It is often stated that the refrigerator door should be opened as few times as possible...

It is often stated that the refrigerator door should be opened as few times as possible for the shortest duration of time to save energy. Consider a household refrigerator that have an average internal temperature of 4o C. Assume that one-third of the refrigerated space is occupied by food items, and the remaining is filled with air. Given that the moisture contents of the air in the kitchen and the refrigerator are 0.010 and 0.004 kg per kg of air, respectively, and thus 0.006 kg of water vapor is condensed and removed for each kg of air that enters. The refrigerator door is opened an average of 30 times a day, and each time half of the air volume in the refrigerator is replaced by the warmer kitchen air. The refrigerator has a coefficient of performance of 1.5 and the cost of electricity is RM0.218/kWh in Malaysia.

Design the interior volume of the refrigerator and assume the average temperature and pressure in the kitchen. From your design, assumptions and the information given above, determine the cost of the energy wasted per year as a result of opening the refrigerator door.

Explain the changes on your results if the kitchen air were very dry and thus a negligible amount of water vapor condensed in the refrigerator.

Expert Solution

Please give some positive rating if you understood the answer thank you.... :-)

samet mamat answered 1 year ago

A new refrigerator is being designed. Magnets will be used to hold the door closed, and...

A new refrigerator is being designed. Magnets will be used to hold the door closed, and the rubber seal thickness can be selected to adjust the separation between the magnets (and therefore the force). The total length of rubber seal required to go around the door is 6m, and the cost of rubber seal is given equation 2. The pull force when opening the door should be 12N. Determine which of the magnet combinations should be used, and the combined...

Often times, we are not told to use a mean or a proportion, but we should...

Often times, we are not told to use a mean or a proportion, but we should know which is the best method for measuring our data. Explain, what type of data would it be most appropriate to use a mean and what type of data would it be most appropriate to use a proportion?

To carry the Energy Star Logo, a 25 cubic-foot French-door refrigerator must use no more than...

To carry the Energy Star Logo, a 25 cubic-foot French-door refrigerator must use no more than 574 kW-h/year (ignore the weird units). If they use significantly more than that, they are removed from the list (which recently happened). A sample of 23 refrrigerators o fac ertain modle is tested by an independent company. They are found to use an average of 596 kW-h/year, with a sample standard deviation of 18.7 kW-h/year. a) Write the hypotheses being tested. b) Give a...

. It is often stated that "we live in an information age," yet the adverse selection...

. It is often stated that "we live in an information age," yet the adverse selection problem still exists. Why? 4. Which government regulatory agency was created in great part, to help overcome the adverse selection problem in equity markets? 5. High deductible are used in which financial market to help address the moral hazard problem?

It is often stated for share market investing that a good company makes a good investment....

It is often stated for share market investing that a good company makes a good investment. We may define a good company as one that has experienced rapid growth (in sales, earnings or dividends) in the recent past. Required: a) Discuss some of the reasons why shares of good companies may or may not turn out to be good investments. b) As a basis for investing in shares, investors often look at (recent) past share prices and are more encouraged...

Politicians are often blamed when the economy is shrinking. If a politician stated, "We are going...

Politicians are often blamed when the economy is shrinking. If a politician stated, "We are going to keep trying things until we find something that works," is that a good idea or strategy for the economy? for the politician? Why or why not?

1. A number of frozen yogurt stores have opened in the last few years and your...

1. A number of frozen yogurt stores have opened in the last few years and your client, YogurtLand, has experienced a noticeable decline in customer traffic over the past several months that has caused you to have substantial doubt about YogurtLand’s ability to continue as a going concern. 2. Intelligis Electronics is a manufacturer of advanced electrical components. During the year, changes in the market resulted in a significant decrease in the demand for their products, which are now being...

An entrepreneur opened a small hardware store in a street mall. During the first few weeks,...

An entrepreneur opened a small hardware store in a street mall. During the first few weeks, business was slow with the store averaging only one customer arrived every 20 minutes. Assume that the random arrival of customers is Poisson distributed. (a) What is the probability that exactly 5 customers arrive during one-hour period? (b) If the average revenue from each customer is MYR 12, what is the probability that the entrepreneur’s hourly earnings are at least MYR 24? (c) If...

An entrepreneur opened a small hardware store in a strip mall. During the first few weeks,...

An entrepreneur opened a small hardware store in a strip mall. During the first few weeks, business was slow, with the store averaging only one customer every 20 minutes in the morning. Assume that the random arrival of customers is Poisson distributed. (a) What is the probability that at least 1 hour would elapse between customers? (b) What is the probability that 10 to 30 minutes would elapse between customers? (c) What is the probability that less than 5 minutes...

Taft Corporation operates primarily in the United States. However, a few years ago, it opened a...

Taft Corporation operates primarily in the United States. However, a few years ago, it opened a plant in Spain to produce merchandise to sell there. This foreign operation has been so successful that during the past 24 months the company started a manufacturing plant in Italy and another in Greece. Financial information for each of these facilities follows: Spain Italy Greece Sales $ 213,000 $ 636,000 $ 486,000 Intersegment transfers 0 102,400 96,000 Operating expenses 208,000 242,000 226,000 Interest expense...

Question