10+ Vardan Survey Solutions Interview Questions and Answers

To convert a plus chiller to a minus chiller package, the refrigeration system needs to be modified to accommodate the change in temperature requirements.

• Modify the refrigeration system to allow for lower temperatures

• Adjust the settings and controls to operate at negative temperatures

• Install additional insulation to maintain lower temperatures

• Replace any components that are not rated for sub-zero temperatures

PIBCV valves are typically installed on the supply side of the chilled water system.

• PIBCV valves are installed on the supply side to control the flow of chilled water into the system.

• They are often located near the chillers or air handling units.

• PIBCV valves help regulate the temperature of the chilled water circulating in the system.

• These valves are crucial for maintaining the efficiency and performance of the chilled water system.

Grouting is the process of filling gaps or spaces between tiles or masonry with a cement-based material.

• Grouting helps to create a uniform and stable surface.

• It prevents water from seeping through gaps and causing damage.

• Grouting can be done with different types of materials such as cement, epoxy, or urethane.

• The process involves mixing the grout material with water to form a paste, applying it to the gaps, and then wiping away the excess.

• Grouting should be done carefully to ...read more

The inlet and outlet temperatures for both the evaporator and condenser depend on the ambient conditions prescribed by ISHRAE.

• Inlet and outlet temperatures for the evaporator and condenser will vary based on the ambient conditions specified by ISHRAE standards.

• For air-cooled systems, the inlet temperature for the evaporator is typically higher than the outlet temperature, while the opposite is true for the condenser.

• ISHRAE standards may provide specific temperature ranges for...read more

Chiller selection is based on various parameters such as cooling capacity, efficiency, size, noise level, and cost.

• Cooling capacity: Determine the required cooling capacity based on the size of the space and heat load.

• Efficiency: Look for energy-efficient models to reduce operating costs.

• Size: Consider the physical dimensions of the chiller to ensure it fits in the designated space.

• Noise level: Choose a chiller with low noise output, especially if it will be installed in a no...read more

Inverter changes speed based on load, while fixed speed operates at a constant speed.

• Inverter adjusts motor speed to match the required load, saving energy and reducing wear and tear.

• Fixed speed motors operate at a constant speed regardless of the load, leading to higher energy consumption.

• Inverter technology is commonly used in air conditioners and refrigerators for energy efficiency.

• Fixed speed motors are often found in basic household appliances like fans and pumps.

The MaX COP of VRF systems is typically higher than that of chillers.

• VRF systems generally have a higher COP (Coefficient of Performance) compared to chillers.

• VRF systems can achieve COP values of 4 or higher, while chillers typically have COP values around 2 to 3.

• The higher COP of VRF systems makes them more energy efficient and cost-effective in the long run.

Designing ODU VRF with AHU involves selecting compatible units, determining capacity requirements, and ensuring proper installation.

• Select compatible ODU VRF and AHU units based on capacity and efficiency requirements

• Calculate the total cooling and heating load of the space to determine the capacity needed

• Design the refrigerant piping and electrical connections between the ODU VRF and AHU

• Ensure proper ventilation and air distribution for optimal performance

• Consider factors su...read more

IK/TR stands for Installment Key/Total Receivables and NPLV stands for Net Present Loan Value.

• IK/TR is a financial metric used to calculate the ratio of total installment payments to total receivables.

• NPLV is a financial metric used to determine the net present value of a loan.

• IK/TR is important for assessing the repayment capacity of borrowers, while NPLV helps in evaluating the profitability of loans.

• Example: If a borrower has an IK/TR ratio of 0.8, it means they have paid ...read more

Pump HP is calculated using the formula: HP = (Q x H) / (3960 x Efficiency)

• HP = Horsepower of the pump

• Q = Flow rate of the pump in gallons per minute (GPM)

• H = Total head in feet

• Efficiency = Efficiency of the pump as a decimal

Refnets are calculated based on the number of referrals made by an individual.

• Refnets are typically calculated by counting the number of referrals made by an individual.

• The formula for calculating refnets may vary depending on the specific program or system being used.

• Refnets can be used to track the effectiveness of referral programs and the performance of individuals in generating referrals.