Asolar water heater consists of a flat plate collector that is coupled to a storage tank. the collector system is as shown in pr.9.100 in the textbook, page 615. consider a collector that is 1.5 m high and 3 m wide solar collector, the back side of the collector is insulated. the absorber plate and the glass cover are spaced 5 cm from each other, are maintained at temperature of 80°c and 40°c, respectively: a) draw the schematic of the system. b) determine rate of heat transfer by convection from the absorber plate for bl ) vertical solar collector at-90° b2) tilted solar collector at t -35 b3) tilted solar collector at t-4 b4) write your comments it is recommended to construct an excel program to solve pr.5 pr.6 (30 points) a house roof (5m x 5m), inclined at an angle of 27o to the horizontal, and has an outside surface temperature of 30°c while the outside air is at 40°c: a) draw the schematic of the system. bcalculate the heat transfer coefficient between the roof

The answer to your question really depends on three things: how much water you have, how cold it is to start out, and how cold the things around it are. water actually freezes when it gets to 32 degrees fahrenheit (0 degrees celsius), but the time it takes to get there may be different.  let's start with the first. if you take two glasses, and fill one with a tiny bit of water, and the other about halfway, then put them both in the freezer, the one with less water will freeze first (you can try this at home, but i recommend using plastic cups and not glass ones).  now let's move on to the second part. let's say you have two glasses, and you fill one with really cold water that has been in the refrigerator, and the other with really hot water from the sink. if you put both of them in the freezer, the one that started out colder will freeze first.  for the third part, let's imagine that you have two glasses with the same amount of water in them, and the water is at the same temperature. imagine putting one outside on a really really cold day in georgia, and having a friend in alaska put one outside on the same day. since it would be so much colder in alaska, the glass of water there would freeze before yours.  so, if you took a tiny bit of really cold water in a glass, and put it outside on a cold day in alaska, it would freeze a lot faster than a big glass of hot water outside on a cold day in georgia. 

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