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THE PORT PERRY STAR FARM & COUNTRY LIFE TUESDAY, APRIL 18, 1995 - 9 Warm and cold barns From Page 6 a: Desired temperature - 10 degrees C b: Desired temperature - 4 degrees C The ridge opening can consist of a series of chimneys, a continuous slot, or the new commercially available "Dome." For these costs estimates, the warm barn version has an insulation level of RSI 3.5 (R-20) in the walls and ceiling. As well, automatically controlled natural ventila- tion is assumed using sidewall panels with an insulation value of RSI 1.7 (R-10). The target temperature in the barn is 10 degrees C (48 degrees F). The modified-environment barn is insu- lated with 4 cm (1-1/2") of rigid foam insula- tion and covered with a plywood providing an insulation value of RSI 1.3 (R-8). A light- ly insulated curtain (RSI 0.7) is used over the sidewall openings for natural ventila- tion. The desired inside temperature was assumed to be 4 degrees C (39 degrees F). Using the meterological data for the Ottawa area, 21.3 kweh of energy per cow is necessary to keep a warm barn to 10 degrees C and keep the moisture level below 75 per cent RH during the winter. Using electricity cost as a basis, this trans- lates to: 21.3 kweh x $0.08/kweh - $1.77 per year for each cow place. The other option is to allow the tempera- ture to drop to 4 degrees C or 5 degrees C for the period of time when outside temper- atures get below -25 degrees C. By comparison, 34.7 kweh of energy per cow would be needed to maintain 4 degrees C inside the modified-environment barn. This signifies a cost of 34.7 kweh x $0.08 - $2.78 per cow for a typi- cal winter. The sidewall panels can be a non-insulat- ed plastic curtain supplemented with wind- breaks. However, about 100 watts of sup- plemental heat will need to be added for (W'S 4 WO I BE» WI 4 OUTSIDE TEMPERATURE. -- 20°C each cow, with sums up to $4.25 per cow per year of heating cost. With modified-environment barns, the RECOMMENDED INSULATION VALUE: RSI | -- RSI 2 (R6--R 11) * VERY LITILE RADIANT HEAT . |] * COOL. TEMPERATURE Aw! * MORE COMFORTABLE « ALMOST NO FROST inside temperature can drop to 1 degree C FIG. 1 MODIFIED ENVIRONMENT BARN IN SUMMER FIG. 3 MODIFIED ENVIRONMENT BARN IN WINTER when outside temperatures are close to -20 degrees C. However, freezing in the barn will occur if outside temperatures fall below -25 degrees C for extended periods. It is wise to install an adequate supplemental heating system in these situations. 5: ns The success of modified-environment hi barns depends on the addition of an automatic control system with LE J w 5 J J hia TE I I «uN a 'a 1 * HEATING OF METAL ROOF NO INSULATION « WARMER TEMPERATURE * CONDENSATION, DRIPPING WATER, FOG * RUSTING ME TAL * MANURE AND WATER FREEZING thermostats. Sizing of Supplemental Heater: The size of a supplemental heater should be selected FIG.2 COLD BARN IN SUMMER FIG. 4 COLD BARN IN WINTER based on the local design winter tempera- ture. The 100-cow warm barn used for Table 1f would require a heating capacity of 100 cows x 150 w/cow - 15,000 w or 15 kw (51,000 B.T.U./hr.). This heater size corresponds to a small propane furnace, or three electric heaters. If a fuel furnace is already used to heat the milking parlor, it is easy to leave it running to supply some heat for the barn or to add an extra duct to discharge heat over the holding area. In most parts of Western Ontario, warm barns should not need supplemental heat. In Northern Ontario, the heater size should be based on the supplement heat require- ment at -30 degrees C. For the 100-cow, modified-environment barn, the heater size should be determined as follows: 100 cows x 295 w/cow - 29.5 kW (100,000 B.U.U./hr.) If freezing is a concern, which it may be even in Western Ontario, a heater is highly recommended with modified-environment barns. Handles ® Wide, endless belts handle leaves and other material gently compared to old slat and chain systems. More nutrient-rich leaves make it to the bale with fewer ending up on the ground. ® Open throat design swallows big windrows fast. Easier starting with less downtime due to plugging. Less damage to hay, too. ® Fixed chamber design creates a dense shell that won't sag. ® Durable machine keeps working cutting after cutting, scason after season. Wide, seamless belts handle leaves carefully. ® Three models available: ® Ask about competitive financing Model Bale 4844 Ax 4 4845 4x5 4865 6x 5' plans through Agricredit Acceptance Company. 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