This did not turn out well. Danfoss has terrible engineering support. After this long delay, on my 4th phone call I was told that piston sizing is proprietary information, and maybe sales could help me. I started with sales. Next time I'll use Sporlan.
So now I have a problem. I need to...
My heatpump will run at three operating points. After adjusting with correction factors for evaporator temperature and pressure drop to match Sporlan components, these operating points are 2.0, 3.4, and 4.8 tons cooling. The balanced port TEV that I would like to use doesn't have this range...
I've been waiting on the Danfoss applications engineers for a week and a half to obtain a piston sizing chart for Chatleff pistons. I don't know why they don't just post it on their web site like Sporlan does.
Does anyone have a Chatleff piston sizing chart?
I've sized a water/refrigerant shell and tube heat exchanger. I need some practical advice how to configure the tube and baffle pattern. Here is a 3d model of my design:
The box is 14' x 3' x 7". The baffles for the water side are 16" apart, and 7 inches high. I choose this spacing based on...
For a heatpump project, I need to control the flow rate of hot water through a tube in tube desuperheater. Depending on the operating conditions, I need to regulate the hot water flow from 0.16 GPM to 1.5 GPM to heat it to 120°F. What are good ways to do this?
The problem I'm trying to solve is that to collect 25,000 BTU/hr from the creek, I need 175 sf of HX area, about 1400 ft of 3/8 copper tube. The pressure drop would be about 7 psi. This length seems excessive.
1. Hmm. I see what you are saying. At 0°F my suction pressure is half what it is at...
I'm extracting heat from a 37°F stream flowing at 220 gpm. I plan to use copper coils immersed in the open flow as an evaporator. Conventional wisdom suggests that I keep the evaporator temperature high enough to prevent icing. However, the limiting convection heat transfer coefficient is on the...
Thanks for helping me think through freezing dynamics in a pond. I wonder if a single oversized evaporator at the bottom could have enough surface area to extract latent heat for the entire heating season?
Eight inches of ice is typical. The spring water temperature and flow measurements...
In January, the average temperature is 24 F. I'm looking for solutions for the coldest parts of the winter.
What if my ice rink were more of a pond, with an upper and lower evaporator coil? The refrigerant would flow into the top coil first, freezing the top and creating an insulating...
Thanks for your advice, waross and Dave41A.
The application is residential heating. The heat pump will be located outside, as will the evaporator heat exchanger. I conceived the antifreeze barrel idea to finely control the cooling of the spring water to create ice crystals but not freeze...
So when the wall of the pipe is the coldest part, ice will form there. Is there an ingenious way to conduct the heat out of the water but not through the wall of the pipe? Like injecting super-cooled air into the line, except simple.
Thanks, everyone for your thoughtful posts. I have gained an appreciation for the pernicious nature of ice dams.
In the system I outlined, I now suspect that any ice that formed inside the spring water pex coil at high flows would stick to the cold wall of the pex pipe and not be scrubbed...
I had hoped that someone had already solved this problem. Here's my design. Please help me refine it.
I've been designing a system to control ice formation, and maybe even capture some latent heat of freezing. I plan to use coils of tubing inside a barrel of antifreeze solution. The 40 F...
Is it possible to harness the latent heat of freezing in a heat pump?
I have a water source heat pump application. The water is 40 F. and limited in flow. Is there a way to freeze some ice crystals at the evaporator heat exchanger which could flow out the water source discharge, without...
