Ron and all: Refrigeration systems can not have compression release because it is a complete sealed system. and including a internal release valve may generate a "freezing" condition What could have is two pressure detectors than when showing equal value, the compressor is allowed to operate. Normally, the compressor MAY have a timer to allow the pressure to equalize between both chambers -- allowing enough time for the orifice to evaporate the gas -- normally -- the compressor is stopped but the internal fan continues working to remove the "cold energy" from the evaporator coil, otherwise a frozen evaporator coil is covered with ice affecting the over all performance.
Freezer and Refrigerators may have a periodic "defrost" cycle with a heater to make sure that the evaporator coil does not cover with ice that may reduce the overall system to a stand still, without the Defrost automatic period a manual one may be needed periodically. With a water Turbine and an electric clutch including a small fly wheel one can start units up to about 2 or 3 HP if driven directly. Ideally, the Hydro system may have an Electric generator and a coupling to the compressor with a small circuit the momentarily removes most of the generator loads when the coupling to the compressor is activated (= electric clutch) and just few seconds (like 4 or 6) once the compressor is at full RPM the generator load is coupled again. Unhappily, the placement of the turbine may be troublesome when it is close to the refrigeration unit -- it may require a lot of water routing in and out. Many times the water turbine may need to be a some distance from where the refrigeration needs to be, so the refrigeration unit needs to have an electric motor for proper operation, so a new problem is at hand and it is the electric motor starting current. Regards Nando ----- Original Message ----- From: "davis ron" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, October 13, 2005 4:44 PM Subject: Re: [microhydro] Refrigeration compressor directly driven by Microhydro > > Dear Adrian, > > I think that it would be worthwhile to investigate > this possibility. > The questions of start up torque for the compressor > and a control system (if any) would have to be > addressed. I had no problem starting a small > compressor with my Watermotor model 90 with 18m meters > of head. The model 150 would have about twice as much > torque with the same head. But how would we be able to > know if it would start a 1.5--2.5 h.p. compressor? > What about a compression release like I had on a big > Stihl chainsaw? Do we have any refrigeration experts > around here? > > > > --- Adrian Banie Lasimbang <[EMAIL PROTECTED]> wrote: > >> Dear Ron, >> >> The concept for using micro hydro tubine to run >> directly refrigerator >> compressor is very interesting. we have two micro >> hydro system installed in >> the remote villages in Borneo both with 5 kw >> capacity and we are looking at >> improving the socio economic income of the >> communities. >> >> these communities are still active hunter gatherers, >> however thier main cash >> income is from selling fish and bush meat. currenly >> they are selling the >> fish and bush meat to middleman which offers very >> low price. the community >> have no choice but to sell this meat or fish because >> they have no place to >> keep it. so in order to get enough cash to send >> thier children to school, >> they have to fish and hunt more and this gives great >> presure to thier >> limited resources. >> >> we are thinking if someone can help us to design the >> freezer, we can build >> in the community so that they have more bargaining >> power or even marketing >> their fish and bush meat directly in the towns. >> would appriciate if you can >> help us to link with publications or interested >> party to help us with this >> >> Cheers >> >> Adrian Lasimbang >> Sabah, Borneo >> >> ----- Original Message ----- >> From: "davis ron" <[EMAIL PROTECTED]> >> To: <[email protected]> >> Sent: Saturday, October 08, 2005 8:05 PM >> Subject: Re: [microhydro] Re:> Refrigeration >> compressor directly driven by >> Microhydro >> >> >> > >> > > Refrigeration directly >> > > driven by microhydro turbines >> > > >> > > Microhydro turbines would be a practical means >> to >> > > directly drive mid-size refrigeration >> compressors >> > for >> > > walk-in refrigerators in remote areas, >> especially >> > > where there is no electricity. >> > > This would be a way to keep local food and >> produce >> > > fresh until it could be used or taken to market, >> > such >> > > as fish. It would also upgrade the local diet. >> > > It would mean that local people wouldn't have to >> eat >> > a >> > > whole cow a day or two after it is killed, as >> now >> > must >> > > be done in warmer areas. I think that from one >> to >> > 2.5 >> > > h.p. would be sufficient for this. >> > > A turbine has very high start-up torque--good >> for >> > > running compressors. The refrigeration box could >> be >> > a >> > > prefab made from styrofoam blocks with >> galvanized >> > > sheet metal glued on the outside, and assembled >> on >> > > site. >> > > Inside lights and an air circulation fan could >> be >> > run >> > > by electricity from a car alternator. >> > > I think that such a unit could go a long way >> toward >> > > making some rural areas more self reliant and >> > > improving diet. >> > > Anyone interested? >> > > >> > > Ron Davis, watermotor.net >> > >> > >> > >> > >> > __________________________________ >> > Yahoo! Music Unlimited >> > Access over 1 million songs. Try it free. >> > http://music.yahoo.com/unlimited/ >> > >> > >> > >> > >> > >> > Does your company feature in the microhydro >> business directory at >> http://microhydropower.net/directory ? If not, >> please register free of >> charge and be exposed to the microhydro community >> world wide! >> > >> > NOTE: The advertisements in this email are added >> by Yahoogroups who >> provides us with free email group services. The >> microhydro-group does not >> endorse products or support the advertisements in >> any way. >> > >> > More information on micro hydropower at >> http://microhydropower.net >> > >> > To unsubscribe: send empty message to >> [EMAIL PROTECTED] >> > Yahoo! Groups Links >> > >> > >> > >> > >> > >> > >> > >> >> >> >> > > > > > > __________________________________ > Yahoo! Mail - PC Magazine Editors' Choice 2005 > http://mail.yahoo.com > > > > > > Does your company feature in the microhydro business directory at > http://microhydropower.net/directory ? 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