you'll have large initial capital costs to install the piles or slinky system. Why don't you consider an air source heat pump? The technology is more advanced and unless you have particularly low ambients in winter the running costs for air source heat pumps are...
The cell containing the units is a pull-down list, so you just click on the down arrow and the range of units appears for you to select from. If this feature isn't working, maybe you need to check that macros are enabled on your version of Excel.
Good luck...
I have written an Excel spreadsheet that calculates these values, and corrects the thermophyical values for differing glycol concentrations and temperatures.
Let me know if it helps.
Cooky
ps. the e-mail address in the program description has...
whenever fluid travels along a pipe, there will always be some pressure drop, albeit very low if the pipe is large enough.
Here's a pressure drop calculator I developed a couple of years ago, you may find it helpful.
http://mysite.wanadoo-members.co.uk/pressure_drop2/index.html
Good luck
Cooky
I opened this thread, intending to contribute my experiences of chiller COP to the discussion.
Instead, I was too distracted with the use of metric AND imperial units to create a ratio!!
Please use either metric OR imperial units (preferably metric).
Sorry for the rant, but I had to say...
How about energy conservation or waste minimization of plant and equipment. There is a huge scope within energy conservation for a MEng project, and it is very topical, especially with the increase in energy prices (especially here in the UK).
I have just completed my project for a MEng degree...
I can't comment on the specific chiller you mention. However, I can tell you that with chillers, you get what you pay for.
The lowest priced chiller will probably suffer with a greater number of breakdowns. The noise level may be higher, and the chiller COP will almost certainly be lower.
My...
Thanks your your advice Dan. We dropped the OPC server and wrote a Visual Basic program to poll the serial card directly. This works great and we have good reliable communication via the radio modems.
The tech support from the modem suppliers is very good...
Hi,
I am trying to communicate with a Lange SC100 controller using a Modbus protocol operating on RS485. I have established 'hard wired' communication with an OPC server running on a PC with Win XP.
Having established hard wired communication, I am now using a pair of X8200 wireless modems...
Hi Thor,
We have EXACTLY the same problem. Basically, the FP2000 cannot support ActiveX, and this is required by the ADO commands to connect to SQL.
The best solution we have found is to 'publish' the data over the local network, then you'll need to write & deploy another VI on the client...
Hi,
Here's my problem:
I am measuring the flow rate from a flow meter, the device gives me a 4 - 20mA signal which I am sending to a National Instruments controler. The flow meter is calibrated in kg/hr, and I need to convert the analogue signal into a totalized flow (kg).
I know this can be...
