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Milk Ratios

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After heat from milk has been transferred to the coolant, the “used and warm” cooling water can be stored and re-used for watering cows and/or for cleaning. Sanford (2003a) points out that on farms with more than 500 cows, water storage tank can be avoided by having well water flowing through the pre-cooler and then directly to cow waterers. However, a variable speed milk pump is needed in order to regulate the milk flow rate to maintain a sufficient water to-milk ratio. A 1:1 1 ratio is able to achieve considerable amount of cooling, but ½:1 are very common in practice, though manufactures recommend ratios up to 3:1. The average daily water flow rate is estimated to be 1.9 gpm per 100 milking cows (Sanford, 2003a). Addition of a …show more content…

It is recommended the use of VS pumps on farms with limited water system flow rates (Sanford, 2003d). Moreover, many VS controllers contain“Milk” and “Wash” modes, so that milk pumps can operate at the lowest speed or full speed, respectively. In general, variable speed milk pumps are able to cool milk to an addition 15°F. b.) Refrigeration Heat Recovery (RHR) The basic purpose to heat water is for washing and cleaning. Refrigeration heat recovery (RHR) units remove heat from the refrigerant that would be lost into the air, and uses this captured heat to pre-heat water before it enters the water heater. RHR, shown in Figure 3.10, is able to reduce water heating energy requirements, once up to 50% of the energy require to heat water is captured from the refrigerant. As shown in Figure 3.11, a RHR unit contains a storage tank and a heat exchanger. In a common refrigeration system, a compressor pressurized the “hot” refrigerant into high pressure steam, so that a condenser cools and condense it to a high pressure liquid. However, with the RHR, the “hot” refrigerant gas is piped through the heat exchanger in the RHR and cooled,

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